feat(server-setup): replace nginx with caddy

Assisted-by: GLM 5.3 Flash

README.md

@@ -22,7 +22,7 @@ own builtins, and none of them needs a module installed beside it.
   automatic updates); `workstation-setup.pl` sets up a Fedora desktop (Brave, the
   official Go toolchain, Rust, GoLand, Flatpak applications, firewall, SELinux).
 - **Deployment**: `sglang-deploy.pl` puts an SGLang inference server on an AMD GPU
-  behind nginx with HTTPS and an API key, runs the engine from the project's ROCm
+  behind Caddy with HTTPS and an API key, runs the engine from the project's ROCm
   container image, and downloads the model weights from ModelScope.
 - **Maintenance**: `system-optimise.pl` removes old kernels (the running one and one
   fallback always stay), vacuums journals, clears temporary files and core dumps, and
@@ -90,9 +90,9 @@ a change would do without doing it.
 | `network-diag.pl` | 2.0.0 | Network latency, DNS, MTU, packet loss and dual-stack on Linux and FreeBSD |
 | `system-diag.pl` | 2.0.0 | System health with a grade from A to F. Linux only |
 | `security-audit.pl` | 2.0.0 | Security posture with a grade from A to F and an exit code for cron. Linux only |
-| `server-setup.pl` | 2.0.0 | Server initial setup for Fedora, CentOS Stream and openEuler |
+| `server-setup.pl` | 2.1.0 | Server initial setup for Fedora, CentOS Stream and openEuler |
 | `workstation-setup.pl` | 2.0.0 | Fedora desktop setup |
-| `sglang-deploy.pl` | 2.0.0 | SGLang inference server on an AMD GPU, behind nginx with HTTPS |
+| `sglang-deploy.pl` | 2.1.0 | SGLang inference server on an AMD GPU, behind Caddy with HTTPS |
 | `system-optimise.pl` | 2.0.0 | System cleanup; refuses rpm-ostree systems |
 
 The full flag reference is in [docs/CLI.md](docs/CLI.md).

SECURITY.md

@@ -61,7 +61,7 @@ is a defect worth reporting:
   user who runs the script.
 - Missing hardening with no demonstrated impact, such as a script not setting a stricter
   umask than the system's.
-- Flaws in a third-party tool the scripts drive (`dnf`, `podman`, `openssl`, `nginx` and
+- Flaws in a third-party tool the scripts drive (`dnf`, `podman`, `openssl`, `caddy` and
   the rest): report those to that project, and here only when this repository's use of
   the tool makes the flaw reachable in a way the tool's own documentation does not
   anticipate.

docs/ARCHITECTURE.md

@@ -37,7 +37,7 @@ reports everything as already in place and changes nothing.
 | `system-diag.pl` | Reading CPU, memory, disk, network, GPU, services, security and performance, and grading the result | Change anything on the host; it is read-only |
 | `server-setup.pl` | Base packages, firewall (with the SSH rule verified before the service starts), SELinux, Podman, automatic updates | Install the services themselves; that is the operator's, and the deploy scripts' |
 | `workstation-setup.pl` | A Fedora desktop: Brave, the official Go toolchain, Rust, GoLand, Flatpak applications, firewall, SELinux | Anything on a server distribution; it targets Fedora Workstation |
-| `sglang-deploy.pl` | The SGLang deployment: the container engine, the systemd unit, nginx with TLS, the API key, the firewall rule and the SELinux boolean | The host's own setup, which `server-setup.pl` does first |
+| `sglang-deploy.pl` | The SGLang deployment: the container engine, the systemd unit, Caddy with TLS, the API key, the firewall rule and the SELinux checks | The host's own setup, which `server-setup.pl` does first |
 | `system-optimise.pl` | Old kernels (the running one and one fallback always stay), journals, temporary files, core dumps, and the package audit | Touch an rpm-ostree system, which it refuses |
 
 ## Data flow: a forked section collection
@@ -97,8 +97,8 @@ that CentOS Stream and openEuler cannot carry at all.
 
 ```mermaid
 flowchart LR
-    Client[client] -->|443| Nginx[nginx on the host, TLS]
+    Client[client] -->|443| Caddy[Caddy on the host, TLS]
-    Nginx -->|loopback, plain HTTP| Engine[SGLang in a Podman container]
+    Caddy -->|loopback, plain HTTP| Engine[SGLang in a Podman container]
     Engine -->|device nodes| GPU[/dev/kfd, /dev/dri]
     Engine -->|bind mount| Cache[state directory, model cache]
     Unit[systemd unit] -->|podman run| Engine
@@ -114,12 +114,24 @@ instead, and `--image` pins one. Radeon cards need `SGLANG_USE_AITER=false` and
 `SGLANG_ROCM_FUSED_DECODE_MLA=false` in the unit, which the script writes for them and
 never for an Instinct host.
 
+Caddy serves the endpoint from a drop-in under `/etc/caddy/Caddyfile.d`, which the
+distribution's default Caddyfile imports. Fedora carries the caddy package and CentOS
+Stream gets it from EPEL, whose repository file the script installs first; openEuler
+packages no caddy at all, so there the official release binary is installed instead,
+with the unit file the package would have carried. The service runs as the caddy user,
+so the private key is made group-readable for the caddy group, and on an
+SELinux-enforcing host the packaged caddy runs unconfined: no boolean is needed. A
+deployment made by an earlier release of this script carries an nginx configuration,
+which both a deploy and an uninstall remove.
+
 ## Dependencies
 
 Nothing outside the interpreter, and nothing that has to be installed beyond the tools
 each script's own dependency section installs. The non-obvious ones and their reasons:
 
 - `podman` for `sglang-deploy.pl`, because the engine is a container.
+- `caddy` for `sglang-deploy.pl`, because the endpoint serves TLS on 443; the
+  release binary and `tar` stand in where no repository carries the package.
 - `lspci` for the GPU family, and `rocm-smi` in `system-diag.pl` for AMD memory and
   utilisation figures.
 - `sha256sum` in `workstation-setup.pl`, because Perl's builtins have no hash.

docs/CLI.md

@@ -111,7 +111,7 @@ verified by checksum; Brave's repository key is verified by fingerprint before i
 ```
 Usage: sglang-deploy.pl [options]
 
-  --model ID                     Hugging Face model ID (menu when omitted)
+  --model ID                     ModelScope model ID (menu when omitted)
   --port N                       internal engine port (default: 8000, not 443)
   --tensor-parallel N            GPUs for tensor parallelism (default: 1, written as
                                  the engine's --tp-size)
@@ -130,19 +130,19 @@ Usage: sglang-deploy.pl [options]
   --api-key KEY                  API key for the endpoint (default: generate and
                                  store in /etc/sysconfig)
   --dry-run                      preview without making changes
-  --uninstall                    tear down the service, container, nginx config
+  --uninstall                    tear down the service, container, caddy drop-in
                                  and certificates
   --help                         show this help
   --version                      show the version
 ```
 
 Needs root. Without `--model` an interactive menu offers GLM 5.3, GLM 5.3 Flash,
-DeepSeek V4 Pro, DeepSeek V4 Flash, MiMo V2.5 Pro and MiMo V2.5, plus a free-form
+Qwen 3.8 Max, Qwen 3.8 Flash and DeepSeek V4.1 Flash, plus a free-form entry.
-entry. `--tensor-parallel`, `--max-model-len` and `--gpu-memory-utilization` are
+`--tensor-parallel`, `--max-model-len` and `--gpu-memory-utilization` are
 written to the unit as the engine's own `--tp-size`, `--context-length` and
 `--mem-fraction-static`. The API key is shown once when it is generated; a key given
 with `--api-key` is never echoed. `--uninstall` stops and disables the service, removes
-the unit, the container, the nginx configuration and the certificates, and keeps the
+the unit, the container, the caddy drop-in and the certificates, and keeps the
 image and the model cache.
 
 ## system-optimise.pl

docs/DEPLOYMENT.md

@@ -84,7 +84,7 @@ deployment an operator cares about, so the pipeline that publishes them never ru
 | Script | What it leaves behind | Where it is documented |
 |---|---|---|
 | `server-setup.pl` | Packages, firewalld with the SSH rule already allowed, SELinux enforcing, Podman, unattended updates | [docs/CLI.md](CLI.md) |
-| `sglang-deploy.pl` | A systemd unit running the engine in a Podman container, nginx with TLS in front, an API key file, the firewall rule and the SELinux boolean | [docs/ARCHITECTURE.md](ARCHITECTURE.md) |
+| `sglang-deploy.pl` | A systemd unit running the engine in a Podman container, Caddy with TLS in front, an API key file, the firewall rule and the SELinux checks | [docs/ARCHITECTURE.md](ARCHITECTURE.md) |
 | `workstation-setup.pl` | A Fedora desktop with the toolchains and applications installed | [docs/CLI.md](CLI.md) |
 
 The SGLang deployment is the only service in the collection, and the host needs no ROCm
@@ -100,6 +100,6 @@ where the script reads them:
 
 - The published copies are unversioned: whatever is on `main` is what is served.
 - `sglang-deploy.pl` keeps the engine's API key in `/etc/sysconfig/sglang`, mode 0600,
-  written by the script and never committed. A Hugging Face token for a gated model goes
+  written by the script and never committed. A ModelScope token for a gated model goes
-  into that same file as `HF_TOKEN`, which the unit forwards to the container.
+  into that same file as `MODELSCOPE_TOKEN`, which the unit forwards to the container.
 - The deploy secrets live in the Gitea repository settings, under Actions, Secrets.

docs/DEVELOPMENT.md

@@ -61,13 +61,15 @@ only be exercised as root.
 
 `tests/container/rig.pl` runs the real `sglang-deploy.pl` as root inside a container
 against a stub `PATH`: every command the script drives (`dnf`, `rpm`, `podman`,
-`systemctl`, `curl`, `openssl`, `nginx`, `firewall-cmd`, `getsebool`, `lspci`) is a
+`systemctl`, `curl`, `openssl`, `caddy`, `tar`, `useradd`, `semodule`, `firewall-cmd`,
-stub that answers from a fixture, so a run is deterministic and needs no network and no
+`getsebool`, `lspci`) is a stub that answers from a fixture, so a run is deterministic
-GPU. It covers the deploy end to end: the resolved image tag, the unit file, the nginx
+and needs no network and no GPU. It covers the deploy end to end: the resolved image
-configuration, the TLS certificate and its modes, the API key file, the SELinux
+tag, the unit file, the caddy drop-in and the main Caddyfile's import, the release
-boolean, the firewall rule, the idempotent second run, the dry run, the uninstall, the
+binary install for the hosts without a caddy package, the EPEL bootstrap on CentOS
-Radeon and MI300 paths, the offline and unpublished-tag failures, the argument
+Stream, the legacy nginx clean-up, the TLS certificate and its modes, the API key file,
-validation and the non-root refusal.
+the SELinux decisions, the firewall rule, the idempotent second run, the dry run, the
+uninstall, the Radeon and MI300 paths, the offline and unpublished-tag failures, the
+argument validation and the non-root refusal.
 
 Prepare the platform image once, since the base images carry no Perl:
 

server-setup.pl

@@ -44,7 +44,7 @@
 use strict;
 use warnings;
 
-my $VERSION = '2.0.0';
+my $VERSION = '2.1.0';
 
 my $BOLD   = "\033[1m";
 my $RED    = "\033[31m";
@@ -67,16 +67,39 @@ my %SUPPORTED_OS = (
 );
 
 # Base packages installed on Fedora, CentOS Stream and openEuler alike.
+# caddy is the reverse proxy the deploy scripts serve the endpoints through;
+# openEuler ships no package for it, and install_packages says so and leaves
+# it to the script that needs it.
 my @BASE_PACKAGES = qw(
-    nano curl wget htop tmux rsync nginx openssl jq fastfetch
+    nano curl wget htop tmux rsync caddy openssl jq fastfetch
 );
 
 # Services to open in firewalld by default.  ssh is mandatory: losing it means
 # locking out remote administration.
 my @FIREWALL_SERVICES = ('ssh');
 
-# Opened in firewalld only when nginx is installed, which it is by default.
+# Opened in firewalld only when caddy is installed, which it is by default
-my @NGINX_FIREWALL_SERVICES = ('http', 'https');
+# wherever the package exists.
+my @CADDY_FIREWALL_SERVICES = ('http', 'https');
+
+# The one base package a distribution's repositories do not carry, with the
+# reason and who provides it instead.
+my %UNPACKAGED = (
+    openeuler => {
+        caddy => 'openEuler ships no caddy package; the scripts that need the '
+               . 'proxy install the release binary themselves',
+    },
+);
+
+# Test-visible accessors: the catalogue is lexical to this file, so the checks
+# under tests/ read the base package list and the unpackaged map through these.
+sub base_packages { return @BASE_PACKAGES; }
+
+sub unpackaged_for {
+    my ($os_id) = @_;
+    return () unless exists $UNPACKAGED{$os_id};
+    return %{ $UNPACKAGED{$os_id} };
+}
 
 # dnf-automatic configuration file.  dnf 4 ships it with defaults; dnf 5 reads host
 # overrides from this path (its own defaults live in /usr/share/dnf5).
@@ -565,19 +588,29 @@ sub ensure_epel {
 # ---------------------------------------------------------------------------
 
 sub install_packages {
-    my ($dry_run) = @_;
+    my ($os_id, $dry_run) = @_;
-    my (@installed, @skipped, @failed, @to_install);
+    my (@installed, @skipped, @failed, @to_install, @unpackaged);
 
     _status('Checking base packages');
     for my $pkg (@BASE_PACKAGES) {
+        # exists and not a bare lookup: descending into a missing os key
+        # would autovivify it.
+        if (exists $UNPACKAGED{$os_id} && exists $UNPACKAGED{$os_id}{$pkg}) {
+            push @unpackaged, [$pkg, $UNPACKAGED{$os_id}{$pkg}];
+            next;
+        }
         if (rpm_installed($pkg)) { push @skipped, $pkg }
         else                     { push @to_install, $pkg }
     }
 
     my $already = scalar @skipped;
     my $missing = scalar @to_install;
-    my $total = scalar @BASE_PACKAGES;
+    my $total = scalar @BASE_PACKAGES - scalar @unpackaged;
     _status_done("$already/$total already installed");
+    for my $entry (@unpackaged) {
+        my ($pkg, $reason) = @$entry;
+        _info("$pkg is not packaged on this distribution: $reason");
+    }
 
     if (!@to_install) {
         _ok('All base packages already present');
@@ -663,9 +696,9 @@ sub setup_firewall {
         $info{installed} = 1;
     }
 
-    # ssh is mandatory; http and https only when nginx is present.
+    # ssh is mandatory; http and https only when caddy is present.
     my @services = @FIREWALL_SERVICES;
-    push @services, @NGINX_FIREWALL_SERVICES if rpm_installed('nginx');
+    push @services, @CADDY_FIREWALL_SERVICES if rpm_installed('caddy');
 
     # --- Permanent rules first, through the offline client, which needs no daemon
     my $permanent_changed = 0;
@@ -1776,7 +1809,7 @@ sub main {
     # 3. Base packages
     print STDERR "\n${BOLD}── Base Packages ──$RESET\n";
     if (!$opt{skip_packages}) {
-        $results{packages} = install_packages($opt{dry_run});
+        $results{packages} = install_packages($os_id, $opt{dry_run});
         if (@{ $results{packages}{failed} }) {
             push @warnings, 'Some packages failed to install: '
                 . join(', ', @{ $results{packages}{failed} });

sglang-deploy.pl

@@ -4,12 +4,14 @@
 
 # Idempotent SGLang deployment for AMD ROCm GPUs.
 #
-# SGLang behind nginx with self-signed TLS on Fedora, CentOS Stream or openEuler.
+# SGLang behind Caddy with self-signed TLS on Fedora, CentOS Stream or openEuler.
 # The engine binds to ::1 (IPv4 loopback fallback) on port 8000, internal only;
-# nginx proxies :443 to the loopback upstream with streaming (SSE) support.  The
+# Caddy proxies :443 to the loopback upstream and streams (SSE) unbuffered.  The
 # endpoint requires an API key, delivered to the service through a 0600
-# EnvironmentFile; nginx to engine proxying is allowed through SELinux on enforcing
+# EnvironmentFile.  Caddy's service runs as the caddy user, so the private key is
-# systems.
+# made group-readable for the caddy group, and on SELinux-enforcing hosts the
+# distribution's caddy runs unconfined, which needs no boolean; where a confined
+# caddy policy is loaded anyway the script sets httpd_can_network_connect.
 #
 # Why the engine runs in a container rather than straight on the host:
 #
@@ -19,8 +21,8 @@
 # Rust), which Fedora carries only partly and which CentOS Stream and openEuler, where
 # ROCm itself is unsupported by AMD, cannot carry at all.  Both AMD and SGLang document
 # the container as the way to run SGLang on ROCm, so the container is what this script
-# deploys: podman runs the official image, and the host keeps nginx, TLS, the API key,
+# deploys: podman runs the official image, and the host keeps Caddy, TLS, the API key,
-# the firewall and the SELinux boolean.  The host needs no ROCm userland, only the
+# the firewall and the SELinux story.  The host needs no ROCm userland, only the
 # amdgpu kernel driver and its device nodes, /dev/kfd and /dev/dri.
 #
 # Radeon cards: the project publishes no stable image for gfx1151 (Strix Halo, the
@@ -42,7 +44,9 @@
 # keeps stdout and stderr apart in the scratch directory.
 #
 # External binaries used: dnf, rpm, curl, podman, lspci, openssl, systemctl,
-# getenforce, getsebool, setsebool, firewall-cmd and nginx.
+# getenforce, getsebool, setsebool, semodule, firewall-cmd, caddy, tar, install and
+# useradd (the last four only on a host where no repository carries the caddy
+# package and the release binary is installed instead).
 #
 # Usage:
 #     sglang-deploy.pl                                          # interactive model selection
@@ -55,7 +59,7 @@
 use strict;
 use warnings;
 
-my $VERSION = '2.0.0';
+my $VERSION = '2.1.0';
 
 my $BOLD   = "\033[1m";
 my $RED    = "\033[31m";
@@ -78,11 +82,11 @@ my %SUPPORTED_OS = (
 );
 
 # Tools this script itself needs.  podman is the engine's runtime: SGLang ships no
-# ROCm wheel, so the server runs from the project's own ROCm image.
+# ROCm wheel, so the server runs from the project's own ROCm image.  caddy is
-my @DNF_PACKAGES = qw(pciutils curl openssl podman);
+# installed in its own step rather than in this transaction: a name the
-
+# repositories do not carry aborts the whole dnf run, and openEuler ships no
-# Packages the engine expects from server-setup.pl (warning only, not installed here).
+# caddy at all (there the release binary takes its place).
-my @REQUIRED_SERVER_PACKAGES = (['nginx', 'reverse proxy']);
+my @DNF_PACKAGES = qw(pciutils curl openssl podman tar);
 
 # Default models for interactive selection when --model is omitted, keyed by
 # display name.  Every ID is a ModelScope repository, which is where the engine
@@ -176,6 +180,19 @@ my $DEFAULT_CERT_DIR = '/etc/ssl/sglang';
 my $DEFAULT_SERVICE  = 'sglang';
 my $INTERNAL_PORT    = 8000;
 
+# Caddy, the endpoint's TLS proxy.  Fedora carries the package, CentOS Stream
+# gets it from EPEL, and openEuler ships none, so where no package can be
+# installed the official release binary takes its place, with the unit file the
+# package would have carried.  The distribution's default Caddyfile imports the
+# Caddyfile.d directory, which is the drop-in this script writes; a main file
+# without the import line gets it appended.
+my $CADDY_RELEASES_API     = 'https://api.github.com/repos/caddyserver/caddy/releases/latest';
+my $CADDY_FALLBACK_VERSION = '2.10.2';
+my $CADDY_BINARY_PATH      = '/usr/local/bin/caddy';
+my $CADDY_CONFIG_DIR       = '/etc/caddy';
+my $CADDY_IMPORT_LINE      = 'import Caddyfile.d/*.caddyfile';
+my $LEGACY_NGINX_DIR       = '/etc/nginx/conf.d';
+
 # ModelScope model IDs look like "org/name", the same shape Hugging Face uses.
 # The strict pattern also keeps systemd specifier characters (%) and whitespace
 # out of unit files.
@@ -287,7 +304,7 @@ sub write_file {
     my ($path, $content) = @_;
     open(my $fh, '>', $path) or return 0;
     # The flush of a buffered handle surfaces at close, so close is checked too:
-    # a full disk must not report a truncated unit file or nginx configuration
+    # a full disk must not report a truncated unit file or Caddyfile drop-in
     # as written.
     my $ok = print {$fh} $content;
     $ok = 0 unless close($fh);
@@ -691,7 +708,7 @@ sub ms_model_status {
     return 'unknown';
 }
 
-# Return (bind_host, nginx_upstream_host): IPv6 ::1 first.
+# Return (bind_host, caddy_upstream_host): IPv6 ::1 first.
 #
 # Falls back to 127.0.0.1 on kernels with IPv6 disabled
 # (net.ipv6.conf.all.disable_ipv6=1), where binding ::1 would fail.
@@ -760,7 +777,7 @@ sub cert_san {
 # ---------------------------------------------------------------------------
 
 sub install_system_deps {
-    my ($dry_run) = @_;
+    my ($os_id, $dry_run) = @_;
     my %results = (installed => [], skipped => [], failed => []);
 
     my @missing;
@@ -820,17 +837,199 @@ sub install_system_deps {
         _fail('podman is not installed: the engine runs as a container and cannot start');
     }
 
-    # Packages expected from server-setup.pl (warning only, not installed here).
+    # Caddy proxies the endpoint on 443.  Fedora carries the package; CentOS
-    for my $entry (@REQUIRED_SERVER_PACKAGES) {
+    # Stream carries it in EPEL, whose repository file installs first; where no
-        my ($pkg, $purpose) = @$entry;
+    # repository carries it at all (openEuler ships none), the official release
-        if (!rpm_installed($pkg)) {
+    # binary takes its place, unit file included.  The step is separate from the
-            _warn("$pkg ($purpose) is not installed: run server-setup.pl first");
+    # transaction above, because one unresolvable name aborts a whole dnf run.
+    my $caddy = caddy_binary();
+    if (defined $caddy) {
+        _status('Checking caddy');
+        my $result = run([$caddy, 'version'], timeout => 30);
+        my $version = $result->{out};
+        $version =~ s/^\s+//;
+        $version =~ s/\s+$//;
+        $version = (split /\s+/, $version)[0] // '';
+        _status_done($version ne '' ? $version : 'installed');
+        $results{caddy} = $version ne '' ? $version : 'installed';
+    }
+    elsif ($dry_run) {
+        _status('Checking caddy');
+        _status_done('would install');
+        $results{caddy} = 'dry run';
+    }
+    else {
+        # CentOS Stream carries caddy in EPEL, and the repository file ships in
+        # its extras repository: installing it first is what makes caddy
+        # resolvable in the transaction below.
+        if ($os_id eq 'centos' && !rpm_installed('epel-release')) {
+            _status('Enabling EPEL (caddy is packaged there)');
+            my $epel = run(['dnf', 'install', '-y', 'epel-release'], timeout => $DNF_TIMEOUT);
+            if ($epel->{rc} == 0) {
+                _status_done('ok');
+            }
+            else {
+                _status_done('failed');
+                my $err = $epel->{err};
+                $err =~ s/\s+$//;
+                _info("dnf stderr: $err") if length $err;
+            }
+        }
+        _status('Installing caddy');
+        my $package = run(['dnf', 'install', '-y', 'caddy'], timeout => $DNF_TIMEOUT);
+        if ($package->{rc} == 0) {
+            _status_done('package');
+            $results{caddy} = 'package';
+        }
+        elsif (install_caddy_binary()) {
+            _status_done('release binary');
+            $results{caddy} = 'release binary';
+        }
+        else {
+            _status_done('failed');
+            $results{caddy} = undef;
+            _fail('caddy is not available: the endpoint cannot be served on 443');
         }
     }
 
     return \%results;
 }
 
+# The caddy binary the script drives, package or release binary.  An absolute
+# fallback is needed because a systemd unit and a fresh install reach the
+# binary before any PATH that carries /usr/local/bin.
+sub caddy_binary {
+    my $exe = find_exe('caddy');
+    return $exe if defined $exe;
+    return (-f $CADDY_BINARY_PATH && -x _) ? $CADDY_BINARY_PATH : undef;
+}
+
+# The newest caddy release version ('2.10.2'), from the GitHub API with a
+# constant as the fallback.  The charset bound keeps whatever the API answers
+# out of the download URL.
+sub resolve_caddy_version {
+    my $listing = fetch_text($CADDY_RELEASES_API);
+    if ($listing =~ /"tag_name"\s*:\s*"v(\d+\.\d+\.\d+)"/) {
+        return $1;
+    }
+    return $CADDY_FALLBACK_VERSION;
+}
+
+# caddy publishes release assets as caddy_VERSION_linux_ARCH.tar.gz.
+sub uname_to_arch {
+    my ($machine) = @_;
+    return 'amd64' if $machine eq 'x86_64';
+    return 'arm64' if $machine eq 'aarch64';
+    return undef;
+}
+
+sub caddy_asset_url {
+    my ($version, $arch) = @_;
+    return "https://github.com/caddyserver/caddy/releases/download"
+        . "/v$version/caddy_${version}_linux_${arch}.tar.gz";
+}
+
+# Install caddy from the official release binary, for the hosts no repository
+# carries the package for (openEuler ships none).  Everything the package would
+# have provided is provided here: the binary, the directories, the service user
+# and the unit file, copied from the distribution's own unit.  The caller owns
+# the progress line; this reports only failures.
+sub install_caddy_binary {
+    my $version = resolve_caddy_version();
+    my $machine = run(['uname', '-m'], timeout => 15)->{out};
+    $machine =~ s/^\s+//;
+    $machine =~ s/\s+$//;
+    my $arch = uname_to_arch($machine);
+    if (!defined $arch) {
+        _fail("caddy publishes no release binary for $machine");
+        return 0;
+    }
+
+    my $curl = find_exe('curl');
+    my $tar = find_exe('tar');
+    my $install = find_exe('install');
+    if (!defined $curl || !defined $tar || !defined $install) {
+        _fail('curl, tar or install is missing: cannot install the caddy release binary');
+        return 0;
+    }
+
+    my $dir = scratch_dir();
+    my $tarball = "$dir/caddy.tar.gz";
+    my $download = run([$curl, '-fsSL', '-o', $tarball, caddy_asset_url($version, $arch)],
+        timeout => 300);
+    if ($download->{rc} != 0) {
+        my $err = $download->{err};
+        $err =~ s/\s+$//;
+        _fail("The caddy release download failed: $err");
+        return 0;
+    }
+
+    my $extract = "$dir/caddy-extract";
+    mkdir($extract, 0700);
+    my $unpacked = run([$tar, '-xzf', $tarball, '-C', $extract], timeout => 60);
+    if ($unpacked->{rc} != 0 || !-f "$extract/caddy") {
+        _fail('The caddy release archive is not readable');
+        return 0;
+    }
+
+    for my $path ($CADDY_CONFIG_DIR, "$CADDY_CONFIG_DIR/Caddyfile.d", '/var/lib/caddy') {
+        mkdir($path, 0755) unless -d $path;
+    }
+    my $placed = run([$install, '-m', '0755', "$extract/caddy", $CADDY_BINARY_PATH],
+        timeout => 30);
+    if ($placed->{rc} != 0) {
+        my $err = $placed->{err};
+        $err =~ s/\s+$//;
+        _fail("Could not install $CADDY_BINARY_PATH: $err");
+        return 0;
+    }
+
+    if (!getpwnam('caddy')) {
+        my $user = run(['useradd', '--system', '--home-dir', '/var/lib/caddy',
+            '--create-home', '--shell', '/sbin/nologin', 'caddy'], timeout => 30);
+        if ($user->{rc} != 0) {
+            _warn('The caddy user could not be created: create it before starting caddy');
+        }
+    }
+
+    my $unit_path = '/etc/systemd/system/caddy.service';
+    if (!write_file($unit_path, caddy_unit_content())) {
+        _fail("Could not write $unit_path: " . os_error_text($unit_path));
+        return 0;
+    }
+    run(['systemctl', 'daemon-reload'], timeout => 30);
+
+    return 1;
+}
+
+# The unit file for a release-binary install: the distribution's own unit, with
+# the binary path adjusted.  validate in ExecStartPre is what keeps a broken
+# Caddyfile from taking the service down at boot.
+sub caddy_unit_content {
+    return <<"UNIT";
+[Unit]
+Description=Caddy web server
+Documentation=https://caddyserver.com/docs/
+After=network.target
+
+[Service]
+User=caddy
+Group=caddy
+ExecStartPre=$CADDY_BINARY_PATH validate --config $CADDY_CONFIG_DIR/Caddyfile
+ExecStart=$CADDY_BINARY_PATH run --environ --config $CADDY_CONFIG_DIR/Caddyfile
+ExecReload=$CADDY_BINARY_PATH reload --config $CADDY_CONFIG_DIR/Caddyfile
+TimeoutStopSec=5s
+LimitNOFILE=1048576
+PrivateTmp=true
+ProtectHome=true
+ProtectSystem=full
+AmbientCapabilities=CAP_NET_BIND_SERVICE CAP_NET_ADMIN
+
+[Install]
+WantedBy=multi-user.target
+UNIT
+}
+
 # ---------------------------------------------------------------------------
 # 2. Pre-flight checks
 # ---------------------------------------------------------------------------
@@ -1119,6 +1318,21 @@ sub fetch_engine_image {
 # 5. TLS certificate (self-signed)
 # ---------------------------------------------------------------------------
 
+# The caddy service runs as the caddy user (the package creates it), so the
+# private key has to cross the group line: root keeps the ownership and the
+# caddy group gets read.  Without the group (the package is missing) the key
+# stays root-only and the caddy step reports what is missing.
+sub ensure_caddy_key_readable {
+    my ($key_path) = @_;
+    my ($group, undef, $gid) = getgrnam('caddy');
+    if (!defined $group) {
+        return 0;
+    }
+    chown(0, $gid, $key_path);
+    chmod(0640, $key_path);
+    return 1;
+}
+
 sub setup_tls {
     my ($cert_dir, $dry_run) = @_;
     my %results;
@@ -1127,6 +1341,7 @@ sub setup_tls {
 
     _status('Checking TLS certificate');
     if (-f $crt_path && -f $key_path) {
+        $results{key_readable} = ensure_caddy_key_readable($key_path);
         _status_done('already exists');
         $results{cert_exists} = 1;
         return \%results;
@@ -1172,6 +1387,7 @@ sub setup_tls {
     if ($result->{rc} == 0) {
         chmod 0600, $key_path;
         chmod 0644, $crt_path;
+        $results{key_readable} = ensure_caddy_key_readable($key_path);
         _status_done('generated');
         $results{cert_created} = 1;
     }
@@ -1288,10 +1504,13 @@ sub encode_base64url {
 # 7. SELinux
 # ---------------------------------------------------------------------------
 
-# Allow nginx to reach the engine's port on SELinux-enforcing systems.
+# Allow Caddy to reach the engine's port on SELinux-enforcing systems.
 #
-# http_port_t covers 80/81/443/488/8008/8009/8443/9000 but not the engine's port, so
+# The distributions package caddy without an SELinux policy module, so its
-# on enforcing systems nginx needs httpd_can_network_connect.
+# service runs unconfined and needs no boolean at all.  Where a confined caddy
+# policy is loaded anyway (a local module), proxying to the engine's port needs
+# httpd_can_network_connect: http_port_t covers 80/81/443/488/8008/8009/8443/9000
+# but not the engine's port.
 sub setup_selinux {
     my ($dry_run) = @_;
     my %results;
@@ -1315,12 +1534,28 @@ sub setup_selinux {
     }
     _status_done('enforcing');
 
+    _status('Checking for a confined caddy policy');
+    my $semodule = find_exe('semodule');
+    my $confined = 0;
+    if (defined $semodule) {
+        my $list = run([$semodule, '-l'], timeout => 30);
+        # "semodule -l" lines read "100 caddy(pp)" or the plain "caddy 1.0"
+        # of older releases; the priority column is optional in the match.
+        $confined = 1 if $list->{rc} == 0 && $list->{out} =~ /^\s*(?:\d+\s+)?\S*caddy\b/m;
+    }
+    if (!$confined) {
+        _status_done('none (caddy runs unconfined)');
+        $results{selinux} = 'unconfined';
+        return \%results;
+    }
+    _status_done('confined policy loaded');
+
     _status('Checking httpd_can_network_connect boolean');
     my $getsebool = find_exe('getsebool');
     my $setsebool = find_exe('setsebool');
     if (!defined $getsebool || !defined $setsebool) {
         _status_done('tools missing');
-        _warn('getsebool/setsebool not found: nginx proxying may be blocked (502)');
+        _warn('getsebool/setsebool not found: caddy proxying may be blocked (502)');
         $results{selinux} = 'failed';
         return \%results;
     }
@@ -1356,59 +1591,143 @@ sub setup_selinux {
 }
 
 # ---------------------------------------------------------------------------
-# 8. nginx configuration
+# 8. Caddy configuration
 # ---------------------------------------------------------------------------
 
-# Return the nginx server block content.
+# Return the Caddyfile drop-in for the endpoint.
 #
-# HTTP/1.1 with an empty Connection header and proxy_buffering off are required for
+# Caddy streams proxied responses immediately when flush_interval is negative,
-# the engine's SSE streaming: nginx's defaults (HTTP/1.0, buffering on) would hold a
+# which the engine's SSE completions need; the nginx equivalent was HTTP/1.1
-# whole streamed completion until generation finishes.  The IPv6 listener is emitted
+# with proxy_buffering off.  Caddy sets X-Forwarded-For and X-Forwarded-Proto
-# only when the kernel actually has IPv6 enabled (the same check as detect_loopback);
+# itself and passes the Host header through, so only X-Real-IP is written.
-# socket() on [::]:443 would otherwise fail with EAFNOSUPPORT and take nginx down.
+# There is no read timeout: a completion that generates for minutes must not be
-sub nginx_conf_content {
+# cut at a fixed limit, and the response ends when the engine ends it.  No bind
+# directive is written: Caddy listens on both loopback families on kernels with
+# IPv6 and falls back to IPv4 alone where the kernel has none.  The nesting is
+# tab-indented, which is how the Caddyfile is formatted.
+sub caddyfile_content {
     my ($port, $upstream_host, $cert_dir) = @_;
-    my $ipv6_listen = -e '/proc/net/if_inet6' ? "listen [::]:443 ssl;\n    " : '';
     return <<"CONF";
-server {
+:443 {
-    ${ipv6_listen}listen 443 ssl;
+	tls $cert_dir/$CONTAINER_NAME.crt $cert_dir/$CONTAINER_NAME.key
-    server_name _;
+	request_body {
-
+		max_size 50MB
-    ssl_certificate $cert_dir/$CONTAINER_NAME.crt;
+	}
-    ssl_certificate_key $cert_dir/$CONTAINER_NAME.key;
+	reverse_proxy $upstream_host:$port {
-    ssl_protocols TLSv1.2 TLSv1.3;
+		flush_interval -1
-
+		header_up X-Real-IP {remote_host}
-    client_max_body_size 50m;
-
-    location / {
-        proxy_pass http://$upstream_host:$port;
-        proxy_http_version 1.1;
-        proxy_set_header Connection "";
-        proxy_set_header Host \$host;
-        proxy_set_header X-Real-IP \$remote_addr;
-        proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
-        proxy_set_header X-Forwarded-Proto \$scheme;
-        proxy_buffering off;
-        proxy_read_timeout 300s;
-        proxy_send_timeout 300s;
 	}
 }
 CONF
 }
 
-sub nginx_conf_path {
+sub caddyfile_path {
     my ($service_name) = @_;
-    return "/etc/nginx/conf.d/$service_name.conf";
+    return "$CADDY_CONFIG_DIR/Caddyfile.d/$service_name.caddyfile";
 }
 
-sub setup_nginx {
+sub caddy_main_config {
+    return "$CADDY_CONFIG_DIR/Caddyfile";
+}
+
+# The main Caddyfile must import the drop-in directory.  The distributions'
+# default file carries the import; a host without the file gets a minimal one,
+# and one that does not import gets the line appended, which is inert while the
+# directory holds nothing else.
+sub ensure_caddy_import {
+    my ($dry_run) = @_;
+    my %results;
+    my $main = caddy_main_config();
+
+    my $current = -f $main ? slurp($main) : '';
+    _status('Checking the Caddyfile import');
+    # Any import of the drop-in directory counts, not only this script's exact
+    # line: appending a second one would make Caddy read every drop-in twice.
+    if ($current =~ /^\s*import\s+Caddyfile\.d\//m) {
+        _status_done('present');
+        $results{caddy_import} = 'present';
+        return \%results;
+    }
+    if ($dry_run) {
+        _status_done('would add');
+        $results{caddy_import} = 'dry run';
+        return \%results;
+    }
+    for my $dir ($CADDY_CONFIG_DIR, "$CADDY_CONFIG_DIR/Caddyfile.d") {
+        mkdir($dir, 0755) unless -d $dir;
+    }
+    my $desired = length($current)
+        ? $current . (substr($current, -1) eq "\n" ? '' : "\n") . "$CADDY_IMPORT_LINE\n"
+        : "$CADDY_IMPORT_LINE\n";
+    if (write_file($main, $desired)) {
+        chmod 0644, $main;
+        _status_done(length $current ? 'added' : 'created');
+        $results{caddy_import} = length $current ? 'added' : 'created';
+    }
+    else {
+        _status_done('failed');
+        _fail("Could not write $main: " . os_error_text($main));
+        $results{caddy_import} = 0;
+    }
+    return \%results;
+}
+
+# A deployment made by the nginx release leaves its drop-in behind.  Remove it,
+# so exactly one proxy owns :443; nginx itself stays, for whatever else it serves.
+sub remove_legacy_nginx {
+    my ($service_name, $dry_run) = @_;
+    my %results;
+    my $legacy = "$LEGACY_NGINX_DIR/$service_name.conf";
+    return \%results unless -f $legacy;
+
+    _status('Removing the legacy nginx configuration');
+    if ($dry_run) {
+        _status_done('dry run');
+        $results{legacy_nginx_removed} = 'dry run';
+        return \%results;
+    }
+    unlink($legacy);
+    if (systemctl_is_active('nginx')) {
+        my $reload = run(['systemctl', 'reload', 'nginx'], timeout => 30);
+        if ($reload->{rc} == 0) {
+            _status_done('removed and nginx reloaded');
+        }
+        else {
+            _status_done('removed (nginx reload failed)');
+            my $err = $reload->{err};
+            $err =~ s/\s+$//;
+            _warn("nginx reload failed: $err");
+        }
+    }
+    else {
+        _status_done('removed (nginx not running)');
+    }
+    $results{legacy_nginx_removed} = 1;
+    return \%results;
+}
+
+sub setup_caddy {
     my ($port, $upstream_host, $cert_dir, $service_name, $dry_run) = @_;
     my %results;
-    my $conf_path = nginx_conf_path($service_name);
-    my $desired_content = nginx_conf_content($port, $upstream_host, $cert_dir);
 
-    # Write the nginx config if it is missing or different.
+    my $import = ensure_caddy_import($dry_run);
-    _status('Checking nginx configuration');
+    $results{caddy_import} = $import->{caddy_import};
+
+    my $legacy = remove_legacy_nginx($service_name, $dry_run);
+    $results{legacy_nginx_removed} = $legacy->{legacy_nginx_removed}
+        if defined $legacy->{legacy_nginx_removed};
+
+    my $conf_path = caddyfile_path($service_name);
+    my $desired_content = caddyfile_content($port, $upstream_host, $cert_dir);
+
+    if (!$dry_run) {
+        for my $dir ($CADDY_CONFIG_DIR, "$CADDY_CONFIG_DIR/Caddyfile.d") {
+            mkdir($dir, 0755) unless -d $dir;
+        }
+    }
+
+    # Write the drop-in if it is missing or different.
+    _status('Checking the caddy configuration');
     if (-f $conf_path) {
         my $current = slurp($conf_path);
         $current =~ s/^\s+//;
@@ -1418,95 +1737,107 @@ sub setup_nginx {
         $desired =~ s/\s+$//;
         if ($current eq $desired) {
             _status_done('already configured');
-            $results{nginx_configured} = 1;
+            $results{caddy_configured} = 1;
         }
         elsif ($dry_run) {
             _status_done('would update');
-            $results{nginx_configured} = 'dry run';
+            $results{caddy_configured} = 'dry run';
         }
         elsif (write_file($conf_path, $desired_content)) {
+            chmod 0644, $conf_path;
             _status_done('updated');
-            $results{nginx_configured} = 1;
+            $results{caddy_configured} = 1;
         }
         else {
             _status_done('failed');
             _fail("Could not write $conf_path: " . os_error_text($conf_path));
-            $results{nginx_configured} = 0;
+            $results{caddy_configured} = 0;
         }
     }
     elsif ($dry_run) {
         _status_done('would create');
-        $results{nginx_configured} = 'dry run';
+        $results{caddy_configured} = 'dry run';
     }
     elsif (write_file($conf_path, $desired_content)) {
+        chmod 0644, $conf_path;
         _status_done('created');
-        $results{nginx_configured} = 1;
+        $results{caddy_configured} = 1;
     }
     else {
         _status_done('failed');
         _fail("Could not write $conf_path: " . os_error_text($conf_path));
-        $results{nginx_configured} = 0;
+        $results{caddy_configured} = 0;
     }
 
-    # Ensure nginx is enabled and running (handles the enabled-but-stopped case).
+    # Ensure caddy is enabled and running (handles the enabled-but-stopped case).
-    _status('Ensuring nginx service is enabled and running');
+    _status('Ensuring caddy service is enabled and running');
-    my $nginx_running = systemctl_is_active('nginx');
+    my $caddy_running = systemctl_is_active('caddy');
-    if (systemctl_is_enabled('nginx') && $nginx_running) {
+    if (systemctl_is_enabled('caddy') && $caddy_running) {
         _status_done('running');
-        $results{nginx_running} = 1;
+        $results{caddy_running} = 1;
     }
     elsif ($dry_run) {
         _status_done('dry run');
-        $results{nginx_running} = 'dry run';
+        $results{caddy_running} = 'dry run';
     }
     else {
-        my $start_result = systemctl_is_enabled('nginx')
+        my $start_result = systemctl_is_enabled('caddy')
-            ? run(['systemctl', 'start', 'nginx'], timeout => 30)
+            ? run(['systemctl', 'start', 'caddy'], timeout => 30)
-            : run(['systemctl', 'enable', '--now', 'nginx'], timeout => 30);
+            : run(['systemctl', 'enable', '--now', 'caddy'], timeout => 30);
         if ($start_result->{rc} == 0) {
             _status_done('enabled and started');
-            $results{nginx_running} = 1;
+            $results{caddy_running} = 1;
         }
         else {
             _status_done('failed');
             my $err = $start_result->{err};
             $err =~ s/\s+$//;
-            _warn("Could not start nginx: $err");
+            _warn("Could not start caddy: $err");
-            $results{nginx_running} = 0;
+            $results{caddy_running} = 0;
         }
     }
 
-    # Test and reload the configuration (only possible when nginx is running).
+    # Validate and reload the configuration (only possible when caddy is running).
-    _status('Reloading nginx configuration');
+    _status('Reloading caddy configuration');
     if ($dry_run) {
         _status_done('dry run');
-        $results{nginx_reloaded} = 'dry run';
+        $results{caddy_reloaded} = 'dry run';
     }
-    elsif (!$results{nginx_running}) {
+    elsif (!$results{caddy_running}) {
-        _status_done('skipped (nginx not running)');
+        _status_done('skipped (caddy not running)');
-        $results{nginx_reloaded} = 0;
+        $results{caddy_reloaded} = 0;
     }
     else {
-        my $test_result = run(['nginx', '-t'], timeout => 30);
+        my $caddy = caddy_binary();
-        if ($test_result->{rc} != 0) {
+        if (!defined $caddy) {
+            _status_done('caddy not found');
+            _fail('caddy is not installed: cannot validate the configuration');
+            $results{caddy_reloaded} = 0;
+        }
+        else {
+            my $validate = run([$caddy, 'validate', '--config', caddy_main_config()],
+                timeout => 60);
+            if ($validate->{rc} != 0) {
                 _status_done('config test failed');
-            my $err = $test_result->{err};
+                my $err = $validate->{err} . $validate->{out};
                 $err =~ s/\s+$//;
-            _fail("nginx -t failed: $err");
+                my $tail = length($err) > 500 ? substr($err, -500) : $err;
-            $results{nginx_reloaded} = 0;
+                _fail("caddy validate failed: $tail");
+                $results{caddy_reloaded} = 0;
             }
             else {
-            my $reload_result = run(['systemctl', 'reload', 'nginx'], timeout => 30);
+                my $reload_result = run(['systemctl', 'reload', 'caddy'], timeout => 30);
                 if ($reload_result->{rc} == 0) {
                     _status_done('reloaded');
-                $results{nginx_reloaded} = 1;
+                    $results{caddy_reloaded} = 1;
                 }
                 else {
                     _status_done('failed');
                     my $err = $reload_result->{err};
                     $err =~ s/\s+$//;
-                _fail("nginx reload failed: $err");
+                    _fail("caddy reload failed: $err");
-                $results{nginx_reloaded} = 0;
+                    $results{caddy_reloaded} = 0;
+                }
             }
         }
     }
@@ -1885,15 +2216,50 @@ sub uninstall {
         $results{env_not_found} = 1;
     }
 
-    # Remove the nginx config.
+    # Remove the caddy drop-in.  The main Caddyfile stays: it may carry sites
-    my $nginx_conf = nginx_conf_path($service_name);
+    # this deployment knows nothing about, and the import line is inert once
-    _status("Removing nginx $service_name configuration");
+    # the drop-in is gone.
-    if (-f $nginx_conf) {
+    my $caddy_conf = caddyfile_path($service_name);
+    _status("Removing the caddy $service_name drop-in");
+    if (-f $caddy_conf) {
         if ($dry_run) {
             _status_done('dry run');
         }
         else {
-            unlink($nginx_conf);
+            unlink($caddy_conf);
+            if (systemctl_is_active('caddy')) {
+                my $reload_result = run(['systemctl', 'reload', 'caddy'], timeout => 30);
+                if ($reload_result->{rc} != 0) {
+                    _status_done('removed (caddy reload failed)');
+                    my $err = $reload_result->{err};
+                    $err =~ s/\s+$//;
+                    _warn("caddy reload failed: $err");
+                }
+                else {
+                    _status_done('removed and caddy reloaded');
+                }
+            }
+            else {
+                _status_done('removed (caddy not running)');
+            }
+            $results{caddy_removed} = 1;
+        }
+    }
+    else {
+        _status_done('not present');
+        $results{caddy_not_found} = 1;
+    }
+
+    # Remove the drop-in the nginx release wrote, when one is left over.
+    my $legacy_conf = "$LEGACY_NGINX_DIR/$service_name.conf";
+    _status('Removing the legacy nginx configuration');
+    if (-f $legacy_conf) {
+        if ($dry_run) {
+            _status_done('dry run');
+        }
+        else {
+            unlink($legacy_conf);
+            if (systemctl_is_active('nginx')) {
                 my $reload_result = run(['systemctl', 'reload', 'nginx'], timeout => 30);
                 if ($reload_result->{rc} != 0) {
                     _status_done('removed (nginx reload failed)');
@@ -1904,12 +2270,15 @@ sub uninstall {
                 else {
                     _status_done('removed and nginx reloaded');
                 }
-            $results{nginx_removed} = 1;
+            }
+            else {
+                _status_done('removed (nginx not running)');
+            }
+            $results{legacy_nginx_removed} = 1;
         }
     }
     else {
         _status_done('not present');
-        $results{nginx_not_found} = 1;
     }
 
     # Remove the TLS certificates.
@@ -1939,7 +2308,9 @@ sub uninstall {
     _info('Kept on the system (remove manually if unwanted):');
     _info("  the engine image (podman rmi <image>)");
     _info("  $state_dir (ModelScope cache with downloaded model weights)");
-    _info("  firewalld 'https' rule and the SELinux httpd_can_network_connect boolean");
+    _info('  the caddy service and /etc/caddy');
+    _info("  the firewalld 'https' rule (and the SELinux boolean, where a confined "
+        . 'caddy policy needed it)');
 
     return \%results;
 }
@@ -1966,7 +2337,8 @@ sub print_summary {
             ['unit_removed',       'systemd unit removed'],
             ['container_removed',  'engine container removed'],
             ['env_removed',        'API key environment file removed'],
-            ['nginx_removed',      'nginx config removed'],
+            ['caddy_removed',      'caddy drop-in removed'],
+            ['legacy_nginx_removed', 'legacy nginx configuration removed'],
             ['certs_removed',      'TLS certificates removed'],
         ) {
             my ($key, $label) = @$pair;
@@ -1981,7 +2353,7 @@ sub print_summary {
             ['unit_not_found',      'systemd unit: already absent'],
             ['container_not_found', 'engine container: already absent'],
             ['env_not_found',       'API key environment file: already absent'],
-            ['nginx_not_found',     'nginx config: already absent'],
+            ['caddy_not_found',     'caddy drop-in: already absent'],
             ['certs_not_found',     'TLS certs: already absent'],
         ) {
             my ($key, $label) = @$pair;
@@ -2096,17 +2468,28 @@ sub print_summary {
         elsif ($se && $se eq 'absent') {
             _info('SELinux: not installed (skipped)');
         }
+        elsif ($se && $se eq 'unconfined') {
+            _info('SELinux: caddy runs unconfined (nothing to do)');
+        }
 
-        my $ng = $results->{nginx} // {};
+        my $cd = $results->{caddy} // {};
-        if ($ng->{nginx_configured} && $ng->{nginx_configured} eq 1
+        if (defined $cd->{legacy_nginx_removed}) {
-            && $ng->{nginx_reloaded} && $ng->{nginx_reloaded} eq 1) {
+            if ($cd->{legacy_nginx_removed} eq 1) {
-            _ok('nginx: configured and reloaded');
+                _ok('Legacy nginx configuration: removed');
             }
-        elsif ($ng->{nginx_configured} && $ng->{nginx_configured} eq 1) {
+            else {
-            _fail('nginx: config written but reload failed');
+                _info('Legacy nginx configuration: would be removed');
             }
-        elsif (($ng->{nginx_configured} // '') eq 'dry run') {
+        }
-            _info('nginx: would write config and reload');
+        if ($cd->{caddy_configured} && $cd->{caddy_configured} eq 1
+            && $cd->{caddy_reloaded} && $cd->{caddy_reloaded} eq 1) {
+            _ok('Caddy: configured and reloaded');
+        }
+        elsif ($cd->{caddy_configured} && $cd->{caddy_configured} eq 1) {
+            _fail('Caddy: drop-in written but reload failed');
+        }
+        elsif (($cd->{caddy_configured} // '') eq 'dry run') {
+            _info('Caddy: would write the drop-in and reload');
         }
 
         my $svc = $results->{systemd} // {};
@@ -2178,7 +2561,7 @@ Usage: sglang-deploy.pl [options]
   --api-key KEY                  API key for the endpoint (default: generate and
                                  store in /etc/sysconfig)
   --dry-run                      preview without making changes
-  --uninstall                    tear down the service, container, nginx config
+  --uninstall                    tear down the service, container, caddy drop-in
                                  and certificates
   --help                         show this help
   --version                      show the version
@@ -2340,9 +2723,9 @@ sub is_positive_int {
     return defined $value && $value =~ /^\d+$/ && $value + 0 > 0;
 }
 
-# A directory the generated nginx configuration and the unit file carry
+# A directory the generated Caddyfile drop-in and the unit file carry verbatim:
-# verbatim: absolute, and free of the whitespace that splits arguments, of the
+# absolute, and free of the whitespace that splits arguments and of the %
-# % systemd expands as a specifier and of the ; that ends an nginx directive.
+# systemd expands as a specifier.
 sub valid_dir_path {
     my ($path) = @_;
     return 0 unless defined $path && length $path;
@@ -2387,7 +2770,7 @@ sub validate_args {
     if (!is_positive_int($args->{port}) || $args->{port} + 0 > 65535
         || $args->{port} + 0 == 443) {
         _fail("Invalid --port $args->{port}: must be an integer 1-65535 and not 443 "
-            . "(nginx)");
+            . '(Caddy serves 443)');
         exit 1;
     }
     if (!is_number($args->{gpu_memory_utilization})
@@ -2469,7 +2852,7 @@ sub main {
     # ── Deploy path ──
     # 1. System dependencies (before preflight: provides lspci, curl and podman).
     print STDERR "\n${BOLD}── System Dependencies ──${RESET}\n";
-    $results{system_deps} = install_system_deps($args->{dry_run});
+    $results{system_deps} = install_system_deps($os_id, $args->{dry_run});
     my @failed_pkgs = @{ $results{system_deps}{failed} // [] };
     push @failures, 'failed to install packages: ' . join(', ', @failed_pkgs) if @failed_pkgs;
 
@@ -2501,7 +2884,7 @@ sub main {
         exit 1;
     }
 
-    # 5. TLS certificate (fatal, nginx cannot start without it).
+    # 5. TLS certificate (fatal, caddy cannot start without it).
     print STDERR "\n${BOLD}── TLS Certificate ──${RESET}\n";
     $results{tls} = setup_tls($args->{cert_dir}, $args->{dry_run});
     if (defined $results{tls}{cert_created} && $results{tls}{cert_created} eq 0) {
@@ -2524,13 +2907,13 @@ sub main {
         push @failures, 'SELinux boolean httpd_can_network_connect not set';
     }
 
-    # 8. nginx.
+    # 8. Caddy.
-    print STDERR "\n${BOLD}── nginx ──${RESET}\n";
+    print STDERR "\n${BOLD}── Caddy ──${RESET}\n";
-    $results{nginx} = setup_nginx(
+    $results{caddy} = setup_caddy(
         $args->{port}, $upstream_host, $args->{cert_dir}, $args->{service_name}, $args->{dry_run},
     );
-    if (defined $results{nginx}{nginx_reloaded} && $results{nginx}{nginx_reloaded} eq 0) {
+    if (defined $results{caddy}{caddy_reloaded} && $results{caddy}{caddy_reloaded} eq 0) {
-        push @failures, 'nginx configuration reload failed';
+        push @failures, 'caddy configuration reload failed';
     }
 
     # 9. systemd service (the model is probed before the unit is written).

tests/container/rig.pl

@@ -16,7 +16,11 @@ my $LOG    = "$WORK/log/stubs.log";
 my $SCRIPT = $ENV{SGLANG_RIG_SCRIPT} // "$RIG/../../sglang-deploy.pl";
 my $UNIT   = '/etc/systemd/system/sglang.service';
 my $ENVFILE = '/etc/sysconfig/sglang';
-my $NGINX  = '/etc/nginx/conf.d/sglang.conf';
+my $CADDY  = '/etc/caddy/Caddyfile.d/sglang.caddyfile';
+my $CADDY_MAIN = '/etc/caddy/Caddyfile';
+my $CADDY_UNIT = '/etc/systemd/system/caddy.service';
+my $CADDY_BIN  = '/usr/local/bin/caddy';
+my $NGINX_LEGACY = '/etc/nginx/conf.d/sglang.conf';
 my $CERTDIR = '/etc/ssl/sglang';
 my $STATEDIR = '/opt/sglang';
 
@@ -105,22 +109,27 @@ sub mode_of {
 }
 
 sub reset_fixture {
-    for my $path ($UNIT, $ENVFILE, $NGINX) {
+    for my $path ($UNIT, $ENVFILE, $CADDY, $CADDY_MAIN, $CADDY_UNIT, $CADDY_BIN,
+        $NGINX_LEGACY) {
         unlink($path);
     }
+    remove_tree('/etc/caddy');
     remove_tree($CERTDIR);
     remove_tree($STATEDIR);
     remove_tree($FIX);
     remove_tree($ST);
-    # Directories a host that ran server-setup.pl has: nginx's configuration drop-in
+    # Directories a host that ran server-setup.pl has: the legacy nginx drop-in
-    # and systemd's unit directory.
+    # directory an earlier release wrote into, and systemd's unit directory.
     make_dirs($FIX, $ST, "$WORK/log", '/etc/nginx/conf.d', '/etc/systemd/system');
     my $fh;
     open($fh, q{>}, $LOG) and close($fh);
-    # Packages a real host or a previous run has already installed.
+    # Packages a real host or a previous run has already installed.  nginx stands
+    # for the drop-in the previous release left behind.
     write_fixture('rpm-installed', "nginx\n");
     write_fixture('fw-services', "\n");
     # firewalld is running: server-setup.pl ensures it, and the firewall step needs it.
+    # The handle is declared first: a my inside the open's argument list does not
+    # reach the right-hand operand of the and on this interpreter.
     my $fw;
     open($fw, '>', "$ST/active.firewalld") and close($fw);
     return;
@@ -184,8 +193,8 @@ sub reset_log {
 # so the script's own PATH lookup finds them and nothing of the real system is used.
 sub prepare_stubs {
     make_dirs($BIN, $FIX, $ST, "$WORK/log");
-    for my $name (qw(lspci rpm dnf podman systemctl curl openssl nginx
+    for my $name (qw(lspci rpm dnf podman systemctl curl openssl caddy tar useradd
-        firewall-cmd getenforce getsebool setsebool)) {
+        semodule firewall-cmd getenforce getsebool setsebool)) {
         my $link = "$BIN/$name";
         # A link left over from a work directory that moved reads as broken to
         # -e, and its stale target would leave the stubs unreachable: it is
@@ -197,6 +206,21 @@ sub prepare_stubs {
     return;
 }
 
+# The caddy package creates its group; the rig creates it the same way, so the
+# key permission the package makes possible is exercised for real.  The group
+# file is edited directly: the minimal openEuler image carries no groupadd to
+# call, and a group entry is all the getgrnam in the script needs.
+sub prepare_group {
+    return if defined getgrnam('caddy');
+    my $existing = slurp_file('/etc/group');
+    my $gid = 995;
+    $gid++ while $existing =~ /^[^:]+:[^:]*:\Q$gid\E:/m;
+    open(my $fh, '>>', '/etc/group') or die "cannot append to /etc/group: $!\n";
+    print {$fh} "caddy:x:$gid:\n";
+    close($fh);
+    return;
+}
+
 sub prepare_devices {
     # The driver creates these on a real host; the rig fakes them (needs --privileged).
     return if -e q{/dev/kfd};
@@ -214,12 +238,15 @@ sub scenario_fresh {
     check($rc == 0, 'fresh: exit 0');
     check(-f $UNIT, 'fresh: unit written');
     check(-f $ENVFILE, 'fresh: environment file written');
-    check(-f $NGINX, 'fresh: nginx configuration written');
+    check(-f $CADDY, 'fresh: caddy drop-in written');
+    check(-f $CADDY_MAIN, 'fresh: main Caddyfile written');
     check(-f "$CERTDIR/sglang.crt" && -f "$CERTDIR/sglang.key", 'fresh: certificate written');
     check(-d "$STATEDIR/modelscope", 'fresh: model cache directory created');
     check(mode_of($ENVFILE) eq '0600', 'fresh: environment file is 0600 (' . mode_of($ENVFILE) . ')');
-    check(mode_of("$CERTDIR/sglang.key") eq '0600', 'fresh: key is 0600');
+    check(mode_of("$CERTDIR/sglang.key") eq '0640', 'fresh: key is 0640 for the caddy group (' . mode_of("$CERTDIR/sglang.key") . ')');
     check(mode_of("$CERTDIR/sglang.crt") eq '0644', 'fresh: certificate is 0644');
+    check((stat("$CERTDIR/sglang.key"))[5] == getgrnam('caddy'),
+        'fresh: the key belongs to the caddy group');
 
     my $env = slurp_file($ENVFILE);
     check_like($env, qr/^SGLANG_API_KEY=([A-Za-z0-9_-]{43})\n$/, 'fresh: generated key, url-safe, 43 chars');
@@ -231,19 +258,29 @@ sub scenario_fresh {
     check_like($unit, qr/--mem-fraction-static 0\.9/, 'fresh: memory fraction default');
     check_unlike($unit, qr/SGLANG_USE_AITER/, 'fresh: no Radeon variables on an Instinct host');
 
-    my $nginx = slurp_file($NGINX);
+    my $caddy = slurp_file($CADDY);
-    check_like($nginx, qr|proxy_pass http://\[::1\]:8000;|, 'fresh: nginx proxies to the loopback engine');
+    check_like($caddy, qr/reverse_proxy \[::1\]:8000 \{/, 'fresh: caddy proxies to the loopback engine');
-    check_like($nginx, qr|ssl_certificate /etc/ssl/sglang/sglang\.crt;|, 'fresh: nginx uses the sglang certificate');
+    check_like($caddy, qr|tls /etc/ssl/sglang/sglang\.crt /etc/ssl/sglang/sglang\.key|,
+        'fresh: caddy uses the sglang certificate pair');
+    check_like($caddy, qr/flush_interval -1/, 'fresh: streaming is unbuffered');
+    my $main = slurp_file($CADDY_MAIN);
+    check_like($main, qr/^import Caddyfile\.d\/\*\.caddyfile$/m, 'fresh: the main Caddyfile imports the drop-ins');
 
     check(count_in_log(qr/^podman pull /) == 1, 'fresh: exactly one image pull');
     check_like(stub_log(), qr/^podman pull docker\.io\/lmsysorg\/sglang:v0\.5\.19-rocm724-mi30x$/m,
         'fresh: the pulled image is the resolved tag');
+    check_like(stub_log(), qr/^caddy version$/m, 'fresh: caddy is reported from the binary');
+    check_like(stub_log(), qr/^caddy validate --config \/etc\/caddy\/Caddyfile$/m,
+        'fresh: the configuration is validated before the reload');
+    check_like(stub_log(), qr/^systemctl enable --now caddy$/m, 'fresh: caddy enabled and started');
+    check_like(stub_log(), qr/^systemctl reload caddy$/m, 'fresh: caddy reloaded');
     check(count_in_log(qr/^systemctl enable sglang$/) == 1, 'fresh: service enabled');
     check(count_in_log(qr/^systemctl start sglang$/) == 1, 'fresh: service started');
     check_like(stub_log(), qr/^firewall-cmd --permanent --add-service=https$/m, 'fresh: HTTPS opened');
     check_like($out, qr/Engine image: docker\.io\/lmsysorg\/sglang:v0\.5\.19-rocm724-mi30x/,
         'fresh: summary names the image');
     check_like($out, qr/systemd: sglang running on \[::1\]:8000/, 'fresh: summary names the endpoint');
+    check_like($out, qr/Caddy: configured and reloaded/, 'fresh: summary reports caddy');
     check_like($out, qr/API key \(shown once, store it securely\)/, 'fresh: the generated key is shown once');
     check_unlike($out, qr/✗/, 'fresh: no failed step');
     return;
@@ -261,6 +298,7 @@ sub scenario_rerun {
     check_like(stub_log(), qr/^podman image exists /m, 'rerun: the image is checked instead');
     check(count_in_log(qr/^systemctl enable sglang$/) == 0, 'rerun: no second enable');
     check(count_in_log(qr/^systemctl start sglang$/) == 0, 'rerun: no second start');
+    check(count_in_log(qr/^systemctl enable --now caddy$/) == 0, 'rerun: no second caddy enable');
     check(count_in_log(qr/try-restart/) == 0, 'rerun: no restart, the unit did not change');
     check(count_in_log(qr/^dnf install /) == 0, 'rerun: no second package transaction');
     check(slurp_file($ENVFILE) eq $key_before, 'rerun: the API key is reused, not regenerated');
@@ -282,7 +320,8 @@ sub scenario_dry_run {
     check($rc == 0, 'dry run: exit 0');
     check(!-f $UNIT, 'dry run: no unit written');
     check(!-f $ENVFILE, 'dry run: no environment file written');
-    check(!-f $NGINX, 'dry run: no nginx configuration written');
+    check(!-f $CADDY, 'dry run: no caddy drop-in written');
+    check(!-e '/etc/caddy', 'dry run: no caddy directory created');
     check(!-d $CERTDIR, 'dry run: no certificate directory');
     check(count_in_log(qr/^podman pull /) == 0, 'dry run: no pull');
     check(count_in_log(qr/^systemctl (enable|start) /) == 0, 'dry run: no service change');
@@ -302,14 +341,17 @@ sub scenario_uninstall {
     check($rc == 0, 'uninstall: exit 0');
     check(!-f $UNIT, 'uninstall: unit removed');
     check(!-f $ENVFILE, 'uninstall: environment file removed');
-    check(!-f $NGINX, 'uninstall: nginx configuration removed');
+    check(!-f $CADDY, 'uninstall: caddy drop-in removed');
+    check(-f $CADDY_MAIN, 'uninstall: the main Caddyfile is kept');
     check(!-d $CERTDIR, 'uninstall: certificate directory removed');
     check(-d $STATEDIR, 'uninstall: model cache kept');
     check(-e "$ST/image.docker.io_lmsysorg_sglang_v0.5.19-rocm724-mi30x",
         'uninstall: the image is kept in podman');
     check_like(stub_log(), qr/^systemctl stop sglang$/m, 'uninstall: service stopped');
     check_like(stub_log(), qr/^systemctl disable sglang$/m, 'uninstall: service disabled');
+    check_like(stub_log(), qr/^systemctl reload caddy$/m, 'uninstall: caddy reloaded after the drop-in');
     check_like($out, qr/SGLang service stopped/, 'uninstall: summary reports the stop');
+    check_like($out, qr/caddy drop-in removed/, 'uninstall: summary reports the drop-in');
     check_like($out, qr/Kept on the system/, 'uninstall: the kept state is listed');
     check_like($out, qr/ModelScope cache/, 'uninstall: the cache is named as kept');
     return;
@@ -322,6 +364,78 @@ sub scenario_uninstall_twice {
     check($rc == 0, 'uninstall twice: exit 0');
     check_like($out, qr/already absent/, 'uninstall twice: idempotent');
     check(count_in_log(qr/^systemctl stop /) == 0, 'uninstall twice: nothing to stop');
+    check(count_in_log(qr/^systemctl reload caddy$/) == 0,
+        'uninstall twice: no reload without a drop-in');
+    return;
+}
+
+# A host deployed by the nginx release carries its drop-in.  Both a deploy and
+# an uninstall remove it, so exactly one proxy owns :443 afterwards.
+sub scenario_legacy_nginx {
+    reset_fixture();
+    write_fixture('gpu.txt', "03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Instinct MI300X OAM [1002:74a1]\n");
+    write_fixture('rocm.txt', "7.2.4\n");
+    open(my $fh, '>', $NGINX_LEGACY) or die "cannot write $NGINX_LEGACY: $!\n";
+    print {$fh} "server {\n    listen 443 ssl;\n}\n";
+    close($fh);
+    # The stub state: nginx is running on this host, so the removal reloads it.
+    my $st;
+    open($st, '>', "$ST/active.nginx") and close($st);
+    my ($rc, $out) = run_script('--model', 'ZhipuAI/GLM-5.3');
+    check($rc == 0, 'legacy nginx: exit 0');
+    check(!-f $NGINX_LEGACY, 'legacy nginx: the old drop-in is gone on deploy');
+    check_like(stub_log(), qr/^systemctl reload nginx$/m,
+        'legacy nginx: the running nginx is reloaded');
+    check_like($out, qr/Legacy nginx configuration: removed/, 'legacy nginx: the summary names it');
+
+    # An uninstall on a host the new release never deployed cleans it too.
+    reset_fixture();
+    write_fixture('gpu.txt', "03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Instinct MI300X OAM [1002:74a1]\n");
+    write_fixture('rocm.txt', "7.2.4\n");
+    open($fh, '>', $NGINX_LEGACY) or die "cannot write $NGINX_LEGACY: $!\n";
+    print {$fh} "server {\n    listen 443 ssl;\n}\n";
+    close($fh);
+    reset_log();
+    ($rc, $out) = run_script('--uninstall');
+    check($rc == 0, 'legacy nginx: uninstall exit 0');
+    check(!-f $NGINX_LEGACY, 'legacy nginx: the old drop-in is gone on uninstall');
+    check_like($out, qr/legacy nginx configuration removed/, 'legacy nginx: the uninstall summary names it');
+    return;
+}
+
+# Where no repository carries the caddy package, the official release binary
+# takes its place: download, extract, install, the service user, and the unit
+# file the package would have carried.
+sub scenario_caddy_binary {
+    reset_fixture();
+    write_fixture('gpu.txt', "03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Instinct MI300X OAM [1002:74a1]\n");
+    write_fixture('rocm.txt', "7.2.4\n");
+    write_fixture('caddy-no-package', "1\n");
+    unlink('/usr/bin/caddy');    # order independence: no package binary, no stub
+    unlink("$BIN/caddy") or die "cannot remove the caddy stub: $!\n";
+    my ($rc, $out) = run_script('--model', 'ZhipuAI/GLM-5.3');
+
+    check($rc == 0, 'caddy binary: exit 0');
+    check_like(stub_log(), qr/^dnf install -y caddy$/m, 'caddy binary: the package install was attempted');
+    check_like(stub_log(), qr{^curl -fsSL -o \S+ https://github\.com/caddyserver/caddy/releases/download/v2\.10\.2/caddy_2\.10\.2_linux_amd64\.tar\.gz$}m,
+        'caddy binary: the release asset is downloaded');
+    check_like(stub_log(), qr/^tar -xzf \S+ -C \S+$/m, 'caddy binary: the archive is extracted');
+    check(-x $CADDY_BIN, 'caddy binary: the binary is installed executable');
+    check_like(stub_log(), qr/^useradd --system --home-dir \/var\/lib\/caddy --create-home --shell \/sbin\/nologin caddy$/m,
+        'caddy binary: the service user is created');
+    check(-f $CADDY_UNIT, 'caddy binary: the unit file is written');
+    my $unit = slurp_file($CADDY_UNIT);
+    check_like($unit, qr|ExecStart=/usr/local/bin/caddy run --environ --config /etc/caddy/Caddyfile|,
+        'caddy binary: the unit runs the release binary');
+    check_like(stub_log(), qr/^systemctl daemon-reload$/m, 'caddy binary: systemd reloaded');
+    check_like(stub_log(), qr{^caddy validate --config /etc/caddy/Caddyfile$}m,
+        'caddy binary: the installed binary validates');
+    check_like($out, qr/Caddy: configured and reloaded/, 'caddy binary: the deployment completes');
+
+    unlink($CADDY_BIN);
+    unlink($CADDY_UNIT);
+    unlink("$FIX/caddy-no-package");
+    symlink("$RIG/stub.pl", "$BIN/caddy") or die "cannot restore the caddy stub: $!\n";
     return;
 }
 
@@ -495,7 +609,7 @@ sub scenario_validation {
     write_fixture('gpu.txt', "03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Instinct MI300X OAM [1002:74a1]\n");
     my ($rc, $out) = run_script('--model', 'ZhipuAI/GLM-5.3', '--port', '443', '--dry-run');
     check($rc == 1, 'validation: port 443 refused');
-    check_like($out, qr/must be 1-65535 and not 443/, 'validation: port message');
+    check_like($out, qr/must be an integer 1-65535 and not 443/, 'validation: port message');
     ($rc, $out) = run_script('--model', 'not-a-model-id', '--dry-run');
     check($rc == 1, 'validation: bad model ID refused');
     check_like($out, qr/Invalid model ID/, 'validation: model message');
@@ -545,7 +659,7 @@ sub scenario_non_root {
     my $rc = $? >> 8;
     my $out = slurp_file($out_file);
     check($rc == 0, 'non-root: --version works without root');
-    check_like($out, qr/^sglang-deploy\.pl 2\.0\.0$/, 'non-root: the version is printed');
+    check_like($out, qr/^sglang-deploy\.pl 2\.1\.0$/, 'non-root: the version is printed');
 
     my $pid3 = fork();
     die "cannot fork: $!\n" unless defined $pid3;
@@ -583,12 +697,12 @@ sub scenario_dependency_section {
     reset_fixture();
     write_fixture('gpu.txt', "03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Instinct MI300X OAM [1002:74a1]\n");
     write_fixture('rocm.txt', "7.2.4\n");
-    write_fixture('rpm-installed', "pciutils\ncurl\nopenssl\npodman\nnginx\n");
+    write_fixture('rpm-installed', "pciutils\ncurl\nopenssl\npodman\ntar\n");
     reset_log();
     my ($rc, $out) = run_script('--model', 'ZhipuAI/GLM-5.3', '--dry-run');
     check($rc == 0, 'deps: exit 0');
     check(count_in_log(qr/^dnf install /) == 0, 'deps: no transaction when all packages are present');
-    check_like($out, qr/All 4 packages already installed/, 'deps: reported as present');
+    check_like($out, qr/All 5 packages already installed/, 'deps: reported as present');
 
     reset_fixture();
     write_fixture('gpu.txt', "03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Instinct MI300X OAM [1002:74a1]\n");
@@ -596,10 +710,41 @@ sub scenario_dependency_section {
     write_fixture('rpm-installed', "\n");
     reset_log();
     ($rc, $out) = run_script('--model', 'ZhipuAI/GLM-5.3');
-    check_like(stub_log(), qr/^dnf install -y pciutils curl openssl podman$/m,
+    check_like(stub_log(), qr/^dnf install -y pciutils curl openssl podman tar$/m,
-        'deps: the four packages are installed in one transaction');
+        'deps: the five packages are installed in one transaction');
-    check_like($out, qr/nginx \(reverse proxy\) is not installed: run server-setup.pl first/,
+    check_like(stub_log(), qr/^caddy version$/m, 'deps: caddy is checked after the transaction');
-        'deps: the missing reverse proxy is warned about');
+    check_unlike($out, qr/run server-setup\.pl first/,
+        'deps: no warning points at server-setup.pl, caddy is installed here');
+    return;
+}
+
+# CentOS Stream carries caddy in EPEL, and the repository file installs first,
+# which is what makes the package transaction below it resolvable.
+sub scenario_epel {
+    reset_fixture();
+    write_fixture('gpu.txt', "03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Instinct MI300X OAM [1002:74a1]\n");
+    write_fixture('rocm.txt', "7.2.4\n");
+    my $real = slurp_file('/etc/os-release');
+    open(my $fh, '>', '/etc/os-release') or die "cannot write /etc/os-release: $!\n";
+    print {$fh} "ID=centos\nVERSION_ID=\"10\"\n";
+    close($fh);
+    unlink('/usr/bin/caddy');    # order independence: no binary, no stub
+    unlink("$BIN/caddy");
+    reset_log();
+    my ($rc, $out) = run_script('--model', 'ZhipuAI/GLM-5.3');
+    open(my $back, '>', '/etc/os-release') or die "cannot restore /etc/os-release: $!\n";
+    print {$back} $real;
+    close($back);
+
+    check($rc == 0, 'epel: exit 0');
+    check_like(stub_log(), qr/^dnf install -y epel-release$/m, 'epel: the repository file installs first');
+    check_like(stub_log(), qr/^dnf install -y caddy$/m, 'epel: the package installs after it');
+    check_like($out, qr/Installing caddy\.\.\. package/, 'epel: the package path is taken');
+    check_like($out, qr/Caddy: configured and reloaded/, 'epel: the deployment completes');
+
+    unlink('/usr/bin/caddy');
+    unlink("$FIX/caddy-no-package");
+    symlink("$RIG/stub.pl", "$BIN/caddy") or die "cannot restore the caddy stub: $!\n";
     return;
 }
 
@@ -619,7 +764,7 @@ sub scenario_custom_layout {
     );
     check($rc == 0, 'custom layout: exit 0');
     check(-f '/etc/systemd/system/llm.service', 'custom layout: the named unit is written');
-    check(-f '/etc/nginx/conf.d/llm.conf', 'custom layout: the named nginx file is written');
+    check(-f '/etc/caddy/Caddyfile.d/llm.caddyfile', 'custom layout: the named caddy drop-in is written');
     # The certificate file names follow the program, as they did before, not the
     # service name; the directory follows --cert-dir.
     check(-f '/etc/ssl/llm/sglang.crt', 'custom layout: certificates follow the directory');
@@ -632,7 +777,7 @@ sub scenario_custom_layout {
     check_like($unit, qr|--volume /srv/llm/modelscope:/root/\.cache/modelscope:Z|,
         'custom layout: the cache volume follows the state directory');
     unlink('/etc/systemd/system/llm.service');
-    unlink('/etc/nginx/conf.d/llm.conf');
+    unlink('/etc/caddy/Caddyfile.d/llm.caddyfile');
     remove_tree('/etc/ssl/llm');
     remove_tree('/srv/llm');
     return;
@@ -674,17 +819,32 @@ sub scenario_selinux {
     check(count_in_log(qr/^setsebool /) == 0, 'selinux: nothing set while permissive');
     check_like($out, qr/SELinux: permissive \(skipped\)/, 'selinux: reported as skipped');
 
+    # Enforcing with no confined caddy policy: the distributions run caddy
+    # unconfined, so no boolean is touched.
     reset_fixture();
     write_fixture('gpu.txt', "03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Instinct MI300X OAM [1002:74a1]\n");
     write_fixture('rocm.txt', "7.2.4\n");
     $ENV{STUB_SELINUX} = 'Enforcing';
     reset_log();
     ($rc, $out) = run_script('--model', 'ZhipuAI/GLM-5.3');
+    check(count_in_log(qr/^setsebool /) == 0, 'selinux: no boolean without a confined policy');
+    check_like($out, qr/SELinux: caddy runs unconfined \(nothing to do\)/,
+        'selinux: the unconfined case is stated');
+
+    # Enforcing with a confined caddy policy loaded: the boolean is set.
+    reset_fixture();
+    write_fixture('gpu.txt', "03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Instinct MI300X OAM [1002:74a1]\n");
+    write_fixture('rocm.txt', "7.2.4\n");
+    write_fixture('semodule-caddy', "1\n");
+    reset_log();
+    ($rc, $out) = run_script('--model', 'ZhipuAI/GLM-5.3');
+    check_like(stub_log(), qr/^semodule -l$/m, 'selinux: the loaded modules are asked for');
     check_like(stub_log(), qr/^setsebool -P httpd_can_network_connect=1$/m, 'selinux: the boolean is set');
     check_like($out, qr/SELinux: httpd_can_network_connect on/, 'selinux: reported as on');
     reset_log();
     my ($rc2, $out2) = run_script('--model', 'ZhipuAI/GLM-5.3');
     check(count_in_log(qr/^setsebool /) == 0, 'selinux: nothing set when already on');
+    unlink("$FIX/semodule-caddy");
     delete $ENV{STUB_SELINUX};
     return;
 }
@@ -695,6 +855,9 @@ my %scenarios = (
     dry_run           => \&scenario_dry_run,
     uninstall         => \&scenario_uninstall,
     uninstall_twice   => \&scenario_uninstall_twice,
+    legacy_nginx      => \&scenario_legacy_nginx,
+    caddy_binary      => \&scenario_caddy_binary,
+    epel              => \&scenario_epel,
     radeon            => \&scenario_radeon,
     radeon_dev        => \&scenario_radeon_dev,
     radeon_with_image => \&scenario_radeon_with_image,
@@ -715,6 +878,7 @@ my %scenarios = (
 );
 
 prepare_stubs();
+prepare_group();
 prepare_devices();
 
 my @wanted = @ARGV ? @ARGV : sort keys %scenarios;

tests/container/stub.pl

@@ -74,6 +74,12 @@ if ($name eq 'rpm') {
 
 if ($name eq 'dnf') {
     my @pkgs = grep { !/^-/ && $_ ne 'install' } @args;
+    # Parenthesised on purpose: a named list operator swallows a trailing &&,
+    # and the unparenthesised form asks the grep about a boolean, not the list.
+    if ((grep { $_ eq 'caddy' } @pkgs) && -f "$FIX/caddy-no-package") {
+        print STDERR "Error: Unable to find a match: caddy\n";
+        exit 1;
+    }
     my $installed = fixture_text('rpm-installed', '');
     for my $pkg (@pkgs) {
         $installed .= "$pkg\n" unless $installed =~ /^\Q$pkg\E$/m;
@@ -82,6 +88,12 @@ if ($name eq 'dnf') {
         print {$fh} $installed;
         close($fh);
     }
+    # A package transaction that installs caddy leaves the binary where PATH
+    # finds it, the way the real package does.  The grep is parenthesised as
+    # above: a named list operator swallows a trailing &&.
+    if ((grep { $_ eq 'caddy' } @pkgs) && !-e '/usr/bin/caddy') {
+        symlink($0, '/usr/bin/caddy');
+    }
     print "Installing: @pkgs\n";
     exit 0;
 }
@@ -138,14 +150,32 @@ if ($name eq 'curl') {
         print "\n__HTTP__$code\n" if $joined =~ /__HTTP__/;
         exit 0;
     }
+    if ($url =~ m{api\.github\.com/repos/caddyserver/caddy}) {
+        print fixture_text('caddy-release.json', qq({"tag_name":"v2.10.2"}\n));
+        exit 0;
+    }
     if ($url =~ m{api\.github\.com}) {
         print fixture_text('releases.json', qq({"tag_name":"v0.5.19"}\n));
         exit 0;
     }
+    if ($url =~ m{github\.com/caddyserver/caddy/releases/download/}) {
+        my $dest;
+        for my $i (0 .. $#args) {
+            $dest = $args[$i + 1] if $args[$i] eq '-o';
+        }
+        if (defined $dest) {
+            open(my $fh, '>', $dest) or exit 1;
+            print {$fh} "stub caddy release archive\n";
+            close($fh);
+        }
+        exit 0;
+    }
     if ($url =~ m{hub\.docker\.com}) {
-        if (-f "$FIX/image-missing") {
+        # A definitive 404 on a tag lookup is what the script reads as
-            print STDERR "curl: (22) The requested URL returned error: 404\n";
+        # unpublished; a curl-level failure would read as cannot-tell.
-            exit 22;
+        if ($url =~ m{/tags/[A-Za-z0-9._-]+$} && -f "$FIX/image-missing") {
+            print "404";
+            exit 0;
         }
         if ($url =~ /tags\?/) {
             # A tag listing, newest first: the rig's AMD development build.
@@ -181,8 +211,44 @@ if ($name eq 'openssl') {
     exit 0;
 }
 
-if ($name eq 'nginx') {
+if ($name eq 'caddy') {
-    print "nginx: configuration file /etc/nginx/nginx.conf test is successful\n";
+    my $joined = join(' ', @args);
+    if ($joined =~ /version/) {
+        print "v2.10.2 h1:stub\n";
+        exit 0;
+    }
+    if ($joined =~ /validate/) {
+        print "Valid configuration\n";
+        exit 0;
+    }
+    exit 0;
+}
+
+if ($name eq 'tar') {
+    # The release-binary install extracts the archive and installs the binary it
+    # names; the stub lays down a link to this dispatcher, so the installed
+    # stand-in answers and logs like every other stubbed command.
+    my $dest_dir;
+    for my $i (0 .. $#args) {
+        $dest_dir = $args[$i + 1] if $args[$i] eq '-C';
+    }
+    if (defined $dest_dir) {
+        unlink("$dest_dir/caddy");
+        symlink($0, "$dest_dir/caddy");
+    }
+    exit 0;
+}
+
+if ($name eq 'useradd') {
+    exit 0;
+}
+
+if ($name eq 'semodule') {
+    # A loaded module line looks like "100 caddy\tpp"; the fixture decides
+    # whether this host carries a confined caddy policy.
+    if (-f "$FIX/semodule-caddy") {
+        print "100 caddy\tpp\n";
+    }
     exit 0;
 }
 

tests/server-setup.pl

@@ -124,6 +124,25 @@ my %defaults = parse_args();
 is($defaults{dry_run}, 0, 'args: dry run is off by default');
 @ARGV = @saved;
 
+# ---------------------------------------------------------------------------
+# The base package catalogue
+# ---------------------------------------------------------------------------
+
+# The proxy of the collection is caddy everywhere; nginx left the baseline when
+# sglang-deploy.pl moved to Caddy, and the name survives only in its own legacy
+# clean-up.
+check((grep { $_ eq 'caddy' } base_packages()) == 1, 'packages: caddy is a base package');
+check((grep { $_ eq 'nginx' } base_packages()) == 0, 'packages: nginx is not');
+is(join('|', base_packages()),
+   'nano|curl|wget|htop|tmux|rsync|caddy|openssl|jq|fastfetch',
+   'packages: the whole list, in order');
+my %openeuler_gaps = unpackaged_for('openeuler');
+is(exists $openeuler_gaps{caddy} ? 'yes' : 'no', 'yes',
+   'packages: the openEuler gap is named in the unpackaged map');
+is(scalar(unpackaged_for('fedora')) // 0, 0, 'packages: Fedora has no unpackaged entry');
+is(scalar(unpackaged_for('centos')) // 0, 0,
+   'packages: CentOS Stream has no unpackaged entry, EPEL carries caddy');
+
 # ---------------------------------------------------------------------------
 # The command runner
 # ---------------------------------------------------------------------------

tests/sglang-deploy.pl

@@ -138,7 +138,7 @@ is((valid_dir_path('/opt/sg lang') ? 1 : 0), 0, 'valid_dir_path: whitespace is r
 is((valid_dir_path('/opt/%h/sglang') ? 1 : 0), 0,
    'valid_dir_path: a systemd specifier is refused');
 is((valid_dir_path('/opt/x;/sglang') ? 1 : 0), 0,
-   'valid_dir_path: an nginx directive end is refused');
+   'valid_dir_path: a path with a semicolon is refused');
 
 # ---- run(): exit status, signals and timeout ------------------------------
 my $killed = run([$^X, '-e', 'kill 9, $$']);
@@ -164,22 +164,43 @@ is(scalar @{ radeon_env_for(undef, 1) }, 2,
    'env: a custom image on a Radeon-only host carries the Radeon defaults');
 is(scalar @{ radeon_env_for('mi30x', 0) }, 0, 'env: an Instinct host carries none');
 
-# ---- nginx config --------------------------------------------------------
+# ---- caddy drop-in --------------------------------------------------------
-my $conf = nginx_conf_content(8000, '[::1]', '/etc/ssl/sglang');
+my $conf = caddyfile_content(8000, '[::1]', '/etc/ssl/sglang');
-like($conf, qr/listen \[::\]:443 ssl;/, 'nginx: IPv6 listener on a dual-stack kernel');
+like($conf, qr/^:443 \{$/m, 'caddy: the endpoint site on 443');
-like($conf, qr/listen 443 ssl;/, 'nginx: IPv4 listener');
+like($conf, qr|tls /etc/ssl/sglang/sglang\.crt /etc/ssl/sglang/sglang\.key|,
-like($conf, qr|ssl_certificate /etc/ssl/sglang/sglang\.crt;|, 'nginx: certificate path');
+     'caddy: certificate pair paths');
-like($conf, qr/ssl_certificate_key \/etc\/ssl\/sglang\/sglang\.key;/, 'nginx: key path');
+like($conf, qr/reverse_proxy \[::1\]:8000 \{/, 'caddy: loopback upstream with the port');
-like($conf, qr|proxy_pass http://\[::1\]:8000;|, 'nginx: loopback upstream with the port');
+like($conf, qr/flush_interval -1/, 'caddy: unbuffered streaming');
-like($conf, qr/proxy_http_version 1\.1;/, 'nginx: HTTP/1.1 for streaming');
+like($conf, qr/header_up X-Real-IP \{remote_host\}/, 'caddy: X-Real-IP survives the heredoc');
-like($conf, qr/proxy_buffering off;/, 'nginx: buffering off for streaming');
+like($conf, qr/max_size 50MB/, 'caddy: the request body limit');
-like($conf, qr/proxy_set_header Host \$host;/, 'nginx: $host survives the heredoc');
+like($conf, qr/\treverse_proxy /, 'caddy: tab-indented as the Caddyfile is formatted');
-like($conf, qr/proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;/,
+check_unlike($conf, qr/\bbind\b/, 'caddy: no bind directive, the kernel decides the families');
-     'nginx: $proxy_add_x_forwarded_for survives the heredoc');
+check_unlike($conf, qr/acme|on_demand|http:\/\/\{/i, 'caddy: no ACME, the self-signed pair is used');
 
-my $conf4 = nginx_conf_content(8000, '127.0.0.1', '/etc/ssl/sglang');
+my $conf4 = caddyfile_content(9000, '127.0.0.1', '/etc/ssl/llm');
-is($conf4 =~ /\[::\]/ ? 'yes' : 'no',
+like($conf4, qr/reverse_proxy 127\.0\.0\.1:9000 \{/, 'caddy: an IPv4 upstream carries the port');
-   (-e '/proc/net/if_inet6' ? 'yes' : 'no'), 'nginx: IPv6 listener follows the kernel');
+like($conf4, qr|tls /etc/ssl/llm/sglang\.crt|, 'caddy: the certificate directory follows --cert-dir');
+is(caddyfile_path('sglang'), '/etc/caddy/Caddyfile.d/sglang.caddyfile',
+   'caddy: the drop-in path follows the service name');
+is(caddy_main_config(), '/etc/caddy/Caddyfile', 'caddy: the main Caddyfile path');
+
+# ---- caddy release binary -------------------------------------------------
+is(uname_to_arch('x86_64'), 'amd64', 'caddy binary: x86_64 maps to amd64');
+is(uname_to_arch('aarch64'), 'arm64', 'caddy binary: aarch64 maps to arm64');
+is(uname_to_arch('ppc64le'), undef, 'caddy binary: an unmapped machine is refused');
+is(caddy_asset_url('2.10.2', 'amd64'),
+   'https://github.com/caddyserver/caddy/releases/download/v2.10.2/caddy_2.10.2_linux_amd64.tar.gz',
+   'caddy binary: the release asset URL');
+
+my $caddy_unit = caddy_unit_content();
+like($caddy_unit, qr|ExecStartPre=/usr/local/bin/caddy validate --config /etc/caddy/Caddyfile|,
+     'caddy binary: the unit validates before it starts');
+like($caddy_unit, qr|ExecStart=/usr/local/bin/caddy run --environ --config /etc/caddy/Caddyfile|,
+     'caddy binary: the unit runs the release binary');
+like($caddy_unit, qr|ExecReload=/usr/local/bin/caddy reload --config /etc/caddy/Caddyfile|,
+     'caddy binary: the unit reloads through the admin endpoint');
+like($caddy_unit, qr/^User=caddy$/m, 'caddy binary: the unit runs as the caddy user');
+like($caddy_unit, qr/AmbientCapabilities=CAP_NET_BIND_SERVICE/, 'caddy binary: the port capability');
 
 # ---- systemd unit --------------------------------------------------------
 my $unit = systemd_content({