Tizian 「ティツィアーン」
c8d67b1eb7
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The CI runner moves to halkyon.li's host at home and runs from 02:00 to 05:00 alone: a timer starts it, its unit's RuntimeMaxSec ends it, and night.sh rests the instance's heavy sidecars around it as deploy, while Caddy, PostgreSQL and the apps' servers keep serving. Jobs pushed during the day wait in Forgejo's queue. Its sandbox fits the new host: its folder on the HDD, the rest of /data hidden, containerd's store out of reach, no private IPv4 network and no IPv6 at all (the home network's IPv6 addresses are public ones under a changing prefix, on the internet's own interface), 5 GB of memory with swap beyond. The Sandbox step checks the tunnel, the home router and IPv6. BREAKING CHANGE: CI deploys nothing any more: the deploy job goes with learn.halkyon.eu's server, and halkyon.li deploys by hand with redeploy.sh once a commit's night's run passed. Jobs run on the runner labelled balthasar; sahaquiel's runner picks up none. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>
104 lines
5.1 KiB
Desktop File
104 lines
5.1 KiB
Desktop File
# The Forgejo Actions runner of this repository's CI, on halkyon.li's host at home (ADR
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# 0039, D6, D16; on learn.halkyon.eu's server until it retired in November 2026).
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# Installed as /etc/systemd/system/forgejo-runner.service; its configuration is
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# config.yml, next to this file. It runs in the nightly window alone: started at 02:00 by
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# forgejo-runner.timer, stopped three hours later (RuntimeMaxSec), while night.sh rests
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# the instance's heavy sidecars (halkyon-night.timer, halkyon-morning.timer). Jobs pushed
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# during the day wait in Forgejo's queue.
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#
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# Jobs run directly on the host as the unprivileged user `runner` ("without any
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# isolation" from that user, as Forgejo's security guide puts it), and they run our
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# dependencies' build code. On the production server, so everything below keeps them
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# away from production and makes sure CI can't starve the instance. Docker is out of
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# reach entirely: `runner` isn't in the docker group, and the socket is hidden too.
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#
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# `runner` has user and group ID 61000, and must never share a user ID with a
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# container's processes (PostgreSQL and the server run as 999; Docker doesn't remap
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# them): processes of one user ID can read each other's environment and, through
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# /proc, their files. `useradd --system` picks 999 when it is free, so create it with
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# useradd --system --uid 61000 --user-group --no-create-home \
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# --home-dir /var/lib/forgejo-runner --shell /usr/sbin/nologin runner
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# Its home is /data/forgejo-runner on the HDD (the root disk has no room for Flutter and
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# the caches), seen by the runner as /var/lib/forgejo-runner (BindPaths, below):
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# install -d -o runner -g runner -m 700 /data/forgejo-runner /var/lib/forgejo-runner
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# CI's first step checks this sandbox and fails if it leaks.
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[Unit]
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Description=Forgejo Actions runner (CI of halkyon_learn; jobs on the host)
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Documentation=https://forgejo.org/docs/latest/admin/actions/security/
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After=network-online.target
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Wants=network-online.target
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# Its folder is on the HDD, which its LUKS key file unlocks once the root disk is open.
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RequiresMountsFor=/data
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[Service]
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User=runner
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Group=runner
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WorkingDirectory=/var/lib/forgejo-runner
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ExecStart=/usr/local/bin/forgejo-runner daemon --config /etc/forgejo-runner/config.yml
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# The runner's token, from a root-only file.
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LoadCredential=token:/etc/forgejo-runner/token
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Restart=on-failure
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RestartSec=30
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# The runner waits up to 10 minutes for a running job (shutdown_timeout).
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TimeoutStopSec=11min
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# The nightly window's end: three hours after forgejo-runner.timer started it at 02:00. A
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# job still running is stopped, and the next one's Leftovers step clears what it left.
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RuntimeMaxSec=3h
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# Away from production: /home (deploy's .env, the checkout, the database dumps) is
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# invisible, and so is /data, where /home really lies, with Docker's data and the media,
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# but for the runner's own folder; the rest of the system is read-only, other users'
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# processes are hidden, and Docker and containerd out of reach.
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ProtectHome=yes
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ProtectSystem=strict
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TemporaryFileSystem=/data:ro
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BindPaths=/data/forgejo-runner:/var/lib/forgejo-runner
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ReadWritePaths=/var/lib/forgejo-runner
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PrivateTmp=yes
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ProtectProc=invisible
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InaccessiblePaths=-/run/docker.sock -/run/containerd -/var/lib/docker -/var/lib/containerd
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# The network: the internet over IPv4 alone. No private IPv4 network (the home network
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# and its router, Docker's networks, where the database listens, the tunnel to ramiel,
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# Multipass' bridges, CGNAT and link-local addresses), and no IPv6 at all: the home
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# network's IPv6 addresses are public ones, under a prefix the provider changes, on the
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# same interface as the internet, so no address or interface could tell them apart. All
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# CI fetches (pub.dev, GitHub, code.halkyon.app) answers over IPv4.
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IPAddressDeny=10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 100.64.0.0/10 169.254.0.0/16 ::/0
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NoNewPrivileges=yes
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CapabilityBoundingSet=
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AmbientCapabilities=
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SystemCallArchitectures=native
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RestrictSUIDSGID=yes
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ProtectKernelTunables=yes
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ProtectKernelModules=yes
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ProtectKernelLogs=yes
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ProtectControlGroups=yes
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ProtectClock=yes
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ProtectHostname=yes
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LockPersonality=yes
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RestrictRealtime=yes
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RestrictNamespaces=yes
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RemoveIPC=yes
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# Netlink stays: Dart lists network interfaces through it.
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RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6 AF_NETLINK
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# System calls no CI job needs fail with an error rather than killing the job.
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SystemCallFilter=~@clock @cpu-emulation @debug @module @mount @obsolete @raw-io @reboot @swap
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SystemCallErrorNumber=EPERM
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UMask=0077
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# Never at the instance's expense, which keeps serving through the night: three of the
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# four cores (its servers idle then), at most 5 GB of the 7.2 (the kernel reclaims from CI
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# first above 4.5 GB), and swap beyond, the lowest priority for CPU and disk, and CI's
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# processes the first the kernel kills should the whole machine run out of memory. A
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# cold `dart analyze` of the workspace with its lint plugin needs about 5.4 GB (3.7 GB
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# warm), so it swaps a little rather than being killed: slower, within the window.
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CPUQuota=300%
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MemoryHigh=4.5G
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MemoryMax=5G
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OOMScoreAdjust=1000
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TasksMax=2048
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Nice=10
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IOSchedulingClass=best-effort
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IOSchedulingPriority=7
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# No [Install]: never started at boot, only by forgejo-runner.timer.
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