3d9b7ef771
systemd applies WorkingDirectory= to every Exec line including ExecStartPre.
With the merged dir not yet existing at boot time (the volatile overlay
mount has been wiped), the chdir into runtime/%i/merged/left4dead2 fails
with status=200/CHDIR before ExecStartPre can run the mount helper.
The `-` prefix makes chdir failure non-fatal: ExecStartPre runs in the
unit's home (cwd doesn't matter for the mount helper); ExecStart re-applies
WorkingDirectory once the mount has landed and chdirs successfully.
Companion to commit 519567e (which added the ExecStartPre mount + helper
idempotency but didn't account for the WorkingDirectory ordering).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
57 lines
2 KiB
Desktop File
57 lines
2 KiB
Desktop File
[Unit]
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Description=left4me server instance %i
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After=network-online.target
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Wants=network-online.target
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[Service]
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Type=simple
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User=left4me
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Group=left4me
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EnvironmentFile=/etc/left4me/host.env
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EnvironmentFile=/var/lib/left4me/instances/%i/instance.env
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# `-` prefix: chdir failure is non-fatal. systemd applies WorkingDirectory
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# before every Exec line — including ExecStartPre — but the merged dir only
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# exists once ExecStartPre's overlay mount succeeds. With `-`, ExecStartPre
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# runs in the unit's home (cwd doesn't matter for the mount helper); the
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# ExecStart re-applies WorkingDirectory after the mount and finds the dir.
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WorkingDirectory=-/var/lib/left4me/runtime/%i/merged/left4dead2
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# At boot the kernel-overlayfs mount is gone (mounts are volatile); the
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# web app's start_instance also pre-mounts but doesn't run on auto-start.
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# The helper is idempotent — a no-op if already mounted by the web app.
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ExecStartPre=/usr/bin/sudo -n /usr/local/libexec/left4me/left4me-overlay mount %i
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ExecStart=/var/lib/left4me/installation/srcds_run -game left4dead2 +hostport ${L4D2_PORT} $L4D2_ARGS
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Restart=on-failure
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RestartSec=5
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# Bound the restart loop. Without these, a persistent ExecStartPre or
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# ExecStart failure spins indefinitely (default systemd has no cap when
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# Restart= is explicitly set without StartLimit*).
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StartLimitBurst=5
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StartLimitIntervalSec=60s
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# Resource control baseline — see docs/superpowers/specs/2026-05-09-l4d2-server-host-perf-baseline-design.md
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Slice=l4d2-game.slice
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Nice=-5
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IOSchedulingClass=best-effort
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IOSchedulingPriority=4
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OOMScoreAdjust=-200
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MemoryHigh=1.5G
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MemoryMax=2G
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TasksMax=256
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LimitNOFILE=65536
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KillSignal=SIGINT
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TimeoutStopSec=15s
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LogRateLimitIntervalSec=0
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# Hardening (unchanged from previous baseline).
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NoNewPrivileges=true
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PrivateTmp=true
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PrivateDevices=true
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ProtectHome=true
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ProtectSystem=strict
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ReadOnlyPaths=/var/lib/left4me/installation /var/lib/left4me/overlays
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ReadWritePaths=/var/lib/left4me/runtime/%i
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RestrictSUIDSGID=true
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LockPersonality=true
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[Install]
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WantedBy=multi-user.target
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