519567e156
The lifecycle change to systemctl enable --now (commit 8552c55) made
units auto-start at boot. But the kernel-overlayfs mount is volatile
(reboot kills it), and the web app's start_instance only re-mounts in
response to a UI click. Result: at boot, systemd starts the unit, finds
empty merged/, CHDIR fails, Restart=on-failure spins forever (counter
hit 65 on ckn before this fix landed).
Fix:
- Unit gets `ExecStartPre=/usr/bin/sudo -n .../left4me-overlay mount %i`
so the overlay is established before the main process starts.
- Helper is now idempotent: if merged is already a mount point, exit 0.
Required because Restart=on-failure re-runs ExecStartPre on each
cycle, and the web-app's start_instance also calls the helper, so
both paths would otherwise collide on "already mounted".
- StartLimitBurst=5 + StartLimitIntervalSec=60s caps the restart loop
instead of letting it spin indefinitely on a fundamental failure.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
52 lines
1.6 KiB
Desktop File
52 lines
1.6 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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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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