3d9a08d0be
flyedge.service runs /opt/fly/current/fly-edge After= and Requires= flysim.service, with its metrics on loopback :9102 and a ConditionPathExists so a release without the binary leaves it inactive. It is in no target and 07-enable.sh does not enable it; the header has the switch and the way back. build-flysim.sh also builds fly-edge beside the flysim binary and package-release.sh ships it when present. 05-deploy.sh writes FLY_FEED_VIA (default direct) into fly.env, flysim.service names FLY_BUS_DIR=/run/fly/bus and tmpfiles creates it. Watchdog check 2 reads the feed counters from whoever serves the feed: flyedge when fly.env says bus. lint.sh holds all of that, and drives check 2's choice against a fixture.
56 lines
2.7 KiB
Desktop File
56 lines
2.7 KiB
Desktop File
# infra/units/flyedge.service — pushed to /etc/systemd/system/flyedge.service.
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#
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# The feed WebSocket served from flysim's feed bus (docs/design/flybus.md,
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# "Feed over the bus"; services/flysim/crates/fly-edge). DISABLED BY DEFAULT:
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# it is in no target's Wants=/Requires= and 07-enable.sh does not enable it.
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# With FLY_FEED_VIA=direct (the default, written into /etc/fly/fly.env by
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# 05-deploy.sh) flysim binds 127.0.0.1:7400 itself and this unit has nothing
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# to do. To move the feed onto the bus on one container:
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#
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# 1. FLY_FEED_VIA=bus in the env file, then 05-deploy.sh (rewrites fly.env);
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# 2. systemctl enable --now flyedge.service; systemctl restart flysim.service
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# (flysim stops binding :7400, the edge binds it once the first snapshot
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# is on the bus);
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# 3. nothing for the watchdog: check 2 reads FLY_FEED_VIA from fly.env and
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# follows the feed counters to this unit's loopback /metrics.
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#
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# Back: FLY_FEED_VIA=direct, deploy, systemctl disable --now flyedge.service,
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# restart flysim.
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#
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# Ordering (docs/design/flybus.md, amendment "Feed store lifecycle"): flysim
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# owns the router and its store under /run/fly/bus, so it starts first and
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# the edge follows it. Requires= makes an explicit stop or restart of flysim
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# (the unstick rule's `systemctl restart flysim.service` included) stop or
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# restart the edge with it. A crash-restart of flysim is covered by the edge
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# itself: it drops its clients, unbinds :7400 and reconnects every 500 ms,
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# so nothing here has to be restarted by hand. The edge holds no state; the
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# store is flysim's and a new router removes the previous one's directory.
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[Unit]
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Description=flyedge: the feed WebSocket served from flysim's feed bus
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After=flysim.service
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Requires=flysim.service
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# A release that predates fly-edge has no binary; stay cleanly inactive
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# rather than restart-looping (the flybridge.service header explains why a
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# Condition, not a start limit).
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ConditionPathExists=/opt/fly/current/fly-edge
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[Service]
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Type=simple
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User=fly
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# FLY_FEED_VIA, FLY_BUS_DIR and the rest of flysim's configuration: the edge
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# reads the same file so the two cannot disagree about the port or the bus.
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EnvironmentFile=/etc/fly/fly.env
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Environment=FLY_FEED_BIND=127.0.0.1:7400
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Environment=FLY_BUS_DIR=/run/fly/bus
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# Its own read-only /metrics and /healthz, for watchdog check 2 in bus mode.
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# Loopback only: nothing off the container needs the edge's counters.
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Environment=FLY_EDGE_METRICS_ADDR=127.0.0.1:9102
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ExecStart=/opt/fly/current/fly-edge
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Restart=always
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RestartSec=2
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# A few snapshots in flight and a WebSocket per client; the store itself is
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# flysim's (tmpfs, bounded by feedbus::limits at 32 MiB).
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MemoryMax=256M
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[Install]
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WantedBy=fly.target
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