55 lines
2.6 KiB
YAML
55 lines
2.6 KiB
YAML
services:
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fleet-prometheus:
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# Pinned to the Prometheus 3.5 LTS line — NEVER :latest. The home `prom`
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# on PIHA runs :latest, which is the anti-pattern we are deliberately not
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# repeating here: a fleet liveness source must be reproducible.
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image: prom/prometheus:v3.5.0
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container_name: fleet-prometheus
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restart: unless-stopped
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command:
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- '--config.file=/etc/prometheus/prometheus.yml'
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- '--storage.tsdb.path=/prometheus'
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# Tight VPS (3.7 GiB RAM + 4 GiB swap): keep the TSDB small. Whichever
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# of time/size is hit first triggers compaction/deletion.
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- '--storage.tsdb.retention.time=15d'
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- '--storage.tsdb.retention.size=2GB'
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# Allow `POST /-/reload` so liveness rules (added in a later step) can be
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# hot-loaded without restarting and losing the scrape gap.
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- '--web.enable-lifecycle'
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volumes:
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- ./prometheus.yml:/etc/prometheus/prometheus.yml:ro
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- ./rules:/etc/prometheus/rules:ro
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- fleet_prometheus_tsdb:/prometheus
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ports:
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# tailscale-internal: the listen socket is bound ONLY to the VPS Tailscale
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# interface IP (TAILSCALE_BIND_IP), never 0.0.0.0. The port therefore does
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# not exist on the public Hetzner IP at all — reachability is enforced in
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# the bind itself (defense-in-depth), not solely by the host firewall.
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# brain-watchdog on PIHA reaches this over the VPS Tailscale IP.
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# Requires --env-file services/fleet-prometheus/.env at deploy (see README).
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# Do NOT add this to npm / public DNS.
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- "${TAILSCALE_BIND_IP}:9090:9090"
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# node_exporter on the VPS runs with network_mode: host, so it listens on
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# the host's :9100. This bridged container reaches it via host-gateway.
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extra_hosts:
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- "host.docker.internal:host-gateway"
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# Memory: VPS has 4 GiB RAM. 512m cgroup ceiling; Docker restarts the
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# container on breach. oom_score_adj is POSITIVE on purpose — fleet
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# monitoring is less critical than the control-plane (-900), so the host
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# OOM-killer should sacrifice this container FIRST, never the control-plane.
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mem_limit: 512m
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oom_score_adj: 200
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# The prom/prometheus image is busybox-based and ships `wget` (but no curl),
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# so an in-container HTTP check works here — unlike the vikunja image, which
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# had neither and broke its healthcheck permanently.
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healthcheck:
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test: ["CMD", "wget", "-q", "-O", "-", "http://localhost:9090/-/healthy"]
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interval: 30s
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timeout: 10s
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retries: 5
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start_period: 30s
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volumes:
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fleet_prometheus_tsdb:
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name: fleet-prometheus_tsdb
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