Frank
4009f118c1
Third boot failure: the exporter exited 100 ms in with 'unknown long flag --listen-address' (proved against the pinned image, plus --help). The bind semantics were right; the flag name was invented. --web.listen-address is repeatable - one per address - so the dual gateway+LAN bind stands. Proven again pre-deploy with the real argv: the run starts and dies only on the deliberate /dev/null placeholder config.
47 lines
2.1 KiB
INI
47 lines
2.1 KiB
INI
# Quadlet unit: blackbox exporter (rootless, host network, boot-persistent).
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#
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# Install path on dankclaw:
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# ~/.config/containers/systemd/blackbox-exporter.container
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#
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# WHY Network=host. The probes it runs are (a) the host's own LAN IP
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# (192.168.0.143:8081 SearXNG, :3005 OpenWebUI — host-process/portmap binds a
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# bridge container cannot reach; netavark DNATs published ports only, see
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# Container Host Reachability in the vault) and (b) ComfyUI's published port
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# via 127.0.0.1 (rootless --network=host shares the real host netns, so the
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# 0.0.0.0:8188 publish answers on loopback). A bridge-networked prober could
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# reach neither class reliably.
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#
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# WHY the listener binds TWO addresses. The netavark hairpin gap (measured
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# 2026-10-21, cadvisor job comment): a BRIDGE CONTAINER CANNOT DIAL ITS OWN
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# HOST'S LAN IP at all — so a LAN-only bind is unscrapable by Prometheus,
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# whatever the signal-relay law suggests for services containers dial as
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# clients. The podman gateway (169.254.1.2 = host.containers.internal) is the
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# address bridge containers reach same-host targets at, so the exporter binds
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# it explicitly for the scrape rather than relying on loopback-forwarding
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# semantics, and keeps the LAN bind for diagnostics. No public DNS name, no
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# guard chain: internal net only, per the exposure policy. The listen flag is
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# --web.listen-address and it is REPEATABLE, one flag per bind; plain
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# --listen-address does not exist and the exporter exits in 100 ms with
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# "unknown long flag" (live 2026-10-21).
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[Unit]
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Description=Blackbox exporter (HTTP probe prober)
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After=network-online.target
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[Container]
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Image=docker.io/prom/blackbox-exporter@sha256:ea1c7aa3ef3f307cd03e85f34abb604478ccb90b567fc690da0cd9776da76b13
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ContainerName=blackbox-exporter
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Network=host
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Exec=/bin/blackbox_exporter --config.file=/etc/blackbox_exporter/config.yml --web.listen-address=192.168.0.143:9115 --web.listen-address=169.254.1.2:9115
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Volume=/opt/blackbox/blackbox.yml:/etc/blackbox_exporter/config.yml:ro
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HealthCmd=/bin/sh -c "wget -q -O /dev/null http://169.254.1.2:9115/-/healthy || exit 1"
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HealthInterval=30s
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HealthRetries=3
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[Service]
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Restart=always
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RestartSec=5
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[Install]
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WantedBy=default.target
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