# Quadlet unit: blackbox exporter (rootless, host network, boot-persistent).
#
# Install path on dankclaw:
#   ~/.config/containers/systemd/blackbox-exporter.container
#
# WHY Network=host. The probes it runs are (a) the host's own LAN IP
# (192.168.0.143:8081 SearXNG, :3005 OpenWebUI — host-process/portmap binds a
# bridge container cannot reach; netavark DNATs published ports only, see
# Container Host Reachability in the vault) and (b) ComfyUI's published port
# via 127.0.0.1 (rootless --network=host shares the real host netns, so the
# 0.0.0.0:8188 publish answers on loopback). A bridge-networked prober could
# reach neither class reliably.
#
# WHY the listener binds 127.0.0.1 + LAN. A bridge container CANNOT dial
# its own host's LAN IP (netavark hairpin gap, measured 2026-10-21), but a
# bridge container dialing the podman gateway 169.254.1.2 lands on the host
# LOOPBACK — that is the scrape path, and it needs this exporter to be
# LISTENING ON LOOPBACK (proved: 200 from the prometheus container to
# http://169.254.1.2:9115/-/healthy with a loopback bind). The gateway
# address itself is NOT bindable from the host netns — it exists only
# inside each rootless netns; binding it dies "bind: cannot assign
# requested address" (live 2026-10-21). The LAN bind stays for diagnostics.
# No public DNS name, no guard chain: internal net only, per the exposure
# policy. The listen flag is --web.listen-address and it is REPEATABLE, one
# flag per bind; plain --listen-address does not exist and the exporter
# exits in 100 ms with "unknown long flag" (live 2026-10-21).

[Unit]
Description=Blackbox exporter (HTTP probe prober)
After=network-online.target

[Container]
Image=docker.io/prom/blackbox-exporter@sha256:ea1c7aa3ef3f307cd03e85f34abb604478ccb90b567fc690da0cd9776da76b13
ContainerName=blackbox-exporter
Network=host
# The image's ENTRYPOINT is /bin/blackbox_exporter itself (proved live
# 2026-10-21: `podman run IMAGE sh` dies "unexpected sh"), so Exec= carries
# FLAGS ONLY — repeating the binary makes it a positional arg and kingpin
# exits "unexpected /bin/blackbox_exporter".
Exec=--config.file=/etc/blackbox_exporter/config.yml --web.listen-address=127.0.0.1:9115 --web.listen-address=192.168.0.143:9115
Volume=/opt/blackbox/blackbox.yml:/etc/blackbox_exporter/config.yml:ro
# Plain exec form like every sibling unit. Shell form (`/bin/sh -c "…"`)
# is passed as one quoted token and quadlet then folds the following
# --health-interval/--health-retries (and the image name) into the command
# string — unit died twice that way, live 2026-10-21. wget only; this
# busybox variant has no curl, and host-network wget answers on loopback.
HealthCmd=wget -q -O /dev/null http://127.0.0.1:9115/-/healthy
HealthInterval=30s
HealthRetries=3

[Service]
Restart=always
RestartSec=5

[Install]
WantedBy=default.target