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oikos/scripts/check-caddy-backends.sh

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#!/bin/bash
# check-caddy-backends.sh — validate all Caddy reverse_proxy targets are reachable
# Run this on hubris (192.168.8.77) or any host on the homelab LAN.
# Returns non-zero if any backend is unreachable.
set -o pipefail
CADDY_HOST="192.168.8.175"
echo "=== Caddy backend connectivity check ==="
echo "Date: $(date)"
echo ""
TMPFILE=$(mktemp /tmp/caddy-checks.XXXXXX)
trap "rm -f $TMPFILE" EXIT
# Extract unique IP:port targets from Caddyfile
ssh root@"$CADDY_HOST" "grep reverse_proxy /etc/caddy/Caddyfile \
| grep -oP '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}:\d+' \
| sort -u" > "$TMPFILE"
TOTAL=0
FAILED=0
while read -r target; do
[ -z "$target" ] && continue
TOTAL=$((TOTAL + 1))
ip_port=(${target//:/ })
if timeout 3 bash -c "echo >/dev/tcp/${ip_port[0]}/${ip_port[1]}" 2>/dev/null; then
echo "$target"
else
echo "$target — unreachable"
FAILED=$((FAILED + 1))
fi
done < "$TMPFILE"
echo ""
echo "Checked $TOTAL targets, $FAILED failures"
exit $FAILED