57 lines
1.5 KiB
Bash
57 lines
1.5 KiB
Bash
#!/bin/sh
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set -eu
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WATCH_CONTAINER="${WATCH_CONTAINER:?set WATCH_CONTAINER to the container name or id to watch}"
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RESTART_CONTAINERS="${RESTART_CONTAINERS:?set RESTART_CONTAINERS to a comma-separated list of containers to restart}"
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POLL_INTERVAL="${POLL_INTERVAL:-30}"
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# Only restart when status *becomes* unhealthy (avoids restarting every poll while still unhealthy).
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# Set RESTART_ON_EVERY_POLL=1 to restart on every poll while unhealthy.
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RESTART_ON_EVERY_POLL="${RESTART_ON_EVERY_POLL:-0}"
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log() {
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printf '%s %s\n' "$(date '+%Y-%m-%dT%H:%M:%S')" "$*"
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}
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inspect_health() {
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docker inspect --format '{{if .State.Health}}{{.State.Health.Status}}{{else}}none{{end}}' "$1" 2>/dev/null || printf 'missing'
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}
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restart_list() (
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IFS=','
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for c in $RESTART_CONTAINERS; do
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c=$(echo "$c" | sed 's/^[[:space:]]*//;s/[[:space:]]*$//')
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[ -z "$c" ] && continue
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if docker restart "$c" 2>/dev/null; then
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log "restarted: $c"
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else
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log "restart failed: $c"
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fi
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done
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)
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prev=""
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log "watching health of: $WATCH_CONTAINER (interval ${POLL_INTERVAL}s)"
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log "will restart on unhealthy: $RESTART_CONTAINERS"
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while true; do
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status="$(inspect_health "$WATCH_CONTAINER")"
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case "$status" in
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missing)
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log "watch target not found: $WATCH_CONTAINER"
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;;
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unhealthy)
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if [ "$RESTART_ON_EVERY_POLL" = "1" ] || [ "$prev" != "unhealthy" ]; then
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log "unhealthy — restarting configured containers"
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restart_list
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fi
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;;
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*)
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;;
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esac
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prev="$status"
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sleep "$POLL_INTERVAL"
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done
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