Docker registry garbage collection with container start/stop

registry-gc.sh

#!/bin/sh
# registry-gc.sh
# Stop registry -> run GC -> start registry (safe for docker distribution registry)

set -eu

COMPOSE_DIR="/path/to/compose"
SERVICE="registry"
CONFIG_IN_CONTAINER="/etc/docker/registry/config.yml"
LOG_FILE="/var/log/registry-gc.log"

cd "$COMPOSE_DIR"

ts() { date "+%Y-%m-%d %H:%M:%S"; }

{
  echo "[$(ts)] Starting registry GC"

  echo "[$(ts)] Stopping ${SERVICE}"
  docker-compose stop "$SERVICE"

  echo "[$(ts)] Running garbage-collect"
  docker-compose run --rm "$SERVICE" registry garbage-collect "$CONFIG_IN_CONTAINER"

  echo "[$(ts)] Starting ${SERVICE}"
  docker-compose start "$SERVICE"

  echo "[$(ts)] Done"
} >>"$LOG_FILE" 2>&1