services/watchtower/docker-compose.yml

@@ -11,11 +11,9 @@ services:
     hostname: watchtower
     domainname: ${BASE_DOMAIN}
     environment:
-      # for testing:
-      - WATCHTOWER_MONITOR_ONLY=true
-
       - TZ=${TIMEZONE}
       - WATCHTOWER_SCHEDULE=0 0 4 * * *
+      - WATCHTOWER_CLEANUP="true"
 
       - WATCHTOWER_NOTIFICATIONS=email
       - WATCHTOWER_NOTIFICATION_EMAIL_FROM=watchtower@${BASE_DOMAIN}

setup/alpine-setup.md

@@ -192,3 +192,9 @@ https://wiki.alpinelinux.org/wiki/Docker
 rc-update add docker
 service docker start
 ```
+
+### cron
+
+```sh
+cp -r /opt/container-server/setup/cron/* /etc/periodic/
+```

setup/cron/weekly/docker-prune

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+docker system prune --all --volumes --force | tail -n 1 && df -h | grep -v overlay