Docker local repository watcher

• Can prune all docker instances
• Can watch repository and delete stale images
• Can update self docker container with new image
• Can remove stale images from docker registry on the same host

• docker pull freundallein/drwatcher:latest
• docker run -d -v /var/run/docker.sock:/var/run/docker.sock freundallein/drwatcher:latest

Starts docker prune crontb jobs with CRONTAB period.
Start custom image cleaning job,
for example your app image is 192.168.1.50:5000/custom-app and you want to store only 5 images from

192.168.1.50:5000/custom-app:2019-01-01.1
192.168.1.50:5000/custom-app:2019-01-01.2
192.168.1.50:5000/custom-app:2019-01-01.3
192.168.1.50:5000/custom-app:2019-01-01.4
192.168.1.50:5000/custom-app:2019-01-01.5
192.168.1.50:5000/custom-app:2019-01-01.6
192.168.1.50:5000/custom-app:2019-01-01.latest

So, drwatcher will check your local repository and remove stale images.
After one iteration with IMAGE_AMOUNT=5 your repository would look like this

192.168.1.50:5000/custom-app:2019-01-01.3
192.168.1.50:5000/custom-app:2019-01-01.4
192.168.1.50:5000/custom-app:2019-01-01.5
192.168.1.50:5000/custom-app:2019-01-01.6
192.168.1.50:5000/custom-app:2019-01-01.latest

Also, if you want to clean images form docker registry (on the same host),
you should pass -v /your/regitry/path:$REGISTRY_PATH and set CLEAN_REGISTRY=1.
Drwather will discover /_manifests/tags/ and /_manifests/revisions/,
decide what revisions and tags should be deleted, will delete it,
then will call registry garbage collect.

• REGISTRY_IP=192.168.1.50
• REGISTRY_PORT=5000
• APP_PREFIX="custom-app" (prefix of custom application)
• CRONTAB="* * * * * *" (starts with seconds)
• LOG_LEVEL=DEBUG (or ERROR)
• PERIOD=60 (Period of custom image cleaning in seconds)
• IMAGE_AMOUNT=5 (amount of custom images to stay)
• AUTOUPDATE=1 (if you want autoupdate drwatcher)
• CLEAN_REGISTRY=1 (if you want to clean your registry)
• REGISTRY_PATH=/var/lib/registry