[OCS-gw] Docker is using up diskspace on GCE host

[ostelco]

[OCS-gw] Docker is using up diskspace on GCE host

[mpeterss]

Plan is to add a Cron Job on the WM that will prune all docker images not in use once a day.

[mpeterss]

Most likely we will do:

docker system prune -a --volumes

This will get rid of everything not in use. So it will also delete gcr.io/google-containers/toolbox image which is a bit annoying.

[mpeterss]

Container-Optimized OS does not have crontab installed

[mpeterss]

https://www.cloudesire.com/automatically-remove-unused-docker-data-with-systemd/

[mpeterss]

Maybe just solve it with a startup script.

https://cloud.google.com/compute/docs/startupscript

[mpeterss]

#726

I have created script that will use systemd to prune Docker images each day. The script is stored in a storage bucket in GCP and transferred using metadata tag "startup-script-url" to the GCE on startup of WM.