Automate docker system prune

Running my docker swarm and experimenting with new things creates a lot of technical debt in the form of unused images, volumes and networks.

log into your primary node and run the following command

Docker system prune - a -f

This will go through all the container, images (dangling and otherwise) , Volumes and networks. The command will not require interaction.

Since this should be done frequently it makes sense to automate.

go to

cd /etc/cron.weekly

then type this line

crontab -e

this will open a crontab file. Scroll to the bottom and add

0 0 * * 0 docker system prune -a -f

save the file by typing

control o then enter, then control x

This will run the command once a week at Sunday, midnight.