Docker Prune

If you find your docker install running out of hard drive space then potentially you have a lot of left over files from previous containers. In the folder /var/lib/docker was using over 50% of my hdd space. Running the below command freed up a substantial amount of space

Run the below command to show used/free space

df -h --total

Next command will show anything in the Docker folder that is using Gigabytes of space. max-depth will search 2 directories deep in the /var/lib/docker directory. grep -E "G" searches for G letter, in this case Gigabytes.

Sudo du -cha --max-depth=2 /var/lib/docker | grep -E "G"

Finally a prune to clear out any stale data.

docker system prune -a -f