Docker remove ALL volumes not attached

Docker can be tricky to debug. There's instances where after upgrading a container the volume that was previously attached fails to work.

In this case it was a dev image and the quickest, and dirtiest, option was to clear out and rebuild. I could go one by one to delete the specific volumes.

docker volume ls  
docker volume rm {specific\_docker\_container}  

Instead I chose to delete all volumes not currently in use. This worked for my use case as I only have two dockers setups, left the one I wanted to keep running while executing the following commands.

docker volume rm \`docker volume ls -q -f dangling=true\`