docker volumes

#list all volumes
docker volume ls | awk '{if(NR>1) print $2}' | sort > all_volumes

#list currently used volumes
docker ps -a | awk '{if(NR>1)print $1}' | xargs docker inspect | tr -d '\n' | grep -Po '"Mounts":.*?[^\\]",' | awk '/Name/ {print $5}' | tr -d '"' | tr -d ',' > used_volumes

#remove unused volumes
diff used_volumes all_volumes  --suppress-common-lines | grep '>' | awk '{print $2}' | xargs docker volume rm

Snippets for listing docker volumes

• The first command will create a file named "all_volumes" with all the volumes hashes, each in one line, sorted
• The second command will create a file named "used_volumes" with the volumes used by the current docker machines, sorted
• The third command will remove the unused volumes by making a diff between the files

You should not do this unless you're sure about what you're doing. You will lose the data of you containers.