Docker containers are read-write layers working on top of a read-only images, any changes made to a container are lost when the container is stopped or deleted. To allow data to persist between container restarts it can be stored on host’s filesystem using Docker Bind Mounts or volumes.
Docker volumes use subdirectories of the docker directory tree on host machine to store the files. This allows the data to be shared between containers and preserved between container restarts.
Working with Volumes
Volumes are managed with the docker volume command set.
Creating Volumes
docker volume create <volume_name>
The name is optional and if left empty, a random name will be generated.
List Volumes
docker volume ls
docker volume ls -f name=<name>
Remove Volume
docker volume rm <volume_name> - removes specified volume
docker volume prune - remove all unused volumes