How do I make docker data persistent using volumes?

petulia3478

To make docker persistent, docker containers use volumes.

This command will create a container with a volume, and touch a file in that volume.

 $ docker run --name training -v /trainingdocs alpine touch /trainingdocs/class1

You can inspect the container using the inspect command: first get the container id.

$ docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                     PORTS               NAMES
23f00b24aa59        alpine              "touch /trainingdo..."   5 seconds ago       Exited (0) 5 seconds ago                       training

Inspect the container. List just the Mounts section.

       "Mounts": [
            {
                "Type": "volume",
                "Name": "af5f9fd9cb153f5e9554aaba4e7428283d42fc2307ae2df84b387739a91ee09d",
                "Source": "/var/lib/docker/volumes/af5f9fd9cb153f5e9554aaba4e7428283d42fc2307ae2df84b387739a91ee09d/_data",
                "Destination": "/trainingdocs",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],

List your file in the volume.

sudo ls /var/lib/docker/volumes/af5f9fd9cb153f5e9554aaba4e7428283d42fc2307ae2df84b387739a91ee09d/_data
class1