Docker volume command

In this tutorial, How to use Docker volume command to details for Data volumes. There are three main use cases for Docker data volumes:

• Keep data around when a container is removed
• To share data between the host filesystem and the Docker container
• To share data with other Docker containers

Docker volume create

The syntax docker volume commands as below:

$ docker volume create [--option] NAME_VOLUME

Related docker volume command:

• docker volume create: Create a volume docker volume inspect: Display detailed information on one or more volumes
• docker volume ls: List volumes docker volume prune: Remove all unused volumes docker
• volume rm: Remove one or more volumes

How to create a new volume and configure the container

$ docker volume create DATA
$ docker run -d -v DATA:/world centos ls /world

How to inspect container ID with docker inspect command

$ sudo docker inspect a04ae7b6cc17

For example, the output as below

"Mounts": [
 {
 "Name": "0ed908df33e1790711933ad6b463fd2a88199802c5cf2b1beb5001b81bc27750",
 "Source": "/var/lib/docker/volumes/0ed908df33e1790711933ad6b463fd2a88199802c5cf2b1beb5001b81bc27750/_data",
 "Destination": "/var/www/html",
 "Driver": "local",
 "Mode": "",
 "RW": true,
 "Propagation": ""
 },

To use docker inspect display Source and Destination for container ID

$ sudo docker inspect -f '{{ .Mounts}}' a04ae7b6cc17 | awk '{ print "Source:"$2 "\t " "Destination:"$3}'

The output below:

Source:/var/lib/docker/volumes/0ed908df33e1790711933ad6b463fd2a88199802c5cf2b1beb5001b81bc27750/_data Destination:/var/www/html

How to use docker volume ls to list all volume for container

$ sudo docker volume ls

The output as below

[sudo] password for huupv:
 DRIVER VOLUME NAME
 local 0ed908df33e1790711933ad6b463fd2a88199802c5cf2b1beb5001b81bc27750
 local 1d4c9030aea8554335b281d554a27422773f067f77ead5663e9b52f85d64ff6f
 local 387a0f11796f6d6d254abbbdf523410a42ed004dc5879c59ae45f5c922038441
 local 85621d725c9cee6444ab83162123000dd18bdd9a0a974a3cbe05b60d0175bc33
 local bbaaa1ea0d348d1e66ae6f606396502d895db8f6f2cd6f1cc9ca34605da3cf3c
 local devopsroles
 local e1f8e62ec711164a363bbc9bc53a0868e093dc7e4983fb327fe5f77b4e48d965
 local wordpress_db-data
 local wordpress_nginx-data
 local wordpress_php-data
 local wordpress_wp-data

How to use docker inspect exploit for container ID a04ae7b6cc17

$ sudo docker inspect -f '{{ (index .Mounts 0).Source }}' a04ae7b6cc17

The output Mounts source container ID a04ae7b6cc17

/var/lib/docker/volumes/0ed908df33e1790711933ad6b463fd2a88199802c5cf2b1beb5001b81bc27750/_data

Other dockers inspect command Mounts source container ID a04ae7b6cc17

$ sudo docker inspect --format '{{ range .Mounts }}{{ if eq .Destination "/var/www/html" }}{{ .Source }}{{ end }}{{ end }}' a04ae7b6cc17

How to create a Docker Volume Using a Dockerfile

$ vim Dockerfile

The content as below

# Create a volume
 VOLUME /dockerfilevolume

Next, build an image named dockerfile-volumetest from this Dockerfile with the command:

$ sudo docker build -t dockerfile-volumetest .

Then launch a container named “my-dockerfile-test” from this image with the command:

$ sudo docker run --name my-dockerfile-test -it dockerfile-volumetest /bin/bash

Detach from the container with Ctrl-p + Ctrl-q and return to the host machine’s command prompt.

Sharing Volumes Between Containers

Sharing a Volume on the Host

$ sudo mkdir /webdata
$ sudo docker run -it --name webapp -v /webdata:/var/www/html nginx /bin/bash

Using a Container as a Shared Data Volume

$ sudo docker run -it -v /shared-data --name data-storage centos /bin/bash
$ echo "Hello from the data-storage container." >> /shared-data/data-storage-hello.txt
$ sudo docker run -it --name app --volumes-from data-storage python /bin/bash

Mounting a Volume as Read-Only

$ docker run -v /directory:/path:ro
$ sudo docker volume create --name limited-access
$ sudo docker run -it --name allowed-to-write -v limited-access:/data centos /bin/bash

Conclusion

Thought the article, help you to details for data volume. Docker volume command helps useful to determine for containers. The update about docker volume command later.