creating-volume-mount-from-dockercli.md

Creating Volume Mount from docker run command & sharing same Volume Mounts among multiple containers

Tested Infrastructure

Platform	Number of Instance	Reading Time
Play with Docker	1	5 min

Pre-requisite

• Create an account with DockerHub
• Open PWD Platform on your browser
• Click on "Add New Node"

Volumes can be shared across containers

Preparations

• Clean your docker host using the commands :

$ docker rm -f $(docker ps -a -q)

$ docker volume rm $(docker volume ls -q)

Task

1. The Task for this lab is to create a volume, call it my_volume.

2. you should than run a simple an thin container and attach a volume to it. use the image selaworkshops/busybox:latest and use any name to the mounted volume directory (e.g : data)

3. change something in the volume folder , e.g : add a file with some content.

4. create a second volume mounted to the same volume , make sure the file you created in step 3 exists !

Instructions

• Display existing volumes:

$ docker volume ls

• Create a new volume:

$ docker volume create my-volume

• Inspect the new volume to find the mountpoint (volume location):

$ docker volume inspect my-volume

[
    {
        "CreatedAt": "2018-06-13T20:36:15Z",
        "Driver": "local",
        "Labels": {},
        "Mountpoint": "/var/lib/docker/volumes/my-volume/_data",
        "Name": "my-volume",
        "Options": {},
        "Scope": "local"
    }
]

• Let's run a container and mount the created volume to the root:

$ docker run -it -v my-volume:/data --name my-container selaworkshops/busybox:latest

• Create a new file under /data:

$ cd /data
$ echo "hello" > hello.txt
$ ls

• Open other terminal instance and run other container with the same volume:

$ docker run -it -v my-volume:/data --name my-container-2 selaworkshops/busybox:latest

• Inspect the /data folder (the created file will be there):

$ cd data
$ ls

• Exit from both containers and delete them:

$ exit
$ docker rm -f my-container my-container-2

• Ensure the containers were deleted

$ docker ps -a

• Run a new container attaching the created volume:

$ docker run -it -v my-volume:/data --name new-container selaworkshops/busybox:latest

• Inspect the /data folder (the created file will be there):

$ cd data
$ ls

• Exit from the container and delete it:

$ exit
$ docker rm -f new-container

Next >> The docker network Command