Wt is Docker volume - amresh087/newronaRepos GitHub Wiki

Volumes are the preferred mechanism for persisting data generated by and used by Docker container

Use of Volume

Decoupling container from storage. Shared volume (storage/data) among diff container and attach volume to container. If any time deleting container but volume does not delete.

docker volume --help
docker volume create

This is use for create volume in docker
docker volume ls

This is use for show list of volume
docker volume inspect

This is use for display internal details in volume
docker volume rm

This is use for rm volume from docker

docker volume prune

This is use for remove unused volume in docker

            docker volume  create myvolume1

            docker volume ls

            docker volume inspect myvolume1

            docker volume rm myvolume1

            docker volume prune

Now for example pull Jenkins and run diff container and uses same volume.

docker pull jenkins

docker run --name myjenkins1 -v myvolume1:/var/jenkins_home -p 2019:8080 -p 5000:5000 jenkins

In this command --name myjenkins1 is used for giving the name of container

-v is used for volume its take two arguments source:destination here myvolume1 is source and /var/jenkins_home is destination

you can get jenkins storage directory data from dockerhub in jenkins image

-p 2019:8080

here 8080 is port of docker server port and exposing 2019 (localhost)

-p 5000:5000

here 5000 in jenkins API port and expose also on same port

Now you can access with public ip and port

http://18.191.149.29:2019/

After when you start jenkins on docker in console display that is Admin pass after you can set your user and pass

37c7438c6c9f444ebd5e40e92c03a907

Now you create one job Testjob in Jenkins

Now run another jenkins container for sharing volume

docker run --name myjenkins2 -v myvolume1:/var/jenkins_home -p 2020:8080 -p 6000:5000 jenkins

Now you can access http://18.191.149.29:2020/ here you can see one job already created called Testjob

Bind mount

Mean you can use physical location instead of volume

Now first create directory and give permission

sudo chmod 777 *

docker run --name myjenkins3 -v /home/ubuntu/jenkins:/var/jenkins_home -p 2021:8080 -p 7000:5000 jenkins

Now you can go to /home/ubuntu/jenkins and see the data are created