Lab #10: VOLUME instruction

Pre-requisite:

Tested Infrastructure

<table class="tg"> <tr> <th class="tg-yw4l">Platform</th> <th class="tg-yw4l">Number of Instance</th> <th class="tg-yw4l">Reading Time</th> </tr> <tr> <td class="tg-yw4l"> Play with Docker</td> <td class="tg-yw4l">1</td> <td class="tg-yw4l">5 min</td> </tr> </table>

Pre-requisite

Create an account with DockerHub
Open PWD Platform on your browser
Click on Add New Instance on the left side of the screen to bring up Alpine OS instance on the right side

Assignment

Create an image with VOLUME instruction
Finding the volume created on the host
Testing mount working as exepected

Create an image with VOLUME instruction

Dockerfile

FROM nginx:alpine
LABEL maintainer="Collabnix"

VOLUME /myvol
CMD [ "nginx","-g","daemon off;" ]

Building Docker image

$ docker build -t volume:v1 .

Create a container based on volume:v1 image

$ docker container run --rm -d --name volume-test volume:v1

Finding the volume created on the host

Checking the volume name of the container

$ docker container inspect -f '{{ (index .Mounts 0).Name }}' volume-test
ed09456a448934218f03acbdaa31f465ebbb92e0d45e8284527a2c538cc6b016

Listout Volume in the host

$ docker volume ls
DRIVER              VOLUME NAME
local               ed09456a448934218f03acbdaa31f465ebbb92e0d45e8284527a2c538cc6b016

You will see the volume has been created.

Volume mount path in host

$ docker container inspect -f '{{ (index .Mounts 0).Source }}' volume-test
/var/lib/docker/volumes/ed09456a448934218f03acbdaa31f465ebbb92e0d45e8284527a2c538cc6b016/_data

Testing mount working as exepected

Create a file in this folder

$ touch /var/lib/docker/volumes/ed09456a448934218f03acbdaa31f465ebbb92e0d45e8284527a2c538cc6b016/_data/mytestfile.txt

Checking file is there in run container

$ docker container exec -it volume-test ls myvol

Contributor

Savio Mathew

Next >> Lab #11: EXPOSE instruction