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Docker Update Permissions.md

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Problem Statement

A developer named rose needs to run Docker commands on App Server 2 in the Stratos Datacenter. The user rose is already created on the server but is currently unable to execute Docker commands without using sudo. You need to make the necessary changes to allow this user to run Docker commands directly.

Solution

To enable the user rose to run Docker commands without sudo, follow these steps:

  1. Check for the Docker Group

    First, ensure that the Docker group exists on the server. The Docker group allows users to run Docker commands without requiring root privileges.

    groupadd docker

    If the Docker group already exists, this command will have no effect. If it doesn’t exist, this command will create it.

  2. Add the User to the Docker Group

    Add the user rose to the Docker group. This grants the user the necessary permissions to run Docker commands without sudo.

    gpasswd -a rose docker

    This command modifies the group membership for rose, adding them to the docker group.

  3. Switch to the User rose

    After adding rose to the Docker group, switch to the rose user account to verify the changes.

    su rose

    You will need the password for the rose user to switch to their account.

  4. Verify Docker Command Execution

    As the rose user, check if Docker commands can be executed without sudo. You can test this by listing Docker images or pulling a Docker image.

    • List Docker Images:

      docker image ls -a

      Expected output (example):

      REPOSITORY   TAG       IMAGE ID   CREATED   SIZE

    • Pull a Docker Image:

      docker pull nginx

      Expected output (example):

      Using default tag: latest
latest: Pulling from library/nginx
f11c1adaa26e: Pull complete 
c6b156574604: Pull complete 
ea5d7144c337: Pull complete 
1bbcb9df2c93: Pull complete 
537a6cfe3404: Pull complete 
767bff2cc03e: Pull complete 
adc73cb74f25: Pull complete 
Digest: sha256:67682bda769fae1ccf5183192b8daf37b64cae99c6c3302650f6f8bf5f0f95df
Status: Downloaded newer image for nginx:latest
docker.io/library/nginx:latest