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Save, Load and Transfer Docker Image.md

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Problem Statement

One of the DevOps team members has created a custom Docker image named cluster:devops on App Server 1 in the Stratos Datacenter. The image is now saved on this server. A new requirement has been raised to use this image for testing on App Server 3. The task is to:

  1. Save the cluster:devops image as an archive on App Server 1.
  2. Transfer the image archive to App Server 3.
  3. Load the image archive on App Server 3 with the same name and tag.

Note: Docker is already installed on both servers. If the Docker service is down, ensure it is started.

Solution

1. Save the Docker Image on App Server 1

  • Log in to App Server 1 and check the existing Docker images to confirm the presence of the cluster:devops image.

    docker image list

    Expected output:

    REPOSITORY   TAG       IMAGE ID       CREATED         SIZE
cluster      devops    d5dc2018d4da   4 minutes ago   116MB
ubuntu       latest    35a88802559d   4 weeks ago     78MB

  • Save the Docker image to a tar file. This command creates a tarball of the image that can be transferred to another server.

    docker image save cluster:devops -o cluster.tar

    This will create a file named cluster.tar containing the cluster:devops Docker image.

2. Transfer the Image Archive to App Server 3

  • Copy the tar file to App Server 3 using SCP (Secure Copy Protocol). Ensure you have appropriate permissions to access /tmp on App Server 3.

    scp /home/tony/cluster.tar banner@stapp03:/tmp

    Here, /home/tony/cluster.tar is the path to the tar file on App Server 1, and /tmp is the destination path on App Server 3.

3. Load the Docker Image on App Server 3

  • Log in to App Server 3 and load the Docker image from the tar file into Docker.

    docker image load -i /tmp/cluster.tar

    This command imports the image from the tar file into Docker, making it available for use on App Server 3.

  • Verify the image on App Server 3 to ensure it has been loaded correctly.

    docker image list

    Expected output:

    REPOSITORY   TAG       IMAGE ID       CREATED         SIZE
cluster      devops    d5dc2018d4da   8 minutes ago   116MB

    The output should show the cluster:devops image with the same tag and ID as on App Server 1.