Create a Docker Image From Container.md

Problem Statement

A Nautilus developer needs to back up changes made to a container as part of their testing process. The DevOps team has been requested to create a new Docker image based on these changes. Specifically, you need to create an image named games:nautilus from the ubuntu_latest container that is running on Application Server 2.

Solution

To create a Docker image from the modified container and back up its changes, follow these steps:

1. List Running Containers

   First, identify the container you want to create an image from by listing all running containers. Use the docker container ls command to view active containers and their IDs.

   docker container ls

2. Create a New Image from the Container

   Once you have the container ID (e.g., 164a6eba532f), use the docker container commit command to create a new image. This command captures the current state of the container and creates a new image with the specified name and tag.

   docker container commit 164a6eba532f games:nautilus

   Here, 164a6eba532f is the container ID, and games:nautilus is the name and tag for the new image.

3. Verify the New Image

   After creating the image, confirm that it has been successfully created by listing all available Docker images. Use the docker images command to check for the presence of the newly created image.

   docker images

   Expected output:

   REPOSITORY   TAG        IMAGE ID       CREATED         SIZE
   games        nautilus   d40de38957ad   6 seconds ago   115MB
   ubuntu       latest     35a88802559d   4 weeks ago     78MB
   

   This output shows the games:nautilus image along with its ID and creation timestamp, indicating that the image was created successfully.