How to Commit Changes to a Docker Image

When it comes to deploying your app and the need to fix a bug or release an update arises, it’s essential to understand how to commit changes to a Docker image. This process allows you to create a new tag for an existing container.

To begin, you can obtain the ID of the running container by using the docker ps command. With the container ID in hand, you can proceed to utilize the docker commit command to create the new image tag. The following format should be used:

docker commit <id> <username>/<imagename>:<tagname>

Aside from simply creating the new tag, you also have the option of including a changelog message that specifies the alterations made in the new version. This can be accomplished as follows:

docker commit --change "description" <id> <username>/<imagename>:<tagname>

In summary, committing changes to a Docker image is a crucial step in the process of fixing bugs or releasing updates for your application. Remember to obtain the container’s ID, utilize the docker commit command with the appropriate parameters, and consider including a changelog message if necessary.