docker:tldr:9277f

The docker tag command is used to add a new name and/or tag to an existing image in Docker. It allows you to create an alias or make a copy of an image with a different name or tag.

The syntax for the docker tag command is as follows:

docker tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]

Here, SOURCE_IMAGE refers to the image you want to tag, and TARGET_IMAGE refers to the new name and/or tag you want to assign to the image.

For example, suppose you have an image called myimage that currently has the latest tag. You can tag it with a new name and a different tag using the docker tag command like this:

docker tag myimage:latest newimage:1.0

This will create a new image called newimage with the tag 1.0, which is essentially a copy of the original image.

You can also use the docker tag command to create multiple tags for the same image. For instance:

docker tag myimage:latest myimage:2.0

This will add a new tag (2.0) to the existing image (myimage), so you can refer to it using either tag.

Tags serve as human-readable labels to identify or version your images. They can help manage different versions of the same image or facilitate deployment to different environments.