Detailed explanation of how docker renames images

Docker is an open source application container engine that allows developers to package applications and their dependencies into portable containers. This approach allows applications to run anywhere without requiring code modifications. Docker images are templates used to create containers. One image can create many containers. If you want to rename a Docker image, the following article details how to accomplish this task.

Method 1: Use the tag command

The Tag command can mark an existing image with another name (an alias). The following is the simplest way to rename the image:

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

Among them, SOURCE_IMAGE is the name of the existing image, TAG is the tag of the image, and TARGET_IMAGE is the name of the renamed image. If the TAG parameter is not specified, it defaults to "latest", indicating the latest version. Here is an example of how to rename the image myimage:v1 to myimage2:v2:

docker tag myimage:v1 myimage2:v2

To list all available images, use the following command:

docker images

Method 2: Via the build command

If you want to use another name to build an image, you can use the following command:

docker build -t new_image_name:tag .

Where, new_image_name is the name you want to specify for the new image, and tag is the image. Label, the last character dot (.) indicates using the Dockerfile file in the current directory. The following is an example of creating a Dockerfile in the current directory as a new name myimage2:

docker build -t myimage2 .

Method 3: Through the rename command

Docker 1.13 and later versions support the use of the docker rename command, this command You can modify the name of an existing container or image to a specified name. An example of using this command to rename an image:

docker rename old_name new_name

where old_name is the name of the current image and new_name is the name you want to give the new image. The following is an example of renaming the Docker image myimage to myimage2:

docker rename myimage myimage2

If you need to list all available images, you can use the following command:

docker images

Summary

Docker Is a popular technology for building and deploying containerized applications. Docker images are the basis for building containers, and you can rename them in a variety of ways. In this article, we introduced three methods to rename a Docker image: through the tag command, through the build command, and using the rename command. Each method has its advantages and disadvantages, and you can choose the method that suits you based on your needs.

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