How to delete docker image

Docker is one of the most popular containerization technologies currently. As a lightweight, portable and self-contained container application environment, Docker makes application development, testing and deployment easier and more efficient. In Docker, image is a very important concept, which is the basis of Docker container applications. This article will introduce how to delete Docker image.

1. View existing Docker images

Before deleting the Docker image, we need to first understand what images we already have. All Docker images in the current system can be listed through the command docker images. After executing this command, the relevant information of the image will be listed, such as REPOSITORY, TAG, IMAGE ID, CREATED, etc. Among them, REPOSITORY indicates which warehouse this Docker image belongs to, and TAG indicates the version of this Docker image.

2. Delete a single Docker image

Deleting a single Docker image is very simple, just use the docker rmi command. The command format is as follows:

docker rmi [OPTIONS] IMAGE [IMAGE...]

Among them, IMAGE represents the ID or name of the Docker image to be deleted, and OPTIONS represents the deletion options. If OPTIONS is not specified, the default options will be used.

For example, assuming we want to delete the Docker image whose REPOSITORY is nginx and TAG is latest, we can execute the following command:

docker rmi nginx:latest

After executing this command, the system will delete the Docker image.

3. Delete Docker images in batches

When we need to delete multiple Docker images, we can use the batch deletion option of the docker rmi command. The command format is as follows:

docker rmi [OPTIONS] $(docker images -q IMAGE [IMAGE...])

Among them, IMAGE represents the ID or name of the Docker image to be deleted, and OPTIONS represents the deletion options. $(docker images -q IMAGE [IMAGE...]) means passing IMAGE as a parameter to the docker images command, returning a list of image IDs, and then passing this list as a parameter to the docker rmi command.

For example, assuming we want to delete the Docker image whose REPOSITORY is redis and TAG is 5.0.5 and 5.0.6, we can execute the following command:

docker rmi $(docker images -q redis:5.0.5 redis:5.0.6)

After executing this command, the system will delete it The specified Docker image.

4. Delete unused Docker images

In the process of using Docker, we may leave some unused Docker images, which may have been built or downloaded before , but was not called in subsequent uses. These unused Docker images will occupy the system's storage space and affect system performance. Therefore, we need to delete these unused Docker images.

The docker system prune command can be used to clear unused Docker images, containers, volumes, and networks. Among them, the --all option can clear all unused Docker images. The command format is as follows:

docker system prune [OPTIONS]

For example, we can use the following command to clear all unused Docker images:

docker system prune --all

After executing this command, the system will clear all unused Docker images.

Summary

This article introduces how to delete Docker images, including deleting a single Docker image, deleting Docker images in batches, and deleting unused Docker images. By learning these methods, we can help us better manage Docker container applications and improve application performance and reliability.

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