How to view Docker images

With the development of cloud computing technology, containerization technology has attracted more and more attention. Among them, Docker, as a popular containerization technology, has been widely used in production environments. Docker image is a very important concept. It is a file that contains all the components required for the application to run, including the operating system, application code and related library files. This article will introduce how to view Docker images.

1. Use the docker images command

The most common way to view Docker images is to use the docker images command. This command will list all the images on the Docker host, as shown below:

$ docker images

After running this command, you will see a table with information about the image, such as ID, creation time, size and Tags etc. The specific information is as follows:

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
nginx               latest              35edde41c1a0        58 seconds ago      126MB
mysql               5.7                 2d735f6b09d6        2 days ago          449MB
redis               latest              776f25c6fccf        3 days ago          106MB
hello-world         latest              bf756fb1ae65        6 months ago        13.3kB

Among them, REPOSITORY represents the warehouse name of the Docker image, and TAG represents the tag name. IMAGE ID represents the unique ID of the image, CREATED represents the creation time of the image, and SIZE represents the size of the image.

2. Use the docker search command

The docker search command can search for images in the Docker official warehouse by keywords. The usage is as follows:

$ docker search <keyword>

For example, we want to search for a name For tomcat images, you can use the following command:

$ docker search tomcat

The search results may contain many related images. Due to the large number of images in the Docker official warehouse, we can use the --filter option to narrow the search results, for example , only search for images with more than 2000 stars in the official warehouse, you can use the following command:

$ docker search --filter=stars=2000 tomcat

3. Use the docker inspect command

In addition to the docker images command, we can also use docker inspect command to view the details of the Docker image. This command returns the metadata of a specific image, such as the image's label, container, network, and mount point. The specific usage is as follows:

$ docker inspect <image_name>

For example, if we want to view the detailed information of the image named nginx, we can run the following command:

$ docker inspect nginx

This command will return a large piece of data in JSON format. It contains detailed information about the image.

4. Use the docker history command

The docker history command is used to view the history of a specific image build, including the ID, creation time, command and size of each layer and other information. The usage of this command is as follows:

$ docker history <image_name>

For example, if we want to view the history of the image named ubuntu:18.04, we can run the following command:

$ docker history ubuntu:18.04

This command will return a table containing Relevant information for each layer.

In summary, this article introduces four common methods for viewing Docker images, namely using the docker images command, docker search command, docker inspect command, and docker history command. Through these methods, we can learn the basic information, detailed information, construction history, etc. of the Docker image, which is very useful when deploying and managing Docker applications.

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