CompTIA Linux+ XK0-005 - 3.2 - Container Image Operations: List

The Docker container image list operation allows you to view the list of locally available container images on your Docker host. This guide will provide an overview of the docker image ls command, its purpose, and how to use it effectively to list Docker container images.

Purpose and Overview

When working with Docker, it's important to have visibility into the container images available on your local machine. The list operation provides you with an overview of the container images that are already pulled and stored locally. This information is useful for managing and organizing your container images, as well as ensuring you have the necessary images for running containers.

Usage

To list Docker container images, you can use the docker image ls command. Here are some examples of how to use the command along with its options:

Basic Usage:
```
docker image ls
```
This command lists all the container images available on your Docker host, along with their repository, tag, image ID, and size.
Filtering by Repository:
```
docker image ls repository_name
```
Use this command to list images belonging to a specific repository. Replace repository_name with the name of the repository you want to filter by.
Filtering by Tag:
```
docker image ls repository_name:tag
```
This command lists images with a specific tag from a given repository. Replace repository_name with the repository name and tag with the desired tag.
Displaying Digest:
```
docker image ls --digests
```
By adding the --digests option, the command displays the image digest along with other details.

Usage Examples

Here are some real-world examples of using the docker image ls command to list Docker container images:

Listing all available images:
```
docker image ls
```

Filtering images by repository:

docker image ls docker.io/library/nginx

Filtering images by tag:
```
docker image ls nginx:latest
```
Displaying image digests:
```
docker image ls --digests
```

Conclusion

The docker image ls command is a valuable tool for listing Docker container images on your local machine. By using this command and its options, you can obtain an overview of the images available, filter them based on repository or tag, and display additional details such as image digests.

In this guide, we covered the basic usage of the docker image ls command and explored different options for filtering and displaying image information. By leveraging this knowledge, you can effectively manage your Docker container images, ensure you have the necessary images for running containers, and organize your image repository efficiently.

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