How to list image details?

Listing Image Details in Docker

Docker is a popular containerization platform that allows developers to package and deploy applications in a consistent and reproducible manner. One of the key features of Docker is the ability to manage and interact with Docker images, which serve as the foundation for running containers.

To list the details of Docker images, you can use the docker image ls command. This command will display a list of all the Docker images that are currently available on your system, along with their respective details.

Here's an example of how to use the docker image ls command:

docker image ls

This will output a table with the following columns:

REPOSITORY: The name of the image repository.
TAG: The specific tag or version of the image.
IMAGE ID: The unique identifier for the image.
CREATED: The date and time when the image was created.
SIZE: The size of the image.

You can also use additional options with the docker image ls command to customize the output and get more detailed information about your Docker images. Here are a few examples:

Display all image details:
```
docker image ls --all
```
This will display all the images, including intermediate layers and dangling images.
Filter by image name:
```
docker image ls --filter "reference=nginx"
```
This will display only the images that have "nginx" in their name.
Sort the output:
```
docker image ls --sort "creation-date"
```
This will sort the output by the creation date of the images, with the oldest image listed first.
Display the image digest:
```
docker image ls --digests
```
This will display the image digest, which is a unique identifier for the image content.
Display the image size in a more human-readable format:
```
docker image ls --format "{{.Repository}}\t{{.Tag}}\t{{.Size}}"
```
This will display the image repository, tag, and size in a more readable format.

To better understand the structure and relationships between Docker images, you can use the following Mermaid diagram:

graph TD A[Docker Image] --> B[Image Layer 1] A --> C[Image Layer 2] A --> D[Image Layer 3] B --> E[Base Image] C --> B D --> C

This diagram shows that a Docker image is composed of multiple layers, with each layer building upon the previous one. The base image forms the foundation, and subsequent layers are added to create the final image.

By understanding how to list and inspect Docker images, you can effectively manage and maintain your Docker-based applications, ensuring that you're using the correct versions of images and that your containers are running as expected.