This post will cover topic related to ‘Managing Docker Image Manifests and Lists’ with multiple docker command examples and different scenerios. So this will help you to understand the command docker and options available in it. Also this post will explain you how to use docker command.
When working with Docker, the docker manifest command plays a crucial role in managing Docker image manifests and lists. The manifest command allows users to inspect and manipulate image manifests, which are JSON metadata files that describe the configuration and layers of a Docker image.
Here are several examples demonstrating how to use the docker manifest command:
Example 1: Inspecting a Docker Image Manifest
To inspect the manifest of a Docker image named my-image:latest, use the following command:
docker manifest inspect my-image:latest
This command retrieves and displays the manifest JSON for the specified image, detailing its layers and configurations.
Example 2: Creating a Docker Image Manifest List
To create a manifest list that points to multiple platform-specific image manifests, you can use:
docker manifest create my-multi-arch-image:latest --amend my-image:amd64 --amend my-image:arm64
This command creates a manifest list for my-multi-arch-image:latest that includes manifests for both AMD64 and ARM64 architectures.
Example 3: Annotating a Docker Image Manifest
Adding annotations to a manifest can be done using:
docker manifest annotate my-image:latest my-registry.io/my-image:latest
This command annotates the manifest of my-image:latest with additional information, such as pointing to a different registry location.
Example 4: Pushing a Docker Image Manifest
To push a manifest to a registry, you can execute:
docker manifest push my-multi-arch-image:latest
This command pushes the manifest list my-multi-arch-image:latest to the configured Docker registry.
Example 5: Merging Docker Image Manifests
Merging manifests can be achieved using:
docker manifest merge my-multi-arch-image:latest --amend my-image:arm64
This command merges the manifest of my-image:arm64 into the existing manifest list my-multi-arch-image:latest.
Example 6: Verifying Docker Image Manifests
To verify the integrity of a manifest, use:
docker manifest inspect --verbose my-image:latest
This command provides a detailed verbose output of the manifest of my-image:latest, including checksums and platform information.
Example 7: Deleting Docker Image Manifests
Deleting manifests from a registry can be done with:
docker manifest rm my-multi-arch-image:latest
This command removes the manifest list my-multi-arch-image:latest from the Docker registry.
Example 8: Extracting Docker Image Manifests
To extract the manifest JSON to a file, you can use:
docker manifest inspect my-image:latest > manifest.json
This command saves the manifest of my-image:latest into a file named manifest.json for further analysis or manipulation.
Example 9: Modifying Docker Image Manifests
Modifying manifest entries can be achieved using:
docker manifest annotate my-image:latest --os linux --arch amd64
This command adds platform-specific details to the manifest of my-image:latest, specifying Linux as the OS and AMD64 as the architecture.
Example 10: Fetching Docker Image Manifests
Fetching manifests from a registry can be done with:
docker manifest fetch my-image:latest
This command fetches and verifies the manifest of my-image:latest from the Docker registry.
To verify if a command like docker manifest inspect my-image:latest executed successfully, you can check for the presence of its output. For example, running the command should display a JSON structure detailing the layers and configuration of my-image:latest. This verification step ensures that the Docker manifest manipulation was completed as intended.
Also check similar articles.
Managing Docker Images
Managing Docker Contexts
Managing Docker Containers
Managing Docker Checkpoints
Managing Docker Builds
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