Copy images from Container Registry

Container Registry is a service that allows you to store, manage, and distribute Docker container images. It's an essential tool for any developer working with containers. In this article, we'll look at how to copy images from a container registry to a local machine or another registry.

Copying images from a container registry is a common task in the container world. It can be done for various reasons, such as creating backups, testing, or moving images to a different registry. The process is relatively simple, and in this article, we'll go through it step by step.

Table of Contents

• Prerequisites
• Copying images to a local machine
• Copying images to another container registry
• More examples

Prerequisites

Before you begin, you need to have the following:

• Access to a container registry that has the image you want to copy
• Docker installed on your local machine
• Basic knowledge of using the command line

Copying images to a local machine

To copy an image from a container registry to a local machine, you need to use the Docker pull command. Here are the steps:

1. Open a terminal window or command prompt on your local machine.
2. Use the Docker login command to authenticate with the container registry. For example:

docker login registry.example.com

3. Enter your username and password when prompted.
4. Use the Docker pull command to copy the image to your local machine. For example:

docker pull registry.example.com/myimage:latest

5. Wait for the image to download.
6. Use the Docker images command to confirm that the image is now on your local machine. For example:

docker images

Copying images to another container registry

To copy an image from one container registry to another, you need to use the Docker push command. Here are the steps:

1. Open a terminal window or command prompt.
2. Use the Docker login command to authenticate with the source registry. For example:

docker login registry.example.com

3. Enter your username and password when prompted.
4. Use the Docker pull command to download the image from the source registry. For example:

docker pull registry.example.com/myimage:latest

5. Use the Docker tag command to tag the image with the target registry. For example:

docker tag registry.example.com/myimage:latest registry2.example.com/myimage:latest

6. Use the Docker push command to upload the image to the target registry. For example:

docker push registry2.example.com/myimage:latest

7. Wait for the image to upload.
8. Use the Docker images command to confirm that the image is now on the target registry. For example:

docker images

More examples

Here are some more examples of how you can use the Docker pull and push commands:

• Copying an image with a specific tag:

docker pull registry.example.com/myimage:v1.0
docker tag registry.example.com/myimage:v1.0 registry2.example.com/myimage:v1.0
docker push registry2.example.com/myimage:v1.0

• Copying all images from one registry to another:

docker pull registry.example.com/myimage1:latest
docker pull registry.example.com/myimage2:latest
docker tag registry.example.com/myimage1:latest registry2.example.com/myimage1:latest
docker tag registry.example.com/myimage2:latest registry2.example.com/myimage2:latest
docker push registry2.example.com/myimage1:latest
docker push registry2.example.com/myimage2:latest

Related Searches and Questions asked:

Is GCP Container Registry Free?

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Is Google Container Registry a Docker registry?

How to Create a Google Container Registry

That's it for this post. Keep practicing and have fun. Leave your comments if any.