To migrate a Docker container, perform the following steps: Save the container image: Use the docker commit command. Generate container manifest: Use the docker inspect command. Load the image on the target machine: Use the docker load command. Create a new container: Use the docker create command. Start a new container: Use the docker start command.
How to Migrate Docker Containers
Docker is a popular containerization technology that allows you to package your application with all dependencies into a separate unit. This makes it easier to deploy and manage applications in different environments. However, sometimes it is necessary to migrate containers from one machine to another.
step
To migrate a Docker container, you can use the following steps:
-
Save container image:
- Run
docker commit
command to create a new image for the container you want to migrate. - Specifies the name of the new image.
- Run
-
Generate container list:
- Run
docker inspect
command to get a list of containers to be migrated. - Save the manifest to a file.
- Run
-
Load the image on the target machine:
- On the target machine, use the
docker load
command to load the image created in the first step.
- On the target machine, use the
-
Create a new container:
- Using the manifest generated in the second step, create a new container on the target machine using the
docker create
command. - Make sure to specify the same container name and network settings.
- Using the manifest generated in the second step, create a new container on the target machine using the
-
Start a new container:
- Use the
docker start
command to start the newly created container.
- Use the
Things to note
- If the containers use volumes, you need to recreate them manually.
- If the container has mounted ports, you need to reconfigure the port mapping on the target machine.
- If the container is managed by the Docker Orchestration Service, you need to update the orchestration configuration to include the target machine.
Example
Here is an example of migrating a container named "my-app":
<code># 保存鏡像docker commit my-app my-app-new-image # 生成清單docker inspect my-app > my-app-manifest.json # 在目標機器上加載鏡像docker load </code>
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