How to migrate docker

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:

1. 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.

2. Generate container list:

   • Run docker inspect command to get a list of containers to be migrated.
   • Save the manifest to a file.

3. 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.

4. 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.

5. Start a new container:

   • Use the docker start command to start the newly created container.

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># 保存镜像docker commit my-app my-app-new-image # 生成清单docker inspect my-app > my-app-manifest.json # 在目标机器上加载镜像docker load </code>

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