How to use Docker for persistent storage and data backup of containers

How to use Docker for persistent storage and data backup of containers

Docker is an open source containerization platform that can help developers better build and deploy and management applications. In Docker, a container is an independent unit of an application and its dependencies. However, due to the nature of containers, the data in the container is temporary and will disappear when the container is stopped. In some scenarios, we need to store the container's data persistently and retain important data in the container. This article will introduce how to use Docker for persistent storage and data backup of containers, and provide specific code examples.

1. Use Docker Volume for container data persistence

Docker Volume is a mechanism provided by Docker for sharing and persistent storage of data between the host and the container. By using Docker Volume, we can store the data in the container to a specified directory on the host to achieve persistent storage of data.

1. Create a Docker Volume

We can create a Docker Volume using the following command:

$ docker volume create myvolume

This will create a Docker volume named "myvolume "Docker Volume.

2. Mount the Docker Volume into the container

Next, we need to mount the created Docker Volume into the container. You can add the -v parameter when using the docker run command to mount.

$ docker run -v myvolume:/path/to/mount myimage

This will mount the Docker Volume named "myvolume" to the "/path/to/mount" directory in the container.

3. Storing data into Docker Volume

Next, we can store data into Docker Volume. In the container, just store the data in the mounted directory:

$ echo "Hello, Docker Volume!" > /path/to/mount/data.txt

This will create a file named "data.txt" in the Docker Volume and set its content to "Hello, Docker Volume!".

4. Persistent storage

When the container is stopped or deleted, the data in the Docker Volume will still be saved in the specified directory on the host, thus realizing the container data Persistent storage.

2. Use Docker Compose to back up container data

Docker Compose is a tool for defining and running multi-container Docker applications. It uses a YAML file to configure the application's services and can connect different containers together. We can use Docker Compose to easily manage the running of the container, and we can also use it to regularly back up the data in the container.

1. Create a Docker Compose file

First, create a Docker Compose file named "docker-compose.yml":

version: '3'
services:
  backup:
    image: alpine
    volumes:
      - myvolume:/backup
    command: cp -r /path/to/mount /backup

volumes:
  myvolume:

above In the example, we used the Alpine image and mounted the Docker Volume named "myvolume" to the "/backup" directory in the container. We then use the cp command to copy the data from the "/path/to/mount" directory in the container to the "/backup" directory.

2. Run Docker Compose

Next, run Docker Compose using the following command:

$ docker-compose up -d

This will create and start a file named "backup" A container that will periodically back up data to a specified directory.

So far, we have introduced how to use Docker for persistent storage and data backup of containers. By using Docker Volume for persistent storage of container data, we can save the data in the container in a specified directory on the host. Using Docker Compose to regularly back up the data in the container can ensure the security and reliability of the data. I hope the above content is helpful to you, please leave a message for discussion.

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