Modifying the Docker image storage location and migrating data on CentOS is a common requirement. Here is a detailed step guide to help you complete this task.
1. Stop Docker Service
First, make sure the Docker service has been stopped to avoid data corruption during the migration process.
sudo systemctl stop docker
2. Create a new storage directory
Create a new directory to store Docker images and container data. For example, suppose you want to store data in/home/docker_data/dockerIn the directory:
sudo mkdir -p /home/docker_data/docker
3. Copy existing data
Take existing Docker data from the default location (usually/var/lib/docker) Copy to a new directory. This may take some time, depending on the size of the data volume.
sudo rsync -aqxP /var/lib/docker/ /home/docker_data/docker
4. Modify Docker configuration
Edit Docker's configuration file and specify a new data storage location. Docker configuration files are usually located in/etc/docker/. If the file does not exist, you can create one.
sudo vi /etc/docker/
Add or modify in a filedata-rootConfiguration item, specify the new storage directory:
{ "data-root": "/home/docker_data/docker"}5. Restart Docker service
Save the configuration file and restart the Docker service to make the new configuration take effect.
sudo systemctl start docker
6. Verify the configuration
Make sure that the Docker service has been started successfully and that the new storage location has taken effect. You can check Docker's configuration by:
sudo docker info | grep "Docker Root Dir"
The output should show a new storage location, for example:
Docker RootDir: /home/docker_data/docker
7. Clean old data (optional)
If you are sure that the new storage location has been successfully used and that the old data has been migrated, you can delete the old Docker data directory to free up space.
sudo rm -rf /var/lib/docker
8. Check containers and mirrors
Make sure all containers and images are running properly. You can check with the following command:
sudo docker ps -asudo docker images
Things to note
- Data consistency: During the migration process, make sure the Docker service is completely stopped to avoid data corruption.
- Disk space: Ensure that the new storage directory has enough disk space to accommodate existing Docker data.
- Permissions: Ensure that the permissions of the new storage directory are set correctly, and the Docker service can read and write the directory.
- Backup: Before performing any data migration operations, it is recommended to back up existing Docker data in case of unexpected situations.
Through the above steps, you can successfully modify the Docker image storage location to a new location and complete data migration.
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