
Background of the article:
In the development environment, because the docker test server runs too many containers and images, the disk space is often filled up. So now I decided to change the docker storage directory to the new mount point.
(Learning video sharing: Programming video)
1. Check Docker disk usage
docker system df
2. Clean the disk
docke system prune
Delete useless data volumes of closed containers and network untagged images -a parameter Useless images will also be deleted (use with caution)
3. Stop the Docker service
systemctl stop docker
4 , Migrate data directory
rsync -avz /var/lib/docker /data/docker/lib/
/var/lib/docker: docker default data directory/var/lib/docker: target directory, you need to create it before execution
5. Configure mapper File
Modify according to the installation configuration file of the docker service
vi /usr/lib/systemd/system/dokcer.service
Add attributes in ExectStart=xxx
ExectStart=xxx --graph /data/docker/lib/docker
Re-update the docker service
systemctl disable docker systemctl enable docker systemctl daemon-reload systemctl start docker
6 . Check
docker info
and you will see the following information indicating success.
Docker Root Dir: /data/docker/lib/docker
Execute docker images and you will see that all previous images have been synchronized.
Related recommendations: docker tutorial
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