Solve the problem of insufficient docker disk space

After the server where Docker is located has been running for a while, it was found that the server disk directory was running out of space. By checking the directories level by level through du -h --max-depth=1 /, it is found that the files in the /var/lib/docker directory are too large. Use the following method to solve this problem.

Transfer data to modify docker default storage location

There are several ways to modify the default storage location of Docker.
It is best to change the default storage location of Docker to another large directory or disk as soon as possible after installing Docker. Avoid risks caused during data migration.

- Stop the docker service

systemctl stop docker

- Create a new docker directory, execute the command df -h, and find a large disk

I created the /data/docker/lib directory under the /data directory

 mkdir -p /data/docker/lib

- Migrate the files under /var/lib/docker directory to /data/docker/lib

Completed docker path after migration: /data/docker/lib/docker

rsync -avz /var/lib/docker/ /data/docker/lib/

- Configure /usr/lib/systemd/system/docker.service

vi /usr/lib/systemd/system/docker.service

[Service]
ExecStart=/usr/bin/dockerd --graph=/data/docker/lib/docker

- Restart Docker

systemctl daemon-reload
systemctl restart docker
systemctl enable docker

- Confirm whether the Docker Root Dir modification has taken effect

[root@iZbp1jcwx7sfb1yrnvpg84Z docker]# docker info
...
Docker Root Dir: /data/docker/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
...

- After the startup is successful, confirm whether the previous image is still there

[root@iZbp1jcwx7sfb1yrnvpg84Z docker]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
10.80.177.233/policy 2.1.2 64ac4e178cd2 2 hours ago 818 MB
10.80.177.233/crm 2.1.3 d7636fbb7a29 2 hours ago 762 MB

- After confirming that the container is OK, delete the files in the /var/lib/docker/ directory

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