How to solve the problem of insufficient memory in docker

Problem:

The redis container started by docker reported an error: There is no available disk space. Through df -h investigation, it was found that the default storage location of docker /var/lib/docker disk space is as high as 99%.

So, how to free up disk space?

Transfer data and modify docker's default storage location

There are many ways to modify docker's default storage location. It is best to change the default storage location of docker to another large directory or disk as soon as possible after docker is installed. Avoid risks caused by migrating data.

1. Stop the docker service

systemctl stop docker

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

mkdir -p /docker/lib

(recommended tutorial ：docker tutorial）

3. Migrate the files under the /var/lib/docker directory to /docker/lib

cp -R/var/lib/docker docker/lib/

4. Modify the docker configuration file

vim /lib/systemd/system/docker.service

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

5. Restart docker

systemctl daemon-reload
systemctl restart docker
systemctl enable docker

6. Confirm whether the Docker Root Dir modification has taken effect

docker info
...
Docker Root Dir: /home/modules/docker/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/

7. Confirm whether the previous image is still there

docker iamges

8. Check disk space

df -h

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