Solve the problem that the disk space of docker container is full

preface

Docker server, after running for a period of time, found that the server disk directory is almost insufficient. Du -h –max-depth=1 / indicates that the /var/lib/docker directory is too large. To solve the problem, perform the following steps:

Transfer data changes the default docker storage location

There are several ways to change the default docker storage location. It is best to modify the default storage location of Docker to other large directories or disks in the first time after docker is installed. Avoid risks caused during data migration.

• Stop the Docker service

  systemctl stop docker
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• To create a new docker directory, run df -h to find a large disk
  
  I created /home/modules/ docker-lib under /home

   mkdir -p /home/modules/docker/lib
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• Migrate files under /var/lib/docker to /home/modules/docker-lib
  
  The migrated to complete the docker path: / home/modules/docker/lib/docker

  rsync -avz /var/lib/docker/ /home/modules/docker/lib/
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• Configure the/etc/systemd/system/docker. Service. D/devicemapper. Conf
  
  Check the/etc/systemd/system/docker. Service. D directory and the devicemapper. Conf exists. If it does not exist, create one

  mkdir -p /etc/systemd/system/docker.service.d/
  vi /etc/systemd/system/docker.service.d/devicemapper.conf
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  Add the following to devicemapper.conf:

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

  systemctl daemon-reload
  systemctl restart docker
  systemctl enable docker
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• Check whether the Docker Root Dir modification has taken effect

  [root@iZbp1jcwx7sfb1yrnvpg84Z docker]# docker info. Docker Root Dir: /home/modules/docker/lib/docker Debug Mode (client):false
  Debug Mode (server): false
  Registry: https://index.docker.io/v1/
  ...
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• After the startup is successful, check whether the previous image is still available

  [root@iZbp1jcwx7sfb1yrnvpg84Z docker]# docker imagesREPOSITORY 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
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• Delete the files in the /var/lib/docker-/ directory

Reference link: blog.csdn.net/weixin_3282…