What should I do if it prompts that there is insufficient space when pulling the docker image?

Cause analysis:

This problem is generally caused by insufficient space in the docker root directory.

Solution:

Modify the value of its Docker Root Dir to point to a directory with a larger space.

Specific method:

1. Check the root directory of docker

[root@node2 k8s]# docker info | grep -i "docker root dir"
  WARNING: You're not using the default seccomp profile
Docker Root Dir: /var/lib/docker

2. Check the remaining space of the directory

[root@node2 ~]# df -hl /var/lib/docker
文件系统                容量  已用  可用 已用% 挂载点
/dev/mapper/centos-var  2.0G  1.0G  1.0G   50% /var

We can change it to a larger size space, I changed it to /docker-root here.

3. Create the target directory

mkdir -p /etc/systemd/system/docker.service.d/

4. Create the configuration file

cat /etc/systemd/system/docker.service.d/devicemapper.conf
[Service]
ExecStart=
ExecStart=/usr/bin/dockerd  --graph=/docker-root

5. Restart docker

systemctl daemon-reload
systemctl restart docker
systemctl enable docker

Recommended tutorial: docker tutorial

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