Solution when systemctl start docker fails to start in Centos7
After installing docker, start docker with the command, but the startup fails
Bug recurrence:
Use systemctl status docker.service to view the log:
The cause of the problem: Here is that SELinux in the Linux kernel does not support overlay2 graph driver. There are two solutions, either start a new kernel; or just disable selinux in docker, -selinux-enabled=false.
Here we use the second method to solve：
vi /etc/sysconfig/docker
Then start docker: systemctl start docker, the problem is solved
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