Centos7 installed Docker, after the installation is successful, start failed tips:

We can see that it is prompted to be failed to start docker application container engine.
So I find a variety of similar errors online, saying that it is necessary to close FireWallD.Service and SELinux. Hey, this is the ability to cause the docker to start, but this block is not because this reason is caused.
Later I found that Docker's ENGINE is based on a storage driver provided by Device Mapper, and it relies on DEVICEMAPPER. So I will delete and restart the service to solve the problem that Docker cannot start normally.
Perform the following command
vim /etc/docker/daemon.json
{ “graph”: “/mnt/docker-data”, “storage-driver”: “overlay” }

Service starts successfully!
Reprinted from https://www.cnblogs.com/dalianmao890710/p/9241752.html
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