Job for docker.service failed because the control process exited with error code. See

Use Docker in Liunx, Note: Liunx uses the centOS7 version under the virtual machine.
There was no error when I first started installing Docker, but in the follow-upDuring the docker startup process, the following problems occur:

Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service"

When I first encountered this problem, I found the answer on Baidu, but the answers I found could not satisfy the problem, so I slowly explored it.

First look at the kernel version
Because of the command: yum install docker download, the default download is the latest version of Docker, but the kernel version is low may not be compatible with the new version of Docker, so the above error may occur

solution:
Step 1: Uninstall the previously downloaded Docker, use the following command:

yum remove docker-*

Step 2: Update the kernel version of the Liunx system, using the following command:

yum update

After the update is recommended, restart the system.
Step 3: Continue to download and install docker (try to use advanced administrator rights to download) use the following command

yum install dacker

Step 4: Start docker with the following command

systemctl start docker

problem solved!
If you still get an error after installing this, follow this step again.

If you use the docker command, the following error occurs:

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

The first reason may be because docker did not start
The second reason is because docker has an error.
In the final analysis, the docker startup problem, the solution is still the above steps.

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