Network problem of installing docker-engine on Centos-7

After installing docker-engine on Centos-7, it failed to start by

After I use

it shows:

To see more details, I use

There were much more informations now:

The ethernet interface of docker0 can not be assigned IPv4 addresse. It seems many people meet this problem after I searching the google, but none of the solutions works for me. Consequently, I find out this solution in my environment (totally remove the network bridge):

and my docker service startup now!

The key is: docker-engine will not assign IP to docker0 interface which is already exists.

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