Question

Docker builds its own bridge network.

After restarting the network,

Then, after restarting docker, an error occurred in executing the command shown in the following figure

Answer 1

Not every mirror contains these instructions, for example centos 7 does not have ifconfig by default.

There are centos7 and centos 6 in it. I wonder which one you are using.

Ping cannot be reached. It is related to dns settings. It can be reached throughipCommand to check your network settings

I downloaded the latest jdeathe/centos-ssh, which does not contain ifconfig and ip instructions.
If you need it, you can go through

Yum install iproute # install ip directive
 Yum install net-tools # install ifconfig command