error during connect: In the default daemon configuration on Windows, 
the docker client must be run with elevated privileges to connect.: 
Get http://%2F%2F.%2Fpipe%2Fdocker_engine/v1.24/containers/json: 
open //./pipe/docker_engine: The system cannot find the file specified.

• 解决：

cd "C:\Program Files\Docker\Docker"
DockerCli.exe -SwitchDaemon