老师，我看了，安装依赖需要使用sudo指令，可是使用git bash显示sudo指令不存在

$ sudo yum install -y yum-utils \ device-mapper-persistent-data \ lvm2

bash: sudo: command not found

而且安装完docker之后运行docker  run  hello-world，

从远程仓库拉取代码成功，但是之后就没有反应了，是因为没有安装依赖的原因吗

几次没有反应之后强行关闭git-bash，再次运行docker  run  hello-world

C:\Program Files\Docker\Docker\resources\bin\docker.exe: error during connect: Post http://%2F%2F.%2Fpipe%2Fdocker_engine/v1.40/containers/create: open //./pipe/docker_engine: The system cannot find the file specified. In the default daemon configuration on Windows, the docker client must be run elevated to connect. This error may also indicate that the docker daemon is not running.

See 'C:\Program Files\Docker\Docker\resources\bin\docker.exe run --help'.

就出现如上的错误，是否需要更改镜像地址呢