默认docker.sock是root:docker的权限
直接执行docker build会报错如下:
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.30/build?buildargs=%7B%7D&cachefrom=%5B%5D[......]