docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon run

docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.See ‘docker run --help’.

使用docker时报docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.See ‘docker run --help’.，可能是你docker服务没有启动

service dockers start   #启动服务