1、将Docker daemon的监听端口写入配置文件
配置文件： /etc/default/docker (CentOS: /etc/sysconfig/docker)
写入：DOCKER_OPTS="-H unix:///var/run/docker.sock -H tcp://0.0.0.0:2375"
The -H unix:///var/run/docker.sock configures a local unix socket for Docker to use. This is the default.
The -H tcp://0.0.0.0:2375 option configures Docker to listen on a TCP port
之后重启Docker
sudo restart docker
2、