今天开始了解Docker，CentOS7，yum方式安装Docker

docker$ sudo yum update

添加源

$ cat >/etc/yum.repos.d/docker.repo <<-EOF

[docker_repo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/7 enabled=1 gpgcheck=1 gpgkey=https://yum.dockerproject.org/gpg EOF

sudo yum install docker-engine

sudo service docker start

docker pull learn/tutorial

docker run learn/tutorial echo " hello world! "

docker version