Centos7安装docker

• 系统要求

64-bit 系统
kernel 3.10+

• 检查内核版本，返回的值大于3.10便可。

[root@localhost ~]# uname -r
3.10.0-514.el7.x86_64

• 更新yum

[root@localhost ~]# yum update

• 安装docker

[root@localhost ~]# yum install docker-io -y

若是报： No package docker-io available. 则须要更新一下：

sudo yum install epel-release

• 验证安装是否成功(有client和service两部分表示docker安装启动都成功了)

[root@localhost ~]# docker version
Client:
 Version:         1.12.6
 API version:     1.24
 Package version: docker-1.12.6-32.git88a4867.el7.centos.x86_64
 Go version:      go1.7.4
 Git commit:      88a4867/1.12.6
 Built:           Mon Jul  3 16:02:02 2017
 OS/Arch:         linux/amd64

Server:
 Version:         1.12.6
 API version:     1.24
 Package version: docker-1.12.6-32.git88a4867.el7.centos.x86_64
 Go version:      go1.7.4
 Git commit:      88a4867/1.12.6
 Built:           Mon Jul  3 16:02:02 2017
 OS/Arch:         linux/amd64

• 启动docker

[root@localhost ~]# systemctl start docker.service
或者：
[root@localhost ~]#service docker start

•  查看docker镜像

[root@localhost ~]# docker images

• 查看运行的容器

[root@localhost ~]# docker ps

• 设置开机启动

chkconfig docker on