centos7.0安装docker

检查前提条件

1.docker要求linux内核必须大于3.8版本且为64位，检查内核版本：

[root@localhost ~]# uname -r
3.10.0-123.el7.x86_64

2.检查 Device Mapper

[root@localhost ~]# ll /sys/class/misc/device-mapper/   
total 0
-r--r--r--. 1 root root 4096 Sep  9 08:16 dev
drwxr-xr-x. 2 root root    0 Sep  9 07:54 power
lrwxrwxrwx. 1 root root    0 Sep  9 08:16 subsystem -> ../../../../class/misc
-rw-r--r--. 1 root root 4096 Sep  9 07:53 uevent

安装docker

设置yum:

cat > /etc/yum.repos.d/docker.repo <<-EOF
[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/experimental/centos/7/
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
EOF

确认系统中是否存在旧的docker相关的组件并删除

# rpm -qa |grep docker

安装docker-engine

# yum -y install docker-engine

启动docker

# systemctl start docker

查看docker版本

# docker info
Server Version: 1.12.1

设置自启动

# systemctl enable docker