安裝linux，需要系統內核為3.x以上，如果centos版本為7以下，先升級系統內核
1.關閉selinux
setenforce 0 sed -i '/^SELINUX=/c\SELINUX=disabled' /etc/selinux/config
2.下載安裝epel
wget http://mirrors.sohu.com/fedora-epel/6/x86_64/epel-release-6-8.noarch.rpm rpm -ivh epel-release-6-8.noarch.rpm sed -i 's/^mirrorlist=https/mirrorlist=http/' /etc/yum.repos.d/epel.repo
3.安裝docker-io
yum -y install docker-io
4.啟動docker
service docker start
5.查看docker版本
docker version