在线安装docker
rpm -ivh http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
mount /dev/sr0 /mnt
yum -y install docker-io
升级docker
1、下载docker最近稳定版
curl -sSL -O https://get.docker.com/builds/Linux/x86_64/docker-1.9.1
2、停止docker服务并备份文件
service docker stop
mv /usr/bin/docker /usr/bin/docker_bak
3、升级docker
mv docker-1.9.1 /usr/bin/docker
chmod +x /usr/bin/docker
service docker start