（1）yum安装docker
[root@namenode ~]# yum install docker-io
（2）启动docker
[root@namenode ~]# /etc/init.d/docker restart
停止 docker： [失败]
Starting docker: [确定]
[root@namenode ~]# /etc/init.d/docker status
docker 已死，但 pid 文件仍存
[root@namenode ~]# docker -d
启动报错，日志查看如下
tail -f /var/log/docker
time="2015-03-09T16:05:29+08:00" level="info" msg="+job serveapi(unix:///var/run/docker.sock)"
time="2015-03-09T16:05:29+08:00" level="info" msg="WARNING: You are running linux kernel version 2.6.32-431.el6.x86_64, which might be unstable running docker. Please upgrade your kernel to 3.8.0."
time="2015-03-09T16:05:29+08:00" level="info" msg="Listening for HTTP on unix (/var/run/docker.sock)"
/usr/bin/docker: relocation error: /usr/bin/docker: symbol dm_task_get_info_with_deferred_remove, version Base not defined in file libdevmapper.so.1.02 with link time reference
（3）google后，解决办法如下
yum install device-mapper-event-libs
（4）重启docker
[root@namenode ~]# /etc/init.d/docker restart
Stopping docker: [FAILED]
Starting docker: [ OK ]
[root@namenode ~]# /etc/init.d/docker status
docker (pid 12503) is running...
