docker安装过程遇到的问题
（1）yum安装docker
# yum install docker-io
（2）启动docker
# /etc/init.d/docker restart
停止 docker： [失败]
Starting docker: [确定]
# /etc/init.d/docker status
docker 已死，但 pid 文件仍存
问题2：缺少依赖的包
# 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
# /etc/init.d/docker restart
Stopping docker:
Starting docker:
# /etc/init.d/docker status
docker (pid12503) is running...
问题2：cgroup 未挂载
启动docker,~$ sudo docker -d
INFO using prior storage driver "aufs"
INFO Listening for HTTP on unix (/var/run/docker.sock)
WARN Running modprobe bridge nf_nat failed with message: , error: exit status 1
WARN Your kernel does not support cgroup memory limit: mountpoint for memory not found
WARN mountpoint for cpu not found
FATA Error mounting devices cgroup: mountpoint for devices not found
为cgroup在宿主机上没有挂载。
vim /etc/fstab
none /sys/fs/cgroup cgroup defaults 0 0
重启服务器即可
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