docker 1.5 startup error on CentOS 7
在新装的CentOS 7中用官方Docker RPM包安装了docker 1.5，结果启动docker服务失败，错误日志如下：4月 06 00:55:15 localhost.localdomain docker: time="2015-04-06T00:55:15+08:00" level="info" msg="+job serveapi(unix:///var/run/docker.sock)"
4月 06 00:55:15 localhost.localdomain docker: /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
4月 06 00:55:15 localhost.localdomain systemd: docker.service: main process exited, code=exited, status=127/n/a
4月 06 00:55:15 localhost.localdomain systemd: Failed to start Docker Application Container Engine.
4月 06 00:55:15 localhost.localdomain systemd: Unit docker.service entered failed state.
一看便知是docker所依赖的软件包的版本不匹配问题。快速google一下，就知道只要更新device-mapper这个RPM到最新版本即可。相应的命令是：
sudo yum update -y device-mapper
该软件包又更新它所依赖的以下软件包：
device-mapper-event x86_64 7:1.02.93-3.el7 base 158 k
device-mapper-event-libs x86_64 7:1.02.93-3.el7 base 151 k
device-mapper-libs x86_64 7:1.02.93-3.el7 base 259 k
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