# 在内核启动过程中装载根文件系统时有用
initrd /initramfs-2.6.32-358.el6.x86_64.img
常见错误解决范例：
例1
执行yum就开始报错：
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Error: Cannot retrieve metalink for repository: epel. Please ...
解决办法都是编辑/etc/yum.repos.d/epel.repo，把基础的恢复，镜像的地址注释掉
#baseurl 改成 baseurl
mirrorlist 改成 #mirrorlist
例2
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"DNS/Networking Errors inside the docker"
[root@localhost ~]# docker -dns="8.8.8.8" run centos:6.4 yum install hiphop-php
2013/08/21 07:53:05 POST /v1.4/containers/create
2013/08/21 07:53:05 POST /v1.4/containers/6d9fef14bd1a/start
2013/08/21 07:53:05 POST /v1.4/containers/6d9fef14bd1a/attach?logs=1&stderr=1&stdout=1&stream=1
Loaded plugins: fastestmirror
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was
14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'"
可以执行下面的命令来重置docker的运行环境，从而解决上述问题。
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pkill docker
iptables -t nat -F
ifconfig docker0 down
brctl delbr docker0
docker -d
