centos6.4
桥接
网络因为dns连接不通
配置vi /etc/sysconfig/network-scripts/ifcfg-eth0
配置vi /etc/resolv.conf
重启service network restart
网络ping通后
yum无法下载安装插件
vi /etc/yum.repos.d/CentOS-Base.repo
[base]
name=CentOS-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
baseurl=http://vault.centos.org/5.11/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
#released updates
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
baseurl=http://vault.centos.org/5.11/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
baseurl=http://vault.centos.org/5.11/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
baseurl=http://vault.centos.org/5.11/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/
baseurl=http://vault.centos.org/5.11/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
修改文件后，情况yum源缓存：
yum clean all
此外还可以：
yum clean all
rm -f /var/lib/rpm/__db*
rpm –rebuilddb
yum update
试了试不行，干脆把fastestmirror禁掉解决了：
vi /etc/yum/pluginconf.d/fastestmirror.conf
enabled=1改成0
附上fastestmirror插件介绍：
使用yum可以简化系统软件更新的工作。为了保证更新的持续进行，通常都会提供多个mirror（镜像）地址供下载使用，但由于存在地域问题，从不同的镜 像下载速度差异很大。选择从适合的镜像下载软件包，会极大的影响更新速度。
以CentOS为例，可使用一个叫fastestmirror的插件，让yum 在更新时先根据ping值进行判断，然后从最快响应的地址下载。
yum --disableplugin=fastestmirror update
重新安装插件，正确
