运行yum update出现一下错误信息：
# yum update
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=addons error was
14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'"
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'"
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=extras error was
14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'"
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=updates error was
14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'"
http://mirrors.sohu.com/centos/6/addons/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.sohu.com'"
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: addons. Please verify its path and try again
直接修改/etc/resolv.conf不行。必须要在/etc /sysconfig/network-scripts/ifcfg-eth0里
重新设置服务ip地址比如以下我服务器的配置
DEVICE=eth0
TYPE=Ethernet
UUID=dda8decf-b147-4ad9-805f-3d8e5ef82d9d
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=static
IPADDR=172.18.5.250 #########服务IP地址
GATEWAY=172.18.5.254 #########默认网关
NETMASK=255.255.255.0 #########子网掩码
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
HWADDR=00:0C:29:E1:56:CD
PEERDNS=yes
PEERROUTES=yes
这样设置后，/etc/resolv.conf里面根本就不需要设置。service network restart
就可以使用yum了