最近在使用yum方式安装perl-DBD-MySQL时碰到了Temporary failure in name resolution，Trying other mirror。即命名解析失败，尝试使用其它镜像。由于本机为最近安装的新服务器，下面是这个问题的现象描述及处理过程。
1、故障现象
###当前环境
[[email protected] ~]# cat /etc/issue
CentOS release 5.11 (Final)
Kernel \r on an \m
[[email protected] ~]# yum install perl-DBD-MySQL
..............
http://mirrors.pubyun.com/centos/5.11/os/x86_64/CentOS/mysql-5.0.95-5.el5_9.x86_64.rpm:
[Errno 4] IOError: <urlopen error (-3, ‘Temporary failure in name resolution‘)> Trying other mirror.
http://mirrors.sina.cn/centos/5.11/os/x86_64/CentOS/mysql-5.0.95-5.el5_9.x86_64.rpm:
[Errno 4] IOError: <urlopen error (-3, ‘Temporary failure in name resolution‘)> Trying other mirror.
Error Downloading Packages:
mysql-5.0.95-5.el5_9.x86_64: failure:
CentOS/mysql-5.0.95-5.el5_9.x86_64.rpm from base: [Errno 256] No more mirrors to try.
perl-DBI-1.52-2.el5.x86_64: failure:
CentOS/perl-DBI-1.52-2.el5.x86_64.rpm from base: [Errno 256] No more mirrors to try.
perl-DBD-MySQL-3.0007-2.el5.x86_64: failure:
CentOS/perl-DBD-MySQL-3.0007-2.el5.x86_64.rpm from base: [Errno 256] No more mirrors to try.
###尝试ping百度，结果提示未知的主机
[[email protected] yum.repos.d]# ping www.baidu.com
ping: unknown host www.baidu.com
[[email protected] yum.repos.d]# ping www.baidu.com
ping: unknown host www.baidu.com
2、故障解决
###结合上面的错误提示及无法ping通百度，应该是dns解析未配置
[[email protected] yum.repos.d]# more /etc/resolv.conf ###未配置dns解析
###添加dns解析
[[email protected] yum.repos.d]# echo "
> nameserver 121.14.37.62
> nameserver 203.196.0.6">>/etc/resolv.conf
[[email protected] yum.repos.d]# ping www.baidu.com
PING www.a.shifen.com (119.75.217.109) 56(84) bytes of data.
64 bytes from 119.75.217.109: icmp_seq=1 ttl=52 time=38.7 ms
64 bytes from 119.75.217.109: icmp_seq=2 ttl=52 time=38.8 ms
64 bytes from 119.75.217.109: icmp_seq=3 ttl=52 time=38.7 ms
--- www.a.shifen.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 6078ms
rtt min/avg/max/mdev = 38.711/38.742/38.801/0.165 ms
###再次yum perl-DBD-MySQL时成功
[[email protected] yum.repos.d]# yum install perl-DBD-MySQL
.......
Is this ok [y/N]: y
Downloading Packages:
(1/3): perl-DBD-MySQL-3.0007-2.el5.x86_64.rpm | 148 kB 00:00
(2/3): perl-DBI-1.52-2.el5.x86_64.rpm | 600 kB 00:00
(3/3): mysql-5.0.95-5.el5_9.x86_64.rpm | 4.9 MB 00:00
-------------------------------------------------------------------------------------
Total 349 kB/s | 5.6 MB 00:16
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : perl-DBI 1/3
Installing : mysql 2/3
warning: /etc/my.cnf created as /etc/my.cnf.rpmnew
Installing : perl-DBD-MySQL 3/3
Installed:
perl-DBD-MySQL.x86_64 0:3.0007-2.el5
Dependency Installed:
mysql.x86_64 0:5.0.95-5.el5_9 perl-DBI.x86_64 0:1.52-2.el5
Complete!