Temporary failure in name resolution

    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 [root@GZDB ~]# cat /etc/issue CentOS release 5.11 (Final) Kernel \r on an \m [root@GZDB ~]# 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 [root@GZDB yum.repos.d]# ping www.baidu.com ping: unknown host www.baidu.com [root@GZDB 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 [root@GZDB yum.repos.d]# more /etc/resolv.conf  ###未配置dns解析 ###添加dns解析 [root@GZDB yum.repos.d]# echo " > nameserver 121.14.37.62 > nameserver 203.196.0.6">>/etc/resolv.conf [root@GZDB 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 [root@GZDB 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!