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    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-MyS

    02

    yum命令——安装、卸载、查询等

    check Check for problems in the rpmdb check-update 检查是否有软件包更新 clean 删除缓存的数据 deplist 列出软件包的依赖关系 distribution-synchronization Synchronize installed packages to the latest available versions downgrade downgrade a package erase 从系统中移除一个或多个软件包 groupinfo 显示组的详细信息 groupinstall 向系统中安装一组软件包 grouplist 列出可安装的组 groupremove 从系统中移除一组软件包 help 显示用法信息 history Display, or use, the transaction history info 显示关于软件包或组的详细信息 install 向系统中安装一个或多个软件包 list 列出一个或一组软件包 load-transaction load a saved transaction from filename makecache 创建元数据缓存 provides 查找提供指定内容的软件包 reinstall 覆盖安装一个包 repolist 显示已配置的仓库 resolvedep 判断哪个包提供了指定的依赖 search 在软件包详细信息中搜索指定字符串 shell 运行交互式的 yum 外壳 update 更新系统中的一个或多个软件包 update-minimal Works like update, but goes to the ‘newest’ package match which fixes a problem that affects your system updateinfo Acts on repository update information upgrade 更新软件包同时考虑软件包取代关系 version yum版本信息

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