Linux解决Couldn‘t resolve host ‘mirrorlist.centos.org_could not resolve host: mirrorlist.centos.org

这个错误引起主要是因为环境读取不到yum引起的可以考虑/etc/sysconfig/network-scripts/ifcfg-eth0 配置出错导致网络不通。或者/etc/resolv.conf的DNS配置出错。或者可以考虑清楚yum缓存影响（yum clean all）

vi /etc/resolv.conf

nameserver 202.106.0.20（今天又出现此错误，这个nameserver加进去就好了。记得配置静态ip的话DNS也需要加入 然后update yum试试成功就OK了）


今天在linux环境通过yum安装软件报了以下错误：

[root@multi-mysql yum.repos.d]# yum install ncurses devel -y
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
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'"
Error: Cannot find a valid baseurl for repo: base
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从字面意义上看是不能解析mirrorlist.centos.org这个地址，应该是跟dns网络配置有关系，最后解决方法是在DNS域名解析的配置文件增加DNS服务器的IP地址：

[root@multi-mysql ~]# vim /etc/resolv.conf
nameserver 8.8.8.8
nameserver 202.106.0.20

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重启网络服务

[root@multi-mysql ~]# /etc/init.d/network restart
Shutting down interface eth0:                              [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:  Determining if ip address 192.168.1.202 is already in use for device eth0...
                                                           [  OK  ]
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重新yum安装，正常

[root@yunwei ncurses-6.1]# yum install gcc gcc-c++ gcc-g77
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
 * base: ftp.sjtu.edu.cn
 * extras: ftp.sjtu.edu.cn
 * updates: ap.stykers.moe
base                                                     | 3.7 kB     00:00
base/primary_db                                          | 4.7 MB     00:04
extras                                                   | 3.4 kB     00:00
extras/primary_db                                        |  29 kB     00:00
updates                                                  | 3.4 kB     00:00
updates/primary_db                                       | 8.5 MB     00:10
Setting up Install Process
No package gcc-g77 available.
Resolving Dependencies
--> Running transaction check
---> Package gcc.x86_64 0:4.4.7-23.el6 will be installed
--> Processing Dependency: libgomp = 4.4.7-23.el6 for package: gcc-4.4.7-23.el6.x86_64
--> Processing Dependency: cpp = 4.4.7-23.el6 for package: gcc-4.4.7-23.el6.x86_64
--> Processing Dependency: libgcc >= 4.4.7-23.el6 for package: gcc-4.4.7-23.el6.x86_64
--> Processing Dependency: cloog-ppl >= 0.15 for package: gcc-4.4.7-23.el6.x86_64
---> Package gcc-c++.x86_64 0:4.4.7-23.el6 will be installed
--> Processing Dependency: libstdc++-devel = 4.4.7-23.el6 for package: gcc-c++-4.4.7-23.el6.x86_64
--> Processing Dependency: libstdc++ = 4.4.7-23.el6 for package: gcc-c++-4.4.7-23.el6.x86_64
--> Processing Dependency: libmpfr.so.1()(64bit) for package: gcc-c++-4.4.7-23.el6.x86_64
--> Running transaction check
---> Package cloog-ppl.x86_64 0:0.15.7-1.2.el6 will be installed
--> Processing Dependency: libppl_c.so.2()(64bit) for package: cloog-ppl-0.15.7-1.2.el6.x86_64
--> Processing Dependency: libppl.so.7()(64bit) for package: cloog-ppl-0.15.7-1.2.el6.x86_64
---> Package cpp.x86_64 0:4.4.7-23.el6 will be installed
---> Package libgcc.x86_64 0:4.4.7-4.el6 will be updated
---> Package libgcc.x86_64 0:4.4.7-23.el6 will be an update
---> Package libgomp.x86_64 0:4.4.7-4.el6 will be updated
---> Package libgomp.x86_64 0:4.4.7-23.el6 will be an update
---> Package libstdc++.x86_64 0:4.4.7-4.el6 will be updated
---> Package libstdc++.x86_64 0:4.4.7-23.el6 will be an update
---> Package libstdc++-devel.x86_64 0:4.4.7-23.el6 will be installed
---> Package mpfr.x86_64 0:2.4.1-6.el6 will be installed
--> Running transaction check
---> Package ppl.x86_64 0:0.10.2-11.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package                Arch          Version                 Repository   Size
================================================================================
Installing:
 gcc                    x86_64        4.4.7-23.el6            base         10 M
 gcc-c++                x86_64        4.4.7-23.el6            base        4.7 M
Installing for dependencies:
 cloog-ppl              x86_64        0.15.7-1.2.el6          base         93 k
 cpp                    x86_64        4.4.7-23.el6            base        3.7 M
 libstdc++-devel        x86_64        4.4.7-23.el6            base        1.6 M
 mpfr                   x86_64        2.4.1-6.el6             base        157 k
 ppl                    x86_64        0.10.2-11.el6           base        1.3 M
Updating for dependencies:
 libgcc                 x86_64        4.4.7-23.el6            base        104 k
 libgomp                x86_64        4.4.7-23.el6            base        135 k
 libstdc++              x86_64        4.4.7-23.el6            base        296 k

Transaction Summary
================================================================================
Install       7 Package(s)
Upgrade       3 Package(s)

Total download size: 22 M
Is this ok [y/N]: y

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