Linux系统yum安装报错Cannot find a valid baseurl for repo怎么办

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yum install error
[root@localhost cmake-3.2.2]# yum install gcc
Loaded plugins: fastestmirror, refresh-packagekit, security
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 retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again
[root@localhost cmake-3.2.2]# yum install gcc-c++
Loaded plugins: fastestmirror, refresh-packagekit, security
Determining fastest mirrors
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

解决方法如下（修改 dns 配置）

vi /etc/resolv.conf
在此文件最后加入：nameserver 114.114.114.114

再次安装正常：
[root@localhost cmake-3.2.2]# yum install gcc
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: mirrors.tuna.tsinghua.edu.cn
* extras: mirrors.btte.net
* updates: mirrors.tuna.tsinghua.edu.cn
Setting up Install Process
Resolving Dependencies
— Running transaction check
— Package gcc.x86_64 0:4.4.7-17.el6 will be installed
— Processing Dependency: libgomp = 4.4.7-17.el6 for package: gcc-4.4.7-17.el6.x86_64
— Processing Dependency: cpp = 4.4.7-17.el6 for package: gcc-4.4.7-17.el6.x86_64
— Processing Dependency: libgcc = 4.4.7-17.el6 for package: gcc-4.4.7-17.el6.x86_64
— Processing Dependency: cloog-ppl = 0.15 for package: gcc-4.4.7-17.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 0:4.4.7-17.el6 will be installed
— Processing Dependency: libmpfr.so.1()(64bit) for package: cpp-4.4.7-17.el6.x86_64
— Package libgcc.i686 0:4.4.7-4.el6 will be updated
— Package libgcc.x86_64 0:4.4.7-4.el6 will be updated
— Package libgcc.i686 0:4.4.7-17.el6 will be an update
— Package libgcc.x86_64 0:4.4.7-17.el6 will be an update
— Package libgomp.x86_64 0:4.4.7-4.el6 will be updated
— Package libgomp.x86_64 0:4.4.7-17.el6 will be an update
— Running transaction check
— Package mpfr.x86_64 0:2.4.1-6.el6 will be installed
— 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 4.4.7-17.el6 base 10 M
Installing for dependencies:
cloog-ppl x86_64 0.15.7-1.2.el6 base 93 k
cpp x86_64 4.4.7-17.el6 base 3.7 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 i686 4.4.7-17.el6 base 114 k
libgcc x86_64 4.4.7-17.el6 base 103 k
libgomp x86_64 4.4.7-17.el6 base 134 k

Transaction Summary
==============================================================================================================================================
Install 5 Package(s)
Upgrade 3 Package(s)

Total download size: 16 M
Is this ok [y/N]:

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