centos7配置yum源、epel源为国内镜像
缺省yum源的服务器通常在国外，安装时速度比较慢。为了提高安装rpm包的速度，可以将yum源配置为国内的阿里repo。
1、先备份系统原有的repo
[root@localhost ~]#cd /etc/yum.repos.d/
[root@localhost yum.repos.d]#ls
CentOS-Base.repo CentOS-Debuginfo.repo CentOS-Media.repo CentOS-Vault.repo webtatic-archive.repo webtatic-testing.repo CentOS-CR.repo CentOS-fasttrack.repo CentOS-Sources.repo epel.repo
[root@localhost yum.repos.d]#mkdir backup
[root@localhost yum.repos.d]# mv * ./backup/
2、获取阿里centos7的base-repo
[root@localhost yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
[root@localhost yum.repos.d]# ls backup CentOS-Base.repo
3、清除并重新生成yum cache
[root@localhost yum.repos.d]# yum clean all
[root@localhost yum.repos.d]# yum makecache
4、测试一下新的yum源是否可用
[root@localhost yum.repos.d]# yum install -y screenLoaded plugins: fastestmirror, langpacksLoading mirror speeds from cached hostfile * base: mirrors.aliyun.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.comResolving Dependencies--> Running transaction check---> Package screen.x86_64 0:4.1.0-0.25.20120314git3c2946.el7 will be installed--> Finished Dependency ResolutionDependencies Resolved================================================================================================================================================== Package Arch Version Repository Size==================================================================================================================================================Installing: screen x86_64 4.1.0-0.25.20120314git3c2946.el7 base 552 kTransaction Summary==================================================================================================================================================Install 1 PackageTotal download size: 552 kInstalled size: 914 kDownloading packages:screen-4.1.0-0.25.20120314git3c2946.el7.x86_64.rpm | 552 kB 00:00:00 Running transaction checkRunning transaction testTransaction test succeededRunning transaction Installing : screen-4.1.0-0.25.20120314git3c2946.el7.x86_64 1/1 Verifying : screen-4.1.0-0.25.20120314git3c2946.el7.x86_64 1/1 Installed: screen.x86_64 0:4.1.0-0.25.20120314git3c2946.el7 Complete!
5、获取阿里centos7的epel-repo
[root@localhost yum.repos.d]# wget https://mirrors.aliyun.com/repo/epel-7.repo
6、清除并创建cache
[root@localhost yum.repos.d]# lsbackup CentOS-Base.repo epel-7.repo[root@localhost yum.repos.d]# yum clean all
[root@localhost yum.repos.d]# yum makecache
至此，大功告成！！！