CentOS7系统配置国内yum源和epel源
源文章地址：https://www.cnblogs.com/renpingsheng/p/7845096.html
1.首先进入/etc/yum.repos.d/目录下，新建一个repo_bak目录，用于保存系统中原来的repo文件
[root@bogon ~]# cd /etc/yum.repos.d/
[root@bogon yum.repos.d]# mkdir repo_bak
[root@bogon yum.repos.d]# mv *.repo repo_bak/
2.在CentOS中配置使用网易和阿里的开源镜像
到网易和阿里开源镜像站点下载系统对应版本的repo文件
[root@bogon yum.repos.d]# wget http://mirrors.aliyun.com/repo/Centos-7.repo
[root@bogon yum.repos.d]# wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
[root@bogon yum.repos.d]# ls
Centos-7.repo CentOS-Base-163.repo repo.bak
或者手动下载repo文件并上传到/etc/yum.repos.d/目录
3.清除系统yum缓存并生成新的yum缓存
[root@bogon yum.repos.d]# ls # 列出/etc/yum.repos.d/目录下的文件
Centos-7.repo CentOS-Base-163.repo repo.bak
[root@bogon yum.repos.d]# yum clean all # 清除系统所有的yum缓存
Loaded plugins: fastestmirror, langpacks
Repository base is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Cleaning repos: base extras updates
Cleaning up everything
Cleaning up list of fastest mirrors
[root@bogon yum.repos.d]# yum makecache # 生成yum缓存
Loaded plugins: fastestmirror, langpacks
Repository base is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
base | 3.6 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
(1/12): base/7/x86_64/filelists_db | 6.7 MB 00:00:02
(2/12): base/7/x86_64/group_gz | 156 kB 00:00:02
(3/12): base/7/x86_64/other_db | 2.5 MB 00:00:01
(4/12): base/7/x86_64/primary_db | 5.7 MB 00:00:02
(5/12): extras/7/x86_64/prestodelta | 51 kB 00:00:01
(6/12): extras/7/x86_64/filelists_db | 494 kB 00:00:02
(7/12): extras/7/x86_64/other_db | 86 kB 00:00:00
(8/12): extras/7/x86_64/primary_db | 130 kB 00:00:01
(9/12): updates/7/