文章系转载，便于整理和分类，原文地址：https://blog.csdn.net/qq_45714272/article/details/1184176741.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@caq ~]# cd /etc/yum.repos.d/
[root@caq yum.repos.d]# mkdir repo_bak
[root@caq 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@caq yum.repos.d]# wget http://mirrors.aliyun.com/repo/Centos-7.repo
[root@caq yum.repos.d]# wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
[root@caq yum.repos.d]# ls
Centos-7.repo CentOS-Base-163.repo repo.bak3.清除系统yum缓存并生成新的yum缓存
[root@caq 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@caq 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@caq 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/x86_64/prestodelta | 406 kB 00:00:01
(10/12): updates/7/x86_64/filelists_db | 2.1 MB 00:00:01
(11/12): updates/7/x86_64/other_db | 354 kB 00:00:00
(12/12): updates/7/x86_64/primary_db | 3.6 MB 00:00:01
Determining fastest mirrors
Metadata Cache Created4.安装epel源
[root@caq yum.repos.d]# yum list | grep epel-release
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
epel-release.noarch 7-9 extras
[root@caq yum.repos.d]# yum install -y epel-release
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
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package epel-release.noarch 0:7-9 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=============================================================================================================
Package Arch Version Repository Size
=============================================================================================================
Installing:
epel-release noarch 7-9 extras 14 k
Transaction Summary
=============================================================================================================
Install 1 Package
Total download size: 14 k
Installed size: 24 k
Downloading packages:
epel-release-7-9.noarch.rpm | 14 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : epel-release-7-9.noarch 1/1
Verifying : epel-release-7-9.noarch 1/1
Installed:
epel-release.noarch 0:7-9
Complete!
[root@caq yum.repos.d]# ls # epel源安装成功，比原来多了一个epel.repo和epel-testing.repo文件
Centos-7.repo CentOS-Base-163.repo epel.repo epel-testing.repo repo.bak5.使用阿里开源镜像提供的epel源
[root@caq yum.repos.d]# wget -O /etc/yum.repos.d/epel-7.repo http://mirrors.aliyun.com/repo/epel-7.repo # 下载阿里开源镜像的epel源文件
--2018-03-08 20:22:14-- http://mirrors.aliyun.com/repo/epel-7.repo
Resolving mirrors.aliyun.com (mirrors.aliyun.com)... 183.2.199.237, 113.96.109.95, 113.96.109.93, ...
Connecting to mirrors.aliyun.com (mirrors.aliyun.com)|183.2.199.237|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1084 (1.1K) [application/octet-stream]
Saving to: ‘/etc/yum.repos.d/epel-7.repo’
100%[=================================================================================================>] 1,084 --.-K/s in 0s
2018-03-08 20:22:14 (130 MB/s) - ‘/etc/yum.repos.d/epel-7.repo’ saved [1084/1084]
[root@caq yum.repos.d]# ls
CentOS7-Base-163.repo Centos-7.repo epel-7.repo epel.repo epel-testing.repo repo_bak6.再次清除系统yum缓存，并重新生成新的yum缓存
[root@caq yum.repos.d]# yum clean all
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
Repository epel is listed more than once in the configuration
Repository epel-debuginfo is listed more than once in the configuration
Repository epel-source is listed more than once in the configuration
Cleaning repos: base epel extras updates
Cleaning up everything
Cleaning up list of fastest mirrors
[root@caq yum.repos.d]# yum makecache
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
Repository epel is listed more than once in the configuration
Repository epel-debuginfo is listed more than once in the configuration
Repository epel-source is listed more than once in the configuration
base | 3.6 kB 00:00:00
epel | 4.7 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
(1/18): base/7/x86_64/group_gz | 156 kB 00:00:01
(2/18): base/7/x86_64/filelists_db | 6.7 MB 00:00:07
(3/18): base/7/x86_64/primary_db | 5.7 MB 00:00:06
(4/18): epel/x86_64/group_gz | 266 kB 00:00:01
(5/18): epel/x86_64/updateinfo | 899 kB 00:00:02
(6/18): epel/x86_64/prestodelta | 7.1 kB 00:00:00
(7/18): base/7/x86_64/other_db | 2.5 MB 00:00:05
(8/18): epel/x86_64/primary_db | 6.3 MB 00:00:04
(9/18): extras/7/x86_64/filelists_db | 636 kB 00:00:00
(10/18): extras/7/x86_64/primary_db | 166 kB 00:00:00
(11/18): extras/7/x86_64/other_db | 108 kB 00:00:00
(12/18): extras/7/x86_64/prestodelta | 102 kB 00:00:01
(13/18): epel/x86_64/other_db | 3.0 MB 00:00:01
(14/18): epel/x86_64/filelists_db | 10 MB 00:00:09
(15/18): updates/7/x86_64/filelists_db | 3.5 MB 00:00:02
(16/18): updates/7/x86_64/prestodelta | 771 kB 00:00:02
(17/18): updates/7/x86_64/other_db | 621 kB 00:00:00
(18/18): updates/7/x86_64/primary_db | 6.0 MB 00:00:03
Determining fastest mirrors
* epel: mirrors.aliyun.com
Metadata Cache Created