1 yum源更换为国内的阿里云源
1 备份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2、下载新的CentOS-Base.repo 到/etc/yum.repos.d/
CentOS 5
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
或者
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
CentOS 6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
或者
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
CentOS 7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
或者
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
3、之后运行yum makecache生成缓存
[root@localhost yum.repos.d]# yum clean all
Loaded plugins: fastestmirror
Cleaning repos: base dell-system-update_dependent dell-system-update_independent epel extras updates
Cleaning up everything
Maybe you want: rm -rf /var/cache/yum, to also free up space taken by orphaned data from disabled or removed repos
Cleaning up list of fastest mirrors
[root@localhost yum.repos.d]# yum makecache //把yum源缓存到本地，加快软件的搜索好安装速度
Loaded plugins: fastestmirror
Determining fastest mirrors
epel/x86_64/metalink | 6.7 kB 00:00:00
* base: mirrors.aliyun.com
* epel: mirrors.tongji.edu.cn
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
base | 3.6 kB 00:00:00
dell-system-update_dependent | 2.3 kB 00:00:00
dell-system-update_independent | 2.3 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
(1/24): base/7/x86_64/group_gz | 166 kB 00:00:00
(2/24): base/7/x86_64/filelists_db | 6.9 MB 00:00:03
(3/24): base/7/x86_64/primary_db | 5.9 MB 00:00:03
(4/24): base/7/x86_64/other_db | 2.5 MB 00:00:00
(5/24): dell-system-update_dependent/7/x86_64/primary_db | 33 kB 00:00:00
(6/24): dell-system-update_dependent/7/x86_64/filelists_db | 79 kB 00:00:00
(7/24): dell-system-update_dependent/7/x86_64/other_db | 7.0 kB 00:00:00
(8/24): dell-system-update_independent/filelists_db | 63 kB 00:00:00
(9/24): dell-system-update_independent/primary_db | 112 kB 00:00:01
(10/24): dell-system-update_independent/other_db | 25 kB 00:00:00
(11/24): epel/x86_64/group_gz | 88 kB 00:00:25
(12/24): epel/x86_64/filelists_db | 10 MB 00:00:14
(13/24): epel/x86_64/updateinfo | 929 kB 00:00:00
(14/24): epel/x86_64/prestodelta | 1.2 kB 00:00:05
(15/24): epel/x86_64/primary_db | 6.4 MB 00:00:13
(16/24): extras/7/x86_64/filelists_db | 517 kB 00:00:00
(17/24): extras/7/x86_64/primary_db | 143 kB 00:00:00
(18/24): extras/7/x86_64/prestodelta | 47 kB 00:00:00
(19/24): updates/7/x86_64/prestodelta | 180 kB 00:00:00
(20/24): extras/7/x86_64/other_db | 91 kB 00:00:00
(21/24): updates/7/x86_64/primary_db | 1.2 MB 00:00:00
(22/24): updates/7/x86_64/other_db | 201 kB 00:00:00
(23/24): updates/7/x86_64/filelists_db | 875 kB 00:00:00
(24/24): epel/x86_64/other_db | 3.1 MB 00:00:10
Metadata Cache Created
[root@localhost yum.repos.d]# yum list //查看包列表
参考：
1 https://blog.csdn.net/kangvcar/article/details/73477730