# CentOS 7.8更换yum源
由于默认yum源地址是国外,下载不方便,将其更新为国内的
# 备份原有配置
`cd /etc/yum.repos.d && cp CentOS-Base.repo CentOS-Base.repo_backup`
# 如何存在epel配置,删除
`rm -rf epel*`
# 修改CentOS-Base.repo
> 如果内核版本不是7.8,查看当前内核信息,将7.8.2003替换,查看内核命令`cat /etc/redhat-release`

**开始配置**
$ vi CentOS-Base.repo
```shell
[base]
name=CentOS-$releasever - Base
baseurl=http://mirrors.tuna.tsinghua.edu.cn/centos-vault/7.8.2003/os/x86_64/
gpgcheck=1
gpgkey=http://mirrors.tuna.tsinghua.edu.cn/centos-vault/RPM-GPG-KEY-CentOS-$releasever
[updates]
name=CentOS-$releasever - Updates
baseurl=http://mirrors.tuna.tsinghua.edu.cn/centos-vault/7.8.2003/updates/x86_64/
gpgcheck=1
gpgkey=http://mirrors.tuna.tsinghua.edu.cn/centos-vault/RPM-GPG-KEY-CentOS-$releasever
[extras]
name=CentOS-$releasever - Extras
baseurl=http://mirrors.tuna.tsinghua.edu.cn/centos-vault/7.8.2003/extras/x86_64/
gpgcheck=1
gpgkey=http://mirrors.tuna.tsinghua.edu.cn/centos-vault/RPM-GPG-KEY-CentOS-$releasever
[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://mirrors.tuna.tsinghua.edu.cn/centos-vault/7.8.2003/centosplus/x86_64/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.tuna.tsinghua.edu.cn/centos-vault/RPM-GPG-KEY-CentOS-$releasever
[contrib]
name=CentOS-$releasever - Contrib
baseurl=http://mirrors.tuna.tsinghua.edu.cn/centos-vault/7.8.2003/contrib/x86_64/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.tuna.tsinghua.edu.cn/centos-vault/RPM-GPG-KEY-CentOS-$releasever
```
# 更新配置
清除信息`yum clean all`,建立元数据缓存`yum makecache`
CentOS 7.8更换yum源