centos系统如何更换yum源

centos系统更换源：

1.备份原始yum源

cd /etc/yum.repos.d

cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo

2.下载yum文件，替代原始yum源

CentOS 6

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/CentoOS-6.repo

CentOS 7

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/CentOS-7.repo

CentOS 8

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/CentOS-8.repo

3.yum clean all 清除缓存

4.yum makecache 生成缓存

其它yum源下载地址：

腾讯源http://mirrors.cloud.tencent.com/repo/centos7_base.repo

网易源http://mirrors.163.com/.help/CentOS7-Base-163.repo

华为源https://repo.huaweicloud.com/repository/conf/CentOS-7-reg.repo

注意：安装时可能出现的错误

-bash: wget: command not found

解决办法：

# 执行如下命令

yum install -y wget