CentOs8更改國內yum源(Centos-vault)

1. 備份

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.back

2. 下載新的 CentOS-Base.repo 

centos8

wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo 

或者

curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2

3.清理緩存

　yum clean all

4.生成緩存

yum makecache

5.yum update出現Couldn't connect to server for mirrors.aliyuncs.com問題

更改DNS

echo -e "# Generated by NetworkManager\nnameserver 114.114.114.114\nnameserver 119.29.29.29" > /etc/resolv.conf

重啟網卡

nmcli connection up eth0
nmcli device reapply eth0
nmcli device connect eth0

清理緩存

生成緩存