Centos8 Yum 源不可用替换
Centos8 不在维护，第三方的镜像站中均已移除CentOS 8的源，yum install 会报错建议更换源。[root@localhost /etc/yum.repos.d]# yum makecacheCentOS-8.0 - AppStream 19 B/s | 38 B 00:02 CentOS-8.0 - Base
