1. 更换163源
https://mirrors.163.com/.help/centos.html
2. 更换中科大源
https://mirrors.ustc.edu.cn/help/centos.html
3. 更换清华源
https://mirrors.tuna.tsinghua.edu.cn/help/centos/
4. 更换阿里源
https://developer.aliyun.com/mirror/centos?spm=a2c6h.13651102.0.0.3e221b110mHduj
5. 更换sohu源
http://mirrors.sohu.com/centos/