CentOS 6更新問題 ：YumRepo Error: All mirror URLs are not using ftp, http[s] or file.

Determining fastest mirrors YumRepo Error: All mirror URLs are not using ftp, http[s] or file. Eg. Invalid release/repo/arch combination/ removing mirrorlist with no valid mirrors: /var/cache/yum/i386/6/base/mirrorlist.txt Error: Cannot find a valid baseurl for repo: base

CentOS 6 在系統更新、安裝新Package的時候
遇到YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
因為CentOS 6 在2020年11月30後官方就不提供維護了，連帶著yum套件庫也無法使用
需要做簡單的更換

參考來源：
https://segmentfault.com/a/1190000039199938
https://arstech.net/centos-6-error-yumrepo-error-all-mirror-urls-are-not-using-ftp-http/