CentOS遇到Error: Cannot find a valid baseurl for repo: base错误解决办法

Centos运行yum update时候提示Error: Cannot find a valid baseurl for repo: base,具体如下

yum update
Loaded plugins: fastestmirror
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/x86_64/6/base/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: base
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