yum update
Loaded plugins: fastestmirror
Setting up Install Process
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
You have mail in /var/spool/mail/root
#backup your original repos just in case
cp -a /etc/yum.repos.d/ ~
sed -i s#mirror.centos.org#vault.centos.org#g /etc/yum.repos.d/CentOS-Base.repo
sed -i s/mirrorlist=/#mirrorlist=/g /etc/yum.repos.d/CentOS-Base.repo
sed -i s/#baseurl=/baseurl=/g /etc/yum.repos.d/CentOS-Base.repo
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