Now that CentOS 5 has gone end of life, there's no update repos left to use:
-bash-3.2# cat /etc/redhat-release
CentOS release 5.11 (Final)
-bash-3.2# yum update
Loaded plugins: downloadonly, fastestmirror
Determining fastest mirrors
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
Eg. Invalid release/
removing mirrorlist with no valid mirrors: /var/cache/yum/base/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: base
All repo contents have been moved to http://vault.centos.org so to fix the problem, the other repos must be removed:
-bash-3.2# ls /etc/yum.repos.d/CentOS-
CentOS-Base.repo CentOS-Media.repo CentOS-Vault.repo
CentOS-Debuginfo.repo CentOS-Sources.repo CentOS-fasttrack.repo
-bash-3.2# ls /etc/yum.repos.d/CentOS-
Leaving only CentOS-Vault.repo:
-bash-3.2# yum update
Loaded plugins: downloadonly, fastestmirror
Determining fastest mirrors
Setting up Update Process
No Packages marked for Update
-bash-3.2#
