CentOS 6 finally came to end of life (“EOL”) as of November 30, 2020.  A rude awaking if you haven’t been paying attention and attempt a yum update to be presented with an error message.  CentOS does maintain a vault. There is a CentOS-Vault.repo that exists for earlier versions of CentOS 6, but with a few modifications, you can still download and update to the last possible versions of files.  Here is the modified repo to be placed in /etc/yum.repos.d.  To work, however, you’ll need to gzip or remove the existing repos.

Use the following as your CentOS-Base.repo.

# CentOS-Vault.repo
#
# CentOS Vault holds packages from previous releases within the same CentOS Version
# these are packages obsoleted by the current release and should usually not
# be used in production
#-----------------

[C6.10-base]
name=CentOS-6.10 - Base
baseurl=http://vault.centos.org/6.10/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=1

[C6.10-updates]
name=CentOS-6.10 - Updates
baseurl=http://vault.centos.org/6.10/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=1

[C6.10-extras]
name=CentOS-6.10 - Extras
baseurl=http://vault.centos.org/6.10/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=1

[C6.10-contrib]
name=CentOS-6.10 - Contrib
baseurl=http://vault.centos.org/6.10/contrib/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=1

[C6.10-centosplus]
name=CentOS-6.10 - CentOSPlus
baseurl=http://vault.centos.org/6.10/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=1

Rename or move the other CentOS-*.repo files to avoid any issues.

That’s it.