Officially there is nothing you can do with CentOS 6 - it's dead and buried - there will be no more updates from the CentOS project. From the CentOS-devel mailing list on 9th Nov 2020
This is a friendly reminder.
CentOS 6.10 will EOL at the end of November 2020.
During the first week in December 2020, the 6.10 directory will move to
Packages will still be available at:
However, once moved, there will be no more updates pushed to
vault.centos.org. Therefore, security issues will no longer be fixed,
You should take the rest of the month to either move to a newer versoin
of CentOS Linux ... or to procure Extended el6 support from Red Hat (EUS
your best course of action is to upgrade to a supported OS version.