Unable to Complete Yum Update CentOS / cPanel (glibc)

Scenario: During an automated update (CentOS running cPanel), the server failed (it was not responding to http, imap, etc.). An SSH session was established and the server rebooted (shutdown -r now). This caused the server to become accessible again (email, website, etc.) However, later it was discovered that automated updates were no longer working, with an emailed error stating:

During a recent attempt to run /scripts/upcp, the system detected that your RPM database is unstable. The system cannot install RPMs, so the upcp script cannot proceed.
TIMEOUT: RPM DB is not responding after 10 minutes.

Accessing SSH again, and running yum update, displayed several errors, in particular:

Error: Package: glibc-devel-2.17-260.el7.x86_64 (@base)
Requires: glibc-headers = 2.17-260.el7
Removing: glibc-headers-2.17-260.el7.x86_64 (@base)
glibc-headers = 2.17-260.el7
Updated By: glibc-headers-2.17-260.el7_6.3.x86_64 (updates)
glibc-headers = 2.17-260.el7_6.3
You could try using –skip-broken to work around the problem

yum reinstall glibc-devel glibc-headers does not resolve the issue.

As the server failed to respond, and evidently appeared to have been rebooted during mid-update, it’s likely transactions did not complete. The command:

yum-complete-transaction

also did not resolve the issue in this scenario.

Solution: In this case list the related RPMs (because we’re looking to see specifically what’s installed, and if  possible, hopefully see what’s contributing to any issue):

rpm -qa | grep glibc

Indeed, we see an issue in the following output (items in red):

root@node8652 [~]# rpm -qa | grep glibc
glibc-devel-2.17-260.el7_6.3.x86_64
glibc-static-2.17-260.el7_6.3.x86_64
glibc-headers-2.17-260.el7.x86_64
glibc-2.17-260.el7_6.3.x86_64
glibc-common-2.17-260.el7_6.3.x86_64
glibc-devel-2.17-260.el7.x86_64

In this case the references to (there should only be one glibc-devel.*):

glibc-devel-2.17-260.el7_6.3.x86_64
glibc-devel-2.17-260.el7.x86_64

Remove: glibc-devel-2.17-260.el7.x86_64 with the following command:

rpm -e glibc-devel-2.17-260.el7.x86_64

Note: Initially the other RPM was selected for removal, but an error was displayed indicating it was in use / required. Instead removing glibc-devel-2.17-260.el7.x86_64 displayed no error in terminal, and removed without issue.

Now run:

yum upate

and after successful update has completed, only then, restart the server.