Here's what I did ...

# awk -F\' '$1=="menuentry " {print $2}' /etc/grub2.cfg
ClearOS (3.10.0-327.3.1.el7.x86_64) 7 (Final) with debugging
ClearOS (3.10.0-327.3.1.el7.x86_64) 7 (Final)
ClearOS, with Linux 3.10.0-229.7.2.v7.x86_64
ClearOS, with Linux 0-rescue-34ad79a08d9047cda7f5cd8bda908cc2

The first item listed is 0, so the line I need is 2 ...

# grub2-set-default 2

A workaround rather than a solution since a "quality testing" update shouldn't break the system.

Output as follows ...

$rpm -qa | grep ^kernel | sort
kernel-3.10.0-229.7.2.v7.x86_64
kernel-3.10.0-327.3.1.el7.x86_64
kernel-tools-3.10.0-327.3.1.el7.x86_64
kernel-tools-libs-3.10.0-327.3.1.el7.x86_64

This is a clean build of Clear 7 Home and haven't changed / added any repos. The app not from the marketplace is Logitech Media Server.

ClearOS 7 fails to boot after update

After building my home server (ClearOS Home subscription) I shut it down to move to its permanent location (I run it headless.) But, the server failed to come up. After hooking it up to a monitor and keyboard I could see what looked like a kernel panic.

Restarting I noted the following boot options:

ClearOS (3.10.0-327.3.1.el7.x86_64) 7 (Final) with debugging
ClearOS (3.10.0-327.3.1.el7.x86_64) 7 (Final)
ClearOS, with Linux 3.10.0-229.7.2.v7.x86_64
ClearOS, with Linux 0-rescue-34ad79a08d9047cda7f5cd8bda908cc2

The top two were added after installation. The third line boots successfully.

Not sure how to resolve this or remove the first two from grub2.