[CentOS] update to 7.4

On Wed, 20 Sep 2017, Gregory P. Ennis wrote:

> This happened to me on one of the units during a 7.4 upgrade, and the only
> way for the system to work for me was to use the previous os.
>
> I tried to use the yum remove kernal 7.4 , but yum tried to remove all of
> the kernels instead of just that last one installed.  I obviously aborted
> the command.

Uninstall a specific kernel, e.g.:

yum remove kernel-3.10.0-693.2.2.el7.x86_64

> Looks like 7.4 has some major problems.

I've seen no major problems so far, having updated a fair few machines.

jh