Upgrading the kernel always gives me trouble on CentOS 7.x so here's some notes on how I did it:

1. Figure out what your current active kernel is:

Current kernel:

uname -a
Linux kernelupgrade 3.10.0-327.10.1.el7.x86_64 #1 SMP Tue Feb 16 17:03:50 …

Quick notes on changing the MAC address of a virt.

First check what is the current MAC address of a virt - in this example freebsd is the virt:

sudo virsh domiflist freebsd

Output:

Interface  Type       Source     Model       MAC
-------------------------------------------------------
vnet0      bridge     bridge0    e1000       52:54:00:da:25:52

A quick …