Enabling nested Virtualization on Centos.

23 Jul 2018

I will be bried. To enable nested virtualization you need to parameterize your kvm driver. Sounds hard, but it just as simple as creating /etc/modprobe.d/kvm-nested.conf file with the following contents:

for Intel processors

options kvm-intel nested=1

for AMD processors

options kvm-amd nested=1

Then reboot, or reload the drivers. Rebooting is just easier.

To check that it is enabled check the parameters at the sys filesystem:

cat /sys/module/kvm_intel/parameters/nested

or

cat /sys/module/kvm_amd/parameters/nested

The output should be Y or 1.

Cheer,