Tweaking Your Linux Template

Choose a Virtualization-Specific Kernel

Adopt  linux-image-kvm kernel, which is specifically crafted for KVM virtualization.

On Ubuntu, for example, you would run:

apt install linux-image-kvm
apt purge linux-image-generic

Tidy Up Before Publishing Your Template

# removes logs
journalctl --vacuum-size=1
# removes user history
history -c

(as root) rm /root/.bash_history