Fine-Tuning Linux Templates

Opt for a Virtualization-Specific Kernel

The linux-image-kvm kernel is tailored for KVM virtualization, so it's the one you'll want to use.

For instance, on Ubuntu, you would run:

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

Pre-Publication Cleanup

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

(as root) rm /root/.bash_history