https://youtu.be/UySlAfz7e7Q

I created this video to help people learn how easy it is with Libvirt, KVM, and QEMU to have multiple monitors in your virtual machines.

I used to have a Team Fortress 2 server on CentOS 6 with Virtual Box. Now that I’m using KVM/QEMU/Libvirt, I wanted to set up a new one. Also, Valve somewhat changed how they worked a few years ago and I wanted a clean slate. I started with a VM with 40GB. It’s not supposed to take that much, but I remember last time it took much more than the 10GB I’d given the VM and I don’t want to have to increase the disk size again.

So, the current solution for bridging with KVM/QEMU/Libvirt involves macvtap. This allows your VM to be seen by computers on the network which is key if you want to, say, run a server or DNS on a VM. However, there’s a catch - the host can’t reach the VM. Sometimes this doesn’t matter and sometimes it does. For example, if the guest is running DNS and you want the host to be able to use it for DNS, this is an issue. There is another way to do it, but it involves ditching Network Manager. I actually like Network Manager. So what am I to do?