I want to run containers and VMs side by side and not necessarily nested. The main reason for that is GPUs, Voltas mostly, used for CUDA machine learning not for VDI, which is what most of the VM orchestrators like oVirt or vSphere seem to focus on. And CUDA drivers are notorious for refusing to work under KVM unless you pay $esla.

oVirt is more of a side show in my environment, used to run some smaller functional VMs alongside bigger containers, but also in order to consolidate and re-distribute the local compute node storage as a Gluster storage pool: Kibbutz storage and compute, if you want, very much how I understand the HCI philosophy behind oVirt.

The full integration of containers and VMs is still very much on the roadmap I believe, but I was surprised to see that even co-existence seems to be a problem currently.

So I set-up a 3-node HCI on CentOS7 (GPU-less and older) hosts and then added additional (beefier GPGPU) CentOS7 hosts, that have been running CUDA workloads on the latest Docker-CE v19 something.

The installation works fine, I can migrate VMs to these extra hosts etc., but to my dismay Docker containers on these hosts lose access to the local network, that is the entire subnet the host is in. For some strange reason I can still ping Internet hosts, perhaps even everything behind the host's gateway, but local connections are blocked.

It would seem that the ovritmgmt network that the oVirt installation puts in breaks the docker0 bridge that Docker put there first.

I'd consider that a bug, but I'd like to gather some feedback first, if anyone else has run into this problem.

I've repeated this several times in completely distinct environments with the same results:

Simply add a host with a working Docker-CE as an oVirt host to an existing DC/cluster and then try if you can still ping anyone on that net, including the Docker host from a busybox container afterwards (should try that ping just before you actually add it).

No, I didn't try this with podman yet, because that's separate challenge with CUDA: Would love to know if that is part of QA for oVirt already.
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