On 2021-12-17 16:46:48 +0100 (+0100), Thomas Goirand wrote: [...]
I'd like to setup the network for VMs inside the VMs. And that's where it becomes tricky. The VM that runs tempest will need to reach the floating IPs of the VMs inside the VMs that are running nova-compute, in order to do ssh tests. How can I do that? Is this even possible? [...]
In the upstream CI system we do that with bridge interfaces on each machine connected to layer 2 tunnels (using VXLAN, though GRE should also work if the cloud you're running in supports it): https://zuul-ci.org/docs/zuul-jobs/general-roles.html#role-multi-node-bridge While the implementation is in Ansible, it's really just a pile of shell commands you should be able to use to reproduce with just about anything. You can find the multi-node-* roles in the roles directory of the zuul-jobs repo: https://opendev.org/zuul/zuul-jobs Hope that helps! -- Jeremy Stanley