I am developing a distributed application, which I'm currently running on a cluster of Ubuntu VMs over LAN. I'd like to evaluate the performance of my application over WAN. So I decided to use Netem and tc to add network delay, etc. . My problem is that I don't know which values to set for latency, jitter, packet loss, etc. which represents a generalized WAN for creating meaningful evaluation results that supports my claim that the application has been evaluated over WAN? I've not found so far a resource indicating that, forwarding me to such a resource would be also very welcomed. Thank you very much.
We have OpenStack v2.3.1, Mitaka with KVM installed on our cluster. While creating instances, the VMs are created successfully every time. However, Cloud-init randomly stops before creating SSH keys only on a few of the instances (this is not dependent on the node running the VM). Therefore, we cannot SSH to the created VM. This strangely does not leave any errors behind in the logs. Any idea what could cause this? Logs of working and non-working instances include below (The differences are at the end of the logs): Thank you.