Hi,
I have been playing with Magnum (Antelope), creating a lot of clusters with the same template and varying the number of masters and/or nodes, having ~10 clusters started in the same project. I observed recently that cluster configuration that used to work well were not working any more (CREATE_FAILED during the master deployment in general). I have not found any evidence of the cause digging in various logs but I observed that with the current list of active clusters, if add a new one (even with a configuration as minimal as 1 master and 1 node), not only its creation fails but also the other (or at least) running clusters become unhealthy. If I delete the failed cluster, the other clusters return to the healthy state. It seems very reproducible (I did it more than 10 times) but I still don't see any message in the logs that could help to identify the cause.
I've the feeling (but may be wrong) that it is related to either an insufficient project quota or an insufficient limit on one of the OpenStack service. Any idea on a possible cause or any advice on where to look for some information?
Thanks in advance.
Michel