This is the fifth entry in a blog post series explaining how to make the most out of your OpenNebula 4.4 cloud. In previous posts we explained the new multiple datastore system with storage load balancing, the enhanced cloud bursting to Amazon features, the multiple groups functionality and the enhanced Amazon API implementation.
OpenNebula is aimed at extremely large production clouds and it’s continuously evolving to become more and more scalable. We are excited to announce that the upcoming OpenNebula 4.4 release features a brand new monitoring system that delivers more performance and scalability.
The old monitoring system divided the hosts into chunks, and for each monitoring cycle it executed a set of static probes on that chunk of hosts via ssh, collecting the monitoring information (including Virtual Machines running in the hosts). The following monitoring cycle would do the same thing with the next chunk of hosts. As a consequence, when the number of hosts was very large the system took a large amount of time to monitor all the hosts. It was possible to increase the number of monitored hosts per cycle, but beyond a certain amount the system got overloaded with ssh connections.