The monitoring system is one of the advanced features of the RighScale Dashboard, which allows you to view real-time graphical data for all running instances. The monitoring system is based on two open source projects: collectd (http://collectd.org) and RRDtool (http://rrdtool.org).
Note: The monitoring features are only available for our pay editions. If you have a Developer account, you need to upgrade in order to unlock this feature. Please contact us at firstname.lastname@example.org.
The overall process of RightScale's monitoring system is as follows:
Customers whose application scales into the tens, hundreds or even thousands of instances via a scalable server array may wonder if they can still view monitoring data in the RightScale Dashboard. Furthermore, can they view aggregate data from all of the servers? The answer is yes. However, we did have to implement a policy in order to maintain performance while user view their data. Remember that each server instance registers with the load balancers (e.g. HAProxy) as the site scales so that the workload can be evenly balanced between application servers in the array. As an example, you could have 1000 instances registered with two front-end servers running load balancing software. If each registered server instance (1000 in our example) had its own individual set of graphs as well as contributed to an aggregate graph, the amount of data would be overwhelming and take too long to retrieve and graph. Hence, the concept of active and inactive Servers with respect to Monitoring had to be defined. Servers are considered inactive if they have not sent data for a period of one day (or more). The most important points with respect to viewing monitoring data of sites with many servers are:
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