On Thu, Sep 13, 2007 at 08:48:29AM -0400, Fernanda Foertter wrote: > Hi Everyone, > > I had a quick question. We use Ganglia as part of our Rocks Cluster > setup. But we have port 80 closed to the outside. How can I > securely, somehow, monitor the cluster and allow others to monitor > them without opening the cluster to the world?
I am not familiar with the rocks setup, but most likely all you need in your cluster is to have gmond/gmetric installed in all nodes and running so that all the metrics are collected. in one of the servers (most likely not as part of the cluster as the profile for this machine is most likely different than your cluster nodes as it requires much less CPU but a very fast disk or lots of memory for a ram drive), you had to have gmetad which is collecting all those metrics and writing them into RRD files, which then can be accessed by the web frontend to show them for monitoring purposes. > Whats the best way to setup a secure web-monitoring? Perhaps a > remote web-server that accesses the remote cluster DB? the web server that runs the PHP scripts for showing the cluster monitor data will be most likely the same one that contains the monitoring data (RRD files generated by gmetad), there is no need for the whole cluster to be accessed in port 80, but gmetad has to be able to pull the data from the gmond and for that depending on your setup, you might need to allow access from this web server to your cluster node in port 8649. > Another question: Is there a way that Ganglia can email admins when > servers go offline? Perhaps its trivial and I missed... no, but you could trigger it by a crontab that monitors the XML definition of your cluster from ganglia and looks for HOST entries that are missing compared with the last iteration. and interesting distinctions is that, at least in my opinion, the description of ganglia as a monitoring tool is deceiving, because it is not meant to serve as a health monitor for specific machines like nagios would do, but to monitor the health of the whole cluster and be probably better be labeled as a "capacity trend" tool. Carlo ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Ganglia-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ganglia-general
