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--- server_monitoring:ganglia [2010/06/21 22:41] – created 172.26.14.218
+++ server_monitoring:ganglia [2013/06/18 11:27] (current) – removed aorth
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-====== Ganglia ======
-[[http://ganglia.info/|Ganglia]] is a system for measuring, recording, and graphing certain metrics about hosts in a cluster.  Metrics include things like CPU load, network traffic, disk space, RAM utilization, etc.  These metrics are saved and graphed periodically by [[http://oss.oetiker.ch/rrdtool|RRDtool]]. Rocks automatically configures the head node to query the compute nodes and has a web-based interface where you can monitor the health of the cluster.
-You can see the ganglia installation here:  http://hpc.ilri.cgiar.org/ganglia
-{{:ganglia_diagram_smaller.gif|}}
-Interesting documentation: http://www.ibm.com/developerworks/wikis/display/WikiPtype/ganglia
-===== Troubleshooting =====
-From time to time there are problems with Ganglia's web interface.  You can restart the needed services following this basic procedure:
-  - Stop data collection daemon on HPC: ''service gmetad stop''
-  - Stop monitoring daemon on compute nodes: ''rocks run host compute %%'%%service gmond stop%%'%%''
-  - Start data collection daemon on HPC: ''service gmetad start''
-  - Wait a minute or two
-  - Start monitoring daemon on compute nodes: ''rocks run host compute %%'%%service gmond start%%'%%''
-Now go check the Ganglia web interface and see if the nodes have returned.