Setting up Ganglia at University of Canterbury

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To monitor the gateway virtual machines (and in particular, the GRAM5 gateway ng1.canterbury.ac.nz), I have setup Ganglia - with a monitoring daemon running at each of the virtual machines, and a meta-server and the web application running at ngportal.canterbury.ac.nz.

Ganglia would work out of the box with multicast (and listing all VMs under the "unspecified" cluster).

The changes I have done are thus only to:

  • configure the "cluster" information in each of the VMs
  • switch the communication from IP multicast to TCP pull from the central server (I didn't want to broadcast to the whole server network).

[edit] Setting up a Ganglia client

  • Enable EPEL first (x86_64 or i386)

rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/x86_64/epel-release-5-3.noarch.rpm

  • Install Ganglia monitoring daemon 
yum install ganglia-gmond
  • Edit cluster information in /etc/gmond.conf 
cluster {
  name = "UoC grid gateway"
  owner = "BlueFern, University of Canterbury"
  latlong = "S43.52 E172.58"
  url = "http://www.bluefern.canterbury.ac.nz/"
}
  • Edit the udp_send_channel and udp_recv_channel to communicate via the local hostname (but not localhost) instead of multicast 
udp_send_channel {
  #mcast_join = 239.2.11.71
  port = 8649
  #ttl = 1
  <b>host = ng1</b>
}

udp_recv_channel { 
  #mcast_join = 239.2.11.71
  port = 8649  
  #bind = 239.2.11.71
  <b>bind = ng1</b>
}
  • Enable and start the service 
chkconfig gmond on
service gmond start

[edit] Setup the Ganglia meta server and web app

  • Install the application (pulls in ganglia-gmetad and php as dependencies) 
yum install ganglia-web
  • Edit /etc/gmetad.conf, comment out the default data_source and list each of the hosts to be monitored as a separate data_source: 
data_source "ng1" 30 ng1
data_source "ng2" 30 ng2
data_source "ng2hpc" 30 ng2hpc
data_source "ng2sge" 30 ng2sge
data_source "nggums" 30 nggums
  • Enable and start gmetad 
chkconfig gmetad on
service gmetad start
  • Restart Apache (to pick up Ganglia conf and load PHP - a reload is not enough) 
service httpd restart
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