Installing and configuring Ganglia

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Prerequisites:

· A server , say MASTER , with RHEL version installed, I used RHEL 4

· Install the below packages (rpms)

1. ganglia-web-3.0.6-1.el4

2. ganglia-3.0.6-1.el4

3. ganglia-gmond-3.0.3-1

4. ganglia-gmetad-3.0.6-1.el4

Scenario:

We will setup a basic architechture, Though I had finally worked on a multi tier architecture of it. Incase any issue please feel free to post, maybe I can be of any help.

Configurations on Master:

Once you install the above packages, you need to run the below commands to start the services. Once started you can check by opening http://master/ganglia

$/etc/init.d/gmetad start

$/etc/init.d/httpd start

$ vi /etc/gmond.conf

You can mention the name of the cluster being monitored as below:

/* If a cluster attribute is specified, then all gmond hosts are wrapped inside

* of a tag. If you do not specify a cluster tag, then all will

* NOT be wrapped inside of a tag. */

cluster {

name = "Test Cluster"

owner = "My Team"

}

$ /etc/init.d/gmond start

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Configuration on cluster hosts:

For cluster hosts to send data to the master, you need to install gmond clients on all of the hosts.

Once you install the clients , you have to edit the /etc/gmond.conf file for pointing these hosts to update MASTER with the status. Please see below:

$ rpm –ivh ganglia-gmond-3.0.3-1.rpm

$ vi /etc/gmond.conf

/* If a cluster attribute is specified, then all gmond hosts are wrapped inside

* of a tag. If you do not specify a cluster tag, then all wi

ll

* NOT be wrapped inside of a tag. */

cluster {

name = "Test Cluster"

owner = "My Team"

latlong = "unspecified"

url = "unspecified"

}

The other change is for specifying the udp_SEND_channels

/* Feel free to specify as many udp_send_channels as you like. Gmond

used to only support having a single channel */

udp_send_channel {

# mcast_join = 239.2.11.71

host = (Master IP)

port = 8649

}

Now once you are done with all the configurations , you just need to wait for a while, it takes some time for the master to fetch the data and then create RRDs (graphs) for the hosts.

Then open http://master/ganglia and there you go, you are now monitoring your hosts with ganglia.

Happy Monitoring, enjoy

Cheerz.

Ash