After playing around, with both Zabbix and Ganglia, I decided to go ahead with Ganglia. The installation is tricky but once it is installed, configuring and adding hosts is easy. Here I will discuss, installation and configuration of Ganglia. Both the client and server daemon will be installed on the same machine.
Ganglia is a monitoring system for high-performance computing systems. Ganglia comprises of two daemons. The daemon gmond, acts like a client and sends machine information( as xml fomat), to daemon gmetad which stores these statistics in a round robin database.
A PHP-based web frontend is used to dispay the graphs in near real time.
Before starting Ganglia a few dependencies are required to be installed.
# tcsh
# setenv INSTALL_DIR /opt/rrdtool-1.4.4
# setenv BUILD_DIR /opt/build/rrdbuild
# cd $BUILD_DIR
# wget http://oss.oetiker.ch/rrdtool/pub/rrdtool-1.4.4.tar.gz
# gunzip -c rrdtool-1.4.4.tar.gz | tar xf – # cd rrdtool-1.4.4
# ./configure --prefix=$INSTALL_DIR && make && make install
This would have installed round robin database. It is required only on the head node. The head node (server) would be the one where you want to install gmetad daemon.
Another dependency required for Ganglia is libconfuse.
# cd /opt/build
# wget http://bzero.se/confuse/confuse-2.6.tar.gz
# /bin/tar -xzf confuse-2.6.tar.gz
# cd confuse-2.6
# ./configure --prefix=/opt/ganglia
# env CFLAGS="-O3 -fPIC" ./configure --prefix=/opt/ganglia
# make
# make install
Now we download Ganglia source package and begin installation.
# cd /opt/build/
# wget http://sourceforge.net/projects/ganglia/files/ganglia%20monitoring%20core/3.1.7/ganglia-3.1.7.tar.gz/download
# tar -xzf ganglia-3.1.7.tar.gz
# cd ganglia-3.1.7
# setenv CFLAGS "-I/opt/ganglia/include/ -I/opt/rrdtool-1.4.4/include"
# setenv LDFLAGS "-L/opt/ganglia/lib/ -L/opt/rrdtool-1.4.4/lib"
# ./configure --prefix=/opt/ganglia --with-gmetad --sysconfdir=/etc/ganglia
# make
# make install
Make sure the permissions are appropriate on path /opt/ganglia/rrds. This is the path where I have my round robin database.
# cd /opt/ganglia/sbin/
# ./gmond --default-config > gmond.conf
# ./gmetad --default-config > gmetad.conf
Setup config files for gmetad and gmond.conf
# vi gmond.conf
Set up your udp_send_channel to look like this:
udp_send_channel {
host = masterhostname
port = 8650
ttl = 1
}
# vi gmetad.conf
Modify directives as:
data_source "MyCluster" localhost
rrd_rootdir "/opt/ganglia/rrds"
# cp gmond.conf /etc/ganglia/.
# cp gmetad.conf /etc/ganglia/.
# cd $BUILD_DIR
# cp gmond/gmond.init /etc/rc.d/init.d/gmond
# vi /etc/rc.d/init.d/gmond
Set this variable as
GMOND=/opt/ganglia/sbin/gmond
Optional (this would enable running the daemons as an automated service) :
# chkconfig --add gmond
# chkconfig --list gmond
gmond 0:off 1:off 2:on 3:on 4:on 5:on 6:off
# /etc/rc.d/init.d/gmond start
Starting GANGLIA gmond: [ OK ]
# cd /opt/build/ganglia-3.1.7/gmetad
# cp gmetad.init /etc/rc.d/init.d/gmetad
# vi /etc/rc.d/init.d/gmetad
GMETAD=/opt/ganglia/sbin/gmetad
# chkconfig --add gmetad
# chkconfig --list gmetad
gmetad 0:off 1:off 2:on 3:on 4:on 5:on 6:off
# /etc/rc.d/init.d/gmetad start
Starting GANGLIA gmetad: [ OK ]
Edit httpd.conf
Add the following lines if they are not a part of your config file.
LoadModule php5_module modules/libphp5.so
Edit DirectoryIndex like
DirectoryIndex index.html index.html.var index.php
Addtype application/x-httpd-php .php
AddType application/x-httpd-php-source .phps
Copy “web” folder to httpd document root location
Edit conf.php in web folder:
define("RRDTOOL", "/opt/rrdtool-1.4.4/bin/rrdtool");
RRDTOOL should point to rrdtool path
# /sbin/service httpd restart
You can point your browser to the web front end location and it should display you the graphs.
