Ganglia
Ganglia is a scalable distributed system
monitoring tool that allows remote viewing live or historical statistics for a cluster.
The Ganglia system consists of the following components.
·
A PHP based web front end
·
Ganglia monitoring daemon (gmond): a multi-threading monitoring
daemon.
·
Ganglia Meta daemon (gmetad): a multi-threading aggregation
daemon.
·
A few Small utility programs.
The daemon
gmetad aggregates metrics from the gmond instances, storing them in a
database.The front end pulls the metrics from the database and graphs them. You
can aggregate data from multiple clusters by setting up a separate gmetad for
each,and then a master gmetad to aggregate data from the others. If you
configure Ganglia to monitor multiple cluster, remember to use a separate port
for each cluster.
MapR with
Ganglia
The CLDB
reports metrics about its own load, as well as cluster-wide metrics such as CPU
and memory utilization, the number of active File
Deceived
Reference
Links:
http://www.msg.ucsf.edu/local/ganglia/ganglia_docs/install.html
http://sourceforge.net/apps/trac/ganglia/wiki/Gmond%203.1.x%20General%20Configuration
http://sourceforge.net/apps/trac/ganglia/wiki/Gmond%203.1.x%20General%20Configuration
if we are
not able to see /etc/www/ then
install httpd using
yum install
httpd
install
gmond in all the nodes including edge nodes.
Made some
changes in /etc/httpd/conf.d/ganglia.conf
<Location
/ganglia>
Order deny,allow
Deny from all
Allow from 127.0.0.1
Allow from ::1
# Allow from .example.com
</Location>
sudo
/usr/bin/passwd ganglia
set the
password as ganglia
What is unicast and Multicast?
/etc/init.d/httpd status
To Know the process which are running on the cluster
netstat -plten
To know gmetad status
/etc/init.d/gmetad status
curl http://<IP Address/hostname>/ganglia
Process to Start gmond service:
# service gmond start/restart
or
# /etc/gmond start/restart
the above command will do the following things.
this will install the gmond binary. this binary is located /usr/sbin/gmond
You can create the default gmond configuration file with gmond binary.
This will also install the gmond daemon which will continuously collect metrics from the machine.
Installation error Message:
gmond dead but subsys locked
Solution: Increase the log level while changing dubug_level to 100 at global section
-----------------------------------
globals {
daemonize = yes
setuid = yes
user = ganglia
debug_level = 100
max_udp_msg_len = 1472
mute = no
deaf = no
host_dmax = 0 /*secs */
cleanup_threshold = 300 /*secs */
-------------------------------
gexec = no
}
