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Table of Contents
Server Monitoring
Ganglia
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 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
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
- 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.
Monit
Monit is a free open source utility for managing and monitoring, processes, files, directories and filesystems on a UNIX system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations. Monit can start a process if it does not run, restart a process if it does not respond and stop a process if it uses too much resources. it logs to syslog or to its own log file and notifies you about error conditions and recovery status via customizable alert. Monit provides a built-in HTTP(S) interface and you can use a browser to access the Monit server.
M/Monit expand upon Monit's capabilities to provide monitoring and management of all Monit enabled hosts from one easy to use web-interface. Status and events from each monitored system is updated in real-time and displayed in charts, graphs and tables.
Get the latest version at: http://mmonit.com/monit/download
$ wget http://mmonit.com/monit/dist/monit-5.0.3.tar.gz $ tar xfz monit-5.0.3.tar.gz $ cd monit-5.0.3 $ ./configure && make && make install
Accessing monit: http://hpc.ilri.cgiar.org:2812
Nagios
Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes. http://www.nagios.org/about
Installation
Download the latest version of nagios while hot, from http://www.nagios.org/download
$ wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.2.0.tar.gz $ cd nagios-3.2.0 $ ./configure $ make all $ useradd nagios $ make install $ make install-init $ make install-commandmode $ make install-config $ make install-webconf
Configuration
Running the following command will create a new file called htpasswd.users in the /usr/local/nagios/etc directory. It will also create an username/password entry for nagiosadmin. You will be asked to provide a password that will be used when nagiosadmin authenticates to the web server.
htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Download and install plugins
$ wget http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.14.tar.gz $ tar xfz nagios-plugins-1.4.14.tar.gz $ cd nagios-plugins-1.4.14 $ ./configure && make && make install
Edit the configuration files to add host and services to be monitored:
vim /usr/local/nagios/etc/objects/localhost.cfg
Check remote services http://wiki.nagios.org/index.php/Howtos:checkbyssh_RedHat