Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. It is based on a hierarchical design targeted at federations of clusters. It leverages widely used technologies such as XML for data representation, XDR for compact, portable data transport, and RRDtool for data storage and visualization. 
 
 It has been used to link clusters across university campuses and around the world and can scale to handle clusters with 2000 nodes. It relies on a multicast-based listen/announce protocol to monitor state within clusters. The ganglia system comprises two unique daemons, a PHP-based web front-end. 
 
 Demo:
 <UL>
	<LI><A HREF="http://monitor.millennium.berkeley.edu/" target="_blank">http://monitor.millennium.berkeley.edu/</A>. Monitoring of University of California Berkeley Grid.</LI>
	<LI><A HREF="http://ganglia.wikimedia.org/" target="_blank">http://ganglia.wikimedia.org/</A> Monitoring of Wikimedia grid</LI>
 </UL>
 Sourceforge location: <A HREF="http://sourceforge.net/projects/ganglia/" target="_blank">http://sourceforge.net/projects/ganglia/</A>

Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. It is based on a hierarchical design targeted at federations of clusters. It leverages widely used technologies such as XML for data representation, XDR for compact, portable data transport, and RRDtool for data storage and visualization.

Ganglia - scalable distributed monitoring system

Nagios monitors your entire IT infrastructure to ensure systems, applications, services, and business processes are functioning properly. It provides centralized view of entire monitored IT infrastructure. In the event of a failure, Nagios can alert technical staff of the problem, allowing them to begin remediation processes before outages affect business processes, end-users or customers. 

 Nagios could be extended via Plugins. It is possible to monitor any probes (temperature, alarms...), which is capable of sending data to specific plugin. It has web and mobile interface for viewing current network status, notifications, problem history, log files, etc. 
 
 <A HREF="http://nagiosplugins.org/" target="_blank">http://nagiosplugins.org/</A> lists all available plugins.

Nagios monitors your entire IT infrastructure to ensure systems, applications, services, and business processes are functioning properly. It provides centralized view of entire monitored IT infrastructure. In the event of a failure, Nagios can alert technical staff of the problem, allowing them to begin remediation processes before outages affect business processes, end-users or customers.

Nagios - monitors your entire IT infrastructure

Cacti is a web based front end tool to generate graphs for RRD files. Cacti allows a user to poll services at predetermined intervals and graph the resulting data. It is generally used to graph time-series data of metrics such as CPU load and network bandwidth utilization. It has built-in SNMP support to receive management data from various devices. 

 Cacti is majorly a graphic tool. It collects data from various data sources, stores the data and generates graph out it.

Cacti is a web based front end tool to generate graphs for RRD files. Cacti allows a user to poll services at predetermined intervals and graph the resulting data. It is generally used to graph time-series data of metrics such as CPU load and network bandwidth utilization. It has built-in SNMP support to receive management data from various devices.

Cacti - Generates graph from RRD files

Zabbix is an enterprise-class open source distributed monitoring solution. It is highly scaleable, capable of monitoring more than 100,000 devices and servers. A Zabbix agent can also be installed on UNIX and Windows hosts to monitor statistics such as CPU load, network utilization, disk space, etc. It also supports agentless monitoring via SNMP, TCP and ICMP. It monitors performance in real time and alers users via mail, SMS, Jabber (XMPP) clients. It supports variety of database including Oracle, MySQL, PostgreSQL, SQLite. Web based interface to visualize the data and generate reports and stats.

Zabbix is an enterprise-class open source distributed monitoring solution. It is highly scaleable, capable of monitoring more than 100,000 devices and servers. A Zabbix agent can also be installed on UNIX and Windows hosts to monitor statistics such as CPU load, network utilization, disk space, etc. It also supports agentless monitoring via SNMP, TCP and ICMP.

Zabbix - distributed monitoring solution

Angry IP Scanner (or simply ipscan) is an open-source and cross-platform network scanner designed to be fast and simple to use. It scans IP addresses and ports and it is  widely used by network administrators. 

Angry IP Scanner - Fast and Friendly Network Scanner

Collectl benchmarks and monitors system health and determine what your system was doing at some time in the past. You can choose to monitor any of a broad set of subsystems which currently include buddyinfo, cpu, disk, inodes, infiniband, lustre, memory, network, nfs, processes, quadrics, slabs, sockets and tcp. 

Collectl could report interrupts at the CPU level. It writes information to the rolling log file and it is also capable to export the data to different formats like s-expression, plot format etc which could be imported in different application to draw graph.

Collectl benchmarks and monitors system health and determine what your system was doing at some time in the past. You can choose to monitor any of a broad set of subsystems which currently include buddyinfo, cpu, disk, inodes, infiniband, lustre, memory, network, nfs, processes, quadrics, slabs, sockets and tcp.

Collectl - Monitors system health

collectd is a daemon which collects system performance statistics periodically and provides mechanisms to store the values in a RRD files. It comes with more than 90 <A HREF="http://collectd.org/wiki/index.php/Table_of_Plugins" target="_blank">Plug-ins</A>, which helps to process, store and present the data in the way we want. 

 collectd utilizes a data push model. The data is collected and sent (pushed) to a multicast group or server. Thus there is no central instance which queries any values. collectd is able to handle any number of hosts, from one to several hundred.

collectd is a daemon which collects system performance statistics periodically and provides mechanisms to store the values in a RRD files. It comes with more than 90 Plug-ins, which helps to process, store and present the data in the way we want.

collectd – The system statistics collection daemon

Pandora FMS is a performance and availability monitoring system, ready for big environments. It uses agents for local monitoring and can do several kinds of remote network monitoring. It watches your systems and applications, and allows you to know the status of any element of those systems. It supports WMI, Agent and Network monitoring. It provides support to track GIS and viewing. Pandora FMS can also monitor any kind of TCP/IP service, without the need to install agents, and monitor network systems such as load balancers, routers, switches, operating systems, applications, or simply printers if you need. Pandora FMS also supports SNMP for collecting data and for receiving trap.

 <img src="/AppImages/Article/pandora-img1.png" alt="" class="float-center">

Pandora FMS is a performance and availability monitoring system, ready for big environments. It uses agents for local monitoring and can do several kinds of remote network monitoring. It watches your systems and applications, and allows you to know the status of any element of those systems.

Pandora FMS - Flexible Monitoring System

Icinga is an enterprise grade open source monitoring system which keeps watch over networks and any conceivable network resource, notifies the user of errors and recoveries and generates performance data for reporting. Icinga is a fork of Nagios and is backward compatible. So, Nagios configurations, plugins and addons can all be used with Icinga. Icinga sends notifications via email, SMS, Twitter, instant messaging. It has more features than Nagios. It is distributed and scalable. Sourceforge location: <A HREF="http://sourceforge.net/projects/icinga/" target="_blank">http://sourceforge.net/projects/icinga/</A>

Icinga is an enterprise grade open source monitoring system which keeps watch over networks and any conceivable network resource, notifies the user of errors and recoveries and generates performance data for reporting. Icinga is a fork of Nagios and is backward compatible. So, Nagios configurations, plugins and addons can all be used with Icinga. Icinga sends notifications  via email, SMS, Twitter, instant messaging. It has more features than Nagios. It is distributed and scalable.

Icinga - Monitoring system, A Nagios fork

Epoptes is an open source computer lab management and monitoring tool. It allows for screen broadcasting and monitoring, remote command execution, message sending, imposing restrictions like screen locking or sound muting the clients and much more.

Epoptes - Computer Lab Management and Monitoring Tool

Zenoss Core is an open source IT monitoring product that delivers the functionality to effectively manage the configuration, health, performance of networks, servers and applications through a single, integrated software package. 

 It could collect data via SNMP, SSH, WMI, JMX and Syslog. Virtual and Cloud Infrastructure Monitoring and Management is possible. It manages events from various sources like syslog, SNMP trap, Windows Event log. It has secured web portal to visualize the data in the graphical charts. Reports could be scheduled and send it to Admin via EMail. 

 Sourceforge Location: <A HREF="http://sourceforge.net/projects/zenoss/" target="_blank">http://sourceforge.net/projects/zenoss/</A>

Zenoss Core is an open source IT monitoring product that delivers the functionality to effectively manage the configuration, health, performance of networks, servers and applications through a single, integrated software package.

Zenoss - Open Source IT Management

Yamon is a very simple Perl program designed to check whether a server is up-and-running and send an alert to a human when something appears to be broken. It can check for Web server, Email server, DSL line etc.

Yamon - Yet Another Monitoring script 

Munin is a networked resource monitoring tool that can help analyze and monitor the performance of your computers, networks, SANs and applications. It is capable to identify "what's different today" and when the performance problem crops up? Munin has a master/node architecture in which the master connects to all the nodes at regular intervals and asks them for data. It then stores the data in RRD files, and (if needed) updates the graphs. Munin emphasis on Plug and Play. Check out its <A HREF="http://exchange.munin-monitoring.org/" target="_blank">plugin repository</A>. Demo: <A HREF="http://munin.ping.uio.no/" target="_blank">http://munin.ping.uio.no/</A>

Munin is a networked resource monitoring tool that can help analyze and monitor the performance of your computers, networks, SANs and applications. It is capable to identify "what's different today" and when the performance problem crops up?

Munin - resource monitoring tool

Shinken is a monitoring tool compatible with Nagios configuration standard and plugins. It is capable to monitor network services like SMTP, POP3, HTTP, NNTP, ICMP, SNMP, FTP, SSH. It monitors host resources (processor load, disk usage, system logs) on a majority of operating systems. It could monitor any probes (temperature, alarms), if it has capability to send data.

shinken - monitoring tool compatible with Nagios

Centreon is one of the most flexible and performant monitoring software. It is based upon the most effective Open Source monitoring engine Nagios. Centreon gathers functionalities that are essential to the monitoring of critical infrastructures. It provides real time system monitoring, Load distribution and High availability. It is modular and it could be extended with Plugins like Centreon map, Centreon BI, Google map and much more. It alerts the admin via Email, SMS.

Centreon is one of the most flexible and performant monitoring software. It is based upon the most effective Open Source monitoring engine Nagios. Centreon gathers functionalities that are essential to the monitoring of critical infrastructures.

Centreon - Global IT monitoring

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