Nagios is an open source Computer system monitoring, Network monitoring and infrastructure monitoring application. Nagios is a power full monitoring system that enables organization to identify and resolve IT infrastructure problems before they affect critical business processes.
Nagios is licensed under GNU General public licence version 2.
It provides the following features.
- Monitoring of network devices, services, systems, hosts, servers, protocols, applications etc. (SMTP, POP3, HTTP, NNTP, ICMP, SNMP, Processor load, disk usage, system logs).
- Monitoring of temperature and alarms, etc. which have the ability to send collected data via network to specifically written plugins.
- Alerts when critical infrastructure components fail and recover, providing administrator with notice of important events. Alters can be delivered via mail, sms, or custom scrips.
- Remote monitoring supported through SSH or SSL encrypted tunnels.
- Reports provide a historical record of outages, events, notifications and alert response for later review. Availability reports help ensure SLA's are being met.
- Trending and capacity planning addons ensure aware of aging infrastructure.
- Multi-user access to web interface to allows stack holders to view infrastructure status. user-specific views ensures clients see only their infrastructure components.
Cacti is an open source, web based Network Monitoring and Graphing tool. Cacti allows user to poll the services of the data in predetermined intervals and graph the resulting data. It is commonly used to monitor the network traffic such as CPU utilization and network bandwidth utilization by polling a network switch and router interfaces via SNMP protocol.
Cacti is a complete frontend to RRDtool, it stores all of the necessary information to create graph and populate them with data in a MySQL database. The frontend is completely PHP driven. Along with being able to maintain Graphs, Data Sources and Round Robin Archives in database, cacti handles the data gathering. There is also SMNP support for those used to creating traffic graph with MRTG.
In cacti administrator can handle many users, each with their won graph sets and privileges.
Cacti can use one or many back ends "cmd.php" a PHP script suitable for small installations or "Spine" a C-based poller which can scale to thousands of hosts.
Cacti is able to scale to large number of data sources and graphs through the templates. this allows the creation of a single graph or data source template which define any graph or data source associated with it.
Features of Cacti:
- Unlimited Graph items.
- Auto-padding support for graph.
- Graph data manipulation
- Flexible data sources.
- Data gathering on a non-standard time-spam.
- Custom data-gathering scrips.
- Build-in SNMP support.
- Graph templates.
- Data source templates.
- Host templates.
- Tree, list and preview of graph data.
- User based management and security.
- It supports in both Windows and Linux platforms.
Zenoss is a free and open-source application server and network management platform based on the Zope application server. Released under the GNU Public License (GPL) version 2. Zenoss Core provides a web interface that allows system administrators to monitor availability, inventory/configuration, performance and events.
Zenoss Core is build upon Zope, Python, Net-SNMP, RRDtool, MySQL, Twisted and Lucene opensource technologies.
Zenoss Core provides the following capabilities to system administrators.
1. Monitoring availability of network devices using SNMP, SSH, WMI.
2. Monitoring of network services (HTTP, POP3, SNMP, FTP).
3. Monitoring of host resources (processor, disk usage) on most network operating systems.
4. Time-series performance monitoring of devices.
5. Extended Microsoft Windows Monitoring via Windows Management Instrumentation using SAMBA and Zenoss open source extensions.
6. Event management tool to annotate system alerts.
7. Automatically discovers network resources and changes in network configuration.
8. Alerting system provides notifications based on rule sets and on-call calenders.
9. Supports Nagios plug-in format.
Supported platforms for Zenoss:
Most of the Linux platforms, VMware applience and sources for any other Unix systems.
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