This is a stand-alone application that communicates with Icinga Core. Conveniently, there are several Web interfaces that can be used and we chose Icinga Web 2. If you need to make changes on a regular basis, Icinga may become a bit time-consuming to configure and manage from the command prompt. For those needing solid Windows support, Icinga can utilize the NSClient++ to run local scripts which provide detailed system information. One common method is an SNMP daemon that runs on the remote system. In cases where remote access may not be available, Icinga offers agent-based monitoring. Plugins are available for monitoring hosts and services like Linux, Windows, databases, SMTP, Web services, hardware, mail servers and third-party applications like VMware and SAP. With the abundance of available plugins, you may never need to build your own, but Icinga provides instructions on how to accomplish this, if desired. Icinga utilizes different monitoring methods the most common is the use of a pre-built or custom service-monitoring plugin. Icinga provides templates that cover most scenarios, making it easier to customize its use in your environment. While this approach might be a bit overwhelming for first-time users, we found that the concepts are fairly easy to grasp once you spend some time with the various files. In addition to the 10-plus default files, you can create your own custom files and include these as part of the overall Icinga configuration. Icinga uses a series of configuration files to store information about how the infrastructure is monitored. Icinga provides flexibility in how often to check, with various warning levels defining how and who to alert when something needs attention. For each server you can define what services to check, from a simple ping command to make sure the server is on and responding, or checking to see if the HTTP or FTP services are running. For instance, you can create what Icinga calls a ‘host object’, which is essentially a rule or task, to monitor a server. Icinga provides impressive granularity as to how hosts and services are monitored.
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