Icinga 2 is an open source monitoring system which checks the availability of your network resources, notifies users of outages and generates performance data for reporting.Scalable and extensible, Icinga2 can monitor large, complex environments across multiple locations.
Icinga Web 2 is a powerful PHP framework for web applications that comes in a clean and reduced design. It’s fast, responsive, accessible and
easily extensible with modules.
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Cacti is a complete network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use interface that makes sense for LAN-sized installations up to complex networks with thousands of devices.
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One of my friend recently upgraded his ubuntu 17.04 to ubuntu 17.10 and after the upgrade my DNS stopped working.
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