This white paper provides information on how to monitor Dell™ PowerEdge™ 12G servers in environments managed by Nagios® Core and Nagios XI™ using an agent-free, out-of-band mode via integrated Dell Remote Access Controller (iDRAC7) with Lifecycle Controller. iDRAC7 with Lifecycle Controller is an embedded device in Dell PowerEdge servers that helps IT administrators manage, monitor, update and deploy Dell servers. The technology is designed to make server administrators more productive and improve the overall availability of Dell servers. iDRAC7 sends alerts, helps perform remote server management and reduces the need for physical access to a server. Lifecycle Controller can configure and update a server locally or remotely.Nagios Core is an open source monitoring software tool that offers monitoring and alerting services for servers, switches, applications and services. Nagios Core alerts IT administrators when things go wrong and alerts them again when the problem is resolved. It is the most popular open-source monitoring solution and is used by organizations of all sizes. Nagios XI is a commercial offering by Nagios built on top of Nagios Core and offers additional dashboarding, customization, performance graphing and a host of other features. The Nagios open source user community has made contributions to many plug-ins, including those that monitor Dell PowerEdge servers and their sub-components. This is accomplished via an in-band method using the traditional OpenManage Server Administrator agent installed on top of a server operating system such as Microsoft® Windows®, Red Hat® Enterprise Linux® (RHEL), SUSE Linux Enterprise Server (SLES) etc. Until now, there has not been a way to take advantage of the embedded, agent-free management available with Dell 12th-generation servers using any of the plug-ins present on Nagios Exchange. This white paper shows how customers can take advantage of this Dell innovation by using iDRAC7 in data center environments managed by Nagios Core and Nagios XI consoles.This document presents key features, configuration guidelines, general recommendations and answers to frequently asked questions that will help you to successfully deploy Dell Plug-in for Nagios Core and Dell Add-on for Nagios XI on Dell hardware.