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Nagios Core 4 Home PageNagios Core 4 Host InformationNagios Core 4 Host Status DetailsNagios Core 4 IntroductionNagios Core 4 Service InformationNagios Core 4 Service Overview For All Host GroupsNagios Core 4 Service Overview For All Service GroupsNagios Core 4 Service Status DetailsNagios Core 4 Status MapsNagios Core 4 Tactical OverviewNagios Core Active ChecksNagios Core Adaptive MonitoringNagios Core Alerting With MySQL and Nagios NWC13Nagios Core Authentication And Authorization In The CGIsNagios Core CGI Configuration File OptionsNagios Core Cached ChecksNagios Core Configuration OverviewNagios Core Configuring SSL/TLSNagios Core Custom CGI Headers and FootersNagios Core Detection and Handling of State FlappingNagios Core Distributed MonitoringNagios Core Enhanced CGI Security and AuthenticationNagios Core Event HandlersNagios Core External CommandsNagios Core Fast Startup OptionsNagios Core Graphing Performance Info With MRTGNagios Core Host ChecksNagios Core Host and Service DependenciesNagios Core How To Monitor A Linux/Unix MachineNagios Core How To Monitor A Netware ServerNagios Core How To Monitor A Network PrinterNagios Core How To Monitor A Publicly Available Service (HTTP, FTP, SSH, etc.)Nagios Core How To Monitor A Router/SwitchNagios Core How To Monitor A Windows MachineNagios Core How to Maintain Over 20 Monitoring Appliances NWC14Nagios Core Integration OverviewNagios Core Leveraging SNMP Extensions with Nagios NWC13Nagios Core Main Configuration File OptionsNagios Core Monitoring Remote Locations with Nagios NWC13Nagios Core Monitoring Service and Host ClustersNagios Core Nagios, AWS, and Hosted VoIP NWC13Nagios Core Nagios Plugin APINagios Core Nagios URL In NotificationsNagios Core Nagios on AWS NWC14Nagios Core Notification EscalationsNagios Core NotificationsNagios Core Object Configuration OverviewNagios Core Object DefinitionsNagios Core Object InheritanceNagios Core On Call RotationsNagios Core Passive ChecksNagios Core Passive Host State TranslationNagios Core Performance DataNagios Core Performance Graphs Using InfluxDB + Nagflux + Grafana + HistouNagios Core Performance Graphs Using PNP4NagiosNagios Core Plugin Development GuidelinesNagios Core Predictive Dependency ChecksNagios Core SNMP Explained NWC15Nagios Core SNMP Monitoring Architecture With Nagios NWC13Nagios Core SNMP Trap IntegrationNagios Core Scheduled DowntimeNagios Core Security ConsiderationsNagios Core Service And Daemon ChecksNagios Core Service and Host Freshness ChecksNagios Core Standard Macros in NagiosNagios Core Starting and Stopping NagiosNagios Core State StalkingNagios Core State TypesNagios Core Status Map Customization (Legacy)Nagios Core Status Map CustomizationNagios Core TCP Wrapper IntegrationNagios Core Time Period InheritanceNagios Core Time PeriodsNagios Core Understanding Macros and How They WorkNagios Core Upgrading From Previous VersionsNagios Core Upgrading Nagios Core From SourceNagios Core Using Grafana With PNP4NagiosNagios Core Using The Nagiostats UtilityNagios Core Verifying Your ConfigurationNagios Core Volatile ServicesNagios Core Writing a Custom Worker

Nagios Core - Active Checks

Nagios is capable of monitoring hosts and services in two ways: actively and passively. Active checks are the most common method for monitoring hosts and services and is explain in this document.

Documentation - Active Checks

Final Thoughts

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