Nagios Overview Set up Nagios Core for infrastructure and service monitoring with host definitions, check commands, notification contacts, and custom plugins. Covers configuration, common check setups, and plugin development. Instructions Task A: Install and Configure Nagios Task B: Define Hosts and Services Task C: Configure Commands and NRPE Task D: Notification Contacts Task E: Custom Plugin Best Practices - Always run to verify config before reloading to prevent outages - Use NRPE for remote checks that need local access (disk, CPU, memory) - Set 1 to avoid alerting on transient failures…