Editing Training 2022 Linux team/ (section)

==Training session on Nagios Training Service team part2 03 March 2024 - Tetra Support Staff - Biswajit Banerjee==

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'''Video summary:''' [PARTIAL TRANSCRIPT QUALITY - frequent dropped words/audio glitches throughout, likely a mic/connection issue on the presenter's end; summary reflects the identifiable topic flow] "Nagios Training Service team part2" -- continues directly from a prior Nagios session (recapping NRPE, NSClient, NCPA, and SNMP as the device-onboarding mechanisms already covered). Goes deeper into application-level and platform-level monitoring: using Nagios's built-in Oracle and MySQL database plugins directly rather than building custom checks; monitoring VMware at both the host and guest VM level. Introduces SNMP traps as a concept distinct from the polling-based checks used so far -- a trap is the monitored device proactively pushing an alert (e.g. "I've crossed 80% utilization") to Nagios rather than Nagios polling for it -- but explicitly recommends against using traps in most environments in favor of standard polling, flagging it mainly as something worth understanding conceptually since it may come up in questions. Walks through Nagios's config file structure directly on the server under `/usr/local`: `commands.cfg` for check-command definitions, and separate host/service definition files, with an explicit warning not to hand-edit certain auto-generated config files. Mentions a config/CRM-style ID system used to identify/relate hosts to specific customers. Given the significant transcript quality issues throughout this recording, finer procedural detail beyond this topic outline could not be reliably captured.