Nagios – IT Infrastructure Monitoring

Module 1: Introduction to Nagios

• IT monitoring fundamentals: availability, performance, and alerting
• Nagios overview: open-source infrastructure monitoring platform
• Nagios Core vs Nagios XI: open-source and commercial editions
• Nagios architecture: core daemon, plugins, and web interface

Module 2: Nagios Installation and Configuration

• Installing Nagios Core on Linux: dependencies and compilation
• Nagios configuration files: nagios.cfg, cgi.cfg, and object files
• Object definitions: hosts, services, contacts, and time periods
• Configuring the Nagios web interface: Apache and CGI setup

Module 3: Hosts and Services

• Host definitions: address, check command, and notification settings
• Host groups: organising hosts by location, function, or environment
• Service definitions: linking checks to hosts with thresholds
• Service groups: grouping related services for reporting and alerting

Module 4: Nagios Plugins

• Plugin architecture: how Nagios executes checks and interprets results
• Built-in plugins: check_ping, check_http, check_disk, and check_load
• NRPE: Nagios Remote Plugin Executor for agent-based checks
• Writing custom plugins: shell script and Python plugin development

Module 5: Notifications and Escalations

• Contact and contact group definitions for alert routing
• Notification commands: email, SMS, and PagerDuty integration
• Notification filters: time periods, states, and frequency limits
• Escalations: escalating unacknowledged alerts to senior contacts

Module 6: Performance Data and Graphing

• Performance data: enabling and collecting plugin performance output
• PNP4Nagios: graphing performance data with RRDtool
• Nagiosgraph: alternative performance graphing integration
• Capacity planning: trending historical performance data

Module 7: Advanced Nagios Features

• Passive checks: accepting external check results with NSCA
• Freshness checking: detecting stale passive check results
• Distributed monitoring: Nagios in a distributed and redundant setup
• Event handlers: automated remediation triggered by state changes

Module 8: Capstone Project and Assessment

• Nagios setup: hosts, services, contacts, and NRPE agent checks
• Custom plugin: Python-based application health check
• Escalation and event handler configuration project
• Final assessment and course certification

Experience in the Industry Learn from Nagios administrators who have monitored IT infrastructure including servers, network devices, applications, and cloud services for enterprises across telecommunications, finance, and managed service providers.

Backgrounds at the Top Our Nagios trainers have worked at NOC (Network Operations Centre) teams and IT operations departments where Nagios is the backbone of 24/7 infrastructure monitoring and alerting programmes.

Clear & Effective Teaching Nagios Core architecture, host and service configuration, plugins, NRPE, notifications, escalations, performance graphing, passive checks, distributed monitoring, and event handlers are explained with real monitoring examples.

Hands-On Learning Focus Students install Nagios, configure hosts and services, set up NRPE agents, write custom plugins, configure alert escalations, and integrate performance graphing through structured hands-on Nagios lab exercises.

Up-to-Date Knowledge Trainers keep content current with the latest Nagios Core and XI releases, Nagios monitoring for cloud infrastructure, and evolving IT infrastructure monitoring and alerting best practices.