Course structure available

Stage 11 · Monitoring, Logging & Observability

Nagios Complete Course

Master Nagios Core from hosts, services, plugins, commands, checks, dependencies, and notifications through agents, SNMP, event handlers, distributed monitoring, performance data, security, automation, scaling, and production operations.

Browse curriculum View all chapters

NAG

37chapters

185lessons

Intermediatestarting level

Hands-onlearning mode

Course stateCurriculum ready

Course brief

A complete Nagios Core curriculum for deterministic host/service monitoring, plugin-driven checks, alert routing, network monitoring, automation, and reliable legacy-to-modern infrastructure operations.

This course is organized as a progressive operational curriculum. Lesson files are reserved in the repository structure so future content can be added without changing URLs or navigation.

By the end

You will be able to

Configure hosts, services, contacts, checks, templates, and dependencies
Use and develop Nagios plugins for systems, networks, applications, and custom metrics
Deploy NCPA, NRPE, SNMP, passive checks, and distributed monitoring patterns
Design notification, escalation, downtime, acknowledgement, and event-handler workflows
Secure, automate, scale, upgrade, troubleshoot, and recover Nagios Core

Complete syllabus

37 chapters in prerequisite order.

The structure goes beyond a command reference and includes architecture, security, reliability, troubleshooting, automation, governance, and production operations.

Chapter 1

Infrastructure Monitoring Foundations and the Nagios Ecosystem

5 lessons

Infrastructure Monitoring Foundations and the Nagios Ecosystem: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Infrastructure Monitoring Foundations and the Nagios Ecosystem: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Infrastructure Monitoring Foundations and the Nagios Ecosystem: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Infrastructure Monitoring Foundations and the Nagios Ecosystem: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Infrastructure Monitoring Foundations and the Nagios EcosystemReserved in course structure

Planned

Chapter 2

Nagios Core 4.5 Architecture, Components, Licensing, and Release Lifecycle

5 lessons

Nagios Core 4.5 Architecture, Components, Licensing, and Release Lifecycle: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Nagios Core 4.5 Architecture, Components, Licensing, and Release Lifecycle: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Nagios Core 4.5 Architecture, Components, Licensing, and Release Lifecycle: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Nagios Core 4.5 Architecture, Components, Licensing, and Release Lifecycle: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Nagios Core 4.5 Architecture, Components, Licensing, and Release LifecycleReserved in course structure

Planned

Chapter 3

Installing Nagios Core from Packages/Source and Building a Lab

5 lessons

Installing Nagios Core from Packages/Source and Building a Lab: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Installing Nagios Core from Packages/Source and Building a Lab: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Installing Nagios Core from Packages/Source and Building a Lab: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Installing Nagios Core from Packages/Source and Building a Lab: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Installing Nagios Core from Packages/Source and Building a LabReserved in course structure

Planned

Chapter 4

Core Configuration Files, Object Configuration, Includes, and Validation

5 lessons

Core Configuration Files, Object Configuration, Includes, and Validation: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Core Configuration Files, Object Configuration, Includes, and Validation: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Core Configuration Files, Object Configuration, Includes, and Validation: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Core Configuration Files, Object Configuration, Includes, and Validation: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Core Configuration Files, Object Configuration, Includes, and ValidationReserved in course structure

Planned

Chapter 5

Hosts, Services, States, HARD/SOFT State, and Check Lifecycle

5 lessons

Hosts, Services, States, HARD/SOFT State, and Check Lifecycle: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Hosts, Services, States, HARD/SOFT State, and Check Lifecycle: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Hosts, Services, States, HARD/SOFT State, and Check Lifecycle: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Hosts, Services, States, HARD/SOFT State, and Check Lifecycle: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Hosts, Services, States, HARD/SOFT State, and Check LifecycleReserved in course structure

Planned

Chapter 6

Host and Service Templates, Inheritance, Custom Variables, and Reuse

5 lessons

Host and Service Templates, Inheritance, Custom Variables, and Reuse: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Host and Service Templates, Inheritance, Custom Variables, and Reuse: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Host and Service Templates, Inheritance, Custom Variables, and Reuse: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Host and Service Templates, Inheritance, Custom Variables, and Reuse: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Host and Service Templates, Inheritance, Custom Variables, and ReuseReserved in course structure

Planned

Chapter 7

Commands, Command Definitions, Macros, Arguments, and Safe Execution

5 lessons

Commands, Command Definitions, Macros, Arguments, and Safe Execution: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Commands, Command Definitions, Macros, Arguments, and Safe Execution: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Commands, Command Definitions, Macros, Arguments, and Safe Execution: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Commands, Command Definitions, Macros, Arguments, and Safe Execution: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Commands, Command Definitions, Macros, Arguments, and Safe ExecutionReserved in course structure

Planned

Chapter 8

Nagios Plugins Architecture, Return Codes, Output, and Performance Data

5 lessons

Nagios Plugins Architecture, Return Codes, Output, and Performance Data: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Nagios Plugins Architecture, Return Codes, Output, and Performance Data: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Nagios Plugins Architecture, Return Codes, Output, and Performance Data: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Nagios Plugins Architecture, Return Codes, Output, and Performance Data: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Nagios Plugins Architecture, Return Codes, Output, and Performance DataReserved in course structure

Planned

Chapter 9

Official Plugins, check_ping, check_http, check_ssh, check_dns, and System Checks

5 lessons

Official Plugins, check_ping, check_http, check_ssh, check_dns, and System Checks: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Official Plugins, check_ping, check_http, check_ssh, check_dns, and System Checks: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Official Plugins, check_ping, check_http, check_ssh, check_dns, and System Checks: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Official Plugins, check_ping, check_http, check_ssh, check_dns, and System Checks: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Official Plugins, check_ping, check_http, check_ssh, check_dns, and System ChecksReserved in course structure

Planned

Chapter 10

Plugin Development in Bash, Python, and Other Languages

5 lessons

Plugin Development in Bash, Python, and Other Languages: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Plugin Development in Bash, Python, and Other Languages: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Plugin Development in Bash, Python, and Other Languages: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Plugin Development in Bash, Python, and Other Languages: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Plugin Development in Bash, Python, and Other LanguagesReserved in course structure

Planned

Chapter 11

Active Checks, Scheduling, Check Intervals, Retry Intervals, and Freshness

5 lessons

Active Checks, Scheduling, Check Intervals, Retry Intervals, and Freshness: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Active Checks, Scheduling, Check Intervals, Retry Intervals, and Freshness: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Active Checks, Scheduling, Check Intervals, Retry Intervals, and Freshness: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Active Checks, Scheduling, Check Intervals, Retry Intervals, and Freshness: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Active Checks, Scheduling, Check Intervals, Retry Intervals, and FreshnessReserved in course structure

Planned

Chapter 12

Passive Checks, External Commands, NSCA Concepts, and Event Ingestion

5 lessons

Passive Checks, External Commands, NSCA Concepts, and Event Ingestion: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Passive Checks, External Commands, NSCA Concepts, and Event Ingestion: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Passive Checks, External Commands, NSCA Concepts, and Event Ingestion: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Passive Checks, External Commands, NSCA Concepts, and Event Ingestion: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Passive Checks, External Commands, NSCA Concepts, and Event IngestionReserved in course structure

Planned

Chapter 13

NCPA Agent, API, Active/Passive Checks, Windows/Linux/macOS Monitoring

5 lessons

NCPA Agent, API, Active/Passive Checks, Windows/Linux/macOS Monitoring: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

NCPA Agent, API, Active/Passive Checks, Windows/Linux/macOS Monitoring: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

NCPA Agent, API, Active/Passive Checks, Windows/Linux/macOS Monitoring: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

NCPA Agent, API, Active/Passive Checks, Windows/Linux/macOS Monitoring: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — NCPA Agent, API, Active/Passive Checks, Windows/Linux/macOS MonitoringReserved in course structure

Planned

Chapter 14

NRPE Architecture, Remote Plugins, Security, and Legacy Estate Integration

5 lessons

NRPE Architecture, Remote Plugins, Security, and Legacy Estate Integration: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

NRPE Architecture, Remote Plugins, Security, and Legacy Estate Integration: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

NRPE Architecture, Remote Plugins, Security, and Legacy Estate Integration: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

NRPE Architecture, Remote Plugins, Security, and Legacy Estate Integration: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — NRPE Architecture, Remote Plugins, Security, and Legacy Estate IntegrationReserved in course structure

Planned

Chapter 15

SNMP Fundamentals, OIDs, v2c/v3, Devices, Interfaces, and Network Monitoring

5 lessons

SNMP Fundamentals, OIDs, v2c/v3, Devices, Interfaces, and Network Monitoring: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

SNMP Fundamentals, OIDs, v2c/v3, Devices, Interfaces, and Network Monitoring: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

SNMP Fundamentals, OIDs, v2c/v3, Devices, Interfaces, and Network Monitoring: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

SNMP Fundamentals, OIDs, v2c/v3, Devices, Interfaces, and Network Monitoring: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — SNMP Fundamentals, OIDs, v2c/v3, Devices, Interfaces, and Network MonitoringReserved in course structure

Planned

Chapter 16

Windows Monitoring, NCPA, NSClient++ Concepts, Services, Processes, and Event Logs

5 lessons

Windows Monitoring, NCPA, NSClient++ Concepts, Services, Processes, and Event Logs: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Windows Monitoring, NCPA, NSClient++ Concepts, Services, Processes, and Event Logs: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Windows Monitoring, NCPA, NSClient++ Concepts, Services, Processes, and Event Logs: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Windows Monitoring, NCPA, NSClient++ Concepts, Services, Processes, and Event Logs: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Windows Monitoring, NCPA, NSClient++ Concepts, Services, Processes, and Event LogsReserved in course structure

Planned

Chapter 17

Linux/Unix Monitoring, CPU, Memory, Disk, Processes, Services, and Logs

5 lessons

Linux/Unix Monitoring, CPU, Memory, Disk, Processes, Services, and Logs: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Linux/Unix Monitoring, CPU, Memory, Disk, Processes, Services, and Logs: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Linux/Unix Monitoring, CPU, Memory, Disk, Processes, Services, and Logs: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Linux/Unix Monitoring, CPU, Memory, Disk, Processes, Services, and Logs: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Linux/Unix Monitoring, CPU, Memory, Disk, Processes, Services, and LogsReserved in course structure

Planned

Chapter 18

Website, HTTP, HTTPS, DNS, SMTP, SSH, Databases, and Application Monitoring

5 lessons

Website, HTTP, HTTPS, DNS, SMTP, SSH, Databases, and Application Monitoring: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Website, HTTP, HTTPS, DNS, SMTP, SSH, Databases, and Application Monitoring: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Website, HTTP, HTTPS, DNS, SMTP, SSH, Databases, and Application Monitoring: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Website, HTTP, HTTPS, DNS, SMTP, SSH, Databases, and Application Monitoring: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Website, HTTP, HTTPS, DNS, SMTP, SSH, Databases, and Application MonitoringReserved in course structure

Planned

Chapter 19

Host Parents, Network Reachability, DOWN vs UNREACHABLE, and Topology

5 lessons

Host Parents, Network Reachability, DOWN vs UNREACHABLE, and Topology: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Host Parents, Network Reachability, DOWN vs UNREACHABLE, and Topology: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Host Parents, Network Reachability, DOWN vs UNREACHABLE, and Topology: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Host Parents, Network Reachability, DOWN vs UNREACHABLE, and Topology: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Host Parents, Network Reachability, DOWN vs UNREACHABLE, and TopologyReserved in course structure

Planned

Chapter 20

Service and Host Dependencies, Execution Dependencies, and Notification Dependencies

5 lessons

Service and Host Dependencies, Execution Dependencies, and Notification Dependencies: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Service and Host Dependencies, Execution Dependencies, and Notification Dependencies: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Service and Host Dependencies, Execution Dependencies, and Notification Dependencies: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Service and Host Dependencies, Execution Dependencies, and Notification Dependencies: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Service and Host Dependencies, Execution Dependencies, and Notification DependenciesReserved in course structure

Planned

Chapter 21

Contacts, Contact Groups, Notification Commands, and Alert Routing

5 lessons

Contacts, Contact Groups, Notification Commands, and Alert Routing: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Contacts, Contact Groups, Notification Commands, and Alert Routing: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Contacts, Contact Groups, Notification Commands, and Alert Routing: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Contacts, Contact Groups, Notification Commands, and Alert Routing: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Contacts, Contact Groups, Notification Commands, and Alert RoutingReserved in course structure

Planned

Chapter 22

Notification Escalations, Time Periods, On-Call Design, and Noise Reduction

5 lessons

Notification Escalations, Time Periods, On-Call Design, and Noise Reduction: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Notification Escalations, Time Periods, On-Call Design, and Noise Reduction: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Notification Escalations, Time Periods, On-Call Design, and Noise Reduction: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Notification Escalations, Time Periods, On-Call Design, and Noise Reduction: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Notification Escalations, Time Periods, On-Call Design, and Noise ReductionReserved in course structure

Planned

Chapter 23

Acknowledgements, Scheduled Downtime, Flapping Detection, and Maintenance

5 lessons

Acknowledgements, Scheduled Downtime, Flapping Detection, and Maintenance: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Acknowledgements, Scheduled Downtime, Flapping Detection, and Maintenance: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Acknowledgements, Scheduled Downtime, Flapping Detection, and Maintenance: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Acknowledgements, Scheduled Downtime, Flapping Detection, and Maintenance: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Acknowledgements, Scheduled Downtime, Flapping Detection, and MaintenanceReserved in course structure

Planned

Chapter 24

Event Handlers, Automated Remediation, Safety Controls, and Recovery Actions

5 lessons

Event Handlers, Automated Remediation, Safety Controls, and Recovery Actions: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Event Handlers, Automated Remediation, Safety Controls, and Recovery Actions: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Event Handlers, Automated Remediation, Safety Controls, and Recovery Actions: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Event Handlers, Automated Remediation, Safety Controls, and Recovery Actions: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Event Handlers, Automated Remediation, Safety Controls, and Recovery ActionsReserved in course structure

Planned

Chapter 25

Performance Data, Graphing Integrations, PNP Concepts, and Metric Export

5 lessons

Performance Data, Graphing Integrations, PNP Concepts, and Metric Export: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Performance Data, Graphing Integrations, PNP Concepts, and Metric Export: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Performance Data, Graphing Integrations, PNP Concepts, and Metric Export: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Performance Data, Graphing Integrations, PNP Concepts, and Metric Export: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Performance Data, Graphing Integrations, PNP Concepts, and Metric ExportReserved in course structure

Planned

Chapter 26

Nagios Web Interface, CGIs, Authentication, Authorization, and Status Views

5 lessons

Nagios Web Interface, CGIs, Authentication, Authorization, and Status Views: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Nagios Web Interface, CGIs, Authentication, Authorization, and Status Views: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Nagios Web Interface, CGIs, Authentication, Authorization, and Status Views: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Nagios Web Interface, CGIs, Authentication, Authorization, and Status Views: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Nagios Web Interface, CGIs, Authentication, Authorization, and Status ViewsReserved in course structure

Planned

Chapter 27

Object Cache, Retention Data, Status Data, Logs, Archives, and Runtime State

5 lessons

Object Cache, Retention Data, Status Data, Logs, Archives, and Runtime State: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Object Cache, Retention Data, Status Data, Logs, Archives, and Runtime State: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Object Cache, Retention Data, Status Data, Logs, Archives, and Runtime State: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Object Cache, Retention Data, Status Data, Logs, Archives, and Runtime State: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Object Cache, Retention Data, Status Data, Logs, Archives, and Runtime StateReserved in course structure

Planned

Chapter 28

Event Broker Module Architecture, NEB Modules, NDO Concepts, and Integrations

5 lessons

Event Broker Module Architecture, NEB Modules, NDO Concepts, and Integrations: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Event Broker Module Architecture, NEB Modules, NDO Concepts, and Integrations: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Event Broker Module Architecture, NEB Modules, NDO Concepts, and Integrations: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Event Broker Module Architecture, NEB Modules, NDO Concepts, and Integrations: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Event Broker Module Architecture, NEB Modules, NDO Concepts, and IntegrationsReserved in course structure

Planned

Chapter 29

Distributed Monitoring, Mod-Gearman Concepts, Remote Workers, and Scaling

5 lessons

Distributed Monitoring, Mod-Gearman Concepts, Remote Workers, and Scaling: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Distributed Monitoring, Mod-Gearman Concepts, Remote Workers, and Scaling: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Distributed Monitoring, Mod-Gearman Concepts, Remote Workers, and Scaling: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Distributed Monitoring, Mod-Gearman Concepts, Remote Workers, and Scaling: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Distributed Monitoring, Mod-Gearman Concepts, Remote Workers, and ScalingReserved in course structure

Planned

Chapter 30

Redundancy, Failover, Active/Passive Core, and High-Availability Patterns

5 lessons

Redundancy, Failover, Active/Passive Core, and High-Availability Patterns: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Redundancy, Failover, Active/Passive Core, and High-Availability Patterns: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Redundancy, Failover, Active/Passive Core, and High-Availability Patterns: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Redundancy, Failover, Active/Passive Core, and High-Availability Patterns: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Redundancy, Failover, Active/Passive Core, and High-Availability PatternsReserved in course structure

Planned

Chapter 31

Configuration Generation, Automation, APIs/External Commands, and GitOps-Style Management

5 lessons

Configuration Generation, Automation, APIs/External Commands, and GitOps-Style Management: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Configuration Generation, Automation, APIs/External Commands, and GitOps-Style Management: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Configuration Generation, Automation, APIs/External Commands, and GitOps-Style Management: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Configuration Generation, Automation, APIs/External Commands, and GitOps-Style Management: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Configuration Generation, Automation, APIs/External Commands, and GitOps-Style ManagementReserved in course structure

Planned

Chapter 32

Docker/Kubernetes Monitoring Patterns and Modern Infrastructure Integration

5 lessons

Docker/Kubernetes Monitoring Patterns and Modern Infrastructure Integration: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Docker/Kubernetes Monitoring Patterns and Modern Infrastructure Integration: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Docker/Kubernetes Monitoring Patterns and Modern Infrastructure Integration: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Docker/Kubernetes Monitoring Patterns and Modern Infrastructure Integration: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Docker/Kubernetes Monitoring Patterns and Modern Infrastructure IntegrationReserved in course structure

Planned

Chapter 33

Security Hardening, CGI/CSRF Awareness, Credentials, File Permissions, and Least Privilege

5 lessons

Security Hardening, CGI/CSRF Awareness, Credentials, File Permissions, and Least Privilege: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Security Hardening, CGI/CSRF Awareness, Credentials, File Permissions, and Least Privilege: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Security Hardening, CGI/CSRF Awareness, Credentials, File Permissions, and Least Privilege: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Security Hardening, CGI/CSRF Awareness, Credentials, File Permissions, and Least Privilege: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Security Hardening, CGI/CSRF Awareness, Credentials, File Permissions, and Least PrivilegeReserved in course structure

Planned

Chapter 34

Performance Tuning, Check Concurrency, Scheduling, Workers, and Large Installations

5 lessons

Performance Tuning, Check Concurrency, Scheduling, Workers, and Large Installations: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Performance Tuning, Check Concurrency, Scheduling, Workers, and Large Installations: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Performance Tuning, Check Concurrency, Scheduling, Workers, and Large Installations: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Performance Tuning, Check Concurrency, Scheduling, Workers, and Large Installations: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Performance Tuning, Check Concurrency, Scheduling, Workers, and Large InstallationsReserved in course structure

Planned

Chapter 35

Troubleshooting Configuration, Plugins, Agents, Notifications, Performance, and Logs

5 lessons

Troubleshooting Configuration, Plugins, Agents, Notifications, Performance, and Logs: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Troubleshooting Configuration, Plugins, Agents, Notifications, Performance, and Logs: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Troubleshooting Configuration, Plugins, Agents, Notifications, Performance, and Logs: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Troubleshooting Configuration, Plugins, Agents, Notifications, Performance, and Logs: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Troubleshooting Configuration, Plugins, Agents, Notifications, Performance, and LogsReserved in course structure

Planned

Chapter 36

Backup, Restore, Upgrade, Migration to 4.5.x, and Nagios XI Awareness

5 lessons

Backup, Restore, Upgrade, Migration to 4.5.x, and Nagios XI Awareness: Concepts, Vocabulary, and Mental ModelReserved in course structure

Planned

Backup, Restore, Upgrade, Migration to 4.5.x, and Nagios XI Awareness: Guided Configuration and Hands-On WorkflowReserved in course structure

Planned

Backup, Restore, Upgrade, Migration to 4.5.x, and Nagios XI Awareness: Design Patterns, Trade-Offs, and Production DecisionsReserved in course structure

Planned

Backup, Restore, Upgrade, Migration to 4.5.x, and Nagios XI Awareness: Security, Diagnostics, Failure Modes, and TroubleshootingReserved in course structure

Planned

Checkpoint Lab — Backup, Restore, Upgrade, Migration to 4.5.x, and Nagios XI AwarenessReserved in course structure

Planned

Chapter 37

Production Capstone: Design, Secure, Scale, Alert, Automate, and Recover Nagios Core

5 lessons

Capstone Requirements, Architecture, SLOs, and Success CriteriaReserved in course structure

Planned

Build the End-to-End Monitoring or Delivery EnvironmentReserved in course structure

Planned

Integrate Security, Automation, Governance, and ObservabilityReserved in course structure

Planned

Inject Failures, Diagnose Behavior, Recover Safely, and Verify StateReserved in course structure

Planned

Final Validation, Runbook, Operational Handoff, and Improvement BacklogReserved in course structure

Planned

Keep the academy open

Support free, practical DevOps education.

Every lesson is designed to remain readable in a browser, downloadable from GitHub, and usable without a paid learning platform. Contributions help expand and maintain the curriculum.

Ethereum / ERC-20

0x716c4Ab160C4B66F31a28AE2448BfF68fc3a2ef0 Send only Ethereum/ERC-20 compatible assets to this address.

Nagios Complete Course

A complete Nagios Core curriculum for deterministic host/service monitoring, plugin-driven checks, alert routing, network monitoring, automation, and reliable legacy-to-modern infrastructure operations.

You will be able to

37 chapters in prerequisite order.

Infrastructure Monitoring Foundations and the Nagios Ecosystem

Nagios Core 4.5 Architecture, Components, Licensing, and Release Lifecycle

Installing Nagios Core from Packages/Source and Building a Lab

Core Configuration Files, Object Configuration, Includes, and Validation

Hosts, Services, States, HARD/SOFT State, and Check Lifecycle

Host and Service Templates, Inheritance, Custom Variables, and Reuse

Commands, Command Definitions, Macros, Arguments, and Safe Execution

Nagios Plugins Architecture, Return Codes, Output, and Performance Data

Official Plugins, check_ping, check_http, check_ssh, check_dns, and System Checks

Plugin Development in Bash, Python, and Other Languages

Active Checks, Scheduling, Check Intervals, Retry Intervals, and Freshness

Passive Checks, External Commands, NSCA Concepts, and Event Ingestion

NCPA Agent, API, Active/Passive Checks, Windows/Linux/macOS Monitoring

NRPE Architecture, Remote Plugins, Security, and Legacy Estate Integration

SNMP Fundamentals, OIDs, v2c/v3, Devices, Interfaces, and Network Monitoring

Windows Monitoring, NCPA, NSClient++ Concepts, Services, Processes, and Event Logs

Linux/Unix Monitoring, CPU, Memory, Disk, Processes, Services, and Logs

Website, HTTP, HTTPS, DNS, SMTP, SSH, Databases, and Application Monitoring

Host Parents, Network Reachability, DOWN vs UNREACHABLE, and Topology

Service and Host Dependencies, Execution Dependencies, and Notification Dependencies

Contacts, Contact Groups, Notification Commands, and Alert Routing

Notification Escalations, Time Periods, On-Call Design, and Noise Reduction

Acknowledgements, Scheduled Downtime, Flapping Detection, and Maintenance

Event Handlers, Automated Remediation, Safety Controls, and Recovery Actions

Performance Data, Graphing Integrations, PNP Concepts, and Metric Export

Nagios Web Interface, CGIs, Authentication, Authorization, and Status Views

Object Cache, Retention Data, Status Data, Logs, Archives, and Runtime State

Event Broker Module Architecture, NEB Modules, NDO Concepts, and Integrations

Distributed Monitoring, Mod-Gearman Concepts, Remote Workers, and Scaling

Redundancy, Failover, Active/Passive Core, and High-Availability Patterns

Configuration Generation, Automation, APIs/External Commands, and GitOps-Style Management

Docker/Kubernetes Monitoring Patterns and Modern Infrastructure Integration

Security Hardening, CGI/CSRF Awareness, Credentials, File Permissions, and Least Privilege

Performance Tuning, Check Concurrency, Scheduling, Workers, and Large Installations

Troubleshooting Configuration, Plugins, Agents, Notifications, Performance, and Logs

Backup, Restore, Upgrade, Migration to 4.5.x, and Nagios XI Awareness

Production Capstone: Design, Secure, Scale, Alert, Automate, and Recover Nagios Core

No lesson matches that search.

Support free, practical DevOps education.