DevOps Classroom Series 29/Oct/2019

System Monitoring using Nagios

Terms

• Checks:
  • Active
  • Passive
• Servers: Host
• Commands:
• Contacts:
• Alerts:

Different Options of Nagios

• Nagios Core: Open Source
• Nagios XI : Commercial Version

Nagios Core

• Installation:
  1. Install Nagios by downloading the code and compiling
  2. Install Nagios Plugins by downloading the code and compiling
• References
  • Nagios Core
  • Nagios Core on Ubuntu

Configuration files

• In Nagios the main configuration file is nagios.cfg. This consits of nagios configurations like logs, other config locations, status update intervals.
• commands.cfg consists of reusable commands used to check the status and notify
• timeperiods.cfg consists of reusable timeperiods to run the checks
• contacts.cfg consists of user/group communication details

Status

• Failure
  • Soft Failure
  • Hard Failure
• OK
• Pending