Monitoring

System Monitoring

• Monitor Basic System Details
  • Is Server Up
  • Is Http Page responding
  • Is Datbase Query Responding
  • Whats the free disk space at that moment
  • What is CPU Utilization at that moment
  • What is Network load at that moment
  • What is Disk IO Activity at that moment
• It can be completely our responsibility (DevOps/SRE)
• Tools:
  • Nagios
  • Zabbix
  • Icinga

Application Monitoring

• Detailed monitoring of your application
  • How much memory is my application consuming
  • Whats the current number of concurrent users on my application
  • What are my applications logs speaking
  • What are my applications traces telling
  • What are failure patterns
• Need collaboration with Dev to accomplish this monitoring
• Tools:
  • Elastic Stack
  • Splunk
  • App Dynamics
  • Application Insights

Terms

• Metric: Some measurement in terms of units of System/Application. Eg CPU Utilization, Newtork In/Out
• Charts: Charts are metrics aggregated over time
• Logs:
  • System Logs
  • Application Logs
• Dashboard: A unified view of every thing that matters.
• Alert: concern about a system raised to person(s)

Expectations

• Health of the System
• Identify Failure Patterns
• Do analytics to suggest better customer experience.

SRE Expectations

• Reduce Noise and Alert on SLIs or SLOs
• Make your Monitoring Observable

Nagios

• Has two Versions
  • Core
  • Enterprise
• Nagios Core Installation:
  • Involves downloading Nagios Code
  • Building the Nagios Code
  • Configuring Nagios
  • For the above nagios uses make
• Nagios
  • Plugins
  • Commands