DevOps Classroomnotes 07/Dec/2022

Sources for Monitoring

• Network Connectivity to Host/Device: This informs whether the server or device is up or not
  • Protocol: ICMP, TCP
  • Ip Address/fqdn (fully qualified domain name)
• Physical/Virtual Server Metrics:
  • CPU Utilization
  • Memory Utilization
  • Free disk space
  • Network I/O
  • Disk I/O
• Operating System Logs
  • Windows => Event viewer
  • Linux =>
    • /var/logs
    • Syslog service
    • journalctl
• Application Health Check/Probe
  • Alive/Not:
    • Http(s) request
    • Validate response
      • Status Code
        • 1xx = information
        • 2xx = Success
        • 3xx = Redirection
        • 4xx = client errors
        • 5xx = server side errors
• Application Logs
  • stdout, stderr => redirect logs to some file
  • linux => /var/logs
  • databases
• Tracing/APM: This is generally not enabled, we need to enable and run the application which will lead to APM (Application Performance Monitoring)
• Application Metrics
  • Requests
  • Error rate
  • Request sizes per second

Log Levels

• CRITICAL => Severe issue
• ERROR => Any failure in your application
• INFO => Informational log
• DEBUG => Logs with low level details
• VERBOSE => Logs literally everything.

Tools for monitoring

• Server Monitoring
  • Nagios
  • Zabbix
  • Elastic Stack
• Application Log Monitoring
  • Splunk
  • Elastic Stack
• APM:
  • App Dynamics
  • New Relic
  • Elastic Stack
• Alerting Options/Notifications:
  • Email
  • Push
  • SMS
  • SIEM
  • Communication Channel
    • Slack
    • Teams

Elastic Stack

• This is collection of tools very popular in
  • Big Data
  • Log Analysis and Monitoring
• Elastic Stack is collection of tools
  • Elastic Search
  • Log Stash
  • Kibana
  • Beats
  • X-Pack

Elastic Stack Architecture