DevOps Classroomnotes 05/May/2023

Pull vs Push Monitoring

• Pull Monitoring: Monitoring System pulls the information from various servers/applications/network devices the metrics.
  
• Push Monitoring: Monitoring system get the information from various servers/applications
  
• Examples
  • Pull:
    • Prometheus
    • Nagios
  • Push:
    • Log stash
    • splunk

Elastic Stack

• This was called as ELK Stack
• ELK
  • E = Elastic Search
  • L = Log Stash
  • K = Kibana
• Architecture
  
• Elastic Search: This is memory or storage system in the Elastic Stack
• Logstash: Responsible for making logs queryable
• Beats: Export metrics, logs, traces to Elastic Search
• Kibana: Creates dashboards and visualizations

Google for the following

• What are popular metrics for
  • web server (apache)
  • database (mysql)
• Web Servers
  • Requests per second
  • Errors
  • Thread count
  • Response Time (Average)
• Server:
  • CPU Uilization
  • Free Memory/Used Memory
  • Disk Space
  • Disk I/O
  • Network
    • Incoming
    • Outgoing
• Databases:
  • Number of Connetions
  • Size of Data Processed per second
  • Database Size