Monitoring Containers Correctly

Michael Kehoe walks you through building a small monitoring utility for cgroup containers to illustrate best practices in container monitoring. You'll explore various cgroup constraints and learn how to specifically monitor for each of them to ensure that your application is behaving as expected. Along the way, Michael shares tricks and tips about monitoring containerized applications.

Transcript

1. Monitoring Containers Correctly Michael Kehoe Staff Site Reliability Engineer https://github.com/michael-kehoe/container-monitoring-workshop
2. Getting Started • Setup your workshop platform: • https://app.strigo.io/event/QXDpmTiRAuf Q4LBis • Token: F7C7 • Background slides: https://bit.ly/2NcEBQN • Code repo: https://github.com/michael- kehoe/container-monitoring-workshop • Please let me know ASAP if you’re having problems
3. Today’s agenda 1 Introductions 2 Container Primitives 3 What we’ll monitor 4 Cgroup interface file formats 5 Exercises
4. Today’s agenda Exercises 100 CPU Basics 101 CPU Enhanced 102 CPU Advanced 200 Memory Basics 201 Memory Enhanced 300 IO Basics 400 PID
5. Michael Kehoe $ WHOAMI • Staff Site Reliability Engineer @ LinkedIn • Production-SRE Team • Funny accent = Australian + 4 years American • Worked on: • Networks • Micro-services • Traffic Engineering • Databases
6. Production-SRE Team @ LinkedIn $ WHOAMI • Disaster Recovery - Planning & Automation • Incident Response – Process & Automation • Visibility Engineering – Making use of operational data • Reliability Principles – Defining best practice & automating it
7. Container Primitives
8. Containers Limiting the resources that can be used by a process/ set of processes cgroups Isolating filesystem resources Namespaces Implicit sharing or shadowing Copy on Write Locking down container privileges Linux Security Modules
9. Cgroup • Abbreviation for ‘Control Groups’ • Provides • Resource Limiting • Prioritization • Accounting • Control
10. What we’ll monitor
11. • 100: Basic cgroup CPU utilization • 101: Enhanced cgroup CPU utilization (with percentiles • 102: cgroup throttles What we’ll monitor CPU
12. • 200: Memory Basics • Cgroup utilization • 201: Enhanced Memory Metrics What we’ll monitor MEMORY
13. • 300: Disk IO Monitoring What we’ll monitor DISK/ NETWORK
14. • 400: PID Utilization What we’ll monitor PID
15. Cgroup interface file formats
16. Cgroup interface file formats https://www.kernel.org/doc/Documentation/cgroup-v2.txt
17. Exercises
18. 100: CPU Monitoring
19. 101: Enhanced CPU Monitoring
20. Enhanced CPU Monitoring
21. 102: CPU Advanced Monitoring
22. Advanced CPU Monitoring
23. 200: Memory Basics
24. 201: Memory Enhanced
25. 300: Disk IO Basics
26. 400: PID Monitoring