CNCF JLM Meetup - Making Peace With the Grim Reaper

Learn all about liveness and readiness probes (done right) from Guy Menachem - Solution Architect at Komodor, the first Kubernetes-native troubleshooting platform, with vast experience working with DBs from old-timey mainframes to cloud-native systems.

Transcript

1. Komodor <> Epsagon | May 2021 Guy Menahem Solution Architect @ Komodor Making Peace With The Grim Reaper Liveness & Readiness Probes Done Right
2. Cloud native | March 2021 • A Developer turned Solution Architect • Working at Komodor, a startup building the first K8s-native troubleshooting platform • Love everything in infrastructure: storage, networks & security - from 70’s era mainframes to cloud-native • All about “plan well, sleep well” Who am I?
3. Investors | January 2021 WTF Are Probes? Probe Types • Liveness - When to restart a container • Readiness - When to send requests • Startup - When the initial setup is done Overview A probe is a diagnostic performed periodically by the kubelet on a container. To perform a diagnostic, the kubelet either executes code within the container, or makes a network request.
4. Investors | January 2021 WTF Are Probes? Probes under the hood: The Happy Flow The Bad Flow
5. Investors | January 2021 WTF Are Probes? Why Should You Care? 1. Has direct impact on the app’s availability 2. Can be useful when troubleshooting
6. Investors | January 2021 What Could Possibly Go Wrong? 1. Undetected Downtime - Your app is down but traffic is being sent to it anyway. (you forgot to call the Grim Reaper)
7. Investors | January 2021 What Could Possibly Go Wrong? 1. Undetected Downtime - Your app is down but traffic is being sent to it anyway. (you forgot to call the Grim Reaper) 2. Unwanted Downtime - Your app runs well but Kubernetes restarts it continuously or doesn’t send traffic (you sacrifice an innocent soul to the Reaper) 3. Unexpected Behavour - Your app doesn’t match your needs - startup, delay, failure tolerance, etc. (you don’t know when to call the Reaper)
8. Cloud native | March 2021 Best Practices For Kubernetes Probes
9. Investors | January 2021 1. Plan It • Liveness - Everything is loaded & runs fine • Liveness - Can recover from external failures • Readiness - Can serve the users • Readiness - Fail following external failures
10. Investors | January 2021 2. Configure It • Configure with failure thresholds • Make it aligned with your business/service needs
11. Investors | January 2021 3. Code It • Specific endpoint for each probe • Understand the state • Liveness - Everything that’s needed is loaded • Liveness - Can the app autorecover or it needs help? • Readiness - All the external services are accessible (DB, queues, other services) • Readiness - the main job can be done • Log everything • Avoid long startups
12. Troubleshoot Kubernetes With Confidence
13. Meet Komodor Reducing MTTR A single source of truth to uncover root causes quickly. Empowering Developers Enable every team member to troubleshoot independently. Simplifying the K8s Chaos Gain the relevant context & insights you need to troubleshoot faster. We’re a team of devs on a mission to transform K8s troubleshooting by:
14. Search through multiple tools to find the needle in the haystack Use kubectl to estimate your way to the root cause The Process of Troubleshooting K8s Today
15. How Komodor Makes K8s Troubleshooting Simple Gain Change Intelligence Runs automated checks and delivers remediation suggestions empowering all responders to troubleshoot independently. A single source of truth for all code & config changes, code diffs, deploys, alerts - displaying both real time & historical data. Shift Troubleshooting Left Uncover K8s Dependencies Gain the relevant insights behind a symptom, from the app layer (code change) to the infra layer (node resources). Uncover related components & understand cross-component changes to troubleshoot with the relevant context. Have 360° Visibility
16. Troubleshooting probes couldn’t be easier
17. Thanks for listening! Want to learn how you can troubleshoot K8s issues with ease? Then check us out at: www.komodor.com