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Effectiveness tips from Kubernetes trenches by Captain Obvious

Mikalai Alimenkou
Mikalai Alimenkou
Mikalai AlimenkouIndependent Consultant at XP Injection

Nowadays almost everybody knows about Kubernetes, some teams are using it and some are only dreaming about it. Despite the popularity, Kubernetes is not simple and there are so many ways of abuse this peaceful technology. In this talk I would like to present quite obvious set of tips, based on failures and ineffectiveness at different companies I have worked with during last several years.

Effectiveness tips from Kubernetes trenches by Captain Obvious

1 of 34
Effectiveness tips from K8S
trenches by Captain Obvious
Mikalai Alimenkou
@xpinjection
https://t.me/xpinjection_channel
https://xpinjection.com
Effectiveness tips from Kubernetes trenches by Captain Obvious
Telegram channel
https://t.me/xpinjection_channel
Disclaimer
This talk is based on
personal experience
K8S is an orchestration flagman
Everything is so simple…
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Effectiveness tips from Kubernetes trenches by Captain Obvious

  • 1. Effectiveness tips from K8S trenches by Captain Obvious Mikalai Alimenkou @xpinjection https://t.me/xpinjection_channel https://xpinjection.com
  • 4. Disclaimer This talk is based on personal experience
  • 5. K8S is an orchestration flagman
  • 6. Everything is so simple…
  • 7. But reality is not always the same
  • 8. Feel the difference Deploy single microservice to Kubernetes Deploy and maintain production workload to Kubernetes
  • 9. All tips are really obvious
  • 10. #1. Don’t start with K8S ;)
  • 11. Focus on business first Don’t invest into complex infrastructure from start Use PaaS cloud solutions if possible “Buy” more time for business focus Containerize your services for flexibility Experiment with K8S on local dev environments
  • 12. #2. Develop Cloud Native services
  • 13. Use best practices and enablers Choose Cloud Native platform if possible Follow best practices for 12+ factor applications Use available enablers and libraries Focus on the most important aspects: - flexible configuration; - full observability; - stateless. You could migrate anywhere later
  • 14. #3. Avoid K8S maintenance
  • 15. Delegate complexity Build on managed K8S where possible Try K8S wrappers instead of vanilla K8S Use public Helm charts for dependencies Try public K8S operators to delegate maintenance for dependencies as well Use service mesh if don’t want to rely on developers level and use cross-language microservices
  • 16. #4. Switch to declarative mindset
  • 17. Forget imperative habits from the past All K8S resources are just declarations OK response on API call means resource is accepted Avoid imperative commands for all types of action Deployment may fail even at container level Use extended monitoring to control actual state of the cluster Log kubernetes.io/change-cause for deployment traceability
  • 18. #5. Don’t be hype-driven maniacs NO ROOM FOR LEGACY!
  • 19. Keep you platform as simple as possible Service mesh is great but not for everybody Every new component increases maintenance cost Start with plain K8S manifests Use templating and customization if more flexibility is required Switch to Helm only in complex cases
  • 20. #6. Define clear roles/responsibilities
  • 21. Establish clear DevOps boundaries Infrastructure engineers responsible for low level infrastructure (cloud, bare metal, mixed) Dedicated K8S engineers responsible for K8S platform Developers responsible for their services deployment, configuration and support SRE engineers responsible for SRE practices and toolset establishment
  • 24. #7. Implement business health checks
  • 25. Don’t be lazy developer Don’t rely on simple HTTP ping Distinguish liveness and readiness probes Be careful with returned HTTP status Add business context to liveness and readiness probes Implement and configure graceful shutdown where possible
  • 26. #8. Simplify dev environments
  • 27. Provide environments for all needs Share data storages between environments if possible Make environment lightweight to use everywhere (feature branches, pull requests, CI builds, dev/qa/demo) Share the same K8S cluster with isolated namespaces Use node level cache for quick start Automate environment setup for developers Use CD tools like scaffold for development speed
  • 28. #9. Don’t forget about limits
  • 29. Defaults bring hidden issues Define RAM/CPU requirements for all services Limit resources usage per namespace Be careful with default network policy Complex network setup requires special skills Pay attention to security guidelines Apply strict access policies Use dedicated clusters for isolated environments
  • 30. #10. Not all nodes are equal
  • 31. K8S is not about “commodity hardware” Use labels for nodes to control deployment specifics (storage type, node size, CPU capacity, etc.) Carefully choose node size, taking into account all sidecar containers and daemon sets Save money on spot instances for dev environments Don’t forget about latency and volume speed for data storages Use node level caches to speed up deployments
  • 33. Summary and take aways K8S is great orchestration tool, but not given for free Containerized Cloud Native services run everywhere New roles needed to set proper DevOps boundaries K8S ecosystem is hype-driven and growing very quickly Environment should be really easy to start Everything is still working on hardware Pay special attention to security and network

Editor's Notes

  1. Не может быть волшебных практик как Continuous Delivery. Вжух и уже есть CD! Это требует изменений на культурном уровне. Поэтому переименование ролей никак не помогает что-то улучшать.