Kubernetes Basics
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This document provides an overview of Kubernetes basics. It introduces Kubernetes as an open source container orchestration tool developed by Google to manage the lifecycle of containers. It describes common Kubernetes concepts like pods, deployments, services, and how to install Kubernetes on local, on-premise and cloud environments. It also covers important topics for production use such as health checks, resource restrictions, logging, monitoring and alerts.
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- 1. KUBERNETES BASICS Antonin Stoklasek | 29th October 2018
- 2. ANTONIN STOKLASEK • Technical Team Lead • Java, Docker, React … • Banking Software Company • Osomahe • Twitter @tonda100 • GitHub tonda100
- 3. AGENDA • What is kubernetes? • Basic elements • Logging and monitoring • Advanced topics
- 4. WHAT IS KUBERNETES • Orchestration for containers • Manages lifecycle of containers • Open Source (Go) • Developed by Google • Docker, rkt, etc.
- 5. INSTALLATION • Localhost – Docker, Minikube • On premise – own hardware • Cloud (AWS, GCE) – using kops, kadmin • Cloud Managed – EKS, GKE, AKS • Hybrid
- 6. KUBECTL • Command line interface • Manages Kubernetes cluster • Support – Windows, Linux, MacOS • https://kubernetes.io/docs/tasks/tools/install-kubectl/
- 7. TASK 1 • Install kubernetes cluster • Install kubectl • Verification command – “kubectl get nodes“
- 8. POD • Group of one or more containers • Tightly coupled • Communication via localhost • Smallest deployable unit
- 9. DEPLOYMENT • Definition of deployment • Multiple pods • Stateless deployment
- 10. SERVICE • Logical set of pods • Using label selector • Type • ClusterIP – default, reachable within the cluster • NodePort – expose service via port [30000-32767] • LoadBalancer – using cloud provider’s load balancer e.g. ELB
- 11. HEALTHCHECK • Part of pod definition • Running command in container • URL http checks • Liveness Probe – container is running • Rediness Probe – container is ready to serve trafic
- 12. RESOURCES • CPU and memory restrictions • Requests – necessary for container • Limits – maximum for container
- 13. SECRETS • Used for distribution – credentials, keys, passwords etc. • Usage • Environment variable • File in pod
- 14. WEB UI • web-based Kubernetes user interface • Similar set of operations as kubectl
- 15. CONFIGMAP • Configuration parameters - NOT secret • Contains • Key-value pairs • configuration files • Using for container customization
- 16. LOGGING • Centralized necessary • System output • Logging agents • ELK stack • LogDNA • Splunk • Fluentd
- 17. ALERTING & MONITORING • Must have • Prometheus + Kibana • Datadog • Instana • NewRelic • …
- 18. ADVANCED • Secrets Management - Security Vaults (Harshicorp, Aqua, Twistlock)… • Persistence Volumes – EBS, AzureDisk, Ceph, GlusterFS, OpenEBS … • Helm – package manager for kubernetes • Service Mesh - Istio • HorizontalPodAutoscaler, StatefulSet, DeamonSet, Ingress
- 19. SUMMARY • Never deploy pod directly – use Deployment or StatefulSet • Use Services for inner cluster communication • Production requirements • Resource restrictions • Health checks • Logging • Alerts and Monitoring
- 20. THANK YOU