Kubernetes for Developers - All Day DevOps

Transcript

1. Kubernetes for Developers Hossam Barakat Lead Consultant at Telstra Purple

   @hossambarakat_

2. @hossambarakat_ • What is Kubernetes? • Why Kubernetes? • Kubernetes

   Architecture • Deploy Web App with DB on Kubernetes Agenda

3. @hossambarakat_ Containers Hardware Host Operating System Application Application Application Container

   Dependencies Application Host Operating System Hardware Container Engine Container Container Container Container Hardware Host Operating System Virtual Machine Guest OS Application Virtual Machine Guest OS Application Hypervisor

4. @hossambarakat_ The application is deployed to production

5. @hossambarakat_ Then the application went viral

6. @hossambarakat_ Containers bring scalability challenges!

7. @hossambarakat_ Container orchestration platforms to rescue

8. @hossambarakat_ • Service discovery • Scaling • Health monitoring •

   Failover • Networking • Scheduling • Coordinated app upgrades Container Orchestration

9. @hossambarakat_ Kubernetes

10. @hossambarakat_ Kubernetes Architecture Master Worker Worker Client Worker Cluster

11. @hossambarakat_ Kubernetes Architecture Master API Server Scheduler Worker Kubelet Container

    Runtime UI (Dashboard) CLI (Kubectl) Other Client(s) Container Container Cluster

12. @hossambarakat_ ASP .NET App On Kubernetes ASP.NET Application

13. @hossambarakat_ ASP .NET App On Kubernetes ASP.NET Application ASP.NET Application

    ASP.NET Application

14. @hossambarakat_ Pods

15. @hossambarakat_ Pods Pod

16. @hossambarakat_ Pods Scaling Pod Pod

17. @hossambarakat_ Pod kind: Pod apiVersion: v1 metadata: name: tasks-app spec:

    containers: - name: tasks-app image: hossambarakat/tasklist ports: - containerPort: 80 $ Kubectl apply -f pod.yaml

18. @hossambarakat_ But wait… what happens if the pod dies?

19. @hossambarakat_ ReplicaSets Pod ReplicaSet Pod

20. @hossambarakat_

21. @hossambarakat_ Deployment ReplicaSet Deployment Pod Pod

22. @hossambarakat_ Deployment Rollout Deployment ReplicaSet V2 Pod Pod ReplicaSet V1

    Pod Pod

23. @hossambarakat_

24. @hossambarakat_ Connecting to Pods 10.0.0.1 DB Pod A 10.0.0.2 DB

    Pod B ASP.NET Pod

25. @hossambarakat_ Service 10.0.0.2 Pod B 10.0.0.3 Pod C IP: 10.0.0.30

    DNS: myservice Service 10.0.0.1 Pod A

26. @hossambarakat_ Service IP: 10.0.0.30 DNS: tasks-app-svc Service IP: 10.0.0.90 DNS:

    mssql-service Service 10.0.0.1 Pod 10.0.0.1 Pod 10.0.0.1 Pod

27. @hossambarakat_

28. @hossambarakat_ Kubernetes in the cloud

29. Azure AKS $ az aks create -g myResourceGroup -n myCluster

    --generate-ssh-keys $ az aks upgrade --kubernetes-version 1.12.6 --name myCluster --resource-group myResourceGroup $ az aks scale -g myResourceGroup -n myCluster --node-count 6

30. @hossambarakat_ • Scale agent nodes based on pending pods and

    nodes utilization • Scans the cluster periodically to check for pending pods or empty nodes and increases the size if possible AKS Cluster Autoscaler

31. @hossambarakat_ • Kubernetes Architecture • Deploy application using different workloads

    • Kubernetes in the cloud Summary

32. @hossambarakat_ • https://github.com/hossambarakat/TaskList • Introduction to Kubernetes (edX) • Learn

    Kubernetes using Interactive Hands-on Scenarios (Katacoda) • https://kubernetes.io/docs/ Resources

33. @hossambarakat_ Questions? #2019addo-cloudnative

34. None

35. Thanks Hossam Barakat @hossambarakat_