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
35. Thanks Hossam Barakat @hossambarakat_