Kubernetes for .NET Developers - NDC Sydney 2018

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Kubernetes for .NET Developers Hossam Barakat Senior Consultant at Readify @hossambarakat_ | www.hossambarakat.net

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@hossambarakat_ • What is Kubernetes? • Why Kubernetes? • Kubernetes Architecture • Kubernetes Building Blocks Agenda

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@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

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@hossambarakat_ What is Docker?

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@hossambarakat_ The application is deployed to production

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@hossambarakat_ Then the application went viral

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@hossambarakat_ Containers bring scalability challenges!

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@hossambarakat_ Container orchestration platforms to rescue

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@hossambarakat_ • Service discovery • Scaling • Health monitoring • Failover • Networking • Scheduling • Coordinated app upgrades Container Orchestration

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@hossambarakat_ Kubernetes

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@hossambarakat_ • Self-healing • Horizontal scaling • Service discovery and load balancing • Automated rollouts and rollbacks • Secret and configuration management • Storage orchestration • Automatic binpacking • Batch execution Why Kubernetes?

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@hossambarakat_ Kubernetes Architecture Master Worker Worker Client Worker Cluster

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@hossambarakat_ Kubernetes Architecture Master API Server Controller Manager Scheduler Worker Kubelet Container Runtime UI (Dashboard) CLI (Kubectl) Other Client(s) Container Container Cluster

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@hossambarakat_ • Localhost installation (Minikube, Docker For Desktop) • On-Premise Installation (VMs, Bare Metal) • Cloud (Google, Azure, AWS,…) Installing Kubernetes

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

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

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@hossambarakat_ Pods

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@hossambarakat_ Pods Pod

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@hossambarakat_ Pods Scaling Pod Pod

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@hossambarakat_

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

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@hossambarakat_ ReplicaSets Pod ReplicaSet Pod

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@hossambarakat_ ReplicaSets Master Worker 1 Worker 2 Pod 1 Pod 2 Worker 3 Pod 2

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@hossambarakat_ Labels Pod

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@hossambarakat_

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@hossambarakat_ Deployment ReplicaSet Deployment Pod Pod

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

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@hossambarakat_

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@hossambarakat_ Connecting to Pods 10.0.0.1 DB Pod A 10.0.0.2 DB Pod B ASP.NET Pod

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@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

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@hossambarakat_ Service 10.0.0.1 DB Pod A ASP.NET Pod IP: 10.0.0.30 DNS: myservice Service

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@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

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@hossambarakat_

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@hossambarakat_ Persistent Volume

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@hossambarakat_ Persistent Volume

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@hossambarakat_ Persistent Volume

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@hossambarakat_

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@hossambarakat_ Kubernetes in the cloud

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Azure AKS $ az aks create -g myResourceGroup -n myCluster --generate-ssh-keys $ az aks get-credentials -g myResourceGroup -n myCluster $ kubectl get nodes $ az aks scale -g myResourceGroup -n myCluster --node-count 6

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@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

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@hossambarakat_ • Kubernetes Architecture • Deploy application using different workloads • Kubernetes in the cloud Summary

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@hossambarakat_ • https://www.hossambarakat.net • https://github.com/hossambarakat/TaskList • Introduction to Kubernetes (edX) • Learn Kubernetes using Interactive Hands-on Scenarios (Katacoda) • https://kubernetes.io/docs/ Resources