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Kubernetes for Developers - All Day DevOps
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Hossam Barakat
November 06, 2019
Programming
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Kubernetes for Developers - All Day DevOps
Hossam Barakat
November 06, 2019
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Transcript
Kubernetes for Developers Hossam Barakat Lead Consultant at Telstra Purple
@hossambarakat_
@hossambarakat_ • What is Kubernetes? • Why Kubernetes? • Kubernetes
Architecture • Deploy Web App with DB on Kubernetes Agenda
@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
@hossambarakat_ The application is deployed to production
@hossambarakat_ Then the application went viral
@hossambarakat_ Containers bring scalability challenges!
@hossambarakat_ Container orchestration platforms to rescue
@hossambarakat_ • Service discovery • Scaling • Health monitoring •
Failover • Networking • Scheduling • Coordinated app upgrades Container Orchestration
@hossambarakat_ Kubernetes
@hossambarakat_ Kubernetes Architecture Master Worker Worker Client Worker Cluster
@hossambarakat_ Kubernetes Architecture Master API Server Scheduler Worker Kubelet Container
Runtime UI (Dashboard) CLI (Kubectl) Other Client(s) Container Container Cluster
@hossambarakat_ ASP .NET App On Kubernetes ASP.NET Application
@hossambarakat_ ASP .NET App On Kubernetes ASP.NET Application ASP.NET Application
ASP.NET Application
@hossambarakat_ Pods
@hossambarakat_ Pods Pod
@hossambarakat_ Pods Scaling Pod Pod
@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
@hossambarakat_ But wait… what happens if the pod dies?
@hossambarakat_ ReplicaSets Pod ReplicaSet Pod
@hossambarakat_
@hossambarakat_ Deployment ReplicaSet Deployment Pod Pod
@hossambarakat_ Deployment Rollout Deployment ReplicaSet V2 Pod Pod ReplicaSet V1
Pod Pod
@hossambarakat_
@hossambarakat_ Connecting to Pods 10.0.0.1 DB Pod A 10.0.0.2 DB
Pod B ASP.NET Pod
@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
@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
@hossambarakat_
@hossambarakat_ Kubernetes in the cloud
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
@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
@hossambarakat_ • Kubernetes Architecture • Deploy application using different workloads
• Kubernetes in the cloud Summary
@hossambarakat_ • https://github.com/hossambarakat/TaskList • Introduction to Kubernetes (edX) • Learn
Kubernetes using Interactive Hands-on Scenarios (Katacoda) • https://kubernetes.io/docs/ Resources
@hossambarakat_ Questions? #2019addo-cloudnative
None
Thanks Hossam Barakat @hossambarakat_