Demystifying microservices inside Azure AKS ITDays Radu Vunvulea 2018
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The main purpose of this session is to put on the table things that we need to be aware of when we decide to run our .NET Core applications inside Azure Kubernetes Services. Microservices is powerful but comes with a new paradigm for how we need to design our applications and write our code. Join this session if you want to find more about it.
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Demystifying microservices inside Azure AKS ITDays Radu Vunvulea 2018
- 1. Demystifying microservices inside Azure AKS @RaduVunvulea Playing with technology until it breaks
- 3. Foundation, core concepts and values
- 4. Agenda • High level overview • Package, Deployment and Lifecycle • Load Balancer • Networking • CI / CD & Automation • Scaling
- 5. Why container orchestration? Scheduling Affinity Health monitoring Failover Scaling Networking Service discovery Coordinated upgrades
- 6. De-factor orchestrator: Kubernetes • Public, Hybrid, Multi-cloud, Private Portable • Pluggable, Modular, Hookable, Composable Extensible • Auto-restart, Auto-scaling, Auto- replacement, Auto-replication Self-healing
- 7. Kubernetes: Empowering us Deploy quick and predictable Scale on the fly Roll out seamlessly Limit hardware usage
- 8. Managed by Azure Azure Kubernetes Service Kubernetes cluster
- 9. Microservice
- 10. Image
- 11. Container
- 13. Docker
- 14. Docker
- 15. Master VMMaster VM Master VM
- 16. Master VMMaster VM Master VM You need to manage each node
- 17. Master VMMaster VM Master VM
- 18. Why to use AKS Easy to use • Fastest path to Kubernetes on Azure • Up and running with 3 simple commands Easy to manage • Automated upgrades and patching • Easily scale the cluster up and down • Self-healing control plane Uses Open APIs • 100% upstream Kubernetes
- 20. Package & Deploy - Draft Code Application code draft init Create container artifacts Detect language Generate artifacts required by Kubernetes draft create Build container image Build the image Deploy it draft up
- 21. Lifecycle - Helm • Manage the application lifecycle using preconfigured resources – charts • Package manager helm init –upgrade helm repo update helm install stable/nginx-ingress helm list
- 22. Helm In-cluster server Interacts with client and Kubernetes API Server Interact with server Sends charts and conf values to Tiller Install / Upgrade / Modify Tiller Helm
- 25. Load Balancer
- 29. Load Balancer Default: Azure Load Balancer • Public IP: 20 • Outside the cluster Option 1: Application Gateway • Scalable • Runs outside the cluster
- 30. Option 2: Load Balancer - nginx
- 31. If you have problems kubectl get pods -n kube-system kubectl exec -it “nginxcontroller” -n kube-system bash cat /etc/nginx/nginx.conf
- 33. Don’t panic when you get… 2018-11-01T09:47:00.6770427Z There were errors in your deployment. Error code: DeploymentFailed. 2018-11-01T09:47:00.6831885Z ##[error]At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-debug for usage details. 2018-11-01T09:47:00.6841477Z ##[error]Details: 2018-11-01T09:47:00.6842318Z ##[error]Conflict: { "error": { "code": "MissingSubscriptionRegistration", "message": "The subscription is not registered to use namespace 'Microsoft.ContainerRegistry'. See https://aka.ms/rps-not-found for how to register subscriptions.",
- 34. Don’t panic when you get… 2018-11-01T09:47:00.6770427Z There were errors in your deployment. Error code: DeploymentFailed. 2018-11-01T09:47:00.6831885Z ##[error]At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-debug for usage details. 2018-11-01T09:47:00.6841477Z ##[error]Details: 2018-11-01T09:47:00.6842318Z ##[error]Conflict: { "error": { "code": "MissingSubscriptionRegistration", "message": "The subscription is not registered to use namespace 'Microsoft.ContainerRegistry'. See https://aka.ms/rps-not-found for how to register subscriptions.",
- 36. Connectivity
- 38. How to connect to Azure Kubernetes Portal? PS> az account set -s f52405d0-ba95-XXXX-XXXXXXXX… PS> $env:path += 'C:Usersradu.vunvulea.azure-kubectl’ PS> az aks install-cli PS> az aks get-credentials --resource-group itcampcluj-rg --name itcampcluj PS> az aks browse --resource-group itcampcluj-rg --name itcampcluj …. 127.0.0.1:8001 ….
- 39. How to connect to Azure Kubernetes Portal? PS> az account set -s f52405d0-ba95-XXXX-XXXXXXXX… PS> $env:path += 'C:Usersradu.vunvulea.azure-kubectl’ PS> az aks install-cli PS> az aks get-credentials --resource-group itcampcluj-rg --name itcampcluj PS> az aks browse --resource-group itcampcluj-rg --name itcampcluj …. 127.0.0.1:8001 rm ~/.kube/config ….
- 40. Monitoring
- 41. Azure Monitoring Cluster Nodes Controller Containers CPU Memory Availability Activity count Restarts
- 44. Networking
- 45. Network – Default / “Basic” Node Pod Pod Node Pod Pod Azure Virtual Network (VNET) Public Internet Azure Load Balancer Expose a Kubernetes service externally or internally Pods can access resources on the public Internet. No control on IP range or subnets
- 46. Network – “ Advance” Node Pod Pod Node Pod Pod Azure Virtual Network (VNET) Public Internet StorageDatabase Subnet Node Pod Pod Bridge AzureCNI • User Defined Routes (UDR) support • Direct connection to Azure Services • Each POD has it’s own IP • Direct communication with other resources from VNET • On-premises access over S2S VPN or Express Router
- 47. CI / CD & Automation
- 48. CI/CD – Azure DevOps
- 50. Azure DevOps Create/Remove AKS Cluster Out of the box AKS integration Automatic recreation Self-hosted agents Service Hooks SDK Release policy
- 51. Scaling
- 52. No.ofpods Manual Scale Pod Pod Pod No. of nodes Nod NodNod
- 53. No.ofpods Horizontal pod autoscaler Pod Pod Pod No. of nodes Nod NodNod Pod Pod Pod Pod
- 54. No.ofpods Cluster autoscaler Pod Pod Pod Cluster autoscaler NodNodNod Pod Pod Pod Pod NodNod
- 55. No.ofpods Pod Pod Pod Cluster autoscaler NodNodNod Pod Pod Pod Pod NodNod Latency until new nodes are available
- 56. No.ofpods AKS extends to Azure Container Instances Pod Pod Pod Cluster autoscaler NodNodNew Pod Pod Pod Pod NodNod Virtual Kubelet configures ‘Virtual nodes’ Azure Container Instances
- 57. Time is up… but ... this is just the beginning of a long journey
- 58. Things to remember Helm Draft Templates nginx Azure Load Balancer Azure DevOps Azure Container Instances Cluster autoscaling Horizontal pod scaler VNET Support Azure Monitoring