Azure Kubernetes Service Quickstart

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Azure Kubernetes Service Quickstart Joost van Uitert Software Engineer DEVCAMPNOORD 04-04-2024

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Structure

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About me

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What is Kubernetes? • Open-source platform for managing containerized workloads and services. • Widely used, so a lot of support and can be used on many platforms, including Azure

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What is Kubernetes? • Kubernetes means something like helmsman or captain in Greek. Some Kubernetes components continue the nautical theme.

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Alternatives Azure Container Instances + Easier / simpler + No overhead containers + Serverless + Linux and Windows - Limited scale - Limited customizability - Limited integrations Azure Container Apps + Easier / simpler + No overhead containers + Serverless + Price flexibility - Only Linux OS - Limited scale - Limited customizability - Limited integrations

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When should we use AKS? • Scale is big enough • Enough Traffic/Use • Expertise of the team • Needs to be highly available

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How does Kubernetes work?

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Cluster

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Node

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resource aks 'Microsoft.ContainerService/managedClusters@2022-05-02-preview' = { properties: { dnsPrefix: dnsPrefix agentPoolProfiles: [ { name: 'agentpool' osDiskSizeGB: osDiskSizeGB count: 3 vmSize: 'Standard_B4ms' osType: 'Linux' mode: 'System' enableNodePublicIP: false } { name: 'apps' count: 2 vmSize: 'Standard_A2_v2’ … type: 'VirtualMachineScaleSets' maxCount: 2 minCount: 0 enableAutoScaling: true mode: 'User' osType: 'Linux' } ] } sku: { name: 'Basic' tier: 'Free' } }

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Namespace

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Namespace apiVersion: v1 kind: Namespace metadata: name: aksdemoapp ---

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Pod • Smallest deployable unit • (Group of) container(s)

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Container • “Ready to run software package”

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Container FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build-env WORKDIR /App # Copy everything COPY . ./ # Restore as distinct layers RUN dotnet restore # Build and publish a release RUN dotnet publish -c Release -o out # Build runtime image FROM mcr.microsoft.com/dotnet/aspnet:8.0 WORKDIR /App COPY --from=build-env /App/out . ENTRYPOINT ["dotnet", "DotNet.Docker.dll"]

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Cluster + nodes + namespaces + pods + containers FE BE FE FE BE

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What are the benefits? • Ability to scale • Automatic recovery (restart) • Geen deployment downtime

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How do we operate all of this?

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Kubectl en k9s

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Demo: cluster bicep deployment

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Demo: let’s deploy an app!

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Demo: let’s deploy an api!

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What have we learned? • Creating Application Images • Pushing Images to Repository • Deployment yml

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What do we have now?

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Is it that easy? No • Roles / Role bindings • Service accounts • Configmaps • Secrets • Persistent volume (claims) • Ingresses • Services • Resource limits • Cluster roles / Cluster role bindings • Daemonsets • Cronjobs / Jobs • Init containers • Annotations • Labels • Ingress controllers • GatewayAPI’s • DNS • Ephemeral volumes • Taints and tolerations • Certificate management • Proxies • Addons • Custom resource definitions • Garbage collection

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Demo: let’s scale an api!

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What have we learned? • Scaling in Kubernetes is easy!

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Demo: let’s break an api!

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What have we learned? • Liveness en readiness probe • Rollout van applicatie is slim var builder = WebApplication.CreateBuilder(args); builder.Services.AddHealthChecks(); var app = builder.Build(); app.MapHealthChecks("/healthz"); app.Run();

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How does (managed) Azure Kubernetes Service work? • Works with • Identities / AD • Cost management • Migratie services • Networking • Can of course connect to • Storage • Key Vault • Application Gateway • Azure Container Registry • Kubernetes takes care of the containers • You are responsible for the nodes / vm's