apps-on-azure

Working with AKS and ACR

Using AKS

az login

az account set --subscription 79080195-8aac-4282-8f0d-5910cb4209c0

az aks get-credentials --resource-group RG-SB-LAB-01 --name akssb01

Only if you’re using Docker Desktop - Set kubernetes context

 kubectl config use-context docker-desktop

Pull and build a sample image:

• Sample .NET Core Web App image:

  docker run -it --rm -p 8000:80 --name aspnetcore_sample mcr.microsoft.com/dotnet/samples:aspnetapp
  

Retag and push to docker hub:

For Azure ACR:
az acr login -n acrlab01
Username: <username>
Password: <password>

docker images
docker tag <source image> acrlab01.azurecr.io/<target image>:<tag>
docker push acrlab01.azurecr.io/<target image>:<tag>

K8s Management Techniques

• https://kubernetes.io/docs/concepts/overview/working-with-objects/object-management/

Imperative Deployment

Deploy the app:

kubectl create deployment <your-name>01 --image=<username>/<target image>:<tag> --replicas=2

kubectl get deployments

kubectl describe deployment <your-deployment-name>

kubectl expose deployment < your-deployment-name> --type=LoadBalancer --port=80 --target-port=80 #map service port 80 to container port 80

kubectl scale deployment < your-deployment-name> --replicas=3

Update the app:

Retag and push v2 of the image to docker hub

kubectl set image deployment/<your-deployment-name> <container-name>=<username>/<target>:v2

Verify the upgrade

Kubectl describe deployment <deployment-name>

Kubernetes rollouts and rollbacks

Get the revision history of your deployment

kubectl rollout history deployment/<deployment-name>

Rollback your deployment to the previoud version

kubectl rollout undo deployment/<deployment-name>

Rollback your deployment to a specific version

kubectl rollout undo deployment/<deployment-name> --to-revision 1

Spin up Pods and Deployments using declarative method

• Add deployment.yaml – Generate the YAML file using K8s extention in VS code
• Add service.yaml – Generate the YAML file using K8s extention in VS code
• Apply the above desired state:

  kubectl apply -f deployment.yaml
  kubectl apply -f service.yaml