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Try-This exercise - Deploy an application to Azure Kubernetes Service cluster

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In this exercise, you walk through the process of creating and updating a deployment in an Azure Kubernetes Service cluster. You use the cluster you provisioned in the first exercise of this module.

Note

To complete this exercise, you need an Azure Subscription.

Prepare for creating a deployment to an Azure Kubernetes Service cluster

In this task, you prepare for a deployment to an AKS cluster by creating a namespace using Azure Cloud Shell.

1. From the Azure portal, open a Bash session in the Azure Cloud Shell and run the following commands.

   kubectl create namespace demo-deployment
   kubectl get namespaces
   

2. Run the following command to add a node to the AKS cluster.

   az aks show --resource-group $AKSRG --name $AKSNAME --query agentPoolProfiles
   az aks scale --resource-group $AKSRG --name $AKSNAME --node-count 2 --nodepool-name nodepool1
   

   Note

   Wait until the extra node is fully provisioned before you proceed to the next task.
   

Create a deployment

In this task, you create a deployment in the target AKS cluster.

1. In the Azure portal, in the Bash session of Azure Cloud Shell, use the built-in editor to create a file named nginx-deployment.yaml and copy to the following YAML manifest:

   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: nginx-deployment
   spec:
     replicas: 3
     selector:
       matchLabels:
         app: nginx
     template:
       metadata:
         labels:
           app: nginx
       spec:
         containers:
         - name: nginx
           image: mcr.microsoft.com/oss/nginx/nginx:1.15.2-alpine
           ports:
           - containerPort: 80
           resources:
             requests:
               cpu: 250m
               memory: 64Mi
             limits:
               cpu: 500m
               memory: 256Mi
   

2. Save the changes to the file and close it to return to the Bash prompt.

3. To create the deployment, from the Bash session in the Azure Cloud Shell, run the following command:

   kubectl apply -f nginx-deployment.yaml --namespace demo-deployment
   

4. To validate the deployment, enumerate deployments, pods, and replica sets by running the following commands:

   kubectl get deployments --namespace demo-deployment
   kubectl get pods --namespace demo-deployment
   kubectl get rs --namespace demo-deployment
   

Update the deployment

In this task, you update the deployment by replacing the image used by its pods.

1. To replace the image used by our deployment, from the Bash session in the Azure Cloud Shell, run the following command:

   kubectl set image deployment/nginx-deployment nginx=nginx:1.16.1 --namespace demo-deployment
   

2. To validate the deployment, enumerate deployments, pods, and replica sets by running the following commands:

   kubectl get deployments --namespace demo-deployment
   kubectl get pods --namespace demo-deployment
   kubectl get rs --namespace demo-deployment
   

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