dotnet-podcasts/docs/demos/azurecontainerapps/Readme.md

Azure Container Apps

This folder contains additional scripts needed for testing the Azure Container Apps scenario.

Demo steps:

1. Get the HTTP API application details:

   az containerapp show -g "$RESOURCE_GROUP_NAME" -n podcastapi
   

2. Look for the application's address in the fqdn field in the ingress config section:

   "configuration": {
       "ingress": {
       "external": true,
       "fqdn": "<FQDN>",
       "targetPort": 80,
       "transport": "auto"
       },
   

3. Browse the HTTP API to confirm It works.

   https://<FQDN>
   

4. Open a PowerShell terminal and watch Container Apps:

• podcastingestionca: Worker service that scale based on queue messages. When the queue is empty the container app should have 1 instances.

  scale: {
      maxReplicas: 5
      minReplicas: 1
      rules: [
        {
          name: 'queue-scaling-rule'
          azureQueue: {
            queueName: 'feed-queue'
            queueLength: 20
            auth: [
              {
                secretRef: 'feedqueue'
                triggerParameter: 'connection'
              }
            ]
          }
        }
      ]
    }
  

• podcastapica: HTTP API that scale based on concurrent HTTP requests. When there are no incoming requests the container app should have 0 instances.

  scale: {
     minReplicas: 0
     maxReplicas: 5
     rules: [
       {
         name: 'httpscalingrule'
         http: {
           metadata: {
             concurrentRequests: '20'
           }
         }
       }
     ]
   }
  

  4.1 Run this commands to watch container apps scaling out.

  while (1) { 
      $output = az containerapp revision list -n podcastapica -g dotnetconf2021-netpodcast --query "[?active].{Name:name, CreatedTime:createdTime, Active:active, Replicas:replicas}" -o table --only-show-errors
      clear;
      echo $output;
      sleep 2;
  }
  

  while (1) { 
      $output = az containerapp revision list -n podcastingestionca -g dotnetconf2021-netpodcast --query "[?active].{Name:name, CreatedTime:createdTime, Active:active, Replicas:replicas}" -o table --only-show-errors
      clear;
      echo $output;
      sleep 2;
  }
  

      while (1) { 
      $output = ./MessageCount.ps1 -storageAccount <storageAccountName> -accessKey <accessKey>
      clear;
      echo $output;
      sleep 1;
  }
  

  

5. Simulate some load sending POST requests to the HTTP API. You should see new messages appearing in the Azure Storage Queue. (feed-queue).

   ./Simulate-Feed-Requests.ps1 -baseUrl https://<FQDN>/
   

   

6. Observe how the HTTP API and the worker scale out.