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05 - Infrastructure as Code with Bicep

Use Bicep to define your .NET application infrastructure consistently across environments. This step focuses on repeatable provisioning and safe updates of Azure Container Apps resources.

Infrastructure Context

Service: Container Apps (Consumption) | Network: VNet integrated | VNet: ✅

This tutorial assumes a production-ready Container Apps deployment with a custom VNet, ACR with managed identity pull, and private endpoints for backend services.

flowchart TD
    INET[Internet] -->|HTTPS| CA["Container App\nConsumption\nLinux .NET 8"]

    subgraph VNET["VNet 10.0.0.0/16"]
        subgraph ENV_SUB["Environment Subnet 10.0.0.0/23\nDelegation: Microsoft.App/environments"]
            CAE[Container Apps Environment]
            CA
        end
        subgraph PE_SUB["Private Endpoint Subnet 10.0.2.0/24"]
            PE_ACR[PE: ACR]
            PE_KV[PE: Key Vault]
            PE_ST[PE: Storage]
        end
    end

    PE_ACR --> ACR[Azure Container Registry]
    PE_KV --> KV[Key Vault]
    PE_ST --> ST[Storage Account]

    subgraph DNS[Private DNS Zones]
        DNS_ACR[privatelink.azurecr.io]
        DNS_KV[privatelink.vaultcore.azure.net]
        DNS_ST[privatelink.blob.core.windows.net]
    end

    PE_ACR -.-> DNS_ACR
    PE_KV -.-> DNS_KV
    PE_ST -.-> DNS_ST

    CA -.->|System-Assigned MI| ENTRA[Microsoft Entra ID]
    CAE --> LOG[Log Analytics]
    CA --> AI[Application Insights]

    style CA fill:#107c10,color:#fff
    style VNET fill:#E8F5E9,stroke:#4CAF50
    style DNS fill:#E3F2FD

Infrastructure Lifecycle

graph TD
    WRITE[Write Bicep] --> VAL[Validate]
    VAL --> WHAT[What-If]
    WHAT --> DEPLOY[Deploy]
    DEPLOY --> VERIFY[Verify Outputs]

Prerequisites

Naming Convention

The shared infra/main.bicep template generates unique resource names using uniqueString(resourceGroup().id) (e.g., ca-dotnet-guide-abc123def). Earlier tutorials in this guide use simplified names like ca-dotnet-guide for readability. When deploying via Bicep, always capture actual names from deployment outputs using az deployment group show.

Run validate and what-if before every apply

Treat az deployment group validate and az deployment group what-if as required safety checks to prevent accidental production-impacting infrastructure changes.

Step-by-step

  1. Set standard variables
RG="rg-dotnet-guide"
BASE_NAME="dotnet-guide"
LOCATION="koreacentral"
DEPLOYMENT_NAME="main"
  1. Validate the Bicep template
az deployment group validate \
   --resource-group "$RG" \
   --template-file infra/main.bicep \
   --parameters baseName="$BASE_NAME" location="$LOCATION"
Command Why it is used
az deployment group validate ... Runs the Azure CLI operation required by the documented step.

???+ example "Expected output" 

{
  "status": "Succeeded",
  "error": null
}

  1. Preview changes with what-if
az deployment group what-if \
   --resource-group "$RG" \
   --template-file infra/main.bicep \
   --parameters baseName="$BASE_NAME" location="$LOCATION"
Command Why it is used
az deployment group what-if ... Previews resource changes before deployment.

???+ example "Expected output" 

Resource and property changes are indicated with these symbols:
  + Create
  ~ Modify

The deployment will update the following scope:
Scope: /subscriptions/<subscription-id>/resourceGroups/rg-dotnet-guide

  ~ Microsoft.App/containerApps/<your-app-name> [2024-03-01]
    ~ properties.template.containers[0].image: "<acr-name>.azurecr.io/dotnet-guide:latest"

  1. Deploy infrastructure
az deployment group create \
   --name "$DEPLOYMENT_NAME" \
   --resource-group "$RG" \
   --template-file infra/main.bicep \
   --parameters baseName="$BASE_NAME" location="$LOCATION"
Command Why it is used
az deployment group create ... Deploys the Bicep or ARM template into the target resource group.

???+ example "Expected output" 

{
  "id": "/subscriptions/<subscription-id>/resourceGroups/rg-dotnet-guide/providers/Microsoft.Resources/deployments/main",
  "name": "main",
  "properties": {
    "provisioningState": "Succeeded",
    "outputs": {
      "containerAppName": { "type": "String", "value": "ca-dotnet-guide-<unique-suffix>" },
      "containerAppUrl": { "type": "String", "value": "https://ca-dotnet-guide-<unique-suffix>.<env-suffix>.koreacentral.azurecontainerapps.io" }
    }
  }
}


   !!! note "Unique suffix"
       The `<unique-suffix>` is generated by `uniqueString(resourceGroup().id)` in Bicep to ensure globally unique resource names.
  1. Verify outputs and key resources
az deployment group show \
   --resource-group "$RG" \
   --name "$DEPLOYMENT_NAME" \
   --query properties.outputs
Command Why it is used
az deployment group show ... Reads deployment output and provisioning state for verification.

???+ example "Expected output" 

{
  "containerAppName": {
    "type": "String",
    "value": "ca-dotnet-guide-<unique-suffix>"
  },
  "containerAppEnvName": {
    "type": "String",
    "value": "cae-dotnet-guide-<unique-suffix>"
  },
  "containerRegistryName": {
    "type": "String",
    "value": "crdotnetguide<unique-suffix>"
  },
  "containerAppUrl": {
    "type": "String",
    "value": "https://ca-dotnet-guide-<unique-suffix>.<env-suffix>.koreacentral.azurecontainerapps.io"
  }
}

Example Bicep snippet (.NET App with Health Probes)

resource containerApp 'Microsoft.App/containerApps@2024-03-01' = {
  name: 'ca-${baseName}'
  location: location
  properties: {
    managedEnvironmentId: environment.id
    configuration: {
      ingress: {
        external: true
        targetPort: 8000
      }
    }
    template: {
      containers: [
        {
          name: 'app'
          image: '${acr.properties.loginServer}/${imageName}'
          probes: [
            {
              type: 'Liveness'
              httpGet: {
                path: '/health'
                port: 8000
              }
              initialDelaySeconds: 5
              periodSeconds: 10
            }
            {
              type: 'Readiness'
              httpGet: {
                path: '/health'
                port: 8000
              }
              initialDelaySeconds: 5
              periodSeconds: 10
            }
          ]
        }
      ]
    }
  }
}

Advanced Topics

  • Modular Bicep: Split your templates into reusable modules for networking, storage, and identity.
  • Deployment Scripts: Use Microsoft.Resources/deploymentScripts to perform post-deployment tasks like database migrations.
  • Resource Locking: Apply Microsoft.Authorization/locks to prevent accidental deletion of critical infrastructure.

Avoid out-of-band portal edits

Manual portal changes can create drift from your Bicep templates. Prefer template updates and redeployment so environments remain reproducible and auditable.

CLI Alternative (No Bicep)

Use these commands when you need an imperative deployment path without Bicep.

Step 1: Set variables

RG="rg-dotnet-containerapp"
LOCATION="koreacentral"
APP_NAME="ca-dotnet-demo"
BASE_NAME="dotnet-app"
ACA_ENV_NAME="cae-dotnet-demo"
ACR_NAME="crdotnetdemo"
LOG_NAME="log-dotnet-demo"
Expected output 
Variables exported for resource group, workspace, registry, environment, and app.

Step 2: Create resource group and Log Analytics workspace

az group create --name $RG --location $LOCATION
az monitor log-analytics workspace create --resource-group $RG --workspace-name $LOG_NAME --location $LOCATION
Command Why it is used
az group create ... Creates the isolated resource group used by the example.
Expected output 
{
  "name": "rg-dotnet-containerapp",
  "properties": {
    "provisioningState": "Succeeded"
  }
}
{
  "name": "log-dotnet-demo",
  "customerId": "b2c3d4e5-f6a7-8901-bcde-f23456789012",
  "id": "/subscriptions/<subscription-id>/resourceGroups/rg-dotnet-containerapp/providers/Microsoft.OperationalInsights/workspaces/log-dotnet-demo"
}

Step 3: Create ACR and Container Apps environment

az acr create --resource-group $RG --name $ACR_NAME --sku Basic
LOG_ID=$(az monitor log-analytics workspace show --resource-group $RG --workspace-name $LOG_NAME --query customerId --output tsv)
LOG_KEY=$(az monitor log-analytics workspace get-shared-keys --resource-group $RG --workspace-name $LOG_NAME --query primarySharedKey --output tsv)
az containerapp env create --resource-group $RG --name $ACA_ENV_NAME --location $LOCATION --logs-workspace-id $LOG_ID --logs-workspace-key $LOG_KEY
Command Why it is used
az acr create --resource-group ... Creates Azure Container Registry for container image storage.
Expected output 
{
  "name": "crdotnetdemo",
  "loginServer": "crdotnetdemo.azurecr.io",
  "provisioningState": "Succeeded"
}
{
  "name": "cae-dotnet-demo",
  "id": "/subscriptions/<subscription-id>/resourceGroups/rg-dotnet-containerapp/providers/Microsoft.App/managedEnvironments/cae-dotnet-demo",
  "provisioningState": "Succeeded"
}

Step 4: Create Container App with environment variables

az containerapp create --resource-group $RG --name $APP_NAME --environment $ACA_ENV_NAME --image $ACR_NAME.azurecr.io/$BASE_NAME:v1 --target-port 8000 --ingress external --env-vars ASPNETCORE_ENVIRONMENT=Production --query "properties.configuration.ingress.fqdn"
Command Why it is used
az containerapp create --resource-group ... Creates the Container App with the documented image, ingress, scale, and environment settings.
Expected output 
"<container-app-fqdn>"

Step 5: Validate configuration

az containerapp show --resource-group $RG --name $APP_NAME --query "{fqdn:properties.configuration.ingress.fqdn,targetPort:properties.configuration.ingress.targetPort,environmentVariables:properties.template.containers[0].env}"
Command Why it is used
az containerapp show --resource-group ... Reads the Container App configuration so the documented setting can be verified.
Expected output 
{
  "environmentVariables": [
    {
      "name": "ASPNETCORE_ENVIRONMENT",
      "value": "Production"
    }
  ],
  "fqdn": "<container-app-fqdn>",
  "targetPort": 8000
}

Verify resource group in Azure Portal

Subscription|Visual Studio Enterprise Subscription|Subscription ID|00000000-0000-0000-0000-000000000000|Location|Korea Central|Showing|1 - 12 of 12

[Observed] Microsoft Azure (Preview). Report a bug. Search resources, services, and docs (G+/). Copilot. Home. rg-aca-basics-d38538. Resource group. Help me generate Terraform for this resource group configuration.. How to manage these changes more efficiently with deployment tools?. Generate Bicep code to duplicate this resource group.. Create. Manage view. Delete resource group. Refresh. Export to CSV. Open query. Assign tags. Move. Delete. Export template. Open in mobile. Add to service group. Group by none. Essentials. Subscription (move). Visual Studio Enterprise Subscription. Subscription ID. 00000000-0000-0000-0000-000000000000. Deployments. No deployments. Location. Korea Central. Tags (edit). Add tags. View Cost. JSON View. Resources. Recommendations. Filter for any field.... Type equals all. Location equals all. Add filter. Name. Type. acrbasicsd38538. Container registry. ca-dotnet-d38538. Container App. ca-java-d38538. ca-nodejs-d38538. ca-sample-d38538. cae-basics-d38538. Container Apps Environment. cj-event-d38538. Container App Job. cj-sample-d38538. cj-scheduled-d38538. law-basics-d38538. Log Analytics workspace. stacad38538. Storage account. stacad38538-00000000-0000-0000-0000-000000000000. Event Grid System Topic. Overview. Activity log. Access control (IAM). Tags. Resource visualizer. Events. Settings. Cost Management. Monitoring. Automation. Help. Showing 1 - 12 of 12.

[Inferred] The Container App row ca-dotnet-d38538 appears consistent with the ASP.NET Core Container App resource provisioned by az containerapp create in Step 4: Create Container App with environment variables. The Container Apps Environment row cae-basics-d38538 appears consistent with the environment resource provisioned in Step 3: Create ACR and Container Apps environment. The Container registry row acrbasicsd38538 appears consistent with the ACR resource provisioned by az acr create in Step 3: Create ACR and Container Apps environment. The Log Analytics workspace row law-basics-d38538 appears consistent with the workspace resource provisioned by az monitor log-analytics workspace create in Step 2: Create resource group and Log Analytics workspace.

[Not Proven] Additional template body, deployment command, and deployment history detail are not visible on this view.

See Also

Sources