Isolating network resources using Azure Container App Environment VNET integration

Question

Pulumi · Accepted Answer

To isolate network resources in Azure when using Container Apps, you'll want to leverage the Container App Environment VNET integration feature. This allows you to run containerized applications within an isolated network space that is part of your virtual network (VNet). You achieve this isolation by integrating the Container App Environment with your VNet.

In the following Pulumi program, we will create an Azure Container App Environment and integrate it with a VNet for isolation. We'll assume that you already have an existing resource group and a VNet to which you want to attach your Container App Environment. You will need to provide the appropriate Azure Resource Manager ID for the subnet you intend to use with your Container App Environment.

Here is an explanation of the key resources being created and managed in this Pulumi program:
- `azure-native:network:VirtualNetwork`: This represents the VNet where your application will be isolated.
- `azure-native:network:Subnet`: A subnet within the VNet specifically dedicated to the Container App Environment.
- `azure-native:containerapp:Environment`: The Container App Environment resource itself, which is where your containerized applications will run. We will associate it with the subnet you've defined.

Now let's get to the code.

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as azure from "@pulumi/azure";
import * as azure_native from "@pulumi/azure-native";

// Assume resourceGroupName and vnetName are obtained from configuration or existing resources.
const resourceGroupName = "your-resource-group-name";
const vnetName = "your-vnet-name";
const subnetName = "your-subnet-name";

// Fetch an existing resource group
const resourceGroup = azure_native.resources.getResourceGroup({
    resourceGroupName: resourceGroupName,
});

// Fetch an existing virtual network
const virtualNetwork = azure_native.network.getVirtualNetwork({
    resourceGroupName: resourceGroupName,
    virtualNetworkName: vnetName,
});

// Fetch an existing subnet
const subnet = azure_native.network.getSubnet({
    resourceGroupName: resourceGroupName,
    subnetName: subnetName,
    virtualNetworkName: vnetName,
});

// Create the Container App Environment integrated with your existing VNet subnet
const containerAppEnvironment = new azure_native.containerapp.Environment("myContainerAppEnvironment", {
    resourceGroupName: resourceGroupName,
    location: resourceGroup.then(rg => rg.location), // Use the resource group's location
    infrastructureSubnetId: subnet.then(sub => sub.id), // Reference the subnet's id
});

// Export the resulting Container App Environment ID
export const containerAppEnvironmentId = containerAppEnvironment.id;
```

By completing the steps above, you would have created a private, isolated space for your containerized applications within the context of your existing Azure network infrastructure. Any applications deployed to this environment would be restricted to network access within the confines of the specified VNet and subnet, thus providing a degree of isolation and security.

Remember, to deploy and run Pulumi programs, you need to have the Pulumi CLI installed and Azure credentials configured. Once set up, you can initialize a new Pulumi project, copy the TypeScript program into `index.ts`, and run `pulumi up` to deploy it to Azure.