Deploy the mapserver helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

To deploy a MapServer Helm chart on Azure Kubernetes Service (AKS), you'll need to follow these steps:

1. **Create an AKS Cluster:** Provision an Azure Kubernetes Service cluster where your Helm chart will be deployed.
   
2. **Install and Configure Helm on your Local Machine:** Helm is a package manager for Kubernetes that allows you to define, install, and upgrade even the most complex Kubernetes applications. You'll need to have Helm installed on your local machine or wherever you're running Pulumi from.

3. **Add the Helm Chart Repository:** Add the repository containing the MapServer Helm chart so you can access the chart.

4. **Deploy the Helm Chart on AKS:** Using Pulumi, deploy the MapServer Helm chart to your AKS cluster.

Below is a Pulumi TypeScript program that sets up an AKS cluster and deploys a MapServer Helm chart. In this example, we'll use the `azure-native` package to create an AKS cluster and the `kubernetes` package to deploy the Helm chart:

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as azureNative from "@pulumi/azure-native";
import * as k8s from "@pulumi/kubernetes";

// Create an AKS cluster.
const resourceGroup = new azureNative.resources.ResourceGroup("resourceGroup");

const cluster = new azureNative.containerservice.ManagedCluster("aksCluster", {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        count: 1,
        maxPods: 110,
        mode: "System",
        name: "agentpool",
        osDiskSizeGB: 30,
        osType: "Linux",
        vmSize: "Standard_DS2_v2",
    }],
    dnsPrefix: pulumi.getStack(),
    enableRBAC: true,
    kubernetesVersion: "1.19.7",
    linuxProfile: {
        adminUsername: "adminuser",
        ssh: {
            publicKeys: [{
                keyData: "ssh-rsa ...",
            }],
        },
    },
    location: resourceGroup.location,
    resourceGroupName: resourceGroup.name,
    servicePrincipalProfile: {
        clientId: "CLIENT_ID",
        secret: "CLIENT_SECRET",
    },
});

// Expose a KubeConfig for the newly created AKS cluster.
export const kubeConfig = cluster.kubeConfig;

// Create a Kubernetes provider instance that uses the KubeConfig from the AKS cluster.
const provider = new k8s.Provider("k8sProvider", {
    kubeconfig: kubeConfig.apply(kc => kc.rawConfig),
});

// Add the Helm chart repository containing MapServer and then deploy the Helm chart.
const mapserverChart = new k8s.helm.v3.Chart("mapserverChart", {
    chart: "mapserver",
    version: "x.y.z", // Specify the version of the chart you want to deploy
    fetchOpts: {
        repo: "https://chart-repository-url/where-mapserver-chart-is-stored", // Replace with the actual repository URL
    },
}, { provider });

// Export the public IP to access MapServer if available from the chart's default service configuration.
export const mapserverPublicIP = mapserverChart.getResourceProperty("v1/Service", "mapserver-service", "status")
    .apply(status => status.loadBalancer?.ingress[0].ip);
```

In the above program:

- We create an AKS cluster with a single agent node. You can adjust the `vmSize`, `osDiskSizeGB`, and `count` to match your requirements for the MapServer.
- A Kubernetes provider is created using the kubeconfig of the AKS cluster which allows Pulumi to communicate with our AKS cluster.
- We then declare a new `Chart` resource which tells Pulumi to deploy the MapServer Helm chart. You need to replace `x.y.z` with the version of the MapServer Helm chart you wish to deploy and `https://chart-repository-url/where-mapserver-chart-is-stored` with the actual Helm chart repository containing the MapServer chart.
- Finally, if the Helm chart creates a Kubernetes Service of type LoadBalancer for MapServer, we attempt to export the public IP address that can be used to access MapServer externally.

Please remember to replace `CLIENT_ID` and `CLIENT_SECRET` with the actual Azure service principal details you have. Moreover, you should have the public key for SSH access to the nodes (`ssh-rsa ...`) and should adjust the version and repository URL for the MapServer Helm chart according to the actual values.

To execute this program, you will need to have Pulumi installed and configured to access your Azure account, as well as Helm and the `kubectl` command-line tool installed to interact with the cluster. After running `pulumi up`, the resources will be provisioned, and outputs such as the `kubeConfig` and `mapserverPublicIP` will be displayed.