Deploy the trilium helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the Trilium Helm chart on Linode Kubernetes Engine (LKE), we will write a Pulumi program using TypeScript. This program will perform the following steps:

1. Set up a new Kubernetes cluster in Linode using the Linode Kubernetes Engine (LKE).
2. Install and configure the Helm chart for the Trilium application on the newly created Kubernetes cluster.

First, we need to have Pulumi installed and setup to communicate with Linode. Make sure you have the necessary Linode API token and Pulumi is configured to use it.

We will use the `linode` and `kubernetes` packages from Pulumi. The `linode` provider will allow us to provision an LKE cluster, and the `kubernetes` package lets us apply Helm charts to our Kubernetes cluster.

Here's a step-by-step TypeScript program that accomplishes the deployment:

```typescript
import * as linode from "@pulumi/linode";
import * as k8s from "@pulumi/kubernetes";

// Step 1: Create a new LKE cluster
const cluster = new linode.LkeCluster("my-cluster", {
    label: "my-cluster",
    region: "us-central", // specify the region you prefer
    k8sVersion: "1.20",   // specify the Kubernetes version
    tags: ["my-linode-cluster"],
    nodePools: [{
        type: "g6-standard-2", // specify the type of node
        count: 3,              // specify the number of nodes
    }],
});

// Step 2: Create a Kubernetes Provider pointing to the LKE cluster
const kubeconfig = cluster.kubeconfig.apply(JSON.stringify);
const provider = new k8s.Provider("my-k8s-provider", {
    kubeconfig: kubeconfig,
});

// Step 3: Install the Trilium Helm chart using the Helm provider
const triliumChart = new k8s.helm.v3.Chart("trilium", {
    chart: "trilium",          // The name of the chart
    version: "0.1.0",          // Specify the chart version, if necessary
    namespace: "default",      // Target namespace for the deployment
    fetchOpts: {
        repo: "https://your-helm-chart-repository", // The Helm chart repository URL
    },
    // Values for the Helm chart can be set here if necessary,
    // e.g., values: { "service": { "type": "LoadBalancer" } },
}, { provider: provider });

// Step 4: Export the cluster details and application endpoint if needed
export const clusterName = cluster.label;
export const kubeconfigOutput = cluster.kubeconfig;
export const triliumEndpoint = triliumChart.getResourceProperty("v1/Service", "trilium", "status");
```

Let's break down what each step in this program is doing:

- **Create a new LKE cluster**: This block sets up a new Kubernetes cluster on Linode's infrastructure. Here, you can further customize the region, Kubernetes version, and the node type needed for your use case.
  
- **Create a Kubernetes Provider**: This provider instance is configured to interact with our LKE based on the generated kubeconfig.

- **Install the Trilium Helm chart**: In this step, we are deploying the Trilium application using its Helm chart. If the Trilium chart requires specific values to be set, you can specify them in the `values` property of the `helm.v3.Chart` resource.

- **Export cluster details**: These exported variables can be used to retrieve important information about the cluster and application, such as the cluster name and the Trilium service endpoint, after the Pulumi program runs.

Additionally, you will need to replace some placeholder values:
- The Kubernetes version (`k8sVersion`) may need to be set to the version supported by LKE you wish to use.
- The node pool type and count (`type` and `count`, respectively) can be modified based on the compute requirements for your Trilium instance.
- The `repo` inside `fetchOpts` needs to be replaced with the actual Helm chart repository URL containing the Trilium chart.
- The `version` inside the `Chart` resource must match the version of Trilium Helm chart that you wish to deploy.

Make sure you have the correct repository and chart name for Trilium, and update the `repo` URL accordingly (as Trilium may not have an official Helm chart or is not hosted in Helm's common repository).

To run this, you would typically perform the following commands:
1. Save the code to a file named `index.ts`.
2. Initialize a new Pulumi project with `pulumi new`.
3. Install dependencies with `npm install`.
4. Run `pulumi up` to create and deploy the resources.

Please note that actual Helm chart versions or available types of node pools can vary, so you should adjust these values based on the current offerings by your cloud provider and the Helm chart repository.