Deploy the juicefs helm chart on Oracle Kubernetes Engine (OKE)

Question

Pulumi · Accepted Answer

To deploy the JuiceFS Helm chart on Oracle Kubernetes Engine (OKE), you will primarily need the `oci` and `kubernetes` Pulumi providers. You would first set up OKE with OCI (Oracle Cloud Infrastructure), and then proceed with deploying the Helm chart.

Here's a detailed guide on what each part of the program does:

1. **OCI Kubernetes Cluster Setup**: We'll use the `oci.ContainerEngine.Cluster` resource to set up a Kubernetes cluster in Oracle Cloud Infrastructure. This resource will manage the Kubernetes cluster within your specified compartment and VCN (Virtual Cloud Network) in OCI.

2. **Kubernetes provider**: We utilize the `kubernetes` provider to interact with the Kubernetes cluster created in the first step. The provider relies on the kubeconfig file generated by OCI during cluster creation.

3. **Helm Chart Deployment**: With the cluster in place and the provider configured, we'll deploy JuiceFS using the `kubernetes.helm.v3.Chart` resource. JuiceFS Helm chart deployment will consist of providing the necessary parameters such as chart name, repository, and any configuration overrides if required.

Let's translate this into a Pulumi TypeScript program:

```typescript
import * as pulumi from '@pulumi/pulumi';
import * as oci from '@pulumi/oci';
import * as k8s from '@pulumi/kubernetes';

// Here we're assuming that you've set up the OCI provider credentials
// in your environment or via the Pulumi config.

// Replace these with appropriate values for your specific OCI environment.
const compartmentId = 'ocid1.compartment.oc1..xxxxxx';
const vcnId = 'ocid1.vcn.oc1..xxxxxx';
const kubernetesVersion = 'v1.21.4'; // specify the desired Kubernetes version

// Create an Oracle Kubernetes Engine (OKE) cluster
const cluster = new oci.ContainerEngine.Cluster("juicefsCluster", {
    // provide your compartment OCID
    compartmentId: compartmentId,
    
    // specify the Kubernetes version
    kubernetesVersion: kubernetesVersion,
    
    // specify the VCN OCID where the cluster will live
    vcnId: vcnId,
    
    // other necessary options like node pool configuration, network setup, etc.
});

// Once the cluster is provisioned, we get the kubeconfig to interact with it.
// This step might differ based on how Oracle provides the kubeconfig for OKE.
const kubeconfig = pulumi.all([cluster.id]).apply(([id]) => {
    // Logic to retrieve or construct the kubeconfig for the new cluster
    // This often involves invoking an API or running a command like `oci ce cluster create-kubeconfig`
});

// Create a Kubernetes provider instance using the kubeconfig.
const k8sProvider = new k8s.Provider("okeK8sProvider", {
    kubeconfig: kubeconfig,
});

// Deploy the JuiceFS Helm chart to our OKE cluster using the Helm provider.
const juicefsChart = new k8s.helm.v3.Chart("juicefs", {
    // Replace with the correct chart name and repository
    chart: "juicefs",
    version: "0.7.2", // replace with the specific chart version you need
    fetchOpts: {
        // specify the repo where the JuiceFS Helm chart is located
        repo: "https://juicefs.github.io/charts/",
    },
}, { provider: k8sProvider });

// Export any relevant information such as the cluster's name or the Helm chart status
export const clusterName = cluster.name;
export const juicefsChartStatus = juicefsChart.status;
```

In this program:

- We define three constants at the top: `compartmentId`, `vcnId`, and `kubernetesVersion`. These should be replaced with the appropriate values for your OCI setup.

- We instantiate an OKE cluster using the `oci.ContainerEngine.Cluster` resource. You need to provide the compartment ID, VCN ID, and desired Kubernetes version you want to use.

- To manage resources within the Kubernetes cluster, we use the `k8s.Provider` which needs a kubeconfig. The kubeconfig can be retrieved or constructed after the OKE cluster is ready.

- Finally, we deploy the JuiceFS Helm chart using the `k8s.helm.v3.Chart` resource. The `fetchOpts` property should include the repository where the JuiceFS Helm chart is stored. In this example, we're pointing to the official JuiceFS Helm repository.

- We export `clusterName` and `juicefsChartStatus`, which can be helpful for accessing information about the cluster and the Helm release outside of Pulumi.

**Remember**: Before running this Pulumi program, ensure you have the required OCI credentials configured, either via environment variables or the Pulumi config. Also, the OCI Pulumi provider must be installed and configured appropriately to create resources in Oracle Cloud Infrastructure.