Using kubernetes hydra.ory.sh with databases.spotahome.com

Question

Pulumi · Accepted Answer

Creating a Kubernetes-based OAuth2 and OpenID Connect provider using ORY Hydra, along with a corresponding PostgreSQL database, can be achieved with Pulumi. ORY Hydra is an open-source system for federated identity and access management, capable of functioning as an OAuth2 authorization server with OpenID Connect. To support Hydra, you'll need a PostgreSQL database, which `databases.spotahome.com` provides as an operator that allows running PostgreSQL inside a Kubernetes cluster.

The high-level steps to deploy a Hydra instance using `databases.spotahome.com` for PostgreSQL in Kubernetes would look something like this:

1. Deploy a PostgresSQL instance using the `databases.spotahome.com` operator.
2. Deploy ORY Hydra which is configured to use the above PostgreSQL instance.
3. Create Kubernetes Services to expose Hydra to the outside world if necessary.

Let's compose a Pulumi TypeScript program to accomplish this. Please note that the following code assumes you have set up the necessary environment to deploy to a Kubernetes cluster, and also assumes you have the `databases.spotahome.com` operator installed in the cluster.

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

// Specify the namespace where you want to deploy your resources.
const namespace = new k8s.core.v1.Namespace("hydra-namespace", {
    metadata: { name: "hydra" },
});

// Deploy the PostgreSQL database using the Spotahome PostgreSQL operator.
const postgres = new k8s.apiextensions.CustomResource("hydra-postgres", {
    apiVersion: "databases.spotahome.com/v1",
    kind: "Postgres",
    metadata: {
        namespace: namespace.metadata.name,
        name: "hydra-postgres",
    },
    spec: {
        // Customize your PostgreSQL deployment based on your needs.
        // This example uses a single instance for simplicity.
        size: 1,
        version: "10",
        // `volume` property specifications would go here to configure storage.
    },
});

// Deploy ORY Hydra using a Kubernetes Deployment.
const hydraDeployment = new k8s.apps.v1.Deployment("hydra-deployment", {
    metadata: {
        namespace: namespace.metadata.name,
    },
    spec: {
        selector: { matchLabels: { app: "hydra" } },
        replicas: 1,
        template: {
            metadata: { labels: { app: "hydra" } },
            spec: {
                containers: [{
                    name: "hydra",
                    image: "oryd/hydra:v1.10.6", // Use the desired version of Hydra
                    ports: [{ containerPort: 4444 }], // Hydra's default port
                    env: [
                        // Configure ORY Hydra to use the deployed PostgreSQL instance
                        {
                            name: "DSN",
                            value: "postgresql://hydra:<password>@hydra-postgres.hydra:5432/hydra?sslmode=disable",
                        },
                        {
                            name: "URLS_SELF_ISSUER",
                            value: "http://hydra-service.hydra:4444/",
                        },
                        // Other necessary environment variables would go here.
                    ],
                }],
            },
        },
    },
}, { dependsOn: [postgres] }); // Make sure the PostgreSQL is ready before Hydra starts.

// Expose the Hydra service with a Kubernetes Service.
const hydraService = new k8s.core.v1.Service("hydra-service", {
    metadata: {
        namespace: namespace.metadata.name,
    },
    spec: {
        type: "LoadBalancer",
        selector: hydraDeployment.spec.template.metadata.labels,
        ports: [{ port: 4444 }],
    },
});

// Export the Hydra service endpoint to easily access it
export const hydraEndpoint = hydraService.status.loadBalancer.ingress[0].ip;
```

Here is a step-by-step explanation of what this Pulumi program does:

1. A Kubernetes Namespace is created to house all the resources needed for ORY Hydra and the Postgres database. Namespaces help organize resources within a Kubernetes cluster.

2. A PostgreSQL database is deployed using a CustomResource defined by the Spotahome PostgreSQL operator, which facilitates managing PostgreSQL instances within Kubernetes. Here, as an example, a PostgreSQL version 10 database with a size of 1 instance is deployed.

3. An ORY Hydra Deployment is created, specifying the Hydra image and exposing the necessary port (4444). The PostgreSQL database created previously is used as the backend storage for Hydra.

4. Environment variables such as `DSN` and `URLS_SELF_ISSUER` are set for the Hydra container, providing Hydra with the necessary information to communicate with the database and define its own OAuth2 issuer URL.

5. A Kubernetes Service of type `LoadBalancer` is created to expose the Hydra Deployment to the public internet. This allows external clients to interact with the Hydra service.

6. Finally, the load balancer IP address is exported so it can be easily accessed by users or client applications interfacing with the Hydra service.

To deploy this, ensure that your Pulumi CLI is set up with access to a Kubernetes cluster and you have the `databases.spotahome.com` operator installed. Then, save this code in a file named `index.ts`, and run `pulumi up` to deploy your OAuth2 and OpenID Connect provider powered by ORY Hydra with a PostgreSQL backend in your Kubernetes cluster.