Using Kubernetes Networking.gke.io With Postgresql.cnpg.io

Introduction

In this guide, we will demonstrate how to use Pulumi to deploy a PostgreSQL cluster using the postgresql.cnpg.io operator on Google Kubernetes Engine (GKE) and configure networking using networking.gke.io. This setup will involve creating a GKE cluster, deploying the PostgreSQL operator, and setting up the necessary network policies.

Step-by-Step Explanation

Step 1: Create a GKE Cluster

First, we need to create a GKE cluster. This involves setting up the cluster with the necessary node pools and configurations.

Step 2: Deploy the PostgreSQL Operator

Next, we will deploy the postgresql.cnpg.io operator to manage our PostgreSQL clusters. This operator simplifies the deployment and management of PostgreSQL clusters on Kubernetes.

Step 3: Configure Networking with networking.gke.io

Finally, we will configure the networking policies using networking.gke.io to ensure secure and efficient communication within the GKE cluster.

Conclusion

By following these steps, you will have a fully functional PostgreSQL cluster managed by the postgresql.cnpg.io operator on a GKE cluster with networking configured using networking.gke.io. This setup ensures that your PostgreSQL cluster is both scalable and secure.

Full Code Example

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";
import * as k8s from "@pulumi/kubernetes";

// Create a GKE cluster
const cluster = new gcp.container.Cluster("gke-cluster", {
    initialNodeCount: 3,
    minMasterVersion: "latest",
    nodeConfig: {
        machineType: "n1-standard-1",
        oauthScopes: [
            "https://www.googleapis.com/auth/cloud-platform",
        ],
    },
});

// Export the Kubeconfig
export const kubeconfig = pulumi.all([cluster.name, cluster.endpoint, cluster.masterAuth]).apply(([name, endpoint, auth]) => {
    const context = \`\${gcp.config.project}_\${gcp.config.zone}_\${name}\`;
    return \`apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: \${auth.clusterCaCertificate}
    server: https://\${endpoint}
  name: \${context}
contexts:
- context:
    cluster: \${context}
    user: \${context}
  name: \${context}
current-context: \${context}
kind: Config
preferences: {}
users:
- name: \${context}
  user:
    auth-provider:
      config:
        cmd-args: config config-helper --format=json
        cmd-path: gcloud
        expiry-key: '{.credential.token_expiry}'
        token-key: '{.credential.access_token}'
      name: gcp
\`;
});

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

// Deploy the PostgreSQL operator
const pgOperator = new k8s.yaml.ConfigFile("pg-operator", {
    file: "https://raw.githubusercontent.com/cloudnative-pg/cloudnative-pg/main/releases/cnpg-1.15.0.yaml",
}, { provider: k8sProvider });

// Apply network policies
const networkPolicy = new k8s.networking.v1.NetworkPolicy("allow-postgres", {
    metadata: {
        name: "allow-postgres",
        namespace: "default",
    },
    spec: {
        podSelector: {
            matchLabels: {
                app: "postgres",
            },
        },
        policyTypes: ["Ingress", "Egress"],
        ingress: [{
            from: [{
                podSelector: {
                    matchLabels: {
                        app: "frontend",
                    },
                },
            }],
        }],
        egress: [{
            to: [{
                podSelector: {
                    matchLabels: {
                        app: "backend",
                    },
                },
            }],
        }],
    },
}, { provider: k8sProvider });