Using Kubernetes Acid.zalan.do With Ingress

In this solution, we will use Pulumi to deploy a Kubernetes cluster with the Acid Zalando PostgreSQL operator and configure an Ingress resource to manage external access to the PostgreSQL service. The key services involved in this solution are Kubernetes, Acid Zalando PostgreSQL operator, and Kubernetes Ingress.

Introduction

We will deploy a Kubernetes cluster and use the Acid Zalando PostgreSQL operator to manage PostgreSQL databases within the cluster. Additionally, we will configure an Ingress resource to handle external access to the PostgreSQL service. This solution leverages Pulumi to define and manage the infrastructure as code, ensuring a repeatable and consistent deployment process.

Step-by-Step Explanation

Step 1: Set up Pulumi and Kubernetes Provider

We will start by setting up Pulumi and configuring the Kubernetes provider to interact with our Kubernetes cluster.

Step 2: Deploy Acid Zalando PostgreSQL Operator

Next, we will deploy the Acid Zalando PostgreSQL operator, which will manage PostgreSQL databases within the Kubernetes cluster.

Step 3: Create PostgreSQL Database Cluster

We will create a PostgreSQL database cluster using the Acid Zalando operator.

Step 4: Configure Ingress Resource

Finally, we will configure an Ingress resource to manage external access to the PostgreSQL service, allowing clients to connect to the database from outside the Kubernetes cluster.

Key Points

• Pulumi allows us to define and manage infrastructure as code, ensuring repeatable and consistent deployments.
• The Acid Zalando PostgreSQL operator simplifies the management of PostgreSQL databases within a Kubernetes cluster.
• Kubernetes Ingress resources provide a way to manage external access to services running within the cluster.

Conclusion

By using Pulumi to deploy a Kubernetes cluster with the Acid Zalando PostgreSQL operator and configuring an Ingress resource, we can efficiently manage PostgreSQL databases and provide external access to the service. This solution demonstrates the power of infrastructure as code and the flexibility of Kubernetes in managing complex applications.

Full Code Example

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

// Create a namespace for the PostgreSQL operator
const namespace = new k8s.core.v1.Namespace("postgres-namespace", {
    metadata: { name: "postgres-namespace" }
});

// Deploy the Acid Zalando PostgreSQL operator
const operatorServiceAccount = new k8s.core.v1.ServiceAccount("postgres-operator-sa", {
    metadata: {
        name: "postgres-operator-sa",
        namespace: namespace.metadata.name
    }
});

const operatorClusterRole = new k8s.rbac.v1.ClusterRole("postgres-operator-cr", {
    metadata: { name: "postgres-operator-cr" },
    rules: [
        {
            apiGroups: [""],
            resources: ["pods", "services", "endpoints", "persistentvolumeclaims", "events", "configmaps"],
            verbs: ["*"],
        },
        {
            apiGroups: ["apps"],
            resources: ["deployments"],
            verbs: ["*"],
        },
        {
            apiGroups: ["acid.zalan.do"],
            resources: ["*"],
            verbs: ["*"],
        }
    ]
});

const operatorClusterRoleBinding = new k8s.rbac.v1.ClusterRoleBinding("postgres-operator-crb", {
    metadata: { name: "postgres-operator-crb" },
    subjects: [{
        kind: "ServiceAccount",
        name: operatorServiceAccount.metadata.name,
        namespace: namespace.metadata.name
    }],
    roleRef: {
        kind: "ClusterRole",
        name: operatorClusterRole.metadata.name,
        apiGroup: "rbac.authorization.k8s.io"
    }
});

const operatorDeployment = new k8s.apps.v1.Deployment("postgres-operator-deployment", {
    metadata: {
        name: "postgres-operator",
        namespace: namespace.metadata.name
    },
    spec: {
        replicas: 1,
        selector: { matchLabels: { name: "postgres-operator" } },
        template: {
            metadata: { labels: { name: "postgres-operator" } },
            spec: {
                serviceAccountName: operatorServiceAccount.metadata.name,
                containers: [{
                    name: "postgres-operator",
                    image: "registry.opensource.zalan.do/acid/postgres-operator:v1.7.1",
                    env: [
                        { name: "CONFIG_MAP_NAME", value: "postgres-operator" },
                        { name: "WATCH_NAMESPACE", value: namespace.metadata.name }
                    ]
                }]
            }
        }
    }
});

// Create a PostgreSQL database cluster
const postgresqlCluster = new k8s.apiextensions.CustomResource("postgresql-cluster", {
    apiVersion: "acid.zalan.do/v1",
    kind: "Postgresql",
    metadata: {
        name: "acid-minimal-cluster",
        namespace: namespace.metadata.name
    },
    spec: {
        teamId: "acid",
        volume: {
            size: "1Gi"
        },
        numberOfInstances: 2,
        users: {
            zalando: ["superuser", "createdb"]
        },
        databases: {
            foo: "zalando"
        },
        postgresql: {
            version: "13"
        }
    }
});

// Create an Ingress resource for the PostgreSQL service
const postgresqlIngress = new k8s.networking.v1.Ingress("postgresql-ingress", {
    metadata: {
        name: "postgresql-ingress",
        namespace: namespace.metadata.name,
        annotations: {
            "nginx.ingress.kubernetes.io/rewrite-target": "/"
        }
    },
    spec: {
        rules: [{
            host: "postgres.example.com",
            http: {
                paths: [{
                    path: "/",
                    pathType: "Prefix",
                    backend: {
                        service: {
                            name: "acid-minimal-cluster",
                            port: { number: 5432 }
                        }
                    }
                }]
            }
        }]
    }
});

export const postgresqlClusterEndpoint = postgresqlIngress.metadata.name + ".postgres.example.com";