Setting Up a Read Replica for an RDS Database

Solution Overview

In this solution, we will set up a read replica for an RDS database using Pulumi with TypeScript. The key services involved are Amazon RDS and AWS IAM.

Step-by-Step Explanation

Step 1: Install Pulumi Packages

Ensure you have Pulumi and the AWS SDK installed. You can do this by running:

npm install @pulumi/pulumi @pulumi/aws

Step 2: Create an RDS Instance

First, create the primary RDS instance if you don’t already have one. Here’s an example:

import * as aws from "@pulumi/aws";

const dbInstance = new aws.rds.Instance("dbInstance", {
    engine: "mysql",
    instanceClass: "db.t2.micro",
    allocatedStorage: 20,
    dbName: "mydatabase",
    username: "admin",
    password: "password",
});

Step 3: Create the Read Replica

Next, create the read replica for the primary RDS instance:

const readReplica = new aws.rds.Instance("readReplica", {
    engine: dbInstance.engine,
    instanceClass: dbInstance.instanceClass,
    sourceDbInstanceIdentifier: dbInstance.id,
});

Step 4: Export Outputs

Finally, export the endpoints of both the primary and read replica instances:

export const primaryEndpoint = dbInstance.endpoint;
export const replicaEndpoint = readReplica.endpoint;

Summary

In this guide, we set up a read replica for an RDS database using Pulumi with TypeScript. We created a primary RDS instance and then created a read replica for it. We also exported the endpoints of both instances for further use.

Full Code Example

import * as aws from "@pulumi/aws";

// Create the primary RDS cluster
const dbCluster = new aws.rds.Cluster("dbCluster", {
    engine: "aurora-mysql",
    masterUsername: "admin",
    masterPassword: "password",
    dbSubnetGroupName: "my-subnet-group",
    skipFinalSnapshot: true,
});

// Create the primary RDS instance
const dbInstance = new aws.rds.ClusterInstance("dbInstance", {
    clusterIdentifier: dbCluster.id,
    instanceClass: "db.t2.micro",
    engine: "aurora-mysql",
});

// Create the read replica for the primary RDS cluster
const readReplica = new aws.rds.ClusterInstance("readReplica", {
    clusterIdentifier: dbCluster.id,
    instanceClass: "db.t2.micro",
    engine: "aurora-mysql",
});

// Export the endpoints of both the primary and read replica instances
export const primaryEndpoint = dbInstance.endpoint;
export const replicaEndpoint = readReplica.endpoint;