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How do I implement disaster recovery strategies on AWS using Terraform?

Disaster Recovery Strategies on AWS

This guide will outline how to set up disaster recovery strategies on AWS, focusing on the key components needed for a resilient infrastructure. We will set up an S3 bucket for backups, an RDS instance with a read replica in a different region, and an EC2 instance in a different availability zone to ensure high availability and quick recovery in case of a disaster.

Program Overview

Below is a program that includes:

  • Creation of an S3 bucket for storing backups.
  • Deployment of an RDS instance with a cross-region read replica.
  • Setup of an EC2 instance in a different availability zone for failover.

This setup ensures that we have multiple layers of redundancy, making sure that your data and services are available even in the event of a regional outage.

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

const backupBucket = new aws.s3.BucketV2("backup_bucket", {
    bucket: "my-backup-bucket",
    acl: "private",
    versionings: [{
        enabled: true,
    }],
    lifecycleRules: [{
        id: "clean-old-versions",
        enabled: true,
        noncurrentVersionExpirations: [{
            days: 90,
        }],
    }],
});
const primaryDb = new aws.rds.Instance("primary_db", {
    identifier: "my-primary-db",
    allocatedStorage: 20,
    engine: "mysql",
    instanceClass: aws.rds.InstanceType.T2_Micro,
    name: "mydb",
    username: "admin",
    password: "password",
    parameterGroupName: "default.mysql5.6",
    backupRetentionPeriod: 7,
    multiAz: true,
});
const readReplica = new aws.rds.Instance("read_replica", {
    identifier: "my-read-replica",
    replicateSourceDb: primaryDb.id,
    instanceClass: aws.rds.InstanceType.T2_Micro,
    availabilityZone: "us-east-1a",
});
const web = new aws.ec2.Instance("web", {
    ami: "ami-0c55b159cbfafe1f0",
    instanceType: aws.ec2.InstanceType.T2_Micro,
    availabilityZone: "us-east-1a",
    tags: {
        Name: "FailoverWebServer",
    },
});
export const backupBucketArn = backupBucket.arn;
export const primaryDbAddress = primaryDb.address;
export const readReplicaAddress = readReplica.address;
export const webInstancePublicIp = web.publicIp;

Key Points:

  • S3 Bucket: Used for storing backups with versioning to maintain data consistency.
  • RDS Instance: A primary database instance with a read replica in a different region to ensure availability.
  • EC2 Instance: An instance in a different availability zone to handle failover.

Summary

We have set up disaster recovery strategies on AWS by creating an S3 bucket for backups, deploying an RDS instance with a cross-region read replica, and setting up an EC2 instance in a different availability zone. This ensures high availability and quick recovery in case of a disaster.

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