You're reading from AWS Certified Solutions Architect ??? Associate Guide

Product typeBook

Published inOct 2018

PublisherPackt

ISBN-139781789130669

Edition1st Edition

Tools

AWS

Concepts

IT Certification

Authors (2):

Gabriel Ramirez

Stuart Scott

View More author details

Resilient Patterns

Application and service availability can be extended to the regional level, AWS provides simple and yet powerful mechanisms to achieve global audiences and the option to use different construction blocks to build resiliency such as disaster recovery options and super available applications. This chapter presents a pattern to use Route 53 as the de facto solution to achieve higher levels of service by introducing DNS failover.

The following topics will be covered in this chapter:

Route 53
- Health checks
- Record types

Technical requirements

Register a domain name with Route 53, for more information use the following docs: https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/registrar.html.

Route 53

Our deployment will consist or two EC2 instances configured with regional availability. Route 53 provides the following routing types:

Simple routing: Use this routing for simple servers, this is used for simple resolution
Geolocation routing policy: Route traffic with the minimal latency
Geoproximity routing policy: This is configured via traffic flow for complex routing
Multivalue answer routing policy: Randomize up to 8 records
Weighted routing policy: Assign specific weights to records (for example, 80% - 20% split)
Failover routing policy: For active-passive scenarios

We will use the failover routing policy to create the following architecture:

Primary	N. California
Secondary	N. Virginia

To provision your environment launch an EC2 instance on each region (us-east-1 and us-west-1). You can use the following script for the user data from user-data...

Summary

This chapter showed the service capabilities of Route 53 with an overview of the principal routing types available and performing an active-passive configuration for a multi-region deployed web server. We used health checks to perform broad testing and configured a public hosted zone, simulated a service failure and validated the automatic failover performed via Route 53.

Gabriel Ramirez is a passionate technologist with a broad experience in the Software Industry, he currently works as an Authorized Trainer for Amazon Web Services and Google Cloud. He is holder of 9/9 AWS Certifications and does community work by organizing the AWS User Groups in Mexico.
Read more about Gabriel Ramirez

Stuart Scott

Stuart Scott is the AWS content lead at Cloud Academy where he has created over 40 courses reaching tens of thousands of students. His content focuses heavily on cloud security and compliance, specifically on how to implement and configure AWS services to protect, monitor and secure customer data in an AWS environment. He has written numerous cloud security blogs Cloud Academy and other AWS advanced technology partners. He has taken part in a series of cloud security webinars to share his knowledge and experience within the industry to help those looking to implement a secure and trusted environment. In January 2016 Stuart was awarded 'Expert of the Year' from Experts Exchange for his knowledge share within cloud services to the community.
Read more about Stuart Scott

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