Book Image

Designing AWS Environments

By : Mitesh Soni, Wayde Gilchrist
Book Image

Designing AWS Environments

By: Mitesh Soni, Wayde Gilchrist

Overview of this book

Amazon Web Services (AWS) provides trusted,cloud-based solutions to help you meet your business needs. Running your solutions in the AWS Cloud can help you get your applications up and running faster while providing the security to meet your compliance requirements. This book begins by familiarizing you with the key capabilities to architect and host applications, websites, and services on AWS. We explain the available options for AWS free tier with virtual instances and demonstrate how you can launch and connect them. Using practical examples, you’ll be able to design and deploy networking and hosting solutions for large deployments. Finally, the book focuses on security and important elements of scalability and high availability using AWS VPC, Elastic Load Balancing, and Auto scaling. By the end of this book, you will have handson experience of working with AWS instances,VPC, Elastic Load Balancing, and Auto scalingrelated tasks on Amazon Web Services.
Table of Contents (12 chapters)

Getting started with VPCs

In this section, we will begin with a little history lesson by talking about classic EC2s, and comparing them with EC2s that are launched in a VPC. 

Classic EC2s

EC2s were first introduced by AWS back in 2006. Back then, there was only one big public network in which to launch your instances. Every instance was automatically assigned a public and private IP address, controlled by AWS. If you stopped your instance for any reason, AWS took back your IPs, and when you started it up again, you got new ones.

Since every instance had a public IP address, they were all essentially public. So you had to rely on security groups to restrict access to your databases and other instances that you wanted to keep private, and the security groups only allowed you to specify inbound rules. All outbound traffic was always allowed. In 2009, AWS launched VPCs and encouraged customers to launch instances in these virtual private networks, instead of in the big public network. EC2s that...