Book Image

AWS Administration - The Definitive Guide

By : Yohan Wadia, Naveen Kumar Vijayakumar
Book Image

AWS Administration - The Definitive Guide

By: Yohan Wadia, Naveen Kumar Vijayakumar

Overview of this book

AWS is at the forefront of Cloud Computing today. Many businesses are moving away from traditional datacenters and toward AWS because of its reliability, vast service offerings, lower costs, and high rate of innovation. Because of its versatility and flexible design, AWS can be used to accomplish a variety of simple and complicated tasks such as hosting multitier websites, running large scale parallel processing, content delivery, petabyte storage and archival, and lots more. Whether you are a seasoned sysadmin or a rookie, this book will provide you with all the necessary skills to design, deploy, and manage your applications on the AWS cloud platform. The book guides you through the core AWS services such as IAM, EC2, VPC, RDS, and S3 using a simple real world application hosting example that you can relate to. Each chapter is designed to provide you with the most information possible about a particular AWS service coupled with easy to follow hands-on steps, best practices, tips, and recommendations. By the end of the book, you will be able to create a highly secure, fault tolerant, and scalable environment for your applications to run on.
Table of Contents (17 chapters)
AWS Administration – The Definitive Guide
About the Author
About the Reviewer

An overview of security groups

We talked briefly about security groups in the previous chapter, but in this section, we will be looking at them in a bit more in detail. Security Groups are simple, yet powerful ways using which you can secure your entire EC2 environment. You can use Security Groups to restrict and filter out both the ingress and egress traffic of an instance using a set of firewall rules. Each rule can allow traffic based on a particular protocol—TCP or UDP, based on a particular port—such as 22 for SSH, or even based on individual source and destination IP addresses. This provides you with a lot of control and flexibility in terms of designing a secure environment for your instances to run from.

Let's look at how you can edit an existing Security Group using the EC2 dashboard.

From the EC2 dashboard, select the Security Groups option located under the Network & Security section as shown here:

This will display a list of currently created and in use Security Groups present...