Book Image

AWS Certified SysOps Administrator ??? Associate Guide

By : Marko Sluga
Book Image

AWS Certified SysOps Administrator ??? Associate Guide

By: Marko Sluga

Overview of this book

AWS certifications are becoming one of the must have certifications for any IT professional working on an AWS Cloud platform. This book will act as your one stop preparation guide to validate your technical expertise in deployment, management, and operations on the AWS platform. Along with exam specific content this book will also deep dive into real world scenarios and hands-on instructions. This book will revolve around concepts like teaching you to deploy, manage, and operate scalable, highly available, and fault tolerant systems on AWS. You will also learn to migrate an existing on-premises application to AWS. You get hands-on experience in selecting the appropriate AWS service based on compute, data, or security requirements. This book will also get you well versed with estimating AWS usage costs and identifying operational cost control mechanisms. By the end of this book, you will be all prepared to implement and manage resources efficiently on the AWS cloud along with confidently passing the AWS Certified SysOps Administrator – Associate exam.
Table of Contents (26 chapters)

Creating and restoring snapshots

The RDS service supports creating database snapshots (sometimes also called database backups), which are point-in-time copies of a complete volume where the database resides. The snapshots are created incrementally, meaning that only the blocks of the volume that have changed since the last snapshot are saved to the next snapshot. This essentially means that the same characteristics apply to RDS snapshots as EC2 snapshots, with one exception: when creating an RDS snapshot, the instance I/O will be frozen due to the fact that the RDS snapshots need to be consistent and can be used as ACID-compliant backups of your database. This will mean that, when using a single instance, the instance will become unavailable for anywhere from a few seconds to a few minutes while the snapshot is being taken, depending on the size of the data in the snapshot being...