Amazon Elastic Compute Cloud (Amazon EC2) is a web service that provides resizable compute capacity in the cloud. Amazon Cloud Computing is a good choice if you want to deploy a very large scale network on the cloud that requires high availability, auto scaling and load balancing features.
This article is a quick introduction on designing to achieve High Availability (HA) with your AWS infrastructure architecture. We’ll start with a simple (and vulnerable) architecture design and work our way up to a complex multi-region setup. How far you go up these steps is up to you, depending on your uptime requirements (or SLAs) and budget.
The prsentation brought you by Jared Rosoff, Director of Product Marketing and Technical Alliances at 10gen. The presentation includes an overview of MongoDB deployment on Amazon cloud service. You will also find some basic operational considerations with regards to deployment, backup and security management. Jared also published an interesting NoSQL database comparison on his blog, we strongly advice you to review.
The traffic of a typical web application directly linked to the amount of concurrent users that use the system. The variations in daily traffic volumes generated by a typical web application match our daily life schedule. Data Traffic transfer, running the application on Amazon cloud, can mean substantial costs. These cloud costs can even amount to more than half the overall charges for all instances utilized for the same amount of time.
1 - Outbound data transfer, between regions as well as out of the Amazon cloud.
2 - ELB data transfer fees across availability zones (AZ).
In this article I describe how we created a redundant PostgreSQL database on the Amazon cloud using EBS snapshots as backups to deploy a PostgreSQL DB server DR mobile application for one of our customers.
PostgreSQL 9.1 includes new capabilities for asynchronous fast replication syncing between master and slaves. The master server streams new data to the current available slave. This version includes great improvements that generated significant fast WAL (Write Ahead Log) processing, which generates replication and fast launching capabilities for the slave servers.
AWS Elastic Load Balancing (ELB) automatically distributes incoming traffic to your application to multiple EC2 instances that are attached to your Elastic Load Balancer. At any time, Elastic Load Balancing detects the unhealthy instances in the pool, and distributes the incoming traffic only to the healthy instances until the unhealthy ones are restored.
In order to achieve greater fault tolerance and thus higher availability, it is recommended to distribute your instances in different geographical zones so that if all the instances in a single datacenter are not healthy, as may occur when there is an outage, your application will run in a data center in a different zone.
