This tutorial explains how to set up a highly available NFS server that can be used as storage solution (NAS – networked attached storage) for a cluster of web server instances that are being load balanced by a load balancer , for example ELB . If you have a web server cluster with two or more instances that serve the same web site contents, then these instances must access the same amount of data so that each one serves the same data, no matter if the load balancer directs the user to instance 1 or instance n. This can be achieved with an NFS share on an NFS server that all web server instances (the NFS clients) can access. Read more…
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Root Partition Size Limitation for EC2 Instances on AWS Cloud
Tuesday, March 30th, 2010 | Posted in Cloud computing
Eventhough AWS is a great cloud computing service , it does have it’s own disadvantages . We are not going to discuss all of them here but we will look into one of them . If you have launched EC2 instances from Amazon Machine Images ( AMI ) , you might have seen that the size of the root partition ( / ) is only 10GB for all the instances . So to test if we can have more than 10GB for root partition , we tried the following Read more…
How to configure Memcached on AWS EC2: A Starter’s Guide
Saturday, March 20th, 2010 | Posted in Cloud computing
Memached is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load and session management. Lets focus on session management first and build up a caching daemon to store PHP sessions in a load balanced environment. In this post I will explain how you can easily install it and make it available in LAMP. Read more…
Postgresql on EC2
If you are looking forward to migrating your PostgreSQL database to AWS EC2 cloud servers, you can do so by following the simple steps we have posted below. You can make it more reliable and secure from accidental EC2 instance crashing by allowing the postgresql server to run from an EBS volume. You can also take a snapshot of the EBS volume which will be stored on AWS storage service s3 which will make it highly reliable by making it available on multiple AWS availability zones that spans across datacenters. Read more…
Quick start with Elastic Load Balancer (ELB ) on EC2
Wednesday, January 27th, 2010 | Posted in Cloud computing
Elastic Load Balancing ( ELB ) is an AWS load balancer service that is readily available for users who have signed up for AWS EC2 and s3 services . ELB is configured to automatically distribute incoming application traffic across multiple Amazon EC2 instances . Recently AWS has announced support for ELB to the AWS Management Console which will give users a simple, point-and-click web interface to create and configure load balancers for the AWS EC2 instances .
Below are the simple steps to configure ELB for webserver from the command line . Read more…
