Blog Feed Post

Migrating Existing Apps to AWS Cloud


Few weeks back, I was part of a Panel discussion in the Chennai Cloud User Group un- conference.

Almost all the members of the group had one question, how do you make your existing web application run in the Cloud Environment? I am sure, all who wants to migrate to the Cloud for the first time, would be asking this question to themselves. Though it is a basic one, I believe there needs to be a systematic approach towards achieving this.

I am sure you all know about Amazon Cloud, but for those who do not know about AWS, please visit http://aws.amazon.com website and create an account using your credit card. You will not be charged for anything upfront. :-)

Some of the useful tools that are available to manage the AWS Cloud are Hybridfox, CloudBuddy Personal, Elasticfox, S3fox...etc. These tools have more features than any of the tools available in the market.

Well, In general to move your applications to the Cloud, you don't really need to do any changes. All you need to know is how the Cloud works. Cloud languages like Machine Image (EBS or S3 based), instance, Security Group, user data, Availability Zones, CloudFront, SQS, RDS..etc This can be easily picked up if you spend about a day or two in AWS website. But, if you want leverage the inherence advantages of Cloud, you need to really have a solid design in place, and that’s what I have described here with our own experience of moving an existing application to the AWS Cloud.


Examine the Current Application Deployment Architecture

Before moving your apps to Cloud, you must be familiar with your current application deployment architecture and its non functional requirements (NFR's) such as availability, scalability, security, performance...etc. This would enable you to clearly map the Cloud building blocks to your existing application architecture.

Let me show you this via an example,

In my organization, we had a CRM which was serving for about 100 concurrent requests per second, hosted in our own data center. While, we decided to move it to the Cloud, it looked like very simple thing to do. But, while we analyzed, we came up with the following non functional requirements that are needs to be addressed. I have detailed our solution to each of the issues listed below.

1. Application provisioning & configuration

2. Backup of the database required to be automated

3. Caching services using Memcache to be implemented

4. Single Sing On, the server is available in the enterprise data center and we had to authenticate from the Cloud

5. Emailing from the Cloud - Since it is a CRM, the main way of communicating to our customers are via email

6. Shared file system for storing files, images...etc

7. Secured Access using SSL

8. Payment gateway integration

9. SLA for application performance (every request should be served with a response, within 3 Sec of originally receiving it)

10. Auto scaling to support additional spiking need

Solution - Design your Cloud Deployment

Our Cloud Architects have designed the architecture to satisfy the NFR's listed above and they came up with almost completely, a new deployment architecture, due to the nature of AWS Cloud.

Application Provisioning & configuration

An application in the local data center is provisioned & configured once by the administrators. But our Architects proposed a new approach to do the same installation by automating the provisioning & configuration. The reason behind this is, when you want to automatically scale your applications to handle more loads, you may not be able to perform the following steps manually in the Cloud environment. Because doing this manually requires someone to monitor the performance of the Application, based on the load, he may need to decide to launch an another supporting instance to handle to load, when the application server instance boots up, the server engineer may need configure the required parameters such as Database instance IP address, Memcache server IP address, SSL certs deployment, changes in your web application configurations...etc manually. This is a tedious process and the human intervention required to do this can be completely avoided. Secondly, in the AWS Cloud though they have SLA's for the availability of their data centers in various regions, they do not guarantee for the life time of the instance. Which means at any point in time, your instances may fail( very rare) but, we need to accommodate the failure as well. "Design for failure", so that nothing fails, is the key for successful Cloud App. you can also, take a look at Jinesh's presentation on slideshare (http://www.slideshare.net/AmazonWebServices/aws-architectingjvariafinal)

Backup of your database

In general backup's are pointed to a local drive and the backup tools that you use can extract the content and store it in a local hard drive. Now in the AWS Cloud, you may use either S3 (link to S3) or EBS (link to Ec2-EBS). Our architects have chosen to go with S3 due to its new reliability support at the API level. And we used CloudBuddy WEBDEV (you can use s3fuse, if it is a linux) to mount the S3 backup buckets to the EC2 instances running our CRM application database to completely automated the backup.

Memcache for caching information

Memcache is kind of a straight forward setup, but we had to configure each instance running the Memcache. We have decided to use CloudSmart to configure the Memcache instances.

Single Sign On

Single Sign on residing on our local data center premise provides domain verification mechanism and we used that feature to authenticate the caller machine from the Cloud before proceeding to the user authentication process.

Emailing from the Cloud

Emailing from the Cloud is kind of restricted beyond certain number of emails, which requires a special permission from AWS and we obtained the permission from AWS by submitting a form. You need to have a domain name associated with the instance to send emails to the outside world.

Shared file System

Shared file system can be achieved using SAMBA, NFS, network share...etc. Due to the nature of Cloud, it is a best practice to store the files in S3 for reliability, security & availability reasons. We have used CloudBuddy WebDEV to mount S3 bucket as a drive in both Windows & Linux operation systems. Alternatively you can also use S3FUSE to mount buckets as a drive for your linux operation system.

SSL Implementation

SSL was required to be installed in all the front ending machines in Apache, CloudSmart is used to automate the installation at every end point.

Payment Gateway Integration

Payment gateway integration requires Level 1 PCI compliance as per our policy, so we decided to keep the payment processing engine at our data center premise and redirect from the CRM hosted on the Cloud.

 Performance of the Cloud Application

The performance of the CRM is measured using our CloudTestGo platform and our Cloud Architect's have come up with the following recommendations to satisfy the 3Secs serving time requirement. This design is expected to serve 100 concurrent hits at any point of given time with a TTL for every request is 3 Secs.

          - Use CloudFront to serve the static content such as HTML, images, Javascript...etc

          - 3 Medium instances behind the load balancers, to handle SSL transformation to non-SSL requests

          - 2 Large instance running IIS with windows 2008 64-bit

          - 2 large instance to host the SQL Server database which is clustered

 Auto scaling was achieved for all the three layers such as web, application & DB layer.

Web Layer (Apache Servers) - If the web server instance gets more than 70% network utilized, the Auto scaling mechanism of AWS will launch an another instance of the same image. This will allow the installed CloudSmart to do the necessary configuration in the AWS environment such as adding the machine to the Auto Scaling group, copying the new httpd.conf...etc

Application Layer ( IIS) - When the IIS instance gets more than 70% network utilized, the Auto scaling mechanism of AWS will launch an another instance of the same image. This will allow the installed CloudSmart to do the necessary configuration in the AWS environment such as adding the machine to the Auto Scaling group, Copying the ASP.NET application, mounting EBS volume as a drive..etc

DB Layer (MS SQL Server 2008) - All the calls to the database was distributed by the SQL Server Cluster itself and the load on the individual cluster node will automatically launch an instance and create necessary configuration to join the Cluster group.


It is understood that moving apps to Cloud is straight forward but the key factor is to use the advantages of the Cloud, which is nothing but automating every aspects of your application deployment. And that can be very well achieved through the available open source technologies itself.

Read the original blog entry...

More Stories By Ezhil Arasan Babaraj

At present building a start-up called Qruize Technologies. Qruize is an Information & Communication Technology Start-up based out of Chennai, India. The company comprises of two strategic business units, Qruize Labs- boutique technology research & consulting services and Qruize Apps- social media products and services. We are currently establishing our own operations in the USA and entering into strategic partnerships in the EMEA region.
Website : http://qruize.com, http://qruizemedia.com
blog : http://qruizetech.wordpress.com
Specialties Technology Strategy Consulting, Cloud Computing, Grid Computing, Enterprise Portal Architecture, Software Architecture, Application Framework Design and Development

Latest Stories
The past few years have brought a sea change in the way applications are architected, developed, and consumed—increasing both the complexity of testing and the business impact of software failures. How can software testing professionals keep pace with modern application delivery, given the trends that impact both architectures (cloud, microservices, and APIs) and processes (DevOps, agile, and continuous delivery)? This is where continuous testing comes in. D
Recently, REAN Cloud built a digital concierge for a North Carolina hospital that had observed that most patient call button questions were repetitive. In addition, the paper-based process used to measure patient health metrics was laborious, not in real-time and sometimes error-prone. In their session at 21st Cloud Expo, Sean Finnerty, Executive Director, Practice Lead, Health Care & Life Science at REAN Cloud, and Dr. S.P.T. Krishnan, Principal Architect at REAN Cloud, discussed how they built...
Mobile device usage has increased exponentially during the past several years, as consumers rely on handhelds for everything from news and weather to banking and purchases. What can we expect in the next few years? The way in which we interact with our devices will fundamentally change, as businesses leverage Artificial Intelligence. We already see this taking shape as businesses leverage AI for cost savings and customer responsiveness. This trend will continue, as AI is used for more sophistica...
In his Opening Keynote at 21st Cloud Expo, John Considine, General Manager of IBM Cloud Infrastructure, led attendees through the exciting evolution of the cloud. He looked at this major disruption from the perspective of technology, business models, and what this means for enterprises of all sizes. John Considine is General Manager of Cloud Infrastructure Services at IBM. In that role he is responsible for leading IBM’s public cloud infrastructure including strategy, development, and offering m...
The “Digital Era” is forcing us to engage with new methods to build, operate and maintain applications. This transformation also implies an evolution to more and more intelligent applications to better engage with the customers, while creating significant market differentiators. In both cases, the cloud has become a key enabler to embrace this digital revolution. So, moving to the cloud is no longer the question; the new questions are HOW and WHEN. To make this equation even more complex, most ...
In his session at 21st Cloud Expo, Raju Shreewastava, founder of Big Data Trunk, provided a fun and simple way to introduce Machine Leaning to anyone and everyone. He solved a machine learning problem and demonstrated an easy way to be able to do machine learning without even coding. Raju Shreewastava is the founder of Big Data Trunk (www.BigDataTrunk.com), a Big Data Training and consulting firm with offices in the United States. He previously led the data warehouse/business intelligence and B...
Blockchain is a shared, secure record of exchange that establishes trust, accountability and transparency across business networks. Supported by the Linux Foundation's open source, open-standards based Hyperledger Project, Blockchain has the potential to improve regulatory compliance, reduce cost as well as advance trade. Are you curious about how Blockchain is built for business? In her session at 21st Cloud Expo, René Bostic, Technical VP of the IBM Cloud Unit in North America, discussed the b...
SYS-CON Events announced today that Synametrics Technologies will exhibit at SYS-CON's 22nd International Cloud Expo®, which will take place on June 5-7, 2018, at the Javits Center in New York, NY. Synametrics Technologies is a privately held company based in Plainsboro, New Jersey that has been providing solutions for the developer community since 1997. Based on the success of its initial product offerings such as WinSQL, Xeams, SynaMan and Syncrify, Synametrics continues to create and hone in...
With tough new regulations coming to Europe on data privacy in May 2018, Calligo will explain why in reality the effect is global and transforms how you consider critical data. EU GDPR fundamentally rewrites the rules for cloud, Big Data and IoT. In his session at 21st Cloud Expo, Adam Ryan, Vice President and General Manager EMEA at Calligo, examined the regulations and provided insight on how it affects technology, challenges the established rules and will usher in new levels of diligence arou...
Nordstrom is transforming the way that they do business and the cloud is the key to enabling speed and hyper personalized customer experiences. In his session at 21st Cloud Expo, Ken Schow, VP of Engineering at Nordstrom, discussed some of the key learnings and common pitfalls of large enterprises moving to the cloud. This includes strategies around choosing a cloud provider(s), architecture, and lessons learned. In addition, he covered some of the best practices for structured team migration an...
As you move to the cloud, your network should be efficient, secure, and easy to manage. An enterprise adopting a hybrid or public cloud needs systems and tools that provide: Agility: ability to deliver applications and services faster, even in complex hybrid environments Easier manageability: enable reliable connectivity with complete oversight as the data center network evolves Greater efficiency: eliminate wasted effort while reducing errors and optimize asset utilization Security: imple...
The 22nd International Cloud Expo | 1st DXWorld Expo has announced that its Call for Papers is open. Cloud Expo | DXWorld Expo, to be held June 5-7, 2018, at the Javits Center in New York, NY, brings together Cloud Computing, Digital Transformation, Big Data, Internet of Things, DevOps, Machine Learning and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding busin...
No hype cycles or predictions of a gazillion things here. IoT is here. You get it. You know your business and have great ideas for a business transformation strategy. What comes next? Time to make it happen. In his session at @ThingsExpo, Jay Mason, an Associate Partner of Analytics, IoT & Cybersecurity at M&S Consulting, presented a step-by-step plan to develop your technology implementation strategy. He also discussed the evaluation of communication standards and IoT messaging protocols, data...
Companies are harnessing data in ways we once associated with science fiction. Analysts have access to a plethora of visualization and reporting tools, but considering the vast amount of data businesses collect and limitations of CPUs, end users are forced to design their structures and systems with limitations. Until now. As the cloud toolkit to analyze data has evolved, GPUs have stepped in to massively parallel SQL, visualization and machine learning.
Modern software design has fundamentally changed how we manage applications, causing many to turn to containers as the new virtual machine for resource management. As container adoption grows beyond stateless applications to stateful workloads, the need for persistent storage is foundational - something customers routinely cite as a top pain point. In his session at @DevOpsSummit at 21st Cloud Expo, Bill Borsari, Head of Systems Engineering at Datera, explored how organizations can reap the bene...