How to Make High Availability Web Applications on Amazon Web Services

An average software developer takes more than 13 hours to fix a single source error in an application. 

Imagine what it would be like if your software or app broke down in the middle of an important meeting! It would be frustrating right? 

This is why the concept of High Availability has been initiated. It focuses on increasing the runtime of an application far above the standard industrial norm. 

But what facilitates this leverage? 

Well, there are statistically more than 800 cloud service providers, amongst which the Amazon Web Services is considered to be top notch. 

From here on if your interest pops up for learning more about the Amazon Web Services, then we have more in store for you! 

You can now enroll for an AWS training and certification course or an AWS certification course. The details of the same have been discussed in the final section of this blog. 

Purpose of using Amazon web Services

Reliable, free to join, scalable, and inexpensive! Well, these are only some of the many adjectives to describe the Amazon Web Services. 

The main purpose of using the Amazon Web Services is to make sure that the Web applications do not run into major problems if new instances are added into the application. 

Following are some of the purposes served by the Amazon Web Services:

  • The upgrades can be deployed without hampering current user experience. 
  • Since the whole system is automated, the instance hardware failure can be completely avoided. In such a case a new instance will be deployed automatically. 
  • Zonal failures can be avoided as well due to the presence of auto scaling. New instances will be deployed into healthy zones on an immediate basis. 
  • The number of users can be monitored using the cloud service for Amazon Web Services. 

Amazon web services for high availability web applications

Affording cutting edge technology does not mean you have to push your expenses. 

This is one of the main reasons why the Amazon Web Services has been a top priority for the Small, Medium Enterprises. 

Check out the following advantages that are effectively served by AWS:

Dominant in-class functionality

Most providers demand availability from 99.99 to 99.999%.

So providing more than 200 services and a plethora of cloud computing logistics, the AWS has surpassed other cloud services by more than a marginal gap. 

Demonstrating operational expertise

For business and other use-cases there is no other cloud service that has been providing excellent and reliable computational services since the past 15 years. 

Rapid innovation

There is a reason why AWS is currently one of the most inexpensive cloud services available in the market. It owes its growth to rapid innovation. 

This has helped broaden the customer base of the company, and they have currently obtained an unmatched level of support. 

If you are here for the “how” part of the blog then we have discussed the implementation part at length in the following section. 

Implementing Amazon Web Services for high availability

The implementation process will be difficult to comprehend. So it is majorly divided into two operational categories namely Dev and Ops. 


Since software development is a one way parallel street, we have the Software Developers also known as the “Dev” part of the composition. 

After your system has launched, you need to follow the steps mentioned below to initiate the process. 

This mainly is applicable for Linux servers and machines. The steps for the script which we have mentioned below for this document shall be executed when the machine is started. 

The steps for creating the script remains unhinged for all the Linux servers:

  • Start by logging in the root user. 
  • Initiate the creation of a directory and name it as instance-init for the root directory. 
  • This is where you will create the script for the application and add the additional information that will be required before the machine is booted. 
  • After completing this process, type crontab-e. This will launch a Crontab file. 
  • Finally, restart the machine and you will find that the script has been executed automatically. 


The steps we have mentioned below are carried out in the AWS Management Console. Execute them in the provided order to make sure that High Availability is attained:

  • A screenshot of the required instance which is to be captured when the instance is not being run. 
  • An Amazon Machine Image or AMI is created using the screenshot. 
  • Following this, a launch configuration is synthesized using the AMI. It is created to ensure that the auto-scaling group will take  the launch configuration to develop an instance. 
  • As mentioned in the previous step, an auto-scaling group is developed based upon the launch configuration. 
  • Afterwards, every launch set will be eligible to create two subnets depending on the minimum and maximum instances that are required. 
  • The security groups associated with these instances will be required to accept requests from RDB and ELB. 
  • Next up, we have to create an elastic load balancer which will be forwarding any internet traffic from port 80/443 to the AS group. 
  • Now you have to create an IP address which will route the users to host web applications.
  • Finally, Simple Notification Service is created to alarm the CPU for handling load that surpases instances by 75%

For practical demonstration of the whole process, consider joining an AWS certification course. 

Aws certification courses

From beginner to pro level, here are some of the top AWS courses:

  • AWS Fundamentals: This is a beginner level course catered towards cloud API. 
  • AWS Cloud Practitioner: This is an intermediate level course based on cloud computing and infrastructure. 
  • Practical Data Science for AWS cloud: This is an advanced level course highlighting the importance of AI and deep learning. 

Final words

Statistically, AWS currently stands as one of the top cloud service providers with a market share of 33%.

Based on this information we are currently observing a hike in the value of the AWS training and certification courses or an AWS certification course.

by Rajat Patel

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