Application Versions

5 minutes 5 Questions

Application versions are archives comprising of source codes, dependencies, configuration files, and other components necessary for deploying an application in Elastic Beanstalk. They serve as a snapshot of the app’s state, making it easy to track, manage, and switch between multiple versions. Thanks to application versions, a developer can quickly roll back to a previous version, easing out the deployment process. Elastic Beanstalk stores and manages these versions in the Amazon S3 bucket, making it easier to manage multiple versions of a single application.

Guide: Understanding Application Versions in AWS Elastic Beanstalk

What is it?
In AWS Elastic Beanstalk, application versions refer to iterations of deployable code. Each application version is associated with a specific AWS Elastic Beanstalk application and you can maintain and manage different versions.

Why is it important?
Understanding Application Versions is important as it allows you to handle updates and changes in your applications resulting in reducing development and deployment efforts. It enables you to roll back to older versions if the new version introduces a bug or error.

How it works?
When you create an application version in the Elastic Beanstalk environment, you can specify the source bundle, a .zip or WAR file that contains your application's source code. Each application version points to an Amazon S3 object that contains the deployment package.

Exam Tips: Answering Questions on Application Versions
When answering questions regarding Application Versions in an exam, remember that each version is unique and can be used to deploy the same application across different environments. Remember, Elastic Beanstalk retains information about the application versions but doesn't store the actual source bundles; they are stored in Amazon S3. Understanding of the lifecycle policy of application versions could be critical for the questions in exams.

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Question 1

A company wants to test their new application code in Elastic Beanstalk without impacting their production environment. Which deployment policy should the solutions architect select?

AllAtOnce Rolling Immutable Rolling with additional batch

Correct Answer: AllAtOnce

The AllAtOnce deployment policy updates all instances simultaneously, which is suitable for testing new application code in a non-production environment. The other policy options are used for controlled, gradual deployments and to avoid downtime in production environments.

Question 2

A solutions architect is implementing a Blue-Green deployment strategy for an application hosted on Elastic Beanstalk. Which of the following options best supports this deployment strategy?

Create an entirely new Elastic Beanstalk application, deploy the new version, and manually redirect user traffic. Deploy the new application version directly to the production environment and rely on Elastic Beanstalk health checks for stability. Create a new environment with the new application version, then swap CNAMEs between environments. Use AWS CodeDeploy to deploy the new version directly to the instances behind the load balancer.

Correct Answer: Create a new environment with the new application version, then swap CNAMEs between environments.

Creating a new environment with the new application version, and then swapping CNAMEs between environments is the best approach for a Blue-Green deployment as it allows testing the new version in a separate environment before switching user traffic without interruption or the need for manual rollback.

Question 3

A company is deploying a new application version to Elastic Beanstalk. They need the ability to rollback quickly to the previous version in case there is a problem with the new release. Which of the following options is the best solution?

Upload the new code to an S3 bucket and switch the application source between S3 buckets. Overwrite the existing application version with the new code, manually backup the old code. Create a new application version in Elastic Beanstalk and deploy it to the existing environment, allowing for easy rollback. Deploy the new application version to a new Elastic Beanstalk environment and delete the old environment.

Correct Answer: Create a new application version in Elastic Beanstalk and deploy it to the existing environment, allowing for easy rollback.

Creating a new application version in Elastic Beanstalk and deploying it to the existing environment retains the old version, allowing for easy rollback in case of any issues. All the other methods involve manual steps, disrupt the existing environment, or are not suitable for quick rollback.

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