Learn how to use EC2 Image Builder and AWS CodeDeploy to reduce the time that elapses before an EC2 instance becomes available in an Auto Scaling group. Compare the benefits and drawbacks of different solutions and find out how to validate the images.
Table of Contents
Question
An application uses an Amazon EC2 Auto Scaling group. A developer notices that EC2 instances are taking a long time to become available during scale-out events. The UserData script is taking a long time to run.
The developer must implement a solution to decrease the time that elapses before an EC2 instance becomes available. The solution must make the most recent version of the application available at all times and must apply all available security updates. The solution also must minimize the number of images that are created. The images must be validated.
Which combination of steps should the developer take to meet these requirements? (Choose two.)
A. Use EC2 Image Builder to create an Amazon Machine Image (AMI). Install all the patches and agents that are needed to manage and run the application. Update the Auto Scaling group launch configuration to use the AMI.
B. Use EC2 Image Builder to create an Amazon Machine Image (AMI). Install the latest version of the application and all the patches and agents that are needed to manage and run the application. Update the Auto Scaling group launch configuration to use the AMI.
C. Set up AWS CodeDeploy to deploy the most recent version of the application at runtime.
D. Set up AWS CodePipeline to deploy the most recent version of the application at runtime.
E. Remove any commands that perform operating system patching from the UserData script.
Answer
B. Use EC2 Image Builder to create an Amazon Machine Image (AMI). Install the latest version of the application and all the patches and agents that are needed to manage and run the application. Update the Auto Scaling group launch configuration to use the AMI.
C. Set up AWS CodeDeploy to deploy the most recent version of the application at runtime.
Explanation
The correct answer is B and C. Use EC2 Image Builder to create an Amazon Machine Image (AMI). Install the latest version of the application and all the patches and agents that are needed to manage and run the application. Update the Auto Scaling group launch configuration to use the AMI. Set up AWS CodeDeploy to deploy the most recent version of the application at runtime.
Here is an explanation of why this combination of steps will meet the requirements:
- The problem is that the developer is using an EC2 Auto Scaling group, and notices that EC2 instances are taking a long time to become available during scale-out events. The UserData script is taking a long time to run. The developer wants to decrease the time that elapses before an EC2 instance becomes available, and also ensure that the most recent version of the application is available at all times, and that all security updates are applied. The developer also wants to minimize the number of images that are created, and validate them before using them.
- To solve this problem, the developer needs to use a combination of services and features that can create and manage customized images for EC2 instances, and deploy the latest version of the application to them. The developer also needs to optimize the UserData script to reduce its execution time.
- The solution that meets these requirements is to use EC2 Image Builder and CodeDeploy. EC2 Image Builder is a service that automates the creation, management, and deployment of customized images for EC2 instances. It can install software packages, patches, agents, and other components on an image, and validate it before using it. CodeDeploy is a service that automates code deployments to EC2 instances or other compute services. It can deploy the latest version of an application to a fleet of instances, and perform health checks and rollbacks if needed.
- The developer can use EC2 Image Builder to create an AMI, and install the latest version of the application and all the patches and agents that are needed to manage and run the application on it. The developer can use a pipeline in EC2 Image Builder to define the source image, components, tests, distribution settings, and output AMI for the image creation process. The developer can also configure automatic updates for the AMI whenever there are new patches or agents available. The developer can then update the Auto Scaling group launch configuration to use the AMI, so that new instances will launch with the customized image.
- The developer can then set up CodeDeploy to deploy the most recent version of the application at runtime. The developer can use an application specification file (AppSpec file) to define how CodeDeploy will deploy the application files and run scripts on each instance. The developer can also use a deployment group in CodeDeploy to specify which instances will receive the deployment, and what deployment configuration and type will be used. The developer can then trigger a deployment by uploading a revision (a bundled set of application files) to an S3 bucket or a GitHub repository.
- This solution will meet the requirements because it will decrease the time that elapses before an EC2 instance becomes available, as it will reduce the amount of work that needs to be done by the UserData script. It will also ensure that the most recent version of the application is available at all times, as it will install it on the AMI and deploy it at runtime using CodeDeploy. It will also apply all security updates, as it will install them on the AMI using EC2 Image Builder. It will also minimize the number of images that are created, as it will use one AMI for all instances in the Auto Scaling group. It will also validate the images, as it will use tests in EC2 Image Builder.
Therefore, option B and C are the correct steps that will meet these requirements with the least management overhead. Option A is incorrect because it will not ensure that the most recent version of the application is available at all times, as it will not install it on the AMI. Option D is incorrect because it will not decrease the time that elapses before an EC2 instance becomes available, as it will not reduce the work done by the UserData script. Option E is incorrect because it will not apply all security updates, as it will remove operating system patching from the UserData script.
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