Exam AWS-SysOps topic 1 question 686 discussion

I Think A - the question says 'How can the application be deployed on new EC2 instances?',not existing.

A: Correct (A way to Install apps on new EC2 instances) B: Complicated and Out of scope C: SSM can be used to patch exiting AMIs or injecting apps into EC2 instances, not AMIs (I think) D: Codepipeline deploy code changes and updates to existing EC2 instances using CodeDeploy or AWS Elastic Beanstalk. We are more looking at installing the app on a new EC2 instance which why I would rather choose A as an answer.

Using Amazon EC2 user data is a simple and efficient way to install a small and frequently updated application during the instance boot process. User data scripts run when the instance launches, and they can include commands to download and install applications automatically.

Almost no one address the 'update frequently ' part of the question, only D can do it automatically, both install and update

A - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/user-data.html The application is self sustaining ie no intervention needed post install, but pre-install, user data can be used.

The question is stating new EC2 instances so A is the best

I believe D is better than A because question Say that application is *updated frequently* .. yes question mention it's a new instance but that doesn't prevent us from using code deploy after New instance is initialized .

D would be the only logical answer here.

1. EC2 instances are already deployed(leaves A and D). 2. When efficiency or cost isn't mentioned AWS defaults to looking for the lowest cost. Codepipeline is $1 per pipeline every 30 days. C mentions injecting the code into the AMI. The AMI has to be deployed, updated and recreated. This doesn't help the existing deployed instances. I go with A.

TRICK QUESTION: "How can the application be deployed on new EC2 instances?" Answer is A. Launch a script that downloads and installs the application using the Amazon EC2 user data.

is request is for New EC2 answer should be A

A. Launch a script that downloads and installs the application using the Amazon EC2 user data.

I agree that A can be used for installing instances. However, there is another question. Can D also be used for installing instances? That's what I am wondering...

i Think it should be C --> You can use the AWS Management Console or the AWS CLI to deploy packages to your AWS Systems Manager managed instances by using AWS Systems Manager Distributor. You can currently deploy one version of one package per command. You can install new packages or update existing installations in place. You can choose to deploy a specific version or choose to always deploy the latest version of a package for deployment. We recommend using State Manager to install packages. Using State Manager helps ensure that your instances are always running the most up-to-date version of your package.

Isn't user data loaded at instance reboot? If so, for change to take effect every time, an instance reboot will be needed. Otherwise, https://aws.amazon.com/codepipeline/?nc=sn&loc=1, the benefit of CodePipeline "AWS CodePipeline is a fully managed continuous delivery service that helps you automate your release pipelines for fast and reliable application and infrastructure updates. CodePipeline automates the build, test, and deploy phases of your release process every time there is a code change, based on the release model you define. "

OK I take my answer back. It is installing user data and consequently A is the correct answer.

I would go with C. We could use System manager to do this