How can the application be deployed on new EC2 instances?
Launch a script that downloads and installs the application using Amazon EC2 user data.
Create a custom API using Amazon API Gateway to call an installation executable from an AWS CloudFormation template.
Use AWS Systems Manager to inject the application into an AMI.
Configure AWS CodePipeline to deploy code changes and updates.
Explanations:
Using Amazon EC2 user data allows for scripts to run at the instance’s launch, enabling automatic download and installation of the application. This method is efficient for deploying small applications that require frequent updates on new EC2 instances.
Creating a custom API with Amazon API Gateway to call an installation executable involves more complexity and is not the most straightforward approach for installing an application on EC2 instances. It also adds latency and dependency on API calls rather than directly using user data.
AWS Systems Manager can help manage and deploy applications, but injecting the application into an AMI is a more static approach. This does not address the need for frequent updates effectively, as each new version would require creating a new AMI.
AWS CodePipeline is primarily for CI/CD processes and is not directly responsible for the installation of applications on EC2 instances. While it can be used to deploy updates, it does not simplify the initial installation process on new instances.
In my experience, the answer is:
Launch a script that downloads and installs the application using Amazon EC2 user data.