Prepare AWS Certified Solutions Architect - Associate exam with 390 unique high-quality test questions with explanations
Are you aiming to become an AWS Certified Solutions Architect - Associate? Our comprehensive practice test course is designed to help you succeed. This six practice exams course offers 390 unique, high-quality test questions with detailed explanations, ensuring you thoroughly understand all the domains covered in the exam. Whether you're a beginner or an experienced professional looking to validate your skills, these practice tests will help you identify your strengths and areas for improvement, build your confidence, and increase your chances of passing the certification exam on your first attempt. Prepare effectively and efficiently with our targeted practice questions and detailed explanations, and take a significant step toward achieving your AWS certification goals.
We recommend re-taking these practice tests until you consistently score 80% or higher - that’s when you’re ready to take the exam and achieve an excellent score!
Sample Question:
Your company’s software engineering group has developed a SaaS-based application. For the software to deploy into production so that your users start using it, you need to set up an EC2 Auto Scaling group by fronting it with an Application Load Balancer. Based on the company policy, you must ensure that each launched EC2 instance of the Auto Scaling group must have licensed security software installed as a scale-out event happens. Which of the following options is correct for this use case?
Use EC2 Instance User Data to put the instance into a wait state and install the licensed security software.
Use EC2 Instance Meta Data to put the instance into a wait state, then install the licensed security software.
Use the Auto Scaling group scheduled action to put the EC2 instance into a wait instance to install the licensed security software.
Use the Auto Scaling group Lifecycle hook to put the instance into a wait state to install the licensed security software.
Correct answer: Use the Auto Scaling group Lifecycle hook to put the instance into a wait state to install the licensed security software. Using the Auto Scaling group Lifecycle hook to put the instance into a wait state to install the licensed security software is the correct option for this use case. A Lifecycle hook allows you to perform custom actions before an instance is launched or terminated in an Auto Scaling group. By using a Lifecycle hook, you can ensure that the licensed security software is installed on each launched EC2 instance as part of the scale-out event.
Overall explanation
In this scenario, the requirement is to ensure that each EC2 instance launched by an Auto Scaling group has licensed security software installed before it becomes operational. This can be effectively achieved using Auto Scaling group lifecycle hooks. Here’s a detailed explanation:
Lifecycle Hooks
Lifecycle hooks enable you to perform custom actions as the Auto Scaling group launches or terminates instances. By using lifecycle hooks, you can control what happens when an instance transitions from one state to another.
How Lifecycle Hooks Work:
Transition States: Lifecycle hooks apply during specific transitions. For launching instances, the transition is from Pending to InService.
Wait State: When a lifecycle hook is triggered, the instance enters a wait state (Pending:Wait for launches). This wait state allows you to perform the necessary actions, such as installing software.
Actions During Wait State: You can run a script to install the licensed security software during the wait state.
Completion: Once the installation is complete, you signal to the Auto Scaling group that the instance is ready to move to the InService state.
Steps to Implement Lifecycle Hooks:
Define a Lifecycle Hook: Create a lifecycle hook for the Auto Scaling group that triggers when an instance launches.
Install Software: Use the lifecycle hook to invoke a script or Lambda function that installs the security software.
Complete the Lifecycle Action: Signal the completion of the lifecycle hook action to move the instance from Pending:Wait to InService.
Incorrect Answer Explanation
Use EC2 Instance User Data to put the instance into a wait state and install the licensed security software. Using EC2 Instance User Data to put the instance into a wait state and install the licensed security software is not a suitable option for this use case. EC2 Instance User Data is typically used for running scripts or commands during the instance launch process, not for handling scale-out events and installing software.
Use EC2 Instance Meta Data to put the instance into a wait state, then install the licensed security software. Using EC2 Instance Meta Data to put the instance into a wait state and then install the licensed security software is not the correct approach for this use case. EC2 Instance Meta Data provides information about the instance itself, such as instance type, IP address, etc., and is not used for controlling the instance state or software installation.
Use the Auto Scaling group scheduled action to put the EC2 instance into a wait instance to install the licensed security software. Using the Auto Scaling group scheduled action to put the EC2 instance into a wait state to install the licensed security software is not the recommended approach for this use case. Scheduled actions are typically used for predefined scaling activities at specific times, not for handling scale-out events and software installation.
Resources
AWS Auto Scaling Lifecycle Hooks
Amazon EC2 Auto Scaling User Guide
AWS EC2 Instance Lifecycle
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