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Home Forums AWS AWS Certified Solutions Architect Associate Understanding ASG behaviour

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  • Understanding ASG behaviour

  • Rumman

    Member
    December 12, 2020 at 6:59 am

    For the question

    A company needs to deploy at least 2 EC2 instances to support the normal workloads of

    its application and automatically scale up to 6 EC2 instances to handle the peak load.

    The architecture must be highly available and fault-tolerant as it is processing mission-critical

    workloads.

    As the Solutions Architect of the company, what should you do to meet the above

    requirement?

    The option that says: Create an Auto Scaling group of EC2 instances and set the

    minimum capacity to 2 and the maximum capacity to 6. Use 2 Availability Zones and

    deploy 1 instance for each AZ is incorrect because if an AZ outage occurred, there will

    only be 1 running instance left. The scenario requires you to run at least 2 EC2 instances

    to support the workload of their application.

    But I am wondering if one of the AZ is gone why can’t ASG not been able to spin up two instances in the other AZ as we set a minimum cap to 2?

  • Gerome-TutorialsDojo

    Member
    December 14, 2020 at 7:54 pm

    Hello Rumman,

    Thanks for the feedback.

    But I am wondering if one of the AZ is gone why can’t ASG not been able to spin up two instances in the other AZ as we set a minimum cap to 2?

    — There is a statement in the scenario “processing mission-critical workloads” this means that there shouldn’t be a downtime. If you would recreate this option in the AWS Management Console, it takes a few minutes before ASG can spin up another instance in the remaining AZ. Therefore, if you need to run at least 2 EC2 instances to process mission-critical workloads, you must deploy 2 instances in each AZ. If there is an AZ outage, you would still have 2 instances running.

    Let us know if you need further assistance. The Tutorials Dojo team is dedicated to helping you pass your AWS exam on your first try!

    Regards,

    Gerome @ Tutorials Dojo

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