Which recommendations can help ensure load-testing HTTP requests are evenly distributed across the four webservers?

A startup s photo-sharing site is deployed in a VPC. An ELB distributes web traffic across
two subnets. ELB session stickiness is configured to use the AWS-generated session
cookie, with a session TTL of 5 minutes. The webserver Auto Scaling Group is configured
as: min-size=4, max-size=4. The startups preparing for a public launch, by running
load-testing software installed on a single EC2 instance running in us-west-2a. After 60
minutes of load-testing, the webserver logs show: Which recommendations can help ensure
load-testing HTTP requests are evenly distributed across the four webservers? Choose 2
answers.

A.
Re-configure the load-testing software to re-resolve DNS for each web request.

B.
Use a 3rd-party load-testing service which offers globally-distributed test clients.

C.
Configure ELB and Auto Scaling to distribute across us-west-2a and us-west-2c.

D.
Configure ELB session stickiness to use the app-specific session cookie.

E.
Launch and run the load-tester EC2 instance from us-east-1 instead.

Discussion

4 Responses to “Which recommendations can help ensure load-testing HTTP requests are evenly distributed across the four webservers?”

  1. raysmithvic1978 says:

    A,B

  2. Greg says:

    B and D
    A is wrong because the ELB is directing the traffic
    B would bypass stickyness
    C is silly
    D would apply the 5 minute TTL of the application session
    E is also silly

    • Greg says:

      I mis-read this one. it is A and B. If session Stickeness of the ELB Cookie TTL was set to 60 minutes and the App cookie session TTL was set to a lower number (5 minutes) then A would be Trumped, however, since the ELB cookie is already set to 5 minutes and the test is 60 minutes long then A and B would work and are the simplest choices.

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