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AWS Practical UseCase  : A web-startup runs its very successful social news application on Amazon EC2 with an Elastic Load Balancer, an Auto-Scaling group of Java/Tomcat application-servers, and DynamoDB as data store. The main web-application best runs on m2 x large instances since it is highly memory- bound Each new deployment requires semi-automated creation and testing of a new AMI for the application servers which takes quite a while ana is therefore only done once per week.

Recently, a new chat feature has been implemented in nodejs and wails to be integrated in the architecture. First tests show that the new component is CPU bound Because the company has some experience with using Chef, they decided to streamline the deployment process and use AWS Ops Works as an application life cycle tool to simplify management of the application and reduce the deployment cycles.

What configuration in AWS Ops Works is necessary to integrate the new chat module in the most cost-efficient and flexible way?

 

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Comments  

0 # Ashok Kumar 2015-11-17 07:02
Answer : A
0 # Test@AWS 2015-11-30 18:39
A seems to be wrong because, there are two layers involved at least Java Layer and NodeJs Layer
0 # Yuxin Liu 2016-01-03 03:16
I do not think there is a right answer.
The chat is a new feature of the application, so it should be in the same stack with the application.
There should be an ELB layer, a tomacat layer, a DynamoDB layer and a Node.js layer. DynamoDB is not a standard option, so it need a custom recipe. The tomcat application requires "semi-automate creation and testing of a new AMI", so I think it cannot use standard installation, need to create a custom recipe.

In summary, we need 1 stack, 4 layers, 2 custom recipes.
0 # yuxin liu 2016-01-03 03:27
I do not think there is a right answer.
My answer is 1 stack, 4 layers, 2 custom recipes.

The chat(node.js application) is a new feature, so it should be in the same stack with the application.

The 4 laysers should be: ELB layer, java/tomcat layer, Node.js layer and DynamoDB layer.

2 recipes are: DynamoDB and java.tomcat. DynamoDB is not a standard option in opsworks, so it needs a custom recipe.
"The main web-application best runs on m2 x large instances since it is highly memory- bound Each new deployment requires semi-automated creation and testing of a new AMI for the application servers which takes quite a while ana is therefore only done once per week." This means we cannot use standard installation, we need to create a custom recipe.
0 # Nalini P 2016-03-15 05:47
C
+1 # Laurentiu V 2016-03-23 23:02
B

One stack - we have one application
two layers - tomcat and node.js
one recipe - node.js
0 # Alok A S 2016-05-10 02:29
Hi,

Should it not be "C"

2 Stacks as one set will be compute optimized and the other be meory optimized - agree with all of the others

Quoting Laurentiu V:
B

One stack - we have one application
two layers - tomcat and node.js
one recipe - node.js
0 # K 2016-04-18 06:42
Why not C or D ?

I think they need to test the chat system as well - "testing of a new AMI for the application ". As per AWS OpsWorks - "A common practice is to have multiple stacks that represent different environments."

So there should be testing environment and production. Why only one recipe and why not two recipes ?