A company runs a containerized web application on Amazon ECS using the AWS Fargate launch … — AWS Certified Developer - Associate

A company runs a containerized web application on Amazon ECS using the AWS Fargate launch type. The ECS service is configured with a desired count of $8$ tasks. Due to strict budget constraints, the developer cannot allocate any additional Fargate tasks or capacity during a deployment. However, the application must remain online, maintaining at least $50\%$ of its desired processing capacity throughout the update process.

Which two deployment configuration values should the developer specify in the ECS service definition to meet these requirements?

`minimumHealthyPercent` set to $50$ Answer
`maximumPercent` set to $100$ Answer
C
`maximumPercent` set to $150$
D
`minimumHealthyPercent` set to $100$
E
`minimumHealthyPercent` set to $0$

Answer

Setting the minimum healthy percent to

50

and the maximum percent to

100

Specifying a `maximumPercent` of

100

and a `minimumHealthyPercent` of

50

satisfies all constraints. Setting `maximumPercent` to

100

ensures that Amazon ECS does not provision any extra Fargate tasks beyond the desired count during the deployment, adhering to the strict budget limits. Setting `minimumHealthyPercent` to

50

ensures that at least half of the tasks (

4

out of

8

) remain running and healthy during the update, maintaining the required processing capacity online.

Step-by-Step Solution

Analyze the capacity and resource constraint.

The constraint states that no additional tasks or capacity can be allocated during the deployment. Therefore, the maximum number of concurrent running or pending tasks must be capped exactly at the desired count, which is

100\%

. This determines that `maximumPercent` must be

100

Setting `maximumPercent` to

100

prevents Amazon ECS from scaling up and provisioning extra Fargate tasks during the update.

Analyze the availability constraint.

The application must maintain at least

50\%

of its processing capacity online at all times. Since the desired count is

8

tasks, at least

4

tasks must remain running and healthy. This determines that `minimumHealthyPercent` must be

50

Setting `minimumHealthyPercent` to

50

guarantees that Amazon ECS will only stop up to

4

tasks at a time, keeping the remaining

4

active to handle incoming traffic.

Key Concept

Amazon ECS Rolling Updates Configuration

Question

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Topics

More questions from this topic