A developer is configuring a rolling update deployment for an application hosted on an Ama… — AWS Certified Developer - Associate

A developer is configuring a rolling update deployment for an application hosted on an Amazon Elastic Container Service (Amazon ECS) cluster using the EC2 launch type. The service runs with a desired task count of $4$ . Due to strict memory constraints on the container instances, the cluster cannot run more than $6$ tasks simultaneously. Additionally, the application must maintain at least $50\%$ of its desired capacity ( $2$ tasks) at all times to handle incoming baseline traffic.

Which two parameters should the developer configure in the ECS service definition to meet these requirements? (Select TWO.)

Set `minimumHealthyPercent` to $50$ .Answer
Set `maximumPercent` to $150$ .Answer
C
Set `minimumHealthyPercent` to $100$ .
D
Set `maximumPercent` to $100$ .
E
Set `minimumHealthyPercent` to $25$ .

Answer

Setting the minimum healthy percent to

50

and the maximum percent to

150

in the ECS service definition deployment configuration.

To satisfy the requirements, the developer must configure the deployment parameters of the ECS service relative to the desired task count of

4

. The minimum healthy percent represents the lower limit of healthy tasks that must remain running during a deployment, calculated as

\frac{2}{4} \times 100\% = 50\%

. The maximum percent represents the upper limit of tasks that can be running, calculated as

\frac{6}{4} \times 100\% = 150\%

. Together, these parameters allow the ECS service to perform a rolling update by launching up to

2

new tasks before terminating old ones, while never dropping below

2

active tasks or exceeding

6

total tasks.

Step-by-Step Solution

Calculate the required minimum healthy percent from the capacity constraint.

The minimum required active capacity is

2

tasks out of a desired count of

4

. Expressed as a percentage:

\frac{2}{4} \times 100\% = 50\%

. Therefore, the minimum healthy percent must be set to

50

This guarantees that ECS will not terminate tasks below the

50\%

threshold (

2

tasks) during the rolling update.

Calculate the required maximum percent from the resource constraints.

The maximum allowed concurrent capacity is

6

tasks out of a desired count of

4

. Expressed as a percentage:

\frac{6}{4} \times 100\% = 150\%

. Therefore, the maximum percent must be set to

150

This configuration allows ECS to start up to

2

new tasks of the new version before terminating any old tasks, while ensuring the cluster memory limit is not exceeded.

Key Concept

Amazon ECS Rolling Update Deployment Parameters

Estimated Time:1m 30s

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