An administrator is configuring a rolling update deployment for an Amazon Elastic Containe… — AWS Certified SysOps Administrator - Associate

An administrator is configuring a rolling update deployment for an Amazon Elastic Container Service (Amazon ECS) service that has a desired task count of $4$ . The deployment must guarantee that the service capacity does not drop below $4$ healthy tasks at any time, but it can scale up to $8$ tasks during the update process. Which deployment configuration parameters should the administrator specify to meet these requirements?

A
Minimum healthy percent: $50\%$ , Maximum percent: $150\%$
B
Minimum healthy percent: $100\%$ , Maximum percent: $100\%$
Minimum healthy percent: $100\%$ , Maximum percent: $200\%$ Answer
D
Minimum healthy percent: $0\%$ , Maximum percent: $100\%$

Answer

Minimum healthy percent:

100\%

, Maximum percent:

200\%

Specifying a minimum healthy percent of

100\%

ensures that the service maintains all

4

tasks (

100\%

of the desired count) at all times. Setting the maximum percent to

200\%

permits the deployment to provision up to

8

tasks (

200\%

of the desired count) temporarily. This allows the new task definitions to run alongside the old ones and pass health checks before the old tasks are drained and terminated.

Step-by-Step Solution

Determine the required minimum healthy percent configuration.

Minimum healthy percent must be set to

100\%

Since the desired task count is

4

, and the capacity must not drop below

4

healthy tasks during the update, the ratio of healthy tasks to desired tasks is

\frac{4}{4} = 100\%

Determine the required maximum percent configuration.

Maximum percent must be set to

200\%

Since the service is allowed to scale up to

8

tasks during the update, the ratio of maximum allowed tasks to desired tasks is

\frac{8}{4} = 200\%

Combine the parameters to define the deployment configuration.

The final parameters are a minimum healthy percent of

100\%

and a maximum percent of

200\%

This specific combination ensures that the new task versions are deployed and verified as healthy before the old task versions are stopped, resulting in a zero-downtime rolling update.

Key Concept

Amazon ECS rolling update deployment configuration utilizing minimum healthy percent and maximum percent parameters.

Question

Answer

Step-by-Step Solution

Key Concept

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