You receive an error that your ECS cluster cannot place tasks due to insufficient resources, but you see many instances are registered. What is a likely cause?

medium📝 Debug Q7 of 15

AWS - ECS and Fargate

ATask definition is missing container image

BCluster name is misspelled in task definition

CInstances are in draining state and not accepting tasks

DSecurity group blocks task communication

Step-by-Step Solution

Solution:

Step 1: Understand instance states
Instances in draining state do not accept new tasks, reducing available capacity.
Step 2: Exclude unrelated causes
Misspelled cluster name causes API errors, not resource errors. Missing container image causes task start failure, not placement error. Security groups affect communication, not resource availability.
Final Answer:
Instances are in draining state and not accepting tasks -> Option C
Quick Check:
Draining instances reduce available resources [OK]

Quick Trick: Check instance states; draining means no new tasks [OK]

Common Mistakes:

Ignoring instance draining state
Confusing cluster name errors
Assuming security groups cause resource errors

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More AWS Quizzes

You receive an error that your ECS cluster cannot place tasks due to insufficient resources, but you see many instances are registered. What is a likely cause?

Step 1: Understand instance states

Step 2: Exclude unrelated causes

Final Answer:

Quick Check:

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