[Solved] Given this event pattern in a CloudWatch Events rule JSON:{"source": ["aws.ec2"], "detail-type": ["EC2 Instance State-change Notification"], "detail": {"state":... | AWS

AWS - CloudWatch

Given this event pattern in a CloudWatch Events rule JSON:

{"source": ["aws.ec2"], "detail-type": ["EC2 Instance State-change Notification"], "detail": {"state": ["running"]}}

What event will trigger this rule?

AAny EC2 instance state change

BEC2 instance starting to run

CEC2 instance stopping

DAny AWS service event

Step-by-Step Solution

Solution:

Step 1: Analyze the event pattern fields
The pattern filters events from source "aws.ec2" with detail-type "EC2 Instance State-change Notification" and state "running".
Step 2: Interpret the state filter
The rule triggers only when an EC2 instance changes state to "running" (starts).
Final Answer:
EC2 instance starting to run -> Option B
Quick Check:
State filter "running" = triggers on start [OK]

Quick Trick: State "running" means instance just started [OK]

Common Mistakes:

MISTAKES

Master "CloudWatch" in AWS

9 interactive learning modes - each teaches the same concept differently

More AWS Quizzes

Given this event pattern in a CloudWatch Events rule JSON: