What is causing this error?

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In: SOA-C01
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With: 1 Comment
A SysOps Administrator has written an AWS Lambda function to launch new Amazon EC2 instances and deployed it in the us-east-1 region.The Administrator tested it by launching a new t2.nano instance in the us-east-1 region and it performed as expected.However, when the region name was updated in the Lambda function to launch an EC2 instance in the us-west-1 region, it failed.

What is causing this error?

The AMI ID must be updated for the us-west-1 region in the Lambda function as well

The Lambda function can only launch EC2 instances in the same region where it is deployed

The Lambda function does not have the necessary IAM permission to launch more than one EC2 instance

The instance type defined in the Lambda function is not available in the us-west-1 region

Explanations:

The AMI ID is region-specific, so when launching an EC2 instance in the us-west-1 region, the Lambda function must reference a valid AMI ID for that region.

AWS Lambda functions can launch EC2 instances in any region, regardless of where the Lambda function is deployed.

The Lambda function does not require special IAM permissions to launch more than one EC2 instance; it needs permission to launch EC2 instances in the first place.

The t2.nano instance type is available in the us-west-1 region, so this is not the cause of the failure.

2025-09-28

1 Comment

  1. Laura
    Author

    I estimate that the answer is:
    The AMI ID must be updated for the us-west-1 region in the Lambda function as well

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