CODEWITHSUNDEEP
amazon-web-servicesamazon-ec2metadataaws-lambda
Naveen Vijay
Naveen Vijay

Reputation: 16532

AWS Lambda Meta-Data like EC2 Meta-Data for lambda

AWS EC2 Meta-Data provides the necessary information about itself from EC2 (duh!) - is there anything equivalent for lambda.

I understand the multi-tenancy and short-lived behavior of the lambda function unlike EC2 but essential info like Account ID, VPC AZ, Region would help do a lot of AWS automation.

Upvotes: 6

Views: 7876

Answers (3)

Andrew Rau
Andrew Rau

Reputation: 41

In the context object of the Lambda, you can parse out some of the information you're looking for in the invoked_function_arn.

For example in Python: context.split(':')[3] will give you the region and context.split(':')[4] will give you the aws account id and context.split(':')[6] will give you the function name (which is also available in context.function_name

The invoked_function_arn looks like the following:

arn:aws:lambda:us-east-1:741063561123:function:lambda_context

Once you have that information you can use aws libraries (e.g. boto3 for Python) to get the rest of the information about the lambda (such as VPC, SG)

Upvotes: 1

Victor Sergienko
Victor Sergienko

Reputation: 13495

You can set an environment variable when you deploy the lambda: https://docs.aws.amazon.com/lambda/latest/dg/env_variables.html

There are already AWS_REGION and AWS_DEFAULT_REGION variables there: https://docs.aws.amazon.com/lambda/latest/dg/current-supported-versions.html#lambda-environment-variables.

event can have fields like requestContext.accountId: https://docs.aws.amazon.com/lambda/latest/dg/eventsources.html?shortFooter=true#eventsources-api-gateway-request

Found this out when browsing Terraform's lambda_function configuration.

Upvotes: 3

Karen B
Karen B

Reputation: 2761

No, unfortunately not. The context object is the closest thing, but the information it offers is very limited. http://docs.aws.amazon.com/lambda/latest/dg/programming-model-v2.html

If you're invoking the lambda functions yourself or in a programmatic way, you could pass the account ID and region in the payload.

Upvotes: 3

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