How can i use tmpfs with AWS Lambda?

Question

i have a API that is very IO sensitive, that i want to host using AWS Lambda. I can package the data for this app with my container image, but when the lambda is invoked for the first time, i want to copy this data to tmpfs and server my request from there.

I know this makes my cold boot times horrible. But i dont really care about those. I want responsiveness, because the requests always will come in bulk

The usual workflow, if i were to set this up in an EC2 is to mount a local directory as tmpfs. and then copy files there with a userdata script.

Can someone show me how to do that in Lambda.

I cannot for instance mount any tmpfs file system at boot.

Answer

The `/tmp` directory on each Lambda function is private to that function - so your cold boot code would need to copy the files to that directory on first boot. By default, Lambda supports 512 MB of temporary storage but [that can be increased](https://aws.amazon.com/blogs/aws/aws-lambda-now-supports-up-to-10-gb-ephemeral-storage/).

If you wanted to store the files externally, consider using [EFS with your Lambda function](https://aws.amazon.com/blogs/compute/using-amazon-efs-for-aws-lambda-in-your-serverless-applications/).

How can i use tmpfs with AWS Lambda?

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