![]() ![]() You just need to approve - when you deploy the stack, as shown in the below screenshot Security Group EFS Project ArchitectureĪs a requirement, Lambda functions which uses Elastic File System should be in VPC. If you're using aws cdk as it is mentioned in this article, AWS CDK would create this security group for EFS for you. This can be done through security group for EFS. To access EFS from Lambda(or EC2 or any client for that matter), the inbound port 2049 should be opened. You can specify the user id, group id and access permissions in standard octal format. In addition to the path, access point also defines the user who has access to the defined path. Using AWS Lambda with Elastic File System (EFS) POSIX permissions for access point Mount path is the directory at the client end (lambda in our case) using which you can use the access point at the EFS end.īelow is the pictorial representation of the same. You don't want lambda to have any access (read, write or execute permissions) to any other directory in EFS. For example, you can have a lambda function which writes some files to EFS and you want this lambda to be restricted only to reading/writing to this specific directory. It is a directory at elastic file system for which client(lambda in our case) has access to. Access point & Mount PathĪccess point is application specific entry point to the elastic file system. Of course, you can create multiple directories in EFS later, as you wish. ![]() When Elastic File System is created, root directory / and root user (UID 0) with read, write and execute permissions will be available, by default. How Elastic File System (EFS) works with Lambda In these cases, you can use EFS which is a serverless, elastic file system which grows and shrinks as you add or remove files.Įlastic File System would also be a better fit, if you want durable file system which may be used by other services in your application ecosystem. Please note that /tmp is a ephemeral storage - meaning that you may lose your data between different lambda function invocations and you'll not be able to share the data stored here across different lambda function invocations. Recently Lambda has increased the size of ephemeral storage of /tmp folder to 10GB (earlier it was just 512 MB). You may think of writing to /tmp folder and it has decent storage space of 10GB. Some lambda functions will be writing files and other lambda functions will be reading the same files for further processing or to store metadata in database. In this application, you might have to write some large files and you've to share these large files between lambda functions. Let's consider a scenario where you're building serverless video processing application. Why would you use Elastic File System (EFS) with AWS Lambda Technically, EFS is an implementation of Network File System. Introduction to AWS Lambda and EFSĪWS Lambda is a serverless, event-driven compute service which lets you run your code without having to provision servers.ĪWS Elastic File System(EFS) is a file system which automatically grows and shrinks as you add and remove files. You can learn more about AWS CDK from a beginner's guide here. Of course, you need to have an AWS account to create AWS resources. Only basic knowledge of CDK and TypeScript is required for trying this tutorial. When deploying (using the cdk deploy command), your code is converted to Cloudformation templates, and all the corresponding AWS resources are created. We're going to use TypeScript in this tutorial. AWS CDK supports many languages including TypeScript, Python, C#, Java and others. It's an open source software development framework that lets you define cloud infrastructure. Python version for this article is available here. In this tutorial, we're going to learn about how to use Elastic File System (EFS) with AWS Lambda using Typescript. ![]() Download the free ebook on AWS Lambda here
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