AWS Lambda now supports integration with Amazon Elastic File System (EFS), enabling persistent file storage beyond the default 512MB /tmp disk space. Initially, EFS was only available for Amazon EC2 instances, but AWS has expanded its compatibility to various compute offerings like EKS, ECS, and Fargate, and now Lambda. This integration allows serverless functions to easily access network file systems, facilitating scenarios where more disk space is required or where persistent storage needs to be shared across multiple functions or compute services. Using Pulumi, developers can provision the necessary infrastructure to integrate EFS with Lambda, including setting up a Virtual Private Cloud (VPC), EFS file systems, and mount targets. The post demonstrates building an application that utilizes API Gateway to interact with the EFS file system via Lambda functions, enabling file operations like GET and POST without needing the AWS SDK. Furthermore, it explains how to share the EFS file system with other compute services, such as running an Nginx server on Fargate that serves content directly from EFS. This development enhances data management capabilities within serverless environments and offers seamless data sharing with traditional compute resources.