Mounting an Amazon EFS (Elastic File System) in the CodeBuild runner on the fly might be useful if you need to persist data across builds, run integration tests if the file system is used across multiple services, or manage large files efficiently.
In this guide, the steps to mount an EFS on a CodeBuild ephemeral host in a different VPC are explained.
The prerequisites for mounting an EFS in CodeBuild include having access to the CodeBuild runner, configuring the CodeBuild project inside a VPC, connecting the VPCs, ensuring both VPCs are in the same region, running the CodeBuild project in privileged mode, and having the AWS CLI properly configured.
The process involves configuring the EFS, mounting the EFS, and testing the EFS to ensure successful execution of the setup.