Set Up ObjectiveFS With Amazon S3: IAM Role

This document covers the steps to set up your ObjectiveFS filesystem with Amazon S3 using S3 keys. For ObjectiveFS versions older than 7.0, see this doc.

Estimated time: 5 minutes

What You Need

  1. IAM role with S3 permission is attached to your EC2 instances. For S3 keys, use this guide.
  2. ObjectiveFS license key from the Filesystem section on your profile page.
  3. ObjectiveFS software installed on your machine (see Quick Start).


  1. Configure Objectivefs

    $ sudo mount.objectivefs config -i s3://
    Creating config for Amazon in /etc/objectivefs.env
    Enter ObjectiveFS license: <your ObjectiveFS license>
    Enter Default Region (optional): <your S3 region, e.g. eu-west-1>
    Note: This will get the IAM role from the AWS metadata host at

  2. Create your filesystem (one-time only)

    • Choose a unique filesystem name. ObjectiveFS will create a new bucket with this name.
    • Choose a strong passphrase, write it down and store it somewhere safe.
      IMPORTANT: Without the passphrase, there is no way to recover any files.

    $ sudo mount.objectivefs create <your filesystem name>
    Passphrase (for s3://<filesystem>): <your passphrase>
    Verify passphrase (for s3://<filesystem>): <your passphrase>

  3. Mount your filesystem
    Mount your filesystem on an existing empty directory, e.g. /ofs. The ObjectiveFS process will run in the background. The command below uses the mkdir and mt mount options.

    $ sudo mount.objectivefs -omkdir,mt <your filesystem name> /ofs
    Passphrase (for s3://<filesystem>): <your passphrase>

  4. [Optional] Multi-server setup
    Mount this filesystem on as many servers as you wish by running steps 1 and 3 on each server. Each server can read and write to the same filesystem at the same time.

If you have questions, please email us at

Last updated by ObjectiveFS staff, February 14, 2023

ObjectiveFS is a shared filesystem for Linux and macOS that automatically scales up and out with high performance. In production use by Fortune 500 companies since 2013.