Set Up the Guest Feature

The Guest Feature allows users to share files and folders with external people by email address. The invited guest receives an email with a personal link and can access the shared content in the web browser without an OpenCloud account.

This guide explains how to enable the Guest Feature in a deployment based on the opencloud-compose deployment example.

hinweis

The Guest Feature is disabled by default. It requires OpenCloud version 9.0.0 or later and a working email configuration.

How the Guest Feature Works

The Guest Feature is provided by the auth-guest service.

• When a user shares a file or folder with an external email address, the auth-guest service creates a one-time invitation link.
• The notifications service sends the invitation link to the guest by email.
• When the guest opens the link, OpenCloud verifies it and creates a guest session in the browser.
• The guest can access only the shared file or folder, with the permissions assigned by the sharing user.

Setting	Default
Validity of the invitation link	30 minutes, single use (not configurable)
Lifetime of a guest session	24 hours (AUTH_GUEST_JWT_TTL)

Prerequisites

• A running OpenCloud deployment based on opencloud-compose.
• OpenCloud version 9.0.0 or later.
• A working SMTP configuration for sending invitation emails.

If you are running an older OpenCloud version, follow the Standard Upgrade Guide and the Upgrade 9.x.x guide before enabling the Guest Feature.

important

Before upgrading, check whether a version-specific upgrade guide is available for your target version. These guides may contain additional migration steps, configuration changes, or breaking changes that must be considered.

To configure email delivery, follow the Mail Notifications guide. Make sure that the notifications service is enabled.

All commands in this guide are run in the root directory of the opencloud-compose deployment.

Check the Service Account Configuration

The auth-guest service requires a service account. Without it, the service does not start and the OpenCloud container keeps restarting.

Check whether your OpenCloud configuration contains the service account settings for the auth-guest service:

docker compose exec opencloud grep -A3 "auth_guest:" /etc/opencloud/opencloud.yaml

• New installations of OpenCloud 9.0.0 or later: The output shows the service_account settings. They are created automatically during the initial setup. No further action is required.
• Installations upgraded from an earlier version: If there is no output, migrate the configuration as described in the Upgrade 9.x.x guide before you continue.

Enable the Guest Feature

Enable the Guest Feature in the .env file of your opencloud-compose deployment:

nano .env

Add or update the following setting:

OC_ENABLE_GUEST_LINKS=true

hinweis

The current opencloud-compose setup passes OC_ENABLE_GUEST_LINKS from the .env file to the OpenCloud container. If you use an older checkout, update opencloud-compose before enabling the feature.

Restart OpenCloud

Apply the changes:

docker compose up -d

Verify the Configuration

Check that the OpenCloud container is running:

docker compose ps opencloud

The status must be Up. If the status is Restarting, see Troubleshooting.

Check that the Guest Feature is enabled:

docker compose exec opencloud printenv OC_ENABLE_GUEST_LINKS

The output must be true.

Check that the notifications service is enabled:

docker compose exec opencloud printenv OC_ADD_RUN_SERVICES

The output must contain notifications.

Finally, test the Guest Feature in the web interface:

1. Share a file or folder with an external email address.
2. Select the recipient marked (Guest).
3. Click Share.
4. Verify that the guest receives an invitation email and can access the shared content.

Optional Settings

You can adjust the behavior of the Guest Feature with additional environment variables. The standard opencloud-compose file does not pass the service-specific AUTH_GUEST_* variables from .env to the container. To configure them, create a separate Compose file:

mkdir -p custom
nano custom/guest.yml

Add only the settings that you want to change, for example:

services:
  opencloud:
    environment:
      AUTH_GUEST_JWT_TTL: '12h'

Append custom/guest.yml to the existing COMPOSE_FILE value in .env. Keep all Compose files that are already part of your deployment.

Variable	Default	Description
AUTH_GUEST_JWT_TTL	24h	Lifetime of a guest session.
AUTH_GUEST_PIN_AND_NONCE_TTL	30m	Lifetime of the one-time PIN used to renew guest access.
AUTH_GUEST_BACKOFF_MAX_ATTEMPTS	5	Number of failed PIN attempts before the PIN is invalidated.
AUTH_GUEST_QUOTA_COOLDOWN	1m	Minimum time between two renewals without a valid session for the same share.
AUTH_GUEST_QUOTA_DAILY_CAP	50	Maximum number of renewals without a valid session per share within the quota window.

For a complete list of settings, see the auth-guest environment variables in the developer documentation.

Troubleshooting

The OpenCloud Container Keeps Restarting

Check the logs:

docker compose logs --tail=40 opencloud

If the log contains guestlinks: service_account_id must not be empty, the service account settings for the auth-guest service are missing in the OpenCloud configuration. Migrate the configuration as described in Check the Service Account Configuration.

Sharing with a Guest Fails

If users see the message Failed to add share when they share with a guest:

• Make sure that you are running OpenCloud version 9.0.0 or later.

• Verify that OC_ENABLE_GUEST_LINKS is set to true inside the container:

  docker compose exec opencloud printenv OC_ENABLE_GUEST_LINKS

  If there is no output, make sure that .env contains an active OC_ENABLE_GUEST_LINKS=true line and that your opencloud-compose checkout is up to date. Then recreate the OpenCloud container with docker compose up -d.

Guests Do Not Receive an Email

Check the log of the notifications service:

docker compose logs opencloud | grep '"service":"notifications"' | tail -10

Make sure that the notifications service is enabled and that your SMTP configuration is working. See Mail Notifications for configuration details and troubleshooting.

After fixing email delivery, remove the guest share and invite the guest again to create a new invitation.