# ownCloud Server Administration Manual

# Configuring Federated Cloud Sharing

In ownCloud 7 this was called server-to-server sharing. Now it is called federated cloud sharing. With just a few clicks you can easily and securely link file shares between ownCloud servers, in effect creating a cloud of ownClouds. You can automatically send an email notification when you create the share, share directly with users on other ownCloud servers, add password protection, allow users to upload files, and set an expiration date.

Note

Currently, federated shares cannot be re-shared, and the only visible option when you create the share is Can edit.

Follow these steps to create a new federated cloud share:

1. Go to your ownCloud Admin page and scroll to the Federated Cloud Sharing section of the Sharing section.

2. Check `Allow other users on this server to send shares to other servers` and `Allow users on this server to receive shares from other servers.` Leaving the checkboxes blank disables federated cloud sharing.

3. In the Sharing section, check `Allow users to share via link` and `Allow users to send mail notification for shared files`.

4. Now you and your users can go to your Files pages to create a new federated cloud share. Click the Share icon on the file or directory you want to share to expose your first sharing option.

This dialog allows you to create local shares with users and groups on your local ownCloud server, and also to create federated cloud shares with users on remote ownCloud servers by typing a link to the remote server in the form of `<user>@<link-to-owncloud>`. In this screenshot the remote ownCloud server is on the local network, so the URL form is `user@hostname/owncloud`, or `layla@remote-server/owncloud` in the example. The URL you type is echoed by the form, and labeled as `(remote)`.

Press the return key, and then wait for the link to be established. You’ll see a status message while it is working.

When the remote server has been successully contacted you’ll see a confirmation.

The link is created when your remote user confirms the share by clicking the Add remote share button.

You can return to the share dialog any time to see a list of everyone you have shared with, and federated cloud shares are labeled as `(remote)`.

Click the trash can icon to disconnect the share.

## Creating Federated Cloud Shares via Email

Check the `Share Link` checkbox to expose more sharing options (which are described more fully in File Sharing). You may create a federated cloud share by allowing ownCloud to create the link for you, and then email it to the person you want to create the share with.

You may optionally set a password and expiration date on it. When your recipient receives your email they must click the link, or copy it to a Web browser. They will see a page displaying a thumbnail of the file, with a button to Add to your ownCloud.

Your recipient should click the Add to your ownCloud button. On the next screen your recipient needs to enter the URL to their ownCloud server, and then press the return key.

Your recipient has to take one more step, and that is to confirm creating the federated cloud share link by clicking the Add remote share button.

Un-check the `Share Link` checkbox to disable any federated cloud share created this way.

## Configuration Tips

The Sharing section on your Admin page allows you to control how your users manage federated cloud shares:

- Check `Enforce password protection` to require passwords on link shares.
- Check `Set default expiration date` to require an expiration date on link shares.
- Check `Allow public uploads` to allow two-way file sharing.

Your Apache Web server must have `mod_rewrite` enabled, and you must have `trusted_domains` correctly configured in `config.php` to allow external connections (see Installation Wizard). Consider also enabling SSL to encrypt all traffic between your servers .

Your ownCloud server creates the share link from the URL that you used to log into the server, so make sure that you log into your server using a URL that is accessible to your users. For example, if you log in via its LAN IP address, such as `http://192.168.10.50`, then your share URL will be something like `http://192.168.10.50/owncloud/index.php/s/jWfCfTVztGlWTJe`, which is not accessible outside of your LAN. This also applies to using the server name; for access outside of your LAN you need to use a fully-qualified domain name such as `http://myserver.example.com`, rather than `http://myserver`.