Nextcloud can be set up (parameter `-i`) and removed (parameter `-p`) with the [helper script](https://github.com/mailcow/mailcow-dockerized/raw/master/helper-scripts/nextcloud.sh) included with mailcow. In order to install Nextcloud simply navigate to your mailcow-dockerized root folder and run the helper script as follows:
`./helper-scripts/nextcloud.sh -i`
In case you have forgotten the password (e.g. for admin) and can't request a new one [via the password reset link on the login screen](https://docs.nextcloud.com/server/20/admin_manual/configuration_user/reset_admin_password.html?highlight=reset) calling the helper script with `-r` as parameter allows you to set a new password. Only use this option if your Nextcloud isn't configured to use mailcow for authentication as described in the next section.
In order for mailcow to generate a a certificate for the nextcloud domain you need to add "nextcloud.domain.tld" to ADDITIONAL_SAN in mailcow.conf and run `docker-compose up -d` to apply. For more informaton refer to: [Advanced SSL](../post_installation/firststeps-ssl.md).
After adding these lines the `docker-compose up -d` command must be executed to update the docker image and also the docker scheduler image must be restarted to
pick up the new job definition by executing `docker-compose restart ofelia-mailcow`. To check if the job was successfully picked up by `ofelia` the command
`docker-compose logs ofelia-mailcow` will contain a line similar to `New job registered "nextcloud-cron" - ...`.
By adding these lines the background jobs will be executed every 5 minutes. To verify that the execution works correctly, the only way is to see it in the basic
settings when logged in as an admin in Nextcloud. If everything is correct the first scheduled execution will change the background jobs processing setting to
`(X) Cron` and the timestamp after `Last job ran` will be updated every 5 minutes.
## Configure Nextcloud to use mailcow for authentication
The following describes how set up authentication via mailcow using the OAuth2 protocol. We will only assume that you have already set up Nextcloud at _cloud.example.com_ and that your mailcow is running at _mail.example.com_. It does not matter if your Nextcloud is running on a different server, you can still use mailcow for authentication.
1\. Log into mailcow as administrator.
2\. Scroll down to _OAuth2 Apps_ and click the _Add_ button. Specify the redirect URI as `https://cloud.example.com/index.php/apps/sociallogin/custom_oauth2/Mailcow` and click _Add_. Save the client ID and secret for later.
!!! info
Some installations, including those setup using the helper script of mailcow, need to remove index.php/ from the URL to get a successful redirect: `https://cloud.example.com/apps/sociallogin/custom_oauth2/Mailcow`
3\. Log into Nextcloud as administrator.
4\. Click the button in the top right corner and select _Apps_. Click the search button in the toolbar, search for the [_Social Login_](https://apps.nextcloud.com/apps/sociallogin) plugin and click _Download and enable_ next to it.
5\. Click the button in the top right corner and select _Settings_. Scroll down to the _Administration_ section on the left and click _Social login_.
6\. Uncheck the following items:
- "Disable auto create new users"
- "Allow users to connect social logins with their accounts"
- "Do not prune not available user groups on login"
- "Automatically create groups if they do not exists"
- "Restrict login for users without mapped groups"
7\. Check the following items:
- "Prevent creating an account if the email address exists in another account"
- "Update user profile every login"
- "Disable notify admins about new users"
Click the _Save_ button.
8\. Scroll down to _Custom OAuth2_ and click the _+_ button.
Click the _Save_ button at the very bottom of the page.
---
If you have previously used Nextcloud with mailcow authentication via user\_external/IMAP, you need to perform some additional steps to link your existing user accounts with OAuth2.
1\. Click the button in the top right corner and select _Apps_. Scroll down to the _External user authentication_ app and click _Remove_ next to it.
2\. Run the following queries in your Nextcloud database (if you set up Nextcloud using mailcow's script, you can run `source mailcow.conf && docker-compose exec mysql-mailcow mysql -u$DBUSER -p$DBPASS $DBNAME`):
```
INSERT INTO nc_users (uid, uid_lower) SELECT DISTINCT uid, LOWER(uid) FROM nc_users_external;
INSERT INTO nc_sociallogin_connect (uid, identifier) SELECT DISTINCT uid, CONCAT("Mailcow-", uid) FROM nc_users_external;
```
---
If you have previously used Nextcloud without mailcow authentication, but with the same usernames as mailcow, you can also link your existing user accounts with OAuth2.
1\. Run the following queries in your Nextcloud database (if you set up Nextcloud using mailcow's script, you can run `source mailcow.conf && docker-compose exec mysql-mailcow mysql -u$DBUSER -p$DBPASS $DBNAME`):
```
INSERT INTO nc_sociallogin_connect (uid, identifier) SELECT DISTINCT uid, CONCAT("Mailcow-", uid) FROM nc_users;
```
---
## Update
The Nextcloud instance can be updated easily with the web update mechanism. In the case of larger updates, there may be further changes to be made after the update. After the Nextcloud instance has been checked, problems are shown. This can be e.g. missing indices in the DB or similar.
It shows which commands have to be executed, these have to be placed in the php-fpm-mailcow container.
As an an example run the following command to add the missing indices.
It may happen that you cannot reach the Nextcloud instance from your network. This may be due to the fact that the entry of your subnet in the array 'trusted_proxies' is missing. You can make changes in the Nextcloud config.php in `data/web/nextcloud/config/*`.
```
'trusted_proxies' =>
array (
0 => 'fd4d:6169:6c63:6f77::/64',
1 => '172.22.1.0/24',
2 => 'NewSubnet/24',
),
```
After the changes have been made, the nginx container must be restarted.
