Some Nextcloud snap settings may need to be done directly in the config.php configuration file. While the default configurations are mostly fine, it may be necessary to fine tune Nextcloud snap.

The configuration file can be edited manually.

• Backup config.php

sudo cp /var/snap/nextcloud/current/nextcloud/config/config.php config.php.bak

• Edit config.php

sudo nano /var/snap/nextcloud/current/nextcloud/config/config.php 

Adding multiple trusted domains manually in config.php:

• edit config.php

sudo nano /var/snap/nextcloud/current/nextcloud/config/config.php 

and add/edit section

 'trusted_domains' =>
  array (
    0 => 'cloud.yourdomain.xyz',
    1 => 'cloud.yourotherdomain.zxy',
    2 => 'localhost',
    3 => 'nextcloud.local',
  ),

or issue occ command on host (iterating values 0, 1, 2...):

sudo nextcloud.occ config:system:set trusted_domains 0 --value=cloud.yourdomain.xyz

Adding trusted proxies manually in config.php:

edit config.php and add/edit section

sudo nano /var/snap/nextcloud/current/nextcloud/config/config.php 

  'trusted_proxies' => 
  array (
    0 => 'your.reverse.proxy.ip',
    1 => 'your.other.proxy.ip',
   ),

or issue occ command on host (iterating values 0, 1, 2...):

sudo nextcloud.occ config:system:set trusted_proxies 0 --value="your.reverse.proxy.ip"

Nextcloud overwrite parameters such as overwriteprotocol and overwritehost are two configs that absolutely depend on your reverse proxy setup.

Be aware that some devices require an additional setting in config.php if your Nextcloud snap instance is behind a reverse proxy.

For internet facing Nextcloud snap that handles encryption itself or a pass-through reverse proxy is present it shouldn't be necessary to set overwriteprotocol and overwritehost.

edit config.php and add/edit section

    'overwriteprotocol' => 'https',

    'overwritehost' => 'cloud.yourdomain.xyz',

or issue occ command on host:

sudo nextcloud.occ config:system:set overwriteprotocol --value="https"

sudo nextcloud.occ config:system:set overwritehost --value="cloud.yourdomain.xyz"

Set default maintenance window time 01:00 (1 a.m.)

edit config.php and add/edit line in config.php

    'maintenance_window_start' => 1,

or issue occ command on host:

sudo nextcloud.occ config:system:set maintenance_window_start --value="1"

country codes

edit config.php and add/edit line in config.php

    'default_phone_region' => 'GB',

or issue occ command on host:

sudo nextcloud.occ config:system:set default_phone_region --value="GB"

country codes

edit config.php and add/edit line in config.php

    'default_language' => 'en',

or issue occ command on host:

sudo nextcloud.occ config:system:set default_language --value="en"

country codes

edit config.php and add/edit line in config.php

    'default_locale' => 'en_GB',

or issue occ command on host:

sudo nextcloud.occ config:system:set default_locale --value="en_GB"

edit config.php and add/edit line in config.php

default value is "" (empty)

  'defaultapp' => '<appname>',

or issue occ command on host:

sudo nextcloud.occ config:system:set defaultapp --value="<appname>"

example: sudo nextcloud.occ config:system:set defaultapp --value="mail"

or

edit config.php and add/edit line in config.php

    'has_internet_connection' => 'true',

or issue occ command on host:

sudo nextcloud.occ config:system:set has_internet_connection --value="true"

edit config.php and add/edit line in config.php

    'share_folder' => '/SHARE_with_others',

or issue occ command on host:

sudo nextcloud.occ config:system:set share_folder --value="/SHARE_with_others"

edit config.php and add/edit line in config.php

    'share_folder' => '/SHARED_with_me',

or issue occ command on host:

sudo nextcloud.occ config:system:set share_folder --value="/SHARED_with_me"

'trashbin_retention_obligation' => 'auto',

sudo nextcloud.occ config:app:delete files_trashbin background_job_expire_trash

Example: keep files and folders in the trash bin for at least 90 days and delete when exceeds 120 days

edit config.php and add/edit line in config.php

    'trashbin_retention_obligation' => '90, 120',

or issue occ command on host:

sudo nextcloud.occ config:system:set trashbin_retention_obligation --value="90, 120"

to enable the background job issue command:

sudo nextcloud.occ config:app:delete files_trashbin background_job_expire_trash

to disable the background job issue command:

sudo nextcloud.occ config:app:set --value=no files_trashbin background_job_expire_trash

see docs: https://docs.nextcloud.com/server/latest/admin_manual/configuration_files/trashbin_configuration.html

sudo nextcloud.occ trashbin:cleanup --all-users

sudo nextcloud.occ groupfolders:trashbin:cleanup -f 

Default documents, files and folders for new users may be placed in a "skeleton" directory. Thus new users will find documents files an folders in their Nextcloud upon first login. Create a skeleton directory /var/snap/nextcloud/common/skeleton

sudo mkdir /var/snap/nextcloud/common/skeleton

Add your default files folders here. You may also add group folders here. See Group folders app

edit config.php and add skeleton directory path

    'skeletondirectory' => '/var/snap/nextcloud/common/skeleton',

or issue occ command on host:

sudo nextcloud.occ config:system:set skeletondirectory --value="/var/snap/nextcloud/common/skeleton"

    'session.cookie_secure' => 'true',

or issue command on host:

sudo nextcloud.occ config:system:set session.cookie_secure --value="true"

the default session lifetime ist 24 hours after which an idle user will be logged out automatically. Session lifetime and auto logout may be configured to suit your needs.

• session_lifetime parameters are not user specific and apply to all users when configured
• auto_logout is required and dependent on session_lifetime

Official Nextcloud documentationm

edit config.php and add/edit section

sudo nano /var/snap/nextcloud/current/nextcloud/config/config.php 

    'session_lifetime' => 28800,
    'session_keepalive' => false,
    'auto_logout' => true,

edit config.php and add/edit line in config.php

    'simpleSignUpLink.shown' => false,

or issue occ command on host:

sudo nextcloud.occ config:system:set simpleSignUpLink.shown --value="false"

If your user backend does not allow password resets (e.g. when it's a read-only user backend like LDAP), disable password reset link

edit config.php and add/edit line in config.php

    'lost_password_link' => 'disabled',

or issue occ command on host:

sudo nextcloud.occ config:system:set lost_password_link --value="disabled"

you can specify a custom link, where the user is redirected to, when clicking the "reset password" link after a failed login-attempt

'lost_password_link' => 'https://example.org/link/to/password/reset',