Config.php Parameters

ownCloud uses the config/config.php file to control server operations. config/config.sample.php lists all the configurable parameters within ownCloud, along with example or default values. This document provides a more detailed reference. Most options are configurable on your Admin page, so it is usually not necessary to edit config/config.php.


The installer creates a configuration containing the essential parameters. Only manually add configuration parameters to config/config.php if you need to use a special value for a parameter. Do not copy everything from ``config/config.sample.php``. Only enter the parameters you wish to modify!

Default Parameters

These parameters are configured by the ownCloud installer, and are required for your ownCloud server to operate.

'instanceid' => '',

This is a unique identifier for your ownCloud installation, created automatically by the installer. This example is for documentation only, and you should never use it because it will not work. A valid instanceid is created when you install ownCloud.

‘instanceid’ => ‘d3c944a9a’,

'passwordsalt' => '',

The salt used to hash all passwords, auto-generated by the ownCloud installer. (There are also per-user salts.) If you lose this salt you lose all your passwords. This example is for documentation only, and you should never use it.

‘passwordsalt’ => ‘d3c944a9af095aa08f’,

'trusted_domains' =>
  array (

Your list of trusted domains that users can log into. Specifying trusted domains prevents host header poisoning. Do not remove this, as it performs necessary security checks.

'datadirectory' => '/var/www/owncloud/data',

Where user files are stored; this defaults to data/ in the ownCloud directory. The SQLite database is also stored here, when you use SQLite. (SQLite is available only in ownCloud Community Edition)

'version' => '',

The current version number of your ownCloud installation. This is set up during installation and update, so you shouldn’t need to change it.

'dbtype' => 'sqlite',

Identifies the database used with this installation. See also config option supportedDatabases

  • sqlite (SQLite3 - Community Edition Only)
  • mysql (MySQL/MariaDB)
  • pgsql (PostgreSQL)
  • oci (Oracle - Enterprise Edition Only)
  • mssql (Microsoft SQL Server - Enterprise Edition Only)
'dbhost' => '',

Your host server name, for example localhost, hostname,, or the IP address. To specify a port use hostname:####; to specify a Unix socket use localhost:/path/to/socket.

'dbname' => 'owncloud',

The name of the ownCloud database, which is set during installation. You should not need to change this.

'dbuser' => '',

The user that ownCloud uses to write to the database. This must be unique across ownCloud instances using the same SQL database. This is set up during installation, so you shouldn’t need to change it.

'dbpassword' => '',

The password for the database user. This is set up during installation, so you shouldn’t need to change it.

'dbtableprefix' => '',

Prefix for the ownCloud tables in the database.

'dbdriveroptions' => array(
        PDO::MYSQL_ATTR_SSL_CA => '/file/path/to/ca_cert.pem',

Additional driver options for the database connection, eg. to enable SSL encryption in MySQL.

'installed' => false,

Indicates whether the ownCloud instance was installed successfully; true indicates a successful installation, and false indicates an unsuccessful installation.

Default config.php Examples

When you use SQLite as your ownCloud database, your config.php looks like this after installation. The SQLite database is stored in your ownCloud data/ directory. SQLite is a simple, lightweight embedded database that is good for testing and for simple installations, but for production ownCloud systems you should use MySQL, MariaDB, or PosgreSQL.

$CONFIG = array (
  'instanceid' => 'occ6f7365735',
  'passwordsalt' => '2c5778476346786306303',
  'trusted_domains' =>
  array (
    0 => 'localhost',
    1 => 'studio',
  'datadirectory' => '/var/www/owncloud/data',
  'dbtype' => 'sqlite3',
  'version' => '',
  'installed' => true,

This example is from a new ownCloud installation using MariaDB:

$CONFIG = array (
  'instanceid' => 'oc8c0fd71e03',
  'passwordsalt' => '515a13302a6b3950a9d0fdb970191a',
  'trusted_domains' =>
  array (
    0 => 'localhost',
    1 => 'studio',
    2 => ''
  'datadirectory' => '/var/www/owncloud/data',
  'dbtype' => 'mysql',
   'version' => '',
  'dbname' => 'owncloud',
  'dbhost' => 'localhost',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'oc_carla',
  'dbpassword' => '67336bcdf7630dd80b2b81a413d07',
  'installed' => true,

User Experience

These optional parameters control some aspects of the user interface. Default values, where present, are shown.

'default_language' => 'en',

This sets the default language on your ownCloud server, using ISO_639-1 language codes such as en for English, de for German, and fr for French. It overrides automatic language detection on public pages like login or shared items. User’s language preferences configured under “personal -> language” override this setting after they have logged in.

'defaultapp' => 'files',

Set the default app to open on login. Use the app names as they appear in the URL after clicking them in the Apps menu, such as documents, calendar, and gallery. You can use a comma-separated list of app names, so if the first app is not enabled for a user then ownCloud will try the second one, and so on. If no enabled apps are found it defaults to the Files app.

'knowledgebaseenabled' => true,

true enables the Help menu item in the user menu (top right of the ownCloud Web interface). false removes the Help item.

'enable_avatars' => true,

true enables avatars, or user profile photos. These appear on the User page, on user’s Personal pages and are used by some apps (contacts, mail, etc). false disables them.

'allow_user_to_change_display_name' => true,

true allows users to change their display names (on their Personal pages), and false prevents them from changing their display names.

'remember_login_cookie_lifetime' => 60*60*24*15,

Lifetime of the remember login cookie, which is set when the user clicks the remember checkbox on the login screen. The default is 15 days, expressed in seconds.

'session_lifetime' => 60 * 60 * 24,

The lifetime of a session after inactivity; the default is 24 hours, expressed in seconds.

'session_keepalive' => true,

Enable or disable session keep-alive when a user is logged in to the Web UI.

Enabling this sends a “heartbeat” to the server to keep it from timing out.

'skeletondirectory' => '/path/to/owncloud/core/skeleton',

The directory where the skeleton files are located. These files will be copied to the data directory of new users. Leave empty to not copy any skeleton files.

'user_backends' => array(
                'class' => 'OC_User_IMAP',
                'arguments' => array('{}INBOX')

The user_backends app (which needs to be enabled first) allows you to configure alternate authentication backends. Supported backends are: IMAP (OC_User_IMAP), SMB (OC_User_SMB), and FTP (OC_User_FTP).

Mail Parameters

These configure the email settings for ownCloud notifications and password resets.

'mail_domain' => '',

The return address that you want to appear on emails sent by the ownCloud server, for example, substituting your own domain, of course.

'mail_from_address' => 'owncloud',

FROM address that overrides the built-in sharing-noreply and lostpassword-noreply FROM addresses.

'mail_smtpdebug' => false,

Enable SMTP class debugging.

'mail_smtpmode' => 'sendmail',

Which mode to use for sending mail: sendmail, smtp, qmail or php.

If you are using local or remote SMTP, set this to smtp.

If you are using PHP mail you must have an installed and working email system on the server. The program used to send email is defined in the php.ini file.

For the sendmail option you need an installed and working email system on the server, with /usr/sbin/sendmail installed on your Unix system.

For qmail the binary is /var/qmail/bin/sendmail, and it must be installed on your Unix system.

'mail_smtphost' => '',

This depends on mail_smtpmode. Specified the IP address of your mail server host. This may contain multiple hosts separated by a semi-colon. If you need to specify the port number append it to the IP address separated by a colon, like this:

'mail_smtpport' => 25,

This depends on mail_smtpmode. Specify the port for sending mail.

'mail_smtptimeout' => 10,

This depends on mail_smtpmode. This set an SMTP server timeout, in seconds. You may need to increase this if you are running an anti-malware or spam scanner.

'mail_smtpsecure' => '',

This depends on mail_smtpmode. Specify when you are using ssl or tls, or leave empty for no encryption.

'mail_smtpauth' => false,

This depends on mail_smtpmode. Change this to true if your mail server requires authentication.

'mail_smtpauthtype' => 'LOGIN',

This depends on mail_smtpmode. If SMTP authentication is required, choose the authentication type as LOGIN (default) or PLAIN.

'mail_smtpname' => '',

This depends on mail_smtpauth. Specify the username for authenticating to the SMTP server.

'mail_smtppassword' => '',

This depends on mail_smtpauth. Specify the password for authenticating to the SMTP server.

Proxy Configurations

'overwritehost' => '',

The automatic hostname detection of ownCloud can fail in certain reverse proxy and CLI/cron situations. This option allows you to manually override the automatic detection; for example, or specify the port

'overwriteprotocol' => '',

When generating URLs, ownCloud attempts to detect whether the server is accessed via https or http. However, if ownCloud is behind a proxy and the proxy handles the https calls, ownCloud would not know that ssl is in use, which would result in incorrect URLs being generated.

Valid values are http and https.

'overwritewebroot' => '',

ownCloud attempts to detect the webroot for generating URLs automatically.

For example, if is the URL pointing to the ownCloud instance, the webroot is /owncloud. When proxies are in use, it may be difficult for ownCloud to detect this parameter, resulting in invalid URLs.

'overwritecondaddr' => '',

This option allows you to define a manual override condition as a regular expression for the remote IP address. For example, defining a range of IP addresses starting with 10.0.0. and ending with 1 to 3: ^10\.0\.0\.[1-3]$

'overwrite.cli.url' => '',

Use this configuration parameter to specify the base url for any urls which are generated within ownCloud using any kind of command line tools (cron or occ). The value should contain the full base URL:

'proxy' => '',

The URL of your proxy server, for example

'proxyuserpwd' => '',

The optional authentication for the proxy to use to connect to the internet.

The format is: username:password.

Deleted Items (trash bin)

These parameters control the Deleted files app.

'trashbin_retention_obligation' => 30,

When the trash bin app is enabled (default), this is the number of days a file will be kept in the trash bin. Default is 30 days.

'trashbin_auto_expire' => true,

Disable or enable auto-expiration for the trash bin. By default auto-expiration is enabled.

ownCloud Verifications

ownCloud performs several verification checks. There are two options, true and false.

'appcodechecker' => true,

Check 3rd party apps to make sure they are using the private API and not the public API. If the app uses the private API it cannot be installed.

'updatechecker' => true,

Check if ownCloud is up-to-date and shows a notification if a new version is available.

'has_internet_connection' => true,

Is ownCloud connected to the Internet or running in a closed network?

'check_for_working_webdav' => true,

Allows ownCloud to verify a working WebDAV connection. This is done by attempting to make a WebDAV request from PHP.

'check_for_working_htaccess' => true,

This is a crucial security check on Apache servers that should always be set to true. This verifies that the .htaccess file is writable and works.

If it is not, then any options controlled by .htaccess, such as large file uploads, will not work. It also runs checks on the data/ directory, which verifies that it can’t be accessed directly through the web server.

'config_is_read_only' => false,

In certain environments it is desired to have a read-only config file.

When this switch is set to true ownCloud will not verify whether the configuration is writable. However, it will not be possible to configure all options via the web-interface. Furthermore, when updating ownCloud it is required to make the config file writable again for the update process.


'log_type' => 'owncloud',

By default the ownCloud logs are sent to the owncloud.log file in the default ownCloud data directory. If syslogging is desired, set this parameter to syslog.

'logfile' => 'owncloud.log',

Change the ownCloud logfile name from owncloud.log to something else.

'loglevel' => 2,

Loglevel to start logging at. Valid values are: 0 = Debug, 1 = Info, 2 = Warning, 3 = Error. The default value is Warning.

'logdateformat' => 'F d, Y H:i:s',

This uses formatting; see

'logtimezone' => 'Europe/Berlin',

The default timezone for logfiles is UTC. You may change this; see

'log_query' => false,

Append all database queries and parameters to the log file. Use this only for debugging, as your logfile will become huge.

'cron_log' => true,

Log successful cron runs.

'log_rotate_size' => false,

Enables log rotation and limits the total size of logfiles. The default is 0, or no rotation. Specify a size in bytes, for example 104857600 (100 megabytes = 100 * 1024 * 1024 bytes). A new logfile is created with a new name when the old logfile reaches your limit. The total size of all logfiles is double the log_rotate_sizerotation value.

Alternate Code Locations

Some of the ownCloud code may be stored in alternate locations.

'3rdpartyroot' => '',

ownCloud uses some 3rd party PHP components to provide certain functionality.

These components are shipped as part of the software package and reside in owncloud/3rdparty. Use this option to configure a different location.

'3rdpartyurl' => '',

If you have an alternate 3rdpartyroot, you must also configure the URL as seen by a Web browser.

'customclient_desktop' =>
'customclient_android' =>
'customclient_ios' =>

This section is for configuring the download links for ownCloud clients, as seen in the first-run wizard and on Personal pages.


Options for the Apps folder, Apps store, and App code checker.

'appstoreenabled' => true,

When enabled, admins may install apps from the ownCloud app store.

The app store is disabled by default for ownCloud Enterprise Edition

'appstoreurl' => '',

The URL of the appstore to use.

'apps_paths' => array(
                'path'=> '/var/www/owncloud/apps',
                'url' => '/apps',
                'writable' => true,

Use the apps_paths parameter to set the location of the Apps directory, which should be scanned for available apps, and where user-specific apps should be installed from the Apps store. The path defines the absolute file system path to the app folder. The key url defines the HTTP web path to that folder, starting from the ownCloud web root. The key writable indicates if a web server can write files to that folder.

'appcodechecker' => true,

Check 3rd party apps to make sure they are using the private API and not the public API. If the app uses the private API it cannot be installed.


ownCloud supports previews of image files, the covers of MP3 files, and text files. These options control enabling and disabling previews, and thumbnail size.

'enable_previews' => true,

By default, ownCloud can generate previews for the following filetypes:

  • Images files
  • Covers of MP3 files
  • Text documents

Valid values are true, to enable previews, or false, to disable previews

'preview_max_x' => null,

The maximum width, in pixels, of a preview. A value of null means there is no limit.

'preview_max_y' => null,

The maximum height, in pixels, of a preview. A value of null means there is no limit.

'preview_max_scale_factor' => 10,

If a lot of small pictures are stored on the ownCloud instance and the preview system generates blurry previews, you might want to consider setting a maximum scale factor. By default, pictures are upscaled to 10 times the original size. A value of 1 or null disables scaling.

'preview_max_filesize_image' => 50,

max file size for generating image previews with imagegd (default behaviour) If the image is bigger, it’ll try other preview generators, but will most likely show the default mimetype icon

Value represents the maximum filesize in megabytes Default is 50 Set to -1 for no limit

'preview_libreoffice_path' => '/usr/bin/libreoffice',

custom path for LibreOffice/OpenOffice binary

'preview_office_cl_parameters' =>
        ' --headless --nologo --nofirststartwizard --invisible --norestore '.
        '-convert-to pdf -outdir ',

Use this if LibreOffice/OpenOffice requires additional arguments.

'enabledPreviewProviders' => array(

Only register providers that have been explicitly enabled

The following providers are enabled by default:

  • OC\Preview\Image
  • OC\Preview\MarkDown
  • OC\Preview\MP3
  • OC\Preview\TXT

The following providers are disabled by default due to performance or privacy concerns:

  • OC\Preview\Movie
  • OC\Preview\MSOffice2003
  • OC\Preview\MSOffice2007
  • OC\Preview\MSOfficeDoc
  • OC\Preview\OpenDocument
  • OC\Preview\PDF
  • OC\Preview\StarOffice
  • OC\Preview\SVG


Troubleshooting steps for the MS Word previews are available at the Configuring the Collaborative Documents App section of the Administrators Manual.

The following providers are not available in Microsoft Windows:

  • OC\Preview\Movie
  • OC\Preview\MSOfficeDoc
  • OC\Preview\MSOffice2003
  • OC\Preview\MSOffice2007
  • OC\Preview\OpenDocument
  • OC\Preview\StarOffice


Global settings used by LDAP User and Group Backend

'ldapUserCleanupInterval' => 51,

defines the interval in minutes for the background job that checks user existance and marks them as ready to be cleaned up. The number is always minutes. Setting it to 0 disables the feature.

See command line (occ) methods ldap:show-remnants and user:delete


These options are for halting user activity when you are performing server maintenance.

'maintenance' => false,

Enable maintenance mode to disable ownCloud

If you want to prevent users to login to ownCloud before you start doing some maintenance work, you need to set the value of the maintenance parameter to true. Please keep in mind that users who are already logged-in are kicked out of ownCloud instantly.

'singleuser' => false,

When set to true, the ownCloud instance will be unavailable for all users who are not in the admin group.


'forcessl' => false,

Change this to true to require HTTPS for all connections, and to reject HTTP requests.

'openssl' => array(
        'config' => '/absolute/location/of/openssl.cnf',

Extra SSL options to be used for configuration.


'blacklisted_files' => array('.htaccess'),

Blacklist a specific file or files and disallow the upload of files with this name. .htaccess is blocked by default.


'share_folder' => '/',

Define a default folder for shared files and folders other than root.

'theme' => '',

If you are applying a theme to ownCloud, enter the name of the theme here.

The default location for themes is owncloud/themes/.

'xframe_restriction' => true,

X-Frame-Restriction is a header which prevents browsers from showing the site inside an iframe. This is be used to prevent clickjacking. It is risky to disable this, so leave it set at true.

'cipher' => 'AES-256-CFB',

The default cipher for encrypting files. Currently AES-128-CFB and AES-256-CFB are supported.

'memcached_servers' => array(
        // hostname, port and optional weight. Also see:
        array('localhost', 11211),
        //array('', 11211),

Server details for one or more memcached servers to use for memory caching.

Memcache is only used if other memory cache options (xcache, apc, apcu) are not available.

'cache_path' => '',

Location of the cache folder, defaults to data/$user/cache where $user is the current user. When specified, the format will change to $cache_path/$user where $cache_path is the configured cache directory and $user is the user.

'quota_include_external_storage' => false,

EXPERIMENTAL: option whether to include external storage in quota calculation, defaults to false.

'filesystem_check_changes' => 1,

Specifies how often the filesystem is checked for changes made outside ownCloud.

0 -> Never check the filesystem for outside changes, provides a performance increase when it’s certain that no changes are made directly to the filesystem

1 -> Check each file or folder at most once per request, recommended for general use if outside changes might happen.

2 -> Check every time the filesystem is used, causes a performance hit when using external storages, not recommended for regular use.

'asset-pipeline.enabled' => false,

All css and js files will be served by the web server statically in one js file and one css file if this is set to true.


Test this thoroughly on production systems as it should work reliably with core apps, but you may encounter problems with community/third-party apps.

'mount_file' => 'data/mount.json',

Where mount.json file should be stored, defaults to data/mount.json

'filesystem_cache_readonly' => false,

When true, prevent ownCloud from changing the cache due to changes in the filesystem for all storage.

'objectstore' => array(
        'class' => 'OC\\Files\\ObjectStore\\Swift',
        'arguments' => array(
                // trystack will user your facebook id as the user name
                'username' => 'facebook100000123456789',
                // in the trystack dashboard go to user -> settings -> API Password to
                // generate a password
                'password' => 'Secr3tPaSSWoRdt7',
                // must already exist in the objectstore, name can be different
                'container' => 'owncloud',
                // create the container if it does not exist. default is false
                'autocreate' => true,
                // required, dev-/trystack defaults to 'RegionOne'
                'region' => 'RegionOne',
                // The Identity / Keystone endpoint
                'url' => '',
                // required on dev-/trystack
                'tenantName' => 'facebook100000123456789',
                // dev-/trystack uses swift by default, the lib defaults to 'cloudFiles'
                // if omitted
                'serviceName' => 'swift',

The example below shows how to configure ownCloud to store all files in a swift object storage.

It is important to note that ownCloud in object store mode will expect exclusive access to the object store container because it only stores the binary data for each file. The metadata is currently kept in the local database for performance reasons.

WARNING: The current implementation is incompatible with any app that uses direct file IO and circumvents our virtual filesystem. That includes Encryption and Gallery. Gallery will store thumbnails directly in the filesystem and encryption will cause severe overhead because key files need to be fetched in addition to any requested file.

One way to test is applying for a trystack account at

'supportedDatabases' => array(

Database types that are supported for installation.

  • sqlite (SQLite3 - Community Edition Only)
  • mysql (MySQL)
  • pgsql (PostgreSQL)
  • oci (Oracle - Enterprise Edition Only)
  • mssql (Microsoft SQL Server - Enterprise Edition Only)
'custom_csp_policy' =>
        "default-src 'self'; script-src 'self' 'unsafe-eval'; ".
        "style-src 'self' 'unsafe-inline'; frame-src *; img-src *; ".
        "font-src 'self' data:; media-src *",

Custom CSP policy, changing this will overwrite the standard policy

'secret' => 'ICertainlyShouldHaveChangedTheDefaultSecret',

Secret used by ownCloud for various purposes, e.g. to encrypt data. If you lose this string there will be data corruption.

App config options

Retention for activities of the activity app:

'activity_expire_days' => 365,

Every day a cron job is ran, which deletes all activities for all users which are older then the number of days that is set for activity_expire_days