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System configuration


Introduced in Tiki8


System configuration allows for system administrators to change some preferences from outside Tiki. By providing an INI file, administrators can have a central configuration for all of their Tiki installations.

New in Tiki10: Option to load the modules from a static files ( in profile YAML format like http://profiles.tiki.org/Module+Handler ). Search for "Module file" in the admin panel

New in Tiki11: A file db/preconfiguration.php can contain database credentials which are suggested at first Tiki installation. This allows providers of Virtual Servers to preconfigure mysql with different random passwords and usernames before the customers access the Tiki installer.

New in Tiki15: Due to changes in Zend libraries, it is no longer possible to have hierarchical setting of configurations as before. In addition, configuration names can no longer contain dots. For example, client1.example.com will not work. Use client1 instead. Old configurations may not be usable in Tiki 15 and have to be rewritten.




Possible uses for Tiki Farms and hosting companies

  • Connect to other services, such as BigBlueButton, without intervention from the users
  • Configure advanced settings such as Memcache
  • Disable features that are not part of the support plan
  • Respond to security advisories by globally disabling a feature
  • provide tiki_p_admin but make some features inaccessible
  • Hosting company may want to offer all-in-one hosting, but restrict usage of
    • experimental features
    • feature that can be used to gain server access (which is OK for most setups, but not cool for a WikiFarm)
  • Consulting company wants to make simpler admin panels for a customer
  • Using Tiki as an application builder (framework)


Activate the system configuration

The system configuration must be enabled from the db/local.php file. Installations created from Tiki8 and beyond contain samples in the file created by default.

Sample configuration in db/local.php
$system_configuration_file = '/etc/tiki.ini';
$system_configuration_identifier = 'client1';


Another sample configuration in db/local.php, with a relative path
$system_configuration_file = 'db/tiki.ini';
$system_configuration_identifier = 'client1';

If you do this example, make sure .htaccess is active so the tiki.ini can't be read.

When enabled, Tiki will read additional directives from the configuration file based on the selected identifier. The identifier is arbitrary, but can be used either to specify the site or the plan. In the configuration file, multiple configurations can be defined and inheritance can be used.

INI configuration file


Sample INI file
[global]
preference.feature_wysiwyg = "n"
preference.feature_sefurl = "y"
preference.helpurl = "http://support.example.com/"
; ... more settings ...

[basic : global]
; ... this hierarchical block no longer works from Tiki 15 onwards
preference.feature_wiki = "y"
preference.feature_forums = "n"
preference.feature_trackers = "n"
; ... more settings ...

[pro : global]
; ... this hierarchical block no longer works from Tiki 15 onwards
preference.feature_wiki = "y"
; BBB configured, but user can still toggle on/off
preference.bigbluebutton_server_location = "bbb.example.com"
preference.bigbluebutton_server_salt = "1234abcd1234abcd"
; ... more settings ...

[client1 : pro]
; ... this hierarchical block no longer works from Tiki 15 onwards, but [client1] will
preference.browsertitle = "Client #1 Intranet"
preference.sender_email = client1@example.com


In the example above, the following preferences would be set for using the identifier client1:
  • feature_wysiwyg = n
  • feature_sefurl = y
  • helpurl = http://support.example.com/
  • feature_wiki = y
  • bigbluebutton_server_location = bbb.example.com
  • bigbluebutton_server_salt = 1234abcd1234abcd
  • browsertitle = Client #1 Intranet
  • sender_email = client1 at example.com


; at the beginning indicates comments

Disable classes of preferences

Preferences can be disabled by setting a value to each of them individually. However, this process may be long and will require maintenance with the evolutions of Tiki.

Tiki allows to set multiple rule priorities, each verification priority can allow or deny a preference. Rules can be specified at various levels, just like the preference overrides above.

Various rules
[global]
rules.0 = deny experimental new

[pro : global]
; ... this hierarchical block no longer works from Tiki 15 onwards
rules.5 = allow new
rules.10 = allow feature_wysiwyg


In the previous example, sites using the pro identifier would be allowed to use new features and wysiwyg (which is tagged as experimental), including new experimental features, but still be denied old experimental features. Higher priorities are evaluated first and the lookup stops once there is a match.

A draconian provider could use something like this:

Draconian provider configuration
[global]
rules.0 = deny all
rules.1 = allow basic


The preferences need to be tagged in the definitions using the 'tags' key containing an array. Unless specified otherwise, all preferences are considered 'advanced'.

Important note about arrays

Instead of
preference.flaggedrev_approval_categories.0 = "40;41;97;231"


This is the formula
How to set an array
preference.flaggedrev_approval_categories.0 = "40"
preference.flaggedrev_approval_categories.1 = "41"
preference.flaggedrev_approval_categories.2 = "97"
preference.flaggedrev_approval_categories.3 = "231"


or
How to set an array
preference.flaggedrev_approval_categories[] = "40"
preference.flaggedrev_approval_categories[] = "41"
preference.flaggedrev_approval_categories[] = "97"
preference.flaggedrev_approval_categories[] = "231"




Preconfiguration file


When providing on-demand Virtual Machines with Tiki pre-loaded, hosting companies can provide mysql with a database and connection credentials which are different for each customer.
When accessing stage Set the Database Connection of the installer, these values will be prefilled for the customer. This is more efficient than providing them by mail or other means.
These information can obviously not be contained in db/local.php since local.php does not yet exist.

All there is to do is uncomment the appropriate lines in file db/preconfiguration.php and fill the appropriate values:
db/preconfiguration.php
<?php
// This is Tiki's preconfiguration file.
// This holds values which can provide preconfiguration values in the installer, when local.php does not yet exist
// Uncomment and change values as appropriate
$host_tiki_preconfig='localhost';
$user_tiki_preconfig='tiki';
$pass_tiki_preconfig='password';
$dbs_tiki_preconfig='tiki_db';


Environment variable configuration


Tiki will also read information about the database connection and system configuration through environment variables. These can be set through the web server's configuration.

Sample nginx configuration
fastcgi_pass unix:/var/run/php5-fpm.sock;
fastcgi_index route.php;
include fastcgi_params;
fastcgi_param MYSQLCONNSTR_Tiki "Database=client1;Data Source=localhost;User Id=client1;Password=secret";
fastcgi_param TIKI_INI_FILE "/etc/tiki.ini";
fastcgi_param TIKI_INI_IDENTIFIER "client1";


Related

Tiki.ini File | Tiki.ini | INI

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