MediaWiki

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Note: If you are using xampp, instead of LAMP, there are different steps you need to take after installing. More info here

Installation

You need to have a web server, such as Apache installed, configured to be able to use PHP.

Install the php-gd, php-intl and mediawiki, all available from the official repositories.

You will also need a database, such as MySQL, PostgreSQL(postgresql and php-pgsql, or sqlite (php-sqlite and sqlite).

Configuration

The steps to achieve a working MediaWiki configuration involve editing the PHP settings and adding the MediaWiki configuration snippets.

PHP

First, adjust the open_basedir in /etc/php/php.ini to include the mediawiki data directory (/var/lib/mediawiki by default):

/etc/php/php.ini
open_basedir = /srv/http/:/home/:/tmp/:/usr/share/pear/:/usr/share/webapps/:/var/lib/mediawiki/

Then, also in /etc/php/php.ini, uncomment the following lines: (in the Dynamic Extensions section)

extension=gd.so
extension=intl.so
Note:
  • If you would like to use SQLite as database, also uncomment extension=pdo_sqlite.so if using MariaDB uncomment extension=mysqli.so.
  • Since MediaWiki 1.24, it is necessary to also uncomment extension=iconv.so.

Second, tweak the session handling or you might get a fatal error (PHP Fatal error: session_start(): Failed to initialize storage module[...]) by finding the session.save_path path. A good choice can be /var/lib/php/sessions or /tmp/.

/etc/php/php.ini
session.save_path = "/var/lib/php/sessions"

You will need to create the directory if it doesn't exist and then restrict its permissions:

# mkdir -p /var/lib/php/sessions/
# chown http:http /var/lib/php/sessions
# chmod go-rwx /var/lib/php/sessions

Web server

Apache

Copy /etc/webapps/mediawiki/apache.example.conf to /etc/httpd/conf/extra/mediawiki.conf and edit it as needed.

Add the following lines to /etc/httpd/conf/httpd.conf

Include conf/extra/mediawiki.conf

Restart the httpd.service daemon.

Note: The default file from /etc/webapps/mediawiki/apache.example.conf will overwrite the PHP open_basedir setting, possibally conflicting with other pages. This behavior can be changed by moving line starting with php_admin_value between the <Directory> tags.

Nginx

To get MediaWiki working with Nginx, create the following file:

/etc/nginx/mediawiki.conf

location / {
   index index.php;
   try_files $uri $uri/ @mediawiki;
}
location @mediawiki {
   rewrite ^/(.*)$ /index.php?title=$1&$args;
}
location ~ \.php5?$ {
   include /etc/nginx/fastcgi_params;
   fastcgi_pass unix:/var/run/php-fpm/php-fpm.sock;
   fastcgi_index index.php5;
   fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
   try_files $uri @rewrite;
}
location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
   try_files $uri /index.php;
   expires max;
   log_not_found off;
}
# Restrictions based on the .htaccess files
location ^~ ^/(cache|includes|maintenance|languages|serialized|tests|images/deleted)/ {
   deny all;
}
location ^~ ^/(bin|docs|extensions|includes|maintenance|mw-config|resources|serialized|tests)/ {
   internal;
}
location ^~ /images/ {
   try_files $uri /index.php;
}
location ~ /\. {
   access_log off;
   log_not_found off; 
   deny all;
}

Ensure that php-fpm is installed and started.

Include a server directive, similar to this

/etc/nginx/nginx.conf
server {
  listen 80;
  server_name mediawiki;
  root /usr/share/webapps/mediawiki;
  index index.php;
  charset utf-8;
# For correct file uploads
  client_max_body_size    100m; # Equal or more than upload_max_filesize in /etc/php/php.ini
  client_body_timeout     60;
  include mediawiki.conf;

}

Finally, restart the nginx.service daemon.

Lighttpd

You should have Lighttpd installed and configured. "mod_alias" and "mod_rewrite" in server.modules array of lighttpd is required. Append to the lighttpd configuration file the following lines

/etc/lighttpd/lighttpd.conf
alias.url += ("/mediawiki" => "/usr/share/webapps/mediawiki/")
url.rewrite-once += (
                "^/mediawiki/wiki/upload/(.+)" => "/mediawiki/wiki/upload/$1",
                "^/mediawiki/wiki/$" => "/mediawiki/index.php",
                "^/mediawiki/wiki/([^?]*)(?:\?(.*))?" => "/mediawiki/index.php?title=$1&$2"
)

Restart the lighttpd.service daemon.

Database

If the database server is already set up, MediaWiki can automatically create the database (provided that the database root password is supplied) during the next step. Otherwise the database needs to be created manually, see upstream instructions.

LocalSettings.php

Open the wiki url (usually http://your_server/mediawiki/) in a browser and do the initial configuration. Follow upstream instructions.

The generated LocalSettings.php file is offered for download, save it to /usr/share/webapps/mediawiki/LocalSettings.php. This file defines the specific settings of your wiki. Whenever you upgrade the mediawiki package, it is not replaced.

Tips and tricks

Mathematics (texvc)

Usually installing texvc and enabling it in the config are enough:

$wgUseTeX = true;

If you get problems, try to increase limits for shell commands:

$wgMaxShellMemory = 8000000;
$wgMaxShellFileSize = 1000000;
$wgMaxShellTime = 300;

Unicode

Check that php, apache and mysql uses UTF-8. Otherwise you may face strange bugs because of encoding mismatch.

VisualEditor

After following this instruction on how to install the VisualEditor, you need a backend nodejs application on your server, called Parsoid, to get it finally working.

Simply install parsoid-gitAUR from the AUR and adjust the path to your MediaWiki in following file:

/usr/share/webapps/parsoid/api/localsettings.js
parsoidConfig.setInterwiki( 'localhost', 'http://localhost/mediawiki/api.php' );

After that simply enable and start parsoid.service.

Other Extensions

Usually extensions are located in /usr/share/webapps/mediawiki/extensions and managing them manually may, over time, be more work than creating a package in AUR. See mediawiki-ext-confirmaccount-gitAUR[broken link: package not found] and mediawiki-ext-usermerge-gitAUR[broken link: package not found] for examples.