Organization of Wikimedia Commons analogue for own Wiki

Wiki engines are widely distributed on the Internet. Wiki markup and many convenient extensions allow you to cover a wide range of tasks: from creating a page for personal notes to a corporate knowledge center.

Suppose your path is to install a wiki on a shared hosting. This solution is found quite often - you do not need to raise Apache and configure MySQL, and for individual hosting sites and suffer from ocaml and latex. Access to a virtual server is often more reliable than access to a corporate one.

There are two minuses in this decision:
1) Wiki itself provokes the writing of documentation, which leads to its quite rapid growth. As a result, we run into restrictions on the amount of available disk space of paid hosting.
2) To place on corporate servers some corporate files - not feng shui.

We can solve our problems by storing all the files attached to the wiki pages (pictures, pdf, measurement telemetry, etc.) on the production server.
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MediaWiki allows the implementation of this concept without additional dancing with a tambourine.

We install on the working MediaWiki server. In my case, the server was a weak QNAP (network storage system (NAS)) with a constant external IP. It runs Apache and MySQL from the factory, a two-disk RAID. But linux is quite stripped down, which does not allow you to quickly assemble a full-fledged latex, ocalm, etc., and therefore full use of MediaWiki.

In MediaWiki on QNAP, we allow uploading files, for which we add / change in LocalSettings.php:
$wgEnableUploads = true;
$wgCheckFileExtensions = false;


Customize user rights on your own.

In MediaWiki on a paid host, add in a similar file:
$wgForeignFileRepos[] = array(
'class' => 'ForeignAPIRepo',
'name' => 'servercommon', # , ...
'apibase' => 'http://YOURFILESERVER/wiki/api.php', # API QNAP
'hashLevels' => 2,
'fetchDescription' => true,
'descriptionCacheExpiry' => 43200, # ,
'apiThumbCacheExpiry' => 86400, #
);

$wgUploadNavigationUrl = "http://YOURFILESERVER.ru/wiki/index.php/Special:Upload"; # " " QNAP

$wgEnableUploads = true; # " "


Now you can use the second wiki (on the production server) as Wikipedia uses Wikimedia Commons — upload files to the second wiki, and use the same syntax that you use for its own files in the first. For example,
[[File:MyPic.png]]

A question for connoisseurs: how to organize a shared account for two wikis standing on different machines?