Mediawikiがデプロイ先で500エラーを起こす時に真っ先に確認すること ref: http://qiita.com/suneo3476/items/43704f0f58e194c2883f

file0.txt

#$wgScriptPath = "http://my.domain.com";
$wgScriptPath  = "http://localhost/mwiki";

#$wgServer = "http://my.domain.com";
$wgServer  = "http://localhost/mwiki";

file1.txt

## Database settings
$wgDBtype     = "mysql";
$wgDBserver   = "localhost";
$wgDBname     = "mediawiki";
$wgDBuser     = "root";
$wgDBpassword = "passForLocal";