Where in Yii2 init some subdomain settings?

I have site with subdomains (news.site.com, events.site.com etc). i am added to config my custom url rule, who find by requested url article in DB and call article controller with action show

for example: 'http://ift.tt/2cCDF6Y' i want find in db article with url = 'some-article-with-custom-url' and call actionShow() in ArticleController

but on news.site.com and events.site.com i want find articles with different site_id (column in db)

news.site.com - 'select * from article where site_id = 1 ...' events.site.com - 'select * from article where site_id = 2 ...'

where i can init some subdomains settings, if on UrlManager level i must have algready have this settings?

'urlManager' => [
  'rules' = [
    ...
    [
      'class' => 'common\components\ArticleUrlRule'
    ],
  ]
]

implementation of parse req of this class:

public function parseRequest($manager, $request) { $articleId = Article::getArticleIdByUrl($request->pathInfo);

    if ( !empty($articleId) ) {
        return [
            'article/show',
            [
                'id' => $articleId
            ]
        ];
    }

    return false;
}