This article is relevant for people who are managing their own server as it is necessary to have root access to proceed what is described here.
The first part deals with Solr configuration for multisites with drupal, as the second shows how to build a a solr enabled view. This will combine the power of faceted search in solar with the flexibility of Views to display the results in a nice way.
Considering that the apachesolr module version is 6.x-2.x and Views module is the version 3.