The ITK Multi-Processing Module (MPM) works in about the same way as the classical «prefork» module (that is, without threads), except that it allows you to constrain each individual vhost to a particular system user. This allows you to run several different web sites on a single server without worrying that they will be able to read each others’ files. This is a third-party MPM that is not included in the normal Apache httpd.
Please note that this MPM is somewhat less tested than the MPMs that come with Apache itself.
Запуск Apache с правами пользователя, от которого был запуск, а не с правами www group
Веб-сервер работает в режиме MPM и для работы с файлом конфигурации httpd.conf нужно использовать параметр AssignUserID вместо SuexecUserGroup.
AssignUserID UserName UserGroup
Ubuntu – Подробная информация о пакете apache2-mpm-itk в lucid.