Redmine is a flexible project management web application. Written using the Ruby on Rails framework, it is cross-platform and cross-database. Redmine 6.1 requires Ruby 3.2 at minimum. Use rbenv to install an appropriate Ruby version. The installation directory can be changed by setting the DOCROOT environment variable. "redmine"-directory will be created inside the DOCROOT. REDMINE_USER and REDMINE_GROUP are used to set the owner of the redmine directory and its contents.