gistfile1.txt

# tomcat class

class tomcat::install (
  $tomcat_version = 'undef',
  [...],
  $tomcat_groups = 'undef' ) {
  
     user { 'tomcat':
      ensure     => 'present',
      home       => '/home/tomcat',
      managehome => true,
      shell      => '/bin/bash',
      gid        => 'tomcat',
      groups     => ["${tomcat_groups}"],
      require    => Group['tomcat'],
    }

# node manifest
  class { 'tomcat::install':
    tomcat_version => '8.0.36',
    tomcat_groups  => ['group1', 'group2'],
  }