vagrant - How to reuse class in Puppet -

i have puppet class

class project::classname(   $program_name = '',   $command = '' ) {    .... } 

and i'm using this

class { 'project::classname':   program_name => 'programe_name',   command => 'ls /dev/' } 

this works fine, when used twice this

class { 'project::classname':   program_name => 'programe_name',   command => 'ls /dev/' }  class { 'project::classname':   program_name => 'programe_name2',   command => 'ls /dev/' } 

vagrant provision giving me error

error: duplicate declaration: class[project::classname] declared in file ..

so question how can reuse class?

thank you!

you need understand difference of class , defined types.

classes vs defined types  classes not thought of in ‘object oriented’ meaning of class. means machine belongs particular class of machine.  instance, generic webserver class. include class part of node needed built generic webserver. class drop in whatever packages, etc, needed do.  defined types on other hand (created ‘define’) can have many instances on machine, , can encapsulate classes , other resources. can created using user supplied variables. instance, manage iptables, defined type may wrap each rule in iptables file, , iptables configuration built out of fragments generated defined types.  usage of classes , defined types, in addition built-in managed types, helpful towards having managable puppet infrastructure. 

refer: https://docs.puppetlabs.com/guides/best_practices.html