We're currently arguing^w discussing the use of the params class in
conjunction with hiera lookups and we've arrived at what I think is a
pretty good pattern. Let me explain by way of example, using the venerable
ntp application
class ntp{
include ::ntp::params
Class['::ntp::params']->
class{'::ntp::install':}->
class{'::ntp::config':}~>
class{'::ntp::service':}->
class{'::ntp::firewall':}->
Class['::Ntp']
}
class ntp::params(
$servers,
$package_ensure = 'present',
$service_ensure = 'running',
$service_enable = true,
) {
# os-specific stuff could go in here
$packages = ['ntp']
$service_name = 'ntpd'
$config_file = '/etc/ntp/ntpd.conf'
}
class ntp::install{
include ::ntp::params
package{$::ntp::params::packages:
ensure => $::ntp::params::package_ensure,
}
}
class ntp::config{
include ::ntp::params
# explicitly declare any vars used in the template
$servers = $::ntp::params::servers
file{$::ntp::params::config_file":
content => template(...)
}
}
class ntp::service{
include ::ntp::params
service{$::ntp::params::service_name":
ensure => $::ntp::params::service_ensure,
enable => $::ntp::params::service_enable",
}
}
class ntp::firewall{
include ::ntp::params
# firewall definition in here
}
The basic approach is that all user-changeable values are passed in via the
params class. This class should be instantiated before the ntp class.
Typically, this class would be used in a profile class something like this:
class profile_ntp(
$servers,
) {
class{'::ntp::params':
servers => $servers,
}->
class{'::ntp'}
}
Alternatively, $servers could come from an explicit hiera lookup:
class profile_ntp{
class{'::ntp::params':
servers => hiera('ntp::servers')
}->
class{'::ntp'}
}
The hiera key would of course be profile_ntp::servers
I can't decide whether I prefer the explicit lookup or the automatic
approach.
I'd be interested to hear any feedback on this approach.
R.
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