[Puppet Users] Overriding class options with hiera

[Bilco105]

Hi,

I'm trying to do something with Hiera, whereby the 'default' configuration
for a class is within it's role/profile manifest, which can then be
overridden on a node specific basis by hiera.

As an example;

class profile::base {
class { '::ntp':
servers => ['a', 'b', 'c', 'd']
}
}

node 'blah.com' {
include profile::base
}

hieradata/nodes/blah.com.yaml:
---
ntp::servers:
- 0.uk.pool.ntp.org
- 1.uk.pool.ntp.org

However, I've noticed that hiera's behaviour seems to be that if a
parameter is set like I do for the ntp::server param in the ntp class, it's
not looked up (all the other NTP params are looked up in hiera, except for
servers). Whereas if I just do:

class profile::base {
class { '::ntp': }
}

The server parameter is now looked up from hiera.

Is this intended behaviour?

Thanks,
Rob

[jcbollinger]

Post by Bilco105
Hi,
I'm trying to do something with Hiera, whereby the 'default' configuration
for a class is within it's role/profile manifest, which can then be
overridden on a node specific basis by hiera.
As an example;
class profile::base {
servers => ['a', 'b', 'c', 'd']
}
}
node 'blah.com' {
include profile::base
}
---
- 0.uk.pool.ntp.org
- 1.uk.pool.ntp.org
However, I've noticed that hiera's behaviour seems to be that if a
parameter is set like I do for the ntp::server param in the ntp class, it's
not looked up (all the other NTP params are looked up in hiera, except for
class profile::base {
class { '::ntp': }
}
The server parameter is now looked up from hiera.
Is this intended behaviour?

Yes. If you specify a class parameter value in a parameterized-style class
declaration then that value overrides anything available from hiera. Hiera
data, in turn, overrides any default value set in the class definition:

class ntp ($servers = ['e', 'f', 'g']) {
# stuff
}

If you want site defaults that can be overridden for special nodes, then
put the site defaults at a lower-priority level of your data hierarchy
instead of in a class declaration. Such hierarchical data are what hiera
is all about.


John