Setting a fact based on an included role (class)

[Rabbie Zalaf]

Hi All,

I am building a cluster of nodes in a master-less configuration.

I wanted to ask for some assistance in setting a fact based on an included role, early on in the configuration so that this fact is available for all profiles further down the deployment track.

I have the necessary configuration to reference the fact once it's been set but can't figure out how to set the fact early enough.

Rabbie

[Felix Frank]

Hi,

that's a classic problem. It boils down to the ability to do this at
some point in your manifest:

if this_node_includes(class_X) {
# do stuff only for the <x> nodes
}

Puppet cannot compile this sort of manifest in a safe manner. It's
usually better to steer clear of such constructs.

Instead, implement some external logic that tells nodes whether they
should include class_X in the first place. This can be a flag that is
stored as a Hiera value, or a setting in your ENC.

You end up with very simple manifest constructs then.

# in site.pp perhaps
if $should_include_class_X {
include class_X
}

and everywhere else, instead of asking this_node_includes(class_X), you
cann just rely on the $should_include_class_X value.

HTH,
Felix