On Nov 28, 8:45 am, Boudewijn Ector <beh...@boudewijnector.nl> wrote:
> At my company, we've been trying to get puppet to run properly for > quite some time and it really looks great... except for using external > recipes using parameters etc. > > Let me explain the problem: > > [...] I'm very interested in using the parametrised modules/ > classes which everybody seems to use . You do realize that "Everybody is doing it" is one of the stereotypically terrible reasons for doing anything, right? You should deploy parameterized classes only when and where you decide that they provide the best available solution to a specific problem you are facing. In making such evaluations, you should account for the following considerations: 1) Class parameterization's key purpose is to solve an historical Puppet problem involving the (dynamic) scope of variable names. If you are running Puppet 2.7 now, and it is not warning you about resolving variable names via dynamic scope, then you do not have that problem. 2) Parameterized classes do not serve well in some capacities where unparameterized ones do: 2a) they cannot safely be included more than once in the same catalog 2b) they are usually unsuited for subclassing 2c) they are messy to use where one class includes another, especially when such inclusions are chained. 3) There are alternatives to parameterization for feeding data to your classes: 3a) global variables, including node facts 3b) (other-) class variables 3c) external data (i.e. extlookup() or hiera) 4) Contrary to your perception, not everybody uses or even likes class parameterization 5) On the other hand, if you intend to use run stages (another convenience feature for which there are alternatives), then you may as well give in to the dark side now. You will have many of the problems attending class parameterization for every class that you explicitly assign to a stage, whether those classes are explicitly parameterized or not. John -- You received this message because you are subscribed to the Google Groups "Puppet Users" group. To post to this group, send email to puppet-users@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en.
