Thanks for your reply Fenix. By environment I meant Puppet
environment, so for example, I'd have production and development.
Production contains Varnish, Development is always non-Varnish. I then
have a selector in the apache module which, depending on the
environment, grabs a Hiera value, so something like:
$apachelisten = $::environment ? {
'production' => $apache::params::prod_listen,
'development' => $apache::params::dev_listen,
}
Then in params.pp:
class apache::params {
$prod_listen = hiera('apache_prod_listen')
etc.
or do you think there is a better way of doing this with Hiera?
On Jun 7, 10:54 am, Felix Frank <felix.fr...@alumni.tu-berlin.de>
wrote:
> On 06/07/2012 11:30 AM, Andy Taylor wrote:
>
> > 1. Have Varnish/non-Varnish systems separated by environment and have
> > a conditional in the module which changes the listen port dependent on
> > the environment of the node;
>
> What do you mean by "environment"? I think this should be a hiera based
> approach, which would seem all right to me.
>
> > 2. Use the 'defined' function (I've done a fair bit of reading on
> > this, and it looks like it isn't really recommended due to parse order
> > issues, and might even be removed in a future Puppet release)
>
> Exactly. Don't do this.
>
> > 3. Have the Varnish module create a resource of some sort and have the
> > Apache module check for its existence. But I assume I will run into
> > parse ordering issues with this, unless I put Varnish in a pre run
> > stage or similar.
>
> As long as your dependencies are simple, you can do a subclass based
> approach. Say your apache port is defined inside the apache::config
> class, you could devise something like this:
>
> class apache::config::alt_port($port) inherits apache::config {
> # override the contents of ports config file
> File["/etc/apache2/ports.conf"] { content => ... }
>
> }
>
> Then the varnish module includes this subclass
>
> class { "apache::config::alt_port": port => "8080" }
>
> Note that this will get you in trouble as soon as two separate instances
> want to fiddle with apache's port.
> A hiera based approach will most likely allow you to keep things much
> cleaner.
>
> Cheers,
> Felix
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