During the works on stdmod naming conventions I wondered if we could find a
non intrusive and standard way to allow management of monitoring and
firewalling for modules.
Since there's not a single solution to that and it would be quite hard to
find a shared approach in a reasonable time I thought that it could/should
be enough to define few basic parameters, to be included in a stdmod
compliant module, leaving the actual implementation outside the module.
I thought about having parameters like:
$monitor_class = undef,
$monitor_options_hash = { } ,
$firewall_class = undef,
$firewall_options_hash = { } ,
and inside the module just this ( <%= metadata.name %> is the module name):
if $<%= metadata.name %>::monitor_class {
class { $<%= metadata.name %>::monitor_class:
options_hash => $<%= metadata.name %>::monitor_options_hash,
scope_hash => {}, # TODO: Find a good way to inject class' scope
}
}
if $<%= metadata.name %>::firewall_class {
class { $<%= metadata.name %>::firewall_class:
options_hash => $<%= metadata.name %>::firewall_options_hash,
scope_hash => {},
}
}
$monitor_class is therefore the name of a custom class, external to the module,
where all the monitoring stuff is managed in whatever way.
$monitor_options_hash is an hash of custom configurations that the
$monitor_class knows how to manage .
$scope_hash should be automatically populated by the class's scope variables so
that informations like name of services, port numbers, names of processes
(which should have a standard naming either if expressed as class parameters or
if defined internally in the class) which are generally used for
monitoring/firewalling are automatically provided to the $monitor_class
What do you think of a similar approach?
Does it make sense?
Would you use it in your modules? (even if you don't plan to have monitoring
classes? They could be provided by third party modules)
Would you make it in a different way or with different naming? How?
To populate the $scope_hash it could be used something like
https://github.com/example42/puppi/blob/master/lib/puppet/parser/functions/get_class_args.rb
(is there something similar in stdlib? Would it make sense to add it, also
considering that the original code is by Ken Barber?)
Al
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