I've been using puppet on different companies and implementing the roles /
profile pattern on some of them.
In theory the patter works very well but in practice I usually face
challenges that I sort out implementing my own designs / solutions. I would
like to know how you guys deal with that in case you do.
Say you have a typical LAMP stack and you have to deploy a web app so my
classes would look something like this (super simplified version):
*Modules:*
class apache { //puppetlabs class }
class mysql { //puppetlabs class }
etc./.
*Profile*:
class profile::webapp {
class 'apache'
class 'mysql'
$name = hiera('webapp::name')
apache::vhost {$webapp::name:}
}
*Roles:*
class role::prod_web {
include 'base'
include 'profile::webapp'
}
Now some of the questions I face:
1- Say thate for whatever reason the profile::webap requires a specific
package... ie php-apc that is not covered by the apache module. The roles /
profile states that you should always reference modules. Would you guys
create a new class just to include a resource? What I usually end up doing
is to add that package into the profile for the sake of simplicity.
2- Sometimes modules from puppetlabs or other contributors lacks of some
functionality. Say for example you need to deploy a file under
/etc/sysconfig. I wouldn't place that file under the profile class as that
is used for multiple profiles definitions. However creating a new module
for just a single file seams like too much of an overhead. What I usually
do is I split up the profile module into multiple profile modules and use
the repo -> install -> config -> service pattern. That allows me to create
a file / template where to place my specific resources for that profile and
still consume data from hiera to customize the behaviour.
3- The problem with point 2 is that you might end up with too many profile
classes and some of them might include a simple reference to a module. That
is not much of a problem to me as I prefer to have my files attached to the
right profile module rather than having multiple files on a single profile
module... or multiple modules with just a couple of files.
Cheers!
Juan Breinlinger
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