Error saying File etc httpd conf mods-enabled proxy conf is already defined cannot redefined

Question

I'm trying to inherit a module using Puppet

class apache::proxy {
file { '/etc/httpd/conf/mods-enabled/proxy.conf':
source => "puppet:///modules/apache/proxy.conf"
}

Defined my own version:

class myapp {
include apache::proxy
file { '/etc/httpd/conf/mods-enabled/proxy.conf':
source => "puppet:///services/myapp/proxy.conf"
}

It keeps throwing this error:

File[/etc/httpd/conf/mods-enabled/proxy.conf] is already defined; cannot redefined

What do I do?

Answer 1

You can override resources with class inheritance by creating a subclass that inherits resources from the parent class.

class myapp::apache inherits apache::proxy {
file { '/etc/httpd/conf/mods-enabled/proxy.conf':
source => "puppet:///services/myapp/proxy.conf"
}

Then instead of calling the class with the statement include apache::proxy you call the override class with the statement include myapp::apache in the service manifest.

Answer 2

This error occurs when you try to create a service stack from reusable Puppet modules and try altering a resource that has already been defined in the previous module.