Defined types are great for reducing the complexity and improving the readability of your code. However, they can lead to some interesting problems that may be difficult to diagnose.
In the following code, we create a defined type that creates a host entry:
define myhost ($short,$ip) {
host {"$short":
ip => $ip,
host_aliases => [
"$title.example.com",
"$title.example.net",
"$short"
],
}
}In this define, the namevar for the host resource is an argument of the define, the $short variable.
Tip
In Puppet, there are two important attributes of any resource—the namevar and the title. The confusion lies in the fact that, sometimes, both of these attributes have the same value. Both values must be unique, but they are used differently. The title is used to uniquely identify the resource to the compiler and need not be related to the actual resource. The namevar uniquely identifies the resource to the agent after the catalog is compiled. The namevar...