We've seen classes before, when we used the class keyword to group together the Puppet resources that implement some particular service, such as Nginx:
# Manage nginx webserver
class nginx {
package { 'nginx':
ensure => installed,
}
}The class keyword introduces a new class definition:
class nginx {
...
}You can also specify some parameters that the class accepts:
class appserver($domain,$database) {
...
}The parameters can take default values, as with a definition:
class hadoop($role = 'node') {
...
}It's a good idea to organize your classes into modules, just as we did with the nginx class. Each class should be stored in the modules/MODULE_NAME/manifests directory, in a file named after the class, with each file containing just one class.
So if we create an nginx::loadbalancer class, the definition should look like this:
class nginx::loadbalancer {
...
}It should go in the file modules/nginx/manifests/loadbalancer.pp.
The...