Notify, Subscribe and Exec

• Let us make sure mail to postmaster goes to root and run newaliases when we update this:

• mailalias { "postmaster":

• ensure => present,

• recipient => "root",

• notify => Exec["newaliases"],

• }

• exec { "newaliases":

• path => ["/usr/bin", "/usr/sbin"],

• refreshonly => true,

• }

• On the other hand, we can tell puppet that a service should be restarted when a file changes:

• service { "nrpe":

• ensure => running,

• enable => true,

• subscribe => File["/etc/nagios/nrpe.cfg"];

• }