Nagios LDAP Monitoring (works for icinga as well)

on commands.cfg file

define command {

        command_name check_ldaps

        command_line    $USER1$/check_ldap.pl -H 192.168.0.123 -p 389

}

on your <server.cfg> file-

define service{

     use generic-service   ; template name, available by default

     host_name LDAP  ; unique name of the host being defined

     service_description LDAP Daemon   ; description of the host

     check_command check_ldaps

}

But this plugin requires Perl Net::LDAP modules installed. For installation of Net::LDAP perl CPAN module, you read this post

Download the check_ldap.pl from here.