#  cd /etc/icinga2/zones.d/master/

#  vi host.conf
or a new file

mk

object Host "client.kozo.ch" {
check_command = "hostalive" //check is executed on the master
display_name = "client test"
address = "10.147.42.63"
vars.os = "debian9"
zone = "master"
vars.client_endpoint = name //follows the convention that host name == endpoint name
}


object Service "apt" {
host_name = "client.kozo.ch"
check_command = "apt"
command_endpoint = host_name
}

 icinga2-01.kozo.ch

10.147.42.36

object Endpoint "icinga2-01.kozo.ch" {
        host = "10.147.42.36"
        port = "5665"
 }

object Zone "master" {
        endpoints = [ "icinga2-01.kozo.ch" ]
 }

object Endpoint "client" {
 }

object Zone "client" {
     endpoints = [ "client" ]
     parent = "master"
 }