removed DNS_NS2; added default dns options in pdns; enabled slave mode by default

env

 
 DNS_HOSTMASTER=hostmaster.example.com
 DNS_NS1=ns1.example.com
-DNS_NS2=ns2.example.com
 DNS_TTL=600
 
 POSTGRES_DISABLED_SLAVE1=1

pdns/config/pdns.conf

 #################################
 # default-soa-mail  mail address to insert in the SOA record if none set in the backend
 #
-# default-soa-mail=
+default-soa-mail=DNS_HOSTMASTER
 
 #################################
 # default-soa-name  name to insert in the SOA record if none set in the backend
 #
-# default-soa-name=a.misconfigured.powerdns.server
+default-soa-name=DNS_NS1
 
 #################################
 # default-ttl Seconds a result is valid if not set otherwise
 #
-# default-ttl=3600
+default-ttl=DNS_TTL
 
 #################################
 # default-zsk-algorithms  Default ZSK algorithms
 #################################
 # slave Act as a slave
 #
-# slave=no
+slave=yes
 
 #################################
 # slave-cycle-interval  Schedule slave freshness checks once every .. seconds

poweradmin/poweradmin-2.1.8/inc/config.inc.php

 // Predefined DNS settings
 $dns_hostmaster = 'DNS_HOSTMASTER';
 $dns_ns1 = 'DNS_NS1';
-$dns_ns2 = 'DNS_NS2';
 $dns_ttl = DNS_TTL;
 $dns_fancy = false;
 $dns_strict_tld_check = false;