Fixing webmin configuration file in Debian Stretch

PHP 7.0 configuration files

Others -> PHP Configuration -> Module Config:

/etc/php/7.0/apache2/php.ini=Configuration for mod_php
/etc/php/7.0/cgi/php.ini=Configuration for scripts run via CGI
/etc/php/7.0/cli/php.ini=Configuration for command-line scripts

Webmin: Domain Slave in webmin and Domain Master in WHM/CPanel

In WHM/Cpanel server:

• open file /etc/named.conf and edit

    //allow-transfer    { "none"; };
    allow-transfer { your_public_ip_for_slave_dns; }; 

• restart your bind/named

# /scripts/restartsrv_named 

In Debian Jessie server:

• Open webmin, Servers -> BIND DNS Server -> Create slave zone

Zone type : Forward (Names to Adddress)
Domain name / Network : yourdomain.com
Record file : Automatic
Master server : your_debian_ip_address
Server port : Default

• Test Zone Transfer

Testing transfer of slave zone from master_ip_address .... from master_ip_address : Completed OKTest transfer successfully fetched 28 records from at least one nameserver. Actual transfers by BIND should also succeed.

Now you can add/edit your Domain Slave Server in WHM/CPanel -> Edit DNS Zone. 

Reference:

• https://www.debian.org/doc/manuals/network-administrator/ch-bind.html
• http://serverfault.com/questions/403848/configure-secondary-dns-server-debian

Virtualmin creating Sub-Server for Sub-Domain

These are steps to create Sub-Server for Sub-Domain:

1. Virtualmin -> Create Virtual Server
2. Fill Domain name for sub-domain for example subdom.domain.com (domain.com is root domain, change with your root domain) 
3. In Enabled features check these items:
   1. Setup DNS zone?
   2. Setup website for domain?
   3. Setup SSL website too?
   4. Choose one of these Setup Webalizer for web logs? or Enable AWstats reporting? (optional)
   5. Choose other options depend on your requirement

Virtualmin DNS Server Template for multi domain

Virtualmin provides default server template that can be used to configure dns during creating of a new Virtual Server. We can change this default to implement our 'style' in dns record. Go to Virtualmin tab, System Settings, and Server Templates. Choose Default Settings, select Bind DNS domain and click Change. This is my custom configuration for dns record:

1. BIND DNS records for new domains:
   $ttl 38400
   @ IN SOA ns1.${DOM}. hostmaster.${DOM}. (
   1456307163
   10800
   3600
   604800
   38400 )
   ${DOM}. IN A ${IP}
   www.${DOM}. IN A ${IP}
   ftp.${DOM}. IN A ${IP}
   m.${DOM}. IN A ${IP}
   localhost.${DOM}. IN A 127.0.0.1
   webmail.${DOM}. IN A ${IP}
   admin.${DOM}. IN A ${IP}
   mail.${DOM}. IN A ${IP}
   ${DOM}. IN MX 5 mail.${DOM}.
   ${DOM}. IN TXT "v=spf1 a mx a:${DOM} ip4:${IP} ?all"
   ${DOM}. IN NS ns1.${DOM}.
   ${DOM}. IN NS ns2.${DOM}.
   ns1.${DOM}. IN A ${IP}
   ns2.${DOM}. IN A [change-ip-to-your-slave-dns-server]
2. Use only the records above: checked
3. Address records for new domains: unchecked all 
4. Default TTL for DNS records: Use BIND module setting
5. Add nameserver record for this server -> unchecked
6. Add sub-domain DNS records to parent domain? No
7. Master DNS server hostname: Automatic (from system's hostname)
8. Add SPF DNS record? No
9. Does SPF record cover all senders? No
10. Add DMARC DNS record? No 
11. Additional named.conf directives for new zones: None
12. Automatically add named.conf directives: also-notify allow-transfer
13. Create DNSSEC key and sign new domains? No

You can check your dns entry using from this site https://ednscomp.isc.org/ednscomp/