Ubuntu 20.04
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BIND : Configure Secondary Server
2020/05/03
 
Configure DNS Secondary Server (Slave Server).
On this example, it shows to configure DNS Secondary Server [ns.server.education] (192.168.100.85) that DNS Master Server is [dlp.srv.world] (172.16.0.82) configured like here. Replace IP address and Hostname to your own environment.
[1] Configure on DNS Master Server Host.
root@dlp:~#
vi /etc/bind/named.conf.options
.....
.....
options {
        directory "/var/cache/bind";
.....
.....
        allow-query { localhost; internal-network; };
        # add secondary server to allow to transfer zone files
        allow-transfer { localhost; 192.168.100.85; };
        allow-recursion { localhost; internal-network; };
.....
.....

root@dlp:~#
vi /etc/bind/srv.world.wan
$TTL 86400
@   IN  SOA     dlp.srv.world. root.srv.world. (
        # update serial if update zone file
        2020050303  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
        IN  NS      dlp.srv.world.
        # add secondary server
        IN  NS      ns.server.education.
        IN  A       172.16.0.82
        IN  MX 10   dlp.srv.world.

dlp     IN  A       172.16.0.82
www     IN  A       172.16.0.83

root@dlp:~#
systemctl restart named

[2] Configure onDNS Secondary Server Host.
root@ns:~#
vi /etc/bind/named.conf.external-zones
# add target zone info

# for IP address, it's the Master server's IP address

zone "srv.world" IN {
        type slave;
        masters { 172.16.0.82; };
        file "/etc/bind/slaves/srv.world.wan";
};

root@ns:~#
systemctl restart named
root@ns:~#
ls /etc/bind/slaves

srv.world.wan  
# zone file transfered
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