Server Groups

If you have more than one server configured, then you can take advantage of the Server Groups which allows you to define a relationship with primary and secondary servers.

Define Server Group

When defining (or modifying) a zone, you can choose which DNS servers will host the zone. This can be specific servers, server groups, or All Servers.

Define Server Group

When specifying a server group that has primary and secondary servers defined, fmDNS will build the zone differently on each type of server -- as a primary zone on the primaries and a secondary zone on the secondaries while automatically listing the IPs of the primaries on the secondaries. When defining the server group and the Automatically set also-notify is set, then fmDNS will also automatically define also-notify on the primaries with the IPs of the secondaries in the group.

dns1

===========================================================================
/etc/named/zones/zones.conf.all:
===========================================================================
// This file was built using fmDNS 7.1.1 on Thu, 24 Apr 2025 16:01:11 +0000 UTC

zone "test-domain.com" {
    type primary;
    file "/etc/named/zones/primary/db.test-domain.com.hosts";
    also-notify { 192.168.1.101; };
};

dns2

===========================================================================
/etc/named/zones/zones.conf.all:
===========================================================================
// This file was built using fmDNS 7.1.1 on Thu, 24 Apr 2025 16:02:29 +0000 UTC

zone "test-domain.com" {
    type slave;
    file "/etc/named/zones/slave/db.test-domain.com.0.hosts";
    masters { 192.168.1.100; };
};

Note

You can also just define groups consisting of only primary servers to keep zones configured only on certain primary servers.

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