Configure Secondary Server

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 [os.srv.onlinebrads] (172.16.0.82) configured like here. Replace IP address and Hostname to your own environment.

1. Configure on DNS Master Server Host.

[root@onlinebrands ~]# vi /etc/named.conf
.....
.....
options {
        listen-on port 53 { any; };
        listen-on-v6 { any; };
        directory       "/var/named";
        dump-file       "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        memstatistics-file "/var/named/data/named_mem_stats.txt";
        secroots-file   "/var/named/data/named.secroots";
        recursing-file  "/var/named/data/named.recursing";
        allow-query     { localhost; internal-network; };
        # add secondary server to allow to transfer zone files
        allow-transfer  { localhost; 192.168.100.85; };
.....
.....

[root@onlinebrands ~]# vi /var/named/srv.onlinebrands.wan
$TTL 86400
@   IN  SOA     os.srv.onlinebrands. root.srv.onlinebrands. (
        # update serial if update zone file
        2021022403  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
        IN  NS      os.srv.onlinebrands.
        # add secondary server
        IN  NS      ns.server.education.
        IN  A       172.16.0.82
        IN  MX 10   os.srv.onlinebrands.

os     IN  A       172.16.0.82
www     IN  A       172.16.0.83

[root@onlinebrands ~]# systemctl restart named

2. Configure on DNS Secondary Server Host.

[root@ns ~]# vi /etc/named.conf
# add target zone info
# for IP address, it's the Master server's IP address
zone "srv.onlinebrands" IN {
        type slave;
        masters { 172.16.0.82; };
        file "slaves/srv.onlinebrands.wan";
        notify no;
};

[root@ns ~]# systemctl restart named
[root@ns ~]# ls /var/named/slaves
srv.world.wan   # zone file transfered