BIND : 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.
[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
[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