DNS Slave Server2013/07/03

	Configure DNS as a Slave Server. It's easy to set up it. Following example shows an environment that master DNS is "dlp.srv.world", Slave DNS is "ns.example.host".
[1]	Write config in Zone file on Master DNS.

[root@dlp ~]#

vi /etc/named.conf

# add IP address of slave DNS

allow-transfer { localhost;

172.16.0.85;

};

[root@dlp ~]#

vi /var/named/srv.world.wan

$TTL 86400
@   IN  SOA     dlp.srv.world. root.srv.world. (

# update serial

        2013070303  ;Serial

        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
        IN  NS      dlp.srv.world.

# add name server

        IN  NS      ns.example.host.

        IN  A       172.16.0.82
        IN  MX 10   dlp.srv.world.

dlp     IN  A       172.16.0.82

[root@dlp ~]#

systemctl restart named.service

[2]	Configuration on Slave DNS.

[root@ns ~]#

vi /etc/named.conf

# add lines like below

    zone "srv.world" IN {
        type slave;
        masters { 172.16.0.82; };
        file "slaves/srv.world.wan";
        notify no;
    };

[root@ns ~]#

systemctl restart named.service

[root@ns ~]#

ls /var/named/slaves

srv.world.wan

# zone file in master DNS has been just transfered

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