The configuration of a DNS server is optional, however mandatory if you want Enterprise performance. The DNS should resolve the SCAN Listeners VIPs and it will do that in a round robin fashion. Below you can see a configuration of a DNS server zone:
That file is located at /etc/named.conf and has the settings for the zones and the location of the zone files. This file does not have the actual zone configurations and IP resolutions.
//
// named.conf
//
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS
// server as a caching only nameserver (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//
options {
listen-on port 53 { 192.168.100.20; };
listen-on-v6 port 53 { ::1; };
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";
allow-query { any; };
recursion yes;
dnssec-enable yes;
dnssec-validation yes;
/* Path to ISC DLV key */
bindkeys-file "/etc/named.iscdlv.key";
managed-keys-directory "/var/named/dynamic";
};
logging {
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
zone "." IN {
type hint;
file "named.ca";
};
zone "myrac.com" IN {
type master;
file "myrac.com.zone";
allow-update { none; };
};
include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";
The file name should be as defined in “file parameter” in the zone setting and located at: /var/named/file_name
[root@lparacb ~]# cat /var/named/myrac.com.zone
$TTL 86400
@ IN SOA ns1.myrac.com. root.myrac.com. (
2013042201 ;Serial
3600 ;Refresh
1800 ;Retry
604800 ;Expire
86400 ;Minimum TTL
)
; Specify our two nameservers
IN NS ns1.myrac.com.
; Resolve nameserver hostnames to IP, replace with your two droplet IP addresses.
ns1 IN A 192.168.100.20
; Define hostname -> IP pairs which you wish to resolve
lparac-scan IN A 192.168.100.101
lparac-scan IN A 192.168.100.102
lparac-scan IN A 192.168.100.103
lparaca-pub IN A 192.168.100.10
lparacb-pub IN A 192.168.100.20
lparaca-vip IN A 192.168.100.11
lparacb-vip IN A 192.168.100.21
lparaca IN A 192.168.100.10
lparacb IN A 192.168.100.20
[root@lparacb ~]#
If any changes has been done, a restart of the service is needed
[root@lparacb ~]# service named restart Stopping named: . [ OK ] Starting named: [ OK ] [root@lparacb ~]#