# Public network
192.168.56.110 rac1.example.com rac1
192.168.56.111 rac2.example.com rac2
# Virtual IPs
192.168.56.121 rac1-vip.example.com rac1-vip
192.168.56.122 rac2-vip.example.com rac2-vip
# SCAN IPs
192.168.56.131 scan-ls.example.com scan-ls
192.168.56.132 scan-ls.example.com scan-ls
192.168.56.133 scan-ls.example.com scan-ls
# Private interconnect (optional)
192.168.10.1 rac1-priv
192.168.10.2 rac2-priv
yum install -y bind bind-utils
/etc/named.conf
options {
directory "/var/named";
listen-on port 53 { 127.0.0.1; 192.168.56.110; };
allow-query { 127.0.0.1; 192.168.56.0/24; 192.168.10.0/24; };
recursion yes;
// Lab simplifications
dnssec-enable no;
dnssec-validation no;
auth-nxdomain no;
};
zone "example.com" IN {
type master;
file "db.example.com";
};
zone "56.168.192.in-addr.arpa" IN {
type master;
file "db.192.168.56";
};
zone "10.168.192.in-addr.arpa" IN {
type master;
file "db.192.168.10";
};
mkdir /var/named/
/var/named/db.example.com
$TTL 86400
@ IN SOA rac1.example.com. root.example.com. (
2025100801 ; Serial (bump on edits)
3600 ; Refresh
1800 ; Retry
604800 ; Expire
86400 ) ; Minimum
@ IN NS rac1.example.com.
; DNS server itself
rac1 IN A 192.168.56.110
; Public hosts
rac2 IN A 192.168.56.111
; VIPs
rac1-vip IN A 192.168.56.121
rac2-vip IN A 192.168.56.122
; SCAN (must have 3 A records)
scan-ls IN A 192.168.56.131
scan-ls IN A 192.168.56.132
scan-ls IN A 192.168.56.133
; Private (optional)
rac1-priv IN A 192.168.10.1
rac2-priv IN A 192.168.10.2
/var/named/db.192.168.56
$TTL 86400
@ IN SOA rac1.example.com. root.example.com. (
2025100801
3600
1800
604800
86400 )
@ IN NS rac1.example.com.
110 IN PTR rac1.example.com.
111 IN PTR rac2.example.com.
121 IN PTR rac1-vip.example.com.
122 IN PTR rac2-vip.example.com.
131 IN PTR scan-ls.example.com.
132 IN PTR scan-ls.example.com.
133 IN PTR scan-ls.example.com.
/var/named/db.192.168.10
$TTL 86400
@ IN SOA rac1.example.com. root.example.com. (
2025100801
3600
1800
604800
86400 )
@ IN NS rac1.example.com.
1 IN PTR rac1-priv.example.com.
2 IN PTR rac2-priv.example.com.
chown root:named /var/named/db.example.com /var/named/db.192.168.56 /var/named/db.192.168.10
chmod 640 /var/named/db.*
named-checkconf
named-checkzone example.com /var/named/db.example.com
named-checkzone 56.168.192.in-addr.arpa /var/named/db.192.168.56
named-checkzone 10.168.192.in-addr.arpa /var/named/db.192.168.10
Modify /etc/resolv.conf as below
search example.com
nameserver 192.168.56.110
Make file readonly
chattr +i /etc/resolv.conf
systemctl enable --now named
systemctl status named --no-pager
