I am installing a two node RAC on my testbed (virtualbox), i have setup the DNS server, forward lookup is not working but reverse lookup is, PFB
[root@dbwr1 log]# nslookup dbwr1.localdomain
Server: 192.168.24.1
Address: 192.168.24.1#53
** server can't find dbwr1.localdomain: NXDOMAIN
[root@dbwr1 log]# nslookup 192.168.24.41
41.24.168.192.in-addr.arpa name = dbwr-scan.localdomain.
[root@dbwr1 log]#
[root@dbwr1 log]# nslookup 192.168.24.42
42.24.168.192.in-addr.arpa name = dbwr-scan.localdomain.
[root@dbwr1 log]# nslookup 192.168.24.43
43.24.168.192.in-addr.arpa name = dbwr-scan.localdomain.
Scan IP List
192.168.24.41 dbwr-scan.localdomain dbwr-scan
192.168.24.42 dbwr-scan.localdomain dbwr-scan
192.168.24.43 dbwr-scan.localdomain dbwr-scan
forward.zone
[root@dbwr1 log]# cat /var/named/localdomain.zone
N SOA dbwr1.localdomain.com. root.localdomain.com. (
2014051001 ; serial
3600 ; refresh
1800 ; retry
604800 ; expire
86400 ; minimum
)
@ IN NS dbwr1.localdomain.
localhost IN A 127.0.0.1
dbwr1 IN A 192.168.24.1
dbwr2 IN A 192.168.24.2
dbwr1-priv IN A 192.168.10.1
dbwr2-priv IN A 192.168.10.1
dbwr1-vip IN A 192.168.24.31
dbwr2-vip IN A 192.168.24.32
dbwr-scan IN A 192.168.24.41
dbwr-scan IN A 192.168.24.42
dbwr-scan IN A 192.168.24.43
content of named.conf
[root@dbwr1 log]# cat /etc/named.conf
//
// 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.
//
// See the BIND Administrator's Reference Manual (ARM) for details about the
// configuration located in /usr/share/doc/bind-{version}/Bv9ARM.html
options {
listen-on port 53 { 127.0.0.1; 192.168.24.1;};
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";
recursing-file "/var/named/data/named.recursing";
secroots-file "/var/named/data/named.secroots";
allow-query { localhost; 192.168.24.1;};
/*
- If you are building an AUTHORITATIVE DNS server, do NOT enable recursion.
- If you are building a RECURSIVE (caching) DNS server, you need to enable
recursion.
- If your recursive DNS server has a public IP address, you MUST enable access
control to limit queries to your legitimate users. Failing to do so will
cause your server to become part of large scale DNS amplification
attacks. Implementing BCP38 within your network would greatly
reduce such attack surface
*/
recursion yes;
dnssec-enable yes;
dnssec-validation yes;
/* Path to ISC DLV key */
bindkeys-file "/etc/named.root.key";
managed-keys-directory "/var/named/dynamic";
pid-file "/run/named/named.pid";
session-keyfile "/run/named/session.key";
};
logging {
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
zone "." IN {
type hint;
file "named.ca";
};
zone "localdomain.com" IN {
type master;
file "localdomain.zone";
allow-update { none; };
};
zone "24.168.192.in-addr.arpa." IN {
type master;
file "24.168.192.in-addr.arpa";
allow-update { none; };
};
include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";
IP configuration
[root@dbwr1 log]# ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.24.1 netmask 255.255.255.0 broadcast 192.168.24.255
inet6 fe80::2e2:d129:475:e4ec prefixlen 64 scopeid 0x20<link>
ether 08:00:27:8b:c7:b1 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 32 bytes 4389 (4.2 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp0s8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.10.1 netmask 255.255.255.0 broadcast 192.168.10.255
inet6 fe80::29a6:749e:ebc2:9160 prefixlen 64 scopeid 0x20<link>
ether 08:00:27:18:8c:83 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 33 bytes 4426 (4.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp0s9: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.8 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::72e5:e509:b983:7879 prefixlen 64 scopeid 0x20<link>
ether 08:00:27:0b:4d:1d txqueuelen 1000 (Ethernet)
RX packets 3113 bytes 289859 (283.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1868 bytes 307668 (300.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 262 bytes 21283 (20.7 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 262 bytes 21283 (20.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:6c:b4:75 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
