【Oracle RAC Database】通过DNS实现SCAN VIP的域名解析

[root@node04 ~]# yum install -y bind
[root@node04 ~]# vim /etc/named.conf
options {
        listen-on port 53 { 192.168.1.104; };
        /* 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;
        forwarders { 221.179.155.161; 219.141.136.10; 202.106.196.115; };
        dnssec-enable no;
        dnssec-validation no;
        /* Path to ISC DLV key */
        bindkeys-file "/etc/named.iscdlv.key";
        managed-keys-directory "/var/named/dynamic";
};
zone "." IN {
        type hint;
        file "named.ca";
};
zone "gscaifu.com" IN {
        type master;
        file "gscaifu.com.zone";
};
include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";

[root@node04 ~]# cd /var/named
[root@node04 named]# cp -p named.localhost gscaifu.com.zone
[root@node04 named]# vim gscaifu.com.zone
$TTL 1D
@       IN SOA  @ rname.invalid. (
                                        0       ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
             NS @
             IN A    192.168.1.104
cluster      IN A    192.168.1.201
cluster      IN A    192.168.1.202
cluster      IN A    192.168.1.203

[root@node04 ~]# systemctl start named.service
[root@node04 ~]# systemctl enable named.service
[root@node04 ~]# systemctl status named.service

[root@node04 ~]# netstat -tunlp | grep named
tcp        0      0 192.168.1.104:53        0.0.0.0:*               LISTEN      1048/named          
tcp        0      0 127.0.0.1:953           0.0.0.0:*               LISTEN      1048/named          
tcp6       0      0 ::1:953                 :::*                    LISTEN      1048/named          
udp        0      0 192.168.1.104:53        0.0.0.0:*                           1048/named     

[root@node01 ~]# cat /etc/resolv.conf 
# Generated by NetworkManager
nameserver 192.168.1.104

[root@node01 ~]# nslookup cluster.gscaifu.com
Server:         192.168.1.104
Address:        192.168.1.104#53
Name:   cluster.gscaifu.com
Address: 192.168.1.201
Name:   cluster.gscaifu.com
Address: 192.168.1.202
Name:   cluster.gscaifu.com
Address: 192.168.1.203

[root@node02 ~]# cat /etc/resolv.conf 
# Generated by NetworkManager
nameserver 192.168.1.104

[root@node02 ~]# nslookup cluster.gscaifu.com
Server:         192.168.1.104
Address:        192.168.1.104#53
Name:   cluster.gscaifu.com
Address: 192.168.1.201
Name:   cluster.gscaifu.com
Address: 192.168.1.202
Name:   cluster.gscaifu.com
Address: 192.168.1.203