dns叢集

輔助dns可以緩解主dns的壓力，當外網主機訪問主dns所維護的域名時，可以看到域名針對外網的解析的ip

輔dns

vim /etc/resolv.conf
3 nameserver 172.25.254.123		改為同步自己的

 vim /etc/named.conf 
 11         listen-on port 53 { any ; };
 17         allow-query     { any; };
 32         dnssec-validation no;

    vim /etc/named.rfc1912.zones
 19  zone "xaut.com" IN {
 20         type slave; 型別輔dns
 21         masters { 172.25.254.81; };    
 22         file "slave/xaut.com.inter";    
 23         allow-update { none; };
 24 };
systemctl restart named
 

主dns

vim xaut.com.inter
 1 $TTL 1D
  2 @       IN SOA  dns.xaut.com. root.xaut.com. (
  3                                         1       ; serial   要修改預設不超過10位
  4                                         1D      ; refresh
  5                                         1H      ; retry
  6                                         1W      ; expire
  7                                         3H )    ; minimum
  8         NS      dns.xaut.com.
  9 dns     A       192.168.254.125
 10 www     A       192.168.254.130
 

vim /etc/named.rfc1912.inter
19 zone "xaut.com" IN {
 20         type master;
 21         file "xaut.com.inter";
 22         also-notify{172.25.254.123;};
 23         allow-update { none; };
 24 };
systemctl restart named

  dig www.xaut.com