ubuntu下配置dns反向解析

sudo nano /etc/bind/named.conf.local

zone "x.x.x.in-addr.arpa" {
    type master;
    file "/etc/bind/db.x.x.x";
};

sudo nano /etc/bind/db.x.x.x

;
; BIND data file for local loopback interface
;
$TTL    604800
@       IN      SOA     localhost. root.localhost. (
                              2         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;
@       IN      NS      localhost.
@       IN      PTR     example.com.

sudo named-checkconf
sudo named-checkzone x.x.x.in-addr.arpa /etc/bind/db.x.x.x

sudo systemctl restart bind9