如何配置dns解析服务器

sudo apt-get update
sudo apt-get install bind9

zone "example.com" {
    type master;
    file "/etc/bind/db.example.com";
};

$TTL 86400
@       IN      SOA     ns1.example.com. admin.example.com. (
                        2023010101      ; Serial
                        3600            ; Refresh
                        1800            ; Retry
                        604800          ; Expire
                        86400           ; TTL
                )
        IN      NS      ns1.example.com.
        IN      NS      ns2.example.com.
ns1     IN      A       192.168.1.1
ns2     IN      A       192.168.1.2
www     IN      A       192.168.1.100
mail    IN      A       192.168.1.101

zone "example.com" {
    type slave;
    file "/var/cache/bind/example.com.zone";
    masters { 192.168.1.1; };
};

sudo systemctl start bind9
sudo systemctl enable bind9

nslookup www.example.com