DNS Server

$ sudo zypper remove bind

$ sudo systemctl mask --now named.service

$ sudo yum install bind-chroot

$ sudo cp /etc/named.conf /var/named/chroot/etc/named.conf
$ sudo chown root:root /var/named/chroot/etc/named.conf
$ sudo chmod 644 /var/named/chroot/etc/named.conf

options {
directory "/path/to/DIRNAME ";
...
}

$ sudo cp -r /path/to/DIRNAME /var/named/chroot/DIRNAME

ROOTDIR=/var/named/chroot

acl internal {
  SUBNET ;
  localhost;
};
view "internal-view" {
  match-clients { internal; };
  zone "." IN {
    type hint;
    file "db.cache";
  };
  zone "internal.example.com " IN {
    ...
  };
};

view "external-view" {
  match-clients { any; };
  recursion no;
  zone "example.com " IN {
    ...
  };
};

options {
  allow-query { any; };
  recursion no;
  ...
};
zone "example.com " IN {
  ...
};

acl internal {
  SUBNET ;
  localhost;
};
options {
  allow-query { internal; };
  ...
};
zone "internal.example.com " IN {
  ...
};