详解如何在 CentOS7.0 上搭建DNS 服务器

[root@centos7 ~]# yum install bind-chroot bind -y

[root@centos7 ~]# touch /var/named/chroot/var/named/data/cache_dump.db
[root@centos7 ~]# touch /var/named/chroot/var/named/data/named_stats.txt
[root@centos7 ~]# touch /var/named/chroot/var/named/data/named_mem_stats.txt
[root@centos7 ~]# touch /var/named/chroot/var/named/data/named.run
[root@centos7 ~]# mkdir /var/named/chroot/var/named/dynamic
[root@centos7 ~]# touch /var/named/chroot/var/named/dynamic/managed-keys.bind

[root@centos7 ~]# chmod -R 777 /var/named/chroot/var/named/data
[root@centos7 ~]# chmod -R 777 /var/named/chroot/var/named/dynamic

[root@centos7 ~]# cp -p /etc/named.conf /var/named/chroot/etc/named.conf

[root@centos7 ~]# vi /var/named/chroot/etc/named.conf

..
..
zone "example.local" {
  type master;
  file "example.local.zone";
};

zone "0.168.192.in-addr.arpa" IN {
    type master;
    file "192.168.0.zone";
};
..
..

//
// named.conf
//
// 由Red Hat提供，将 ISC BIND named(8) DNS服务器 
// 配置为暂存域名服务器 (用来做本地DNS解析).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//

options {
    listen-on port 53 { any; };
    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; };

    /*
     - 如果你要建立一个 授权域名服务器 服务器, 那么不要开启 recursion（递归） 功能。
     - 如果你要建立一个 递归 DNS 服务器, 那么需要开启recursion 功能。
     - 如果你的递归DNS服务器有公网IP地址, 你必须开启访问控制功能，
      只有那些合法用户才可以发询问. 如果不这么做的话，那么你的服
      服务就会受到DNS 放大攻击。实现BCP38将有效抵御这类攻击。
    */
    recursion yes;

    dnssec-enable yes;
    dnssec-validation yes;
    dnssec-lookaside auto;

    /* Path to ISC DLV key */
    bindkeys-file "/etc/named.iscdlv.key";

    managed-keys-directory "/var/named/dynamic";

    pid-file "/run/named/named.pid";
    session-keyfile "/run/named/session.key";
};

logging {
    channel default_debug {
        file "data/named.run";
        severity dynamic;
    };
};

zone "." IN {
    type hint;
    file "named.ca";
};

zone "example.local" {
  type master;
  file "example.local.zone";
};

zone "0.168.192.in-addr.arpa" IN {
    type master;
    file "192.168.0.zone";
};

include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";

;
;    Addresses and other host information.
;
$TTL 86400
@    IN   SOA   example.local. hostmaster.example.local. (
                2014101901   ; Serial
                43200   ; Refresh
                3600    ; Retry
                3600000  ; Expire
                2592000 ) ; Minimum

;    Define the nameservers and the mail servers

        IN   NS   ns1.example.local.
        IN   NS   ns2.example.local.
        IN   A    192.168.0.70
        IN   MX   10 mx.example.local.

centos7     IN   A    192.168.0.70
mx        IN   A    192.168.0.50
ns1       IN   A    192.168.0.70
ns2       IN   A    192.168.0.80

[root@centos7 ~]# vi /var/named/chroot/var/named/192.168.0.zone

;
;    Addresses and other host information.
;
$TTL 86400
@    IN   SOA   example.local. hostmaster.example.local. (
                2014101901   ; Serial
                43200   ; Refresh
                3600    ; Retry
                3600000  ; Expire
                2592000 ) ; Minimum

0.168.192.in-addr.arpa. IN   NS   centos7.example.local.

70.0.168.192.in-addr.arpa. IN PTR mx.example.local.
70.0.168.192.in-addr.arpa. IN PTR ns1.example.local.
80.0.168.192.in-addr.arpa. IN PTR ns2.example.local.。

[root@centos7 ~]# /usr/libexec/setup-named-chroot.sh /var/named/chroot on
[root@centos7 ~]# systemctl stop named
[root@centos7 ~]# systemctl disable named
[root@centos7 ~]# systemctl start named-chroot
[root@centos7 ~]# systemctl enable named-chroot
ln -s '/usr/lib/systemd/system/named-chroot.service' '/etc/systemd/system/multi-user.target.wants/named-chroot.s