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分类: LINUX

2009-09-24 09:59:53

如何在内网的环境下实习DNS服务器呢?经过1个多星期的时间,终于探索出了DNS配置的方式方法。先分析网络架构和域名安排,再遵照指定的步骤,定能配好!

我的外网IP是10.10.23.144,属于校园网。内网IP是192.168.0.1,兼做网关,是centos5的双网卡系统。web服务器是192.168.0.2,DNS服务器是192.168.0.1,当然别的服务还可以再在别的IP机器上配置,就如法炮制即可。

需要安装的rpm包有:bind-util-9.3.4、bind-9.3.4、bind-libs-9.3.4、bind-chroot-9.3.4,然后为了快速配置,安装caching-nameserver包,这样就可以省去很多自建文件的麻烦事。安装完毕后,采用了chroot监牢机制,非常安全。这时必须注意:配置文件的实际目录是/var/named/chroot/,虚拟目录如果是/etc,则真实目录是/var/named/chroot/etc。但只有两个目录是常用的,一个是/etc,一个是/var,/etc下放named.conf,剩下的文件放在/var中。

1、named.conf中的内容:
//
// Sample named.conf BIND DNS server 'named' configuration file
// for the Red Hat BIND distribution.
//
// See the BIND Administrator's Reference Manual (ARM) for details, in:
//   file:///usr/share/doc/bind-*/arm/Bv9ARM.html
// Also see the BIND Configuration GUI : /usr/bin/system-config-bind and
// its manual.
//
options
{
        // Those options should be used carefully because they disable port
        // randomization
    query-source    port 53;   
    //query-source-v6 port 53;
   
    // Put files that named is allowed to write in the data/ directory:
    directory "/var/named"; // the default
    dump-file         "data/cache_dump.db";
        statistics-file     "data/named_stats.txt";
        memstatistics-file     "data/named_mem_stats.txt";

};
logging
{
/*      If you want to enable debugging, eg. using the 'rndc trace' command,
 *      named will try to write the 'named.run' file in the $directory (/var/named).
 *      By default, SELinux policy does not allow named to modify the /var/named directory,
 *      so put the default debug log file in data/ :
 */
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };   
};
//
// All BIND 9 zones are in a "view", which allow different zones to be served
// to different types of client addresses, and for options to be set for groups
// of zones.
//
// By default, if named.conf contains no "view" clauses, all zones are in the
// "default" view, which matches all clients.
//
// If named.conf contains any "view" clause, then all zones MUST be in a view;
// so it is recommended to start off using views to avoid having to restructure
// your configuration files in the future.
//
view "localhost_resolver"
{
/* This view sets up named to be a localhost resolver ( caching only nameserver ).
 * If all you want is a caching-only nameserver, then you need only define this view:
 */
    match-clients         { localhost;localnets; };
    match-destinations    { localhost;localnets; };
    recursion yes;
    # all views must contain the root hints zone:
    include "/etc/named.root.hints";

        /* these are zones that contain definitions for all the localhost
         * names and addresses, as recommended in RFC1912 - these names should
     * ONLY be served to localhost clients:
     */
     zone "liukai.com"    {
         type master;
         file "liukai.com.db";
     };
     zone "0.168.192.in-addr.arpa"    IN{
         type master;
         file "liukai.com.db.arpa";
     };
    include "/etc/named.rfc1912.zones";
};

2、liukai.com.db中的内容:
@ in soa localhost. root 1 3H 15M 1W 1D
  ns localhost.
dns    IN    A    192.168.0.1
www    IN    A    192.168.0.2
ok    IN    CNAME    www
ko    IN    CNAME    www

3、liukai.com.db.arpa中的内容:
@ in soa localhost. root 1 3H 15M 1W 1D
  ns localhost.
2    IN    PTR   
1    IN    PTR    dns.liukai.com

4、named.root.hints中的内容:(也放在/var/named/chroot/var/named);       This file holds the information on root name servers needed to
;       initialize cache of Internet domain name servers
;       (e.g. reference this file in the "cache  .  "
;       configuration file of BIND domain name servers).
;
;       This file is made available by InterNIC
;       under anonymous FTP as
;           file                /domain/named.root
;           on server          
;       -OR-                    RS.INTERNIC.NET
;
;       last update:    Dec 12, 2008
;       related version of root zone:   2008121200
;
; formerly NS.INTERNIC.NET
;
.                        3600000  IN  NS    A.ROOT-SERVERS.NET.
A.ROOT-SERVERS.NET.      3600000      A     198.41.0.4
A.ROOT-SERVERS.NET.      3600000      AAAA  2001:503:BA3E::2:30
;
; FORMERLY NS1.ISI.EDU
;
.                        3600000      NS    B.ROOT-SERVERS.NET.
B.ROOT-SERVERS.NET.      3600000      A     192.228.79.201
;
; FORMERLY C.PSI.NET
;
.                        3600000      NS    C.ROOT-SERVERS.NET.
C.ROOT-SERVERS.NET.      3600000      A     192.33.4.12
;
; FORMERLY TERP.UMD.EDU
;
.                        3600000      NS    D.ROOT-SERVERS.NET.
D.ROOT-SERVERS.NET.      3600000      A     128.8.10.90
;
; FORMERLY NS.NASA.GOV
;
.                        3600000      NS    E.ROOT-SERVERS.NET.
E.ROOT-SERVERS.NET.      3600000      A     192.203.230.10
;
; FORMERLY NS.ISC.ORG
;
.                        3600000      NS    F.ROOT-SERVERS.NET.
F.ROOT-SERVERS.NET.      3600000      A     192.5.5.241
F.ROOT-SERVERS.NET.      3600000      AAAA  2001:500:2F::F
;
; FORMERLY NS.NIC.DDN.MIL
;
.                        3600000      NS    G.ROOT-SERVERS.NET.
G.ROOT-SERVERS.NET.      3600000      A     192.112.36.4
;
; FORMERLY AOS.ARL.ARMY.MIL
;
.                        3600000      NS    H.ROOT-SERVERS.NET.
H.ROOT-SERVERS.NET.      3600000      A     128.63.2.53
H.ROOT-SERVERS.NET.      3600000      AAAA  2001:500:1::803F:235
;
; FORMERLY NIC.NORDU.NET
;
.                        3600000      NS    I.ROOT-SERVERS.NET.
I.ROOT-SERVERS.NET.      3600000      A     192.36.148.17
;
; OPERATED BY VERISIGN, INC.
;
.                        3600000      NS    J.ROOT-SERVERS.NET.
J.ROOT-SERVERS.NET.      3600000      A     192.58.128.30
J.ROOT-SERVERS.NET.      3600000      AAAA  2001:503:C27::2:30
;
; OPERATED BY RIPE NCC
;
.                        3600000      NS    K.ROOT-SERVERS.NET.
K.ROOT-SERVERS.NET.      3600000      A     193.0.14.129
K.ROOT-SERVERS.NET.      3600000      AAAA  2001:7FD::1
;
; OPERATED BY ICANN
;
.                        3600000      NS    L.ROOT-SERVERS.NET.
L.ROOT-SERVERS.NET.      3600000      A     199.7.83.42
L.ROOT-SERVERS.NET.      3600000      AAAA  2001:500:3::42
;
; OPERATED BY WIDE
;
.                        3600000      NS    M.ROOT-SERVERS.NET.
M.ROOT-SERVERS.NET.      3600000      A     202.12.27.33
M.ROOT-SERVERS.NET.      3600000      AAAA  2001:DC3::35
; End of File


本主机DNS设置主DNS为192.168.0.1,就可以了,但对外网域名解析较慢,可以增加次DNS为210.47.176.1(具体地区的是有区别的,我这是辽宁的)。客户机DNS都设为192.168.0.1就可以了,当然你也可以设置客户机的次DNS为210.47.176.1,这样更稳妥些,不过解析速度不会快的。注意:要想访问内网网址,必须把192.168.0.1设为首选DNS服务器哦。。。

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