Centos7 搭建DNS服務器

企業內眾多服務器在使用過程中全部使用ip地址，難免記混，搭建一個企業內dns服務器即刻解決。

測試環境和線上環境相應的域名信息可以保持一致，這樣避免更改任何測試好的配置，直接上線。

#1.安裝bind軟件

yum install bind -y

[root@localhost named]# vi /etc/named.conf 
//
// named.conf
//
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS
// server as a caching only nameserver (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//
// See the BIND Administrator's Reference Manual (ARM) for details about the
// configuration located in /usr/share/doc/bind-{version}/Bv9ARM.html

options {
	listen-on port 53 { 192.168.1.7; };
	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";
	recursing-file  "/var/named/data/named.recursing";
	secroots-file   "/var/named/data/named.secroots";
	allow-query     { any; };

	/* 
	 - If you are building an AUTHORITATIVE DNS server, do NOT enable recursion.
	 - If you are building a RECURSIVE (caching) DNS server, you need to enable 
	   recursion. 
	 - If your recursive DNS server has a public IP address, you MUST enable access 
	   control to limit queries to your legitimate users. Failing to do so will
	   cause your server to become part of large scale DNS amplification 
	   attacks. Implementing BCP38 within your network would greatly
	   reduce such attack surface 
	*/
	recursion yes;

	dnssec-enable yes;
	dnssec-validation yes;

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

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

[root@localhost named]# 

 

vi /etc/named.rfc1912.zones

在最后加上：

//正向區域配置
zone "xiaochangwei.com" IN {
    type master;
    file "xiaochangwei.com.zone";
    allow-update { none; };
};

//反向區域配置
zone "1.168.192.in-addr.arpa" IN {
    type master;
    file "xiaochangwei.com.local";
    allow-update { none; };
};

 進入/var/named

cp -p named.empty xiaochangwei.com.zone

 

vi xiaochangwei.com.zone

$TTL 1D
@    IN SOA    @ rname.invalid. (
                    0    ; serial
                    1D    ; refresh
                    1H    ; retry
                    1W    ; expire
                    3H )    ; minimum
    NS    @
    A    192.168.1.7

www IN A 192.168.1.6
ftp IN A 192.168.1.6
mail IN CNAME www

 

vi xiaochangwei.com.local

$TTL 1D
@    IN SOA    @ rname.invalid. (
                    0    ; serial
                    1D    ; refresh
                    1H    ; retry
                    1W    ; expire
                    3H )    ; minimum
    NS    @
    A    192.168.1.7
6 IN PTR www.xiaochangwei.com.  #最前面的6代表ip的最后一位，因為在named.rfc1912.zones反向配置中，倒敘配置了ip前三位，所以這里就相當於說192.168.1.6解析到www.xiaochangwei.com這個域名
9 IN PTR www.zycloud.info.　　　 #同理，192.168.1.9就會解析到 www.zycloud.info這個域名。 注意域名后面有個點，不能省略

 

systemctl restart named
systemctl enable named

 

換一台電腦DNS設置為DNS服務器地址（192.168.1.7）

[root@1-5 ~]# nslookup ftp.xiaochangwei.com
Server:        192.168.1.7
Address:    192.168.1.7#53

Name:    ftp.xiaochangwei.com
Address: 192.168.1.6

[root@1-5 ~]# 
[root@1-5 ~]# nslookup www.xiaochangwei.com
Server:        192.168.1.7
Address:    192.168.1.7#53

Name:    www.xiaochangwei.com
Address: 192.168.1.6

[root@1-5 ~]# 

若提示nslookup沒安裝，執行下面命令進行安裝

yum install bind-utils -y

[root@1-5 ~]# nslookup 192.168.1.6
6.1.168.192.in-addr.arpa    name = www.xiaochangwei.com.

[root@1-5 ~]# 

 

 需要注意的是：配置客戶機的DNS的時候不要在 /etc/resolv.conf中配置，不然重啟后會被覆蓋，

 應該在/etc/sysconfig/network-scripts/ifcfg-*中配置，啟動的時候會自動生成到resolv.conf中的

[root@1-5 ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens33 |grep DNS
DNS1=192.168.1.7
[root@1-5 ~]#