从OEL5中启动简单的dns服务

在OEL5中，有一个 dnsmasq，可以适合小型的实验性的dns设置。

如果可以看到类似如下的内容，说明dnsmasq已经设置好了。

[root@dnssvr ~]# rpm -qa dnsmasq
dnsmasq-2.45-1.1.el5_3
[root@dnssvr ~]# 

然后，可以设置dns解析的内容：

[root@dnssvr ~]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1       dnssvr.gao dnssvr       localhost.localdomain localhost
#::1            localhost.localdomain localhost

192.168.56.201 scan.oracle11g.jp scan
192.168.56.202 scan.oracle11g.jp scan
192.168.56.203 scan.oracle11g.jp scan

[root@dnssvr ~]# 

然后，启动dns服务：

[root@dnssvr ~]# service dnsmasq status
dnsmasq is stopped
[root@dnssvr ~]# service dnsmasq start
Starting dnsmasq:                                          [  OK  ]
[root@dnssvr ~]# service dnsmasq status
dnsmasq (pid  3045) is running...
[root@dnssvr ~]# 

此时，客户端作如下配置：

[root@dnscl etc]# cat /etc/resolv.conf
nameserver 10.20.20.1
[root@dnscl etc]# 

其中，10.20.20.1 是前面运行dns服务的机器的IP 地址。

实际测试：

[root@dnscl etc]# nslookup scan.oracle11g.jp
Server:         10.20.20.1
Address:        10.20.20.1#53

Name:   scan.oracle11g.jp
Address: 192.168.56.203
Name:   scan.oracle11g.jp
Address: 192.168.56.201
Name:   scan.oracle11g.jp
Address: 192.168.56.202

[root@dnscl etc]# nslookup scan.oracle11g.jp
Server:         10.20.20.1
Address:        10.20.20.1#53

Name:   scan.oracle11g.jp
Address: 192.168.56.201
Name:   scan.oracle11g.jp
Address: 192.168.56.202
Name:   scan.oracle11g.jp
Address: 192.168.56.203

[root@dnscl etc]# 

简易的DNS已经成功设置。