DNS服务

1.查看

nslookup（需要安装）

[root@admin yum.repos.d]# yum install bind-utils -y
[root@admin yum.repos.d]# nslookup www.baidu.com
Server:		114.114.114.114
Address:	114.114.114.114#53

Non-authoritative answer:
www.baidu.com	canonical name = www.a.shifen.com.
Name:	www.a.shifen.com
Address: 110.242.68.4
Name:	www.a.shifen.com
Address: 110.242.68.3

或者用ping：

[root@admin yum.repos.d]# ping www.baidu.com
PING www.a.shifen.com (110.242.68.4) 56(84) bytes of data.
64 bytes from 110.242.68.4 (110.242.68.4): icmp_seq=1 ttl=128 time=28.4 ms
64 bytes from 110.242.68.4 (110.242.68.4): icmp_seq=2 ttl=128 time=31.3 ms
64 bytes from 110.242.68.4 (110.242.68.4): icmp_seq=3 ttl=128 time=32.1 ms
64 bytes from 110.242.68.4 (110.242.68.4): icmp_seq=4 ttl=128 time=37.3 ms
^C
--- www.a.shifen.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3023ms
rtt min/avg/max/mdev = 28.468/32.315/37.313/3.198 ms

2.dns配置文件

1.Linux本地的dns解析文件：/etc/hosts。这是运维人员自由定义域名和IP 之间的强制对应关系的；

可以认为是本地的域名——ip对应关系。

[root@admin yum.repos.d]# vim /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
10.0.0.111 mon01.linux.io  stor01.linux.io    mon01   stor01
10.0.0.112 mon02