Linux bind-utils
一、简介

DNS是一种将域名解析为IP地址的服务.如:www.turbolinux.com.cn通过DNS解析,可以得到210.77.38.126.
bind是linux系统下的一个DNS服务程序.bind-utils是bind软件提供的一组DNS工具包,里面有一些DNS相关的工具.主要有:dig,host,nslookup,nsupdate.使用这些工具可以进行域名解析和DNS调试工作.

二、bind-utils的安装

1.yum方式安装
[root@zabbix-server ~]# yum install bind-utils -y
[root@zabbix-server ~]# nslookup www.baidu.com
Server: 10.41.7.13
Address: 10.41.7.13#53

Non-authoritative answer:
www.baidu.com canonical name = www.a.shifen.com.
Name: www.a.shifen.com
Address: 61.135.169.125
Name: www.a.shifen.com
Address: 61.135.169.121
[root@zabbix-server ~]# host www.baidu.com
www.baidu.com is an alias for www.a.shifen.com.
www.a.shifen.com has address 61.135.169.121
www.a.shifen.com has address 61.135.169.125
[root@zabbix-server ~]# dig www.baidu.com

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.68.rc1.el6 <<>> www.baidu.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50791
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.baidu.com. IN A

;; ANSWER SECTION:
www.baidu.com. 1153 IN CNAME www.a.shifen.com.
www.a.shifen.com. 257 IN A 61.135.169.121
www.a.shifen.com. 257 IN A 61.135.169.125

;; Query time: 4 msec
;; SERVER: 10.41.7.13#53(10.41.7.13)
;; WHEN: Tue Jul 31 16:18:43 2018
;; MSG SIZE rcvd: 90