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用于排除DNS(域名服务器)故障的Linux Nslookup命令整理

Nslookup是一个命令行管理工具,用于对DNS服务器(域名服务器)进行测试和故障排除,它也用于查询特定的DNS资源记录 ( RR )。目前大多数操作系统都带有内置的Nslookup功能。

本文将简单介绍广泛使用的Nslookup命令。据悉,Nslookup可以在两种模式下运行:交互式和非交互式。交互模式用于向DNS-Server查询各种域名和主机,而非交互模式用于查询域或主机的信息。

Linux Nslookup命令整理

1、找出域名的“A”记录(IP地址)

# nslookup yahoo.com

Server:         4.2.2.2
Address:        4.2.2.2#53

Non-authoritative answer:
Name:   yahoo.com
Address: 72.30.38.140
Name:   yahoo.com
Address: 98.139.183.24
Name:   yahoo.com
Address: 209.191.122.70

上面的命令查询域www.yahoo.com4.2.2.2公共DNS服务器和下面的部分显示Non-authoritative answer:显示www.yahoo.com的A记录

2、找出反向域名Lookup

# nslookup 209.191.122.70

Server:         4.2.2.2
Address:        4.2.2.2#53

Non-authoritative answer:
70.122.191.209.in-addr.arpa     name = ir1.fp.vip.mud.yahoo.com.

Authoritative answers can be found from:

3、找出特定的域名Lookup

# nslookup ir1.fp.vip.mud.yahoo.com.

Server:         4.2.2.2
Address:        4.2.2.2#53

Non-authoritative answer:
Name:   ir1.fp.vip.mud.yahoo.com
Address: 209.191.122.70

4、查询MX(邮件交换)记录

# nslookup -query=mx www.yahoo.com

Server:         4.2.2.2
Address:        4.2.2.2#53

Non-authoritative answer:
www.yahoo.com   canonical name = fd-fp3.wg1.b.yahoo.com.
fd-fp3.wg1.b.yahoo.com  canonical name = ds-fp3.wg1.b.yahoo.com.
ds-fp3.wg1.b.yahoo.com  canonical name = ds-any-fp3-lfb.wa1.b.yahoo.com.
ds-any-fp3-lfb.wa1.b.yahoo.com  canonical name = ds-any-fp3-real.wa1.b.yahoo.com.

Authoritative answers can be found from:
wa1.b.yahoo.com
        origin = yf1.yahoo.com
        mail addr = hostmaster.yahoo-inc.com
        serial = 1344827307
        refresh = 30
        retry = 30
        expire = 86400
        minimum = 1800

MX记录用于将域名映射到该域的邮件交换服务器列表,这样它就可以告诉任何接收/发送到@yahoo.com的邮件都将被路由到邮件服务器。

5、查询NS(Name Server)记录

# nslookup -query=ns www.yahoo.com

Server:         4.2.2.2
Address:        4.2.2.2#53

Non-authoritative answer:
www.yahoo.com   canonical name = fd-fp3.wg1.b.yahoo.com.
fd-fp3.wg1.b.yahoo.com  canonical name = ds-fp3.wg1.b.yahoo.com.
ds-fp3.wg1.b.yahoo.com  canonical name = ds-any-fp3-lfb.wa1.b.yahoo.com.
ds-any-fp3-lfb.wa1.b.yahoo.com  canonical name = ds-any-fp3-real.wa1.b.yahoo.com.

Authoritative answers can be found from:
wa1.b.yahoo.com
        origin = yf1.yahoo.com
        mail addr = hostmaster.yahoo-inc.com
        serial = 1344827782
        refresh = 30
        retry = 30
        expire = 86400
        minimum = 1800

6、查询SOA(Start of Authority)记录

# nslookup -type=soa www.yahoo.com

Server:         4.2.2.2
Address:        4.2.2.2#53

Non-authoritative answer:
www.yahoo.com   canonical name = fd-fp3.wg1.b.yahoo.com.
fd-fp3.wg1.b.yahoo.com  canonical name = ds-fp3.wg1.b.yahoo.com.
ds-fp3.wg1.b.yahoo.com  canonical name = ds-any-fp3-lfb.wa1.b.yahoo.com.
ds-any-fp3-lfb.wa1.b.yahoo.com  canonical name = ds-any-fp3-real.wa1.b.yahoo.com.

Authoritative answers can be found from:
wa1.b.yahoo.com
        origin = yf1.yahoo.com
        mail addr = hostmaster.yahoo-inc.com
        serial = 1344827965
        refresh = 30
        retry = 30
        expire = 86400
        minimum = 1800

7、查询所有可用的DNS记录

# nslookup -query=any yahoo.com

Server:         4.2.2.2
Address:        4.2.2.2#53

Non-authoritative answer:
yahoo.com
        origin = ns1.yahoo.com
        mail addr = hostmaster.yahoo-inc.com
        serial = 2012081016
        refresh = 3600
        retry = 300
        expire = 1814400
        minimum = 600
Name:   yahoo.com
Address: 98.139.183.24
Name:   yahoo.com
Address: 209.191.122.70
Name:   yahoo.com
Address: 72.30.38.140
yahoo.com       mail exchanger = 1 mta7.am0.yahoodns.net.
yahoo.com       mail exchanger = 1 mta5.am0.yahoodns.net.
yahoo.com       mail exchanger = 1 mta6.am0.yahoodns.net.
yahoo.com       nameserver = ns3.yahoo.com.
yahoo.com       nameserver = ns4.yahoo.com.
yahoo.com       nameserver = ns2.yahoo.com.
yahoo.com       nameserver = ns8.yahoo.com.
yahoo.com       nameserver = ns1.yahoo.com.
yahoo.com       nameserver = ns6.yahoo.com.
yahoo.com       nameserver = ns5.yahoo.com.

Authoritative answers can be found from:

8、启用调试模式

要启用调试模式,’set debug’ 将返回详细信息,如TTL,以下是输出结果:

# nslookup -debug yahoo.com

> set debug
> yahoo.com
Server:         4.2.2.2
Address:        4.2.2.2#53

------------
    QUESTIONS:
        yahoo.com, type = A, class = IN
    ANSWERS:
    ->  yahoo.com
        internet address = 72.30.38.140
        ttl = 1523
    ->  yahoo.com
        internet address = 98.139.183.24
        ttl = 1523
    ->  yahoo.com
        internet address = 209.191.122.70
        ttl = 1523
    AUTHORITY RECORDS:
    ADDITIONAL RECORDS:
------------
Non-authoritative answer:
Name:   yahoo.com
Address: 72.30.38.140
Name:   yahoo.com
Address: 98.139.183.24
Name:   yahoo.com
Address: 209.191.122.70

总结

在以上内容中,小编简单介绍了Nslookup基本命令的使用方法,这些命令可以帮助你搜索 ( DNS ) 域名服务相关信息。

当然,上述以雅虎域名为例进行演示,大家可以自行换成想要查询的域名或IP地址。上述Nslookup基本命令演示仅供参考,有任何问题欢迎交流讨论。

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