<![CDATA[向东博客专注WEB应用构架之美 --- 构架之美，在于尽态极妍

<![CDATA[向东博客专注WEB应用构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除]]> http://jackxiang.com/index.php zh-cn http://jackxiang.com/post// <![CDATA[[实践OK]nslookup调试输出命令-debug及其发现接口慢的原因是DNS查询慢引起，及用nslookup 查看域名对应的IP地址，查看域名的Dns，及修改某个域名访问的Dns服务器名]]> jack <xdy108@126.com> Tue, 02 Mar 2010 13:32:15 +0000 http://jackxiang.com/post// /# nslookup -debug time.geekbang.org
第一步：
time curl "http://api.jackxiang.com/video/getUUID?client_id=100&format=json"
real    0m2.288s
user    0m0.001s
sys     0m0.001s

第二步：
tracert api.jackxiang.com
河南郑州到北京市北京市鹏博士宽带的DNS查询很慢
估计是dns解析慢，于是直接访问IP试一试，发现很快。

nslookup   api.jackxiang.com
[root@wh-appserver413 201512]# nslookup
> Set type=any
> api.jackxiang.com
Server:         115.182.119.202
Address:        115.182.119.20#53

Non-authoritative answer:
Name:   api.jackxiang.com
Address: 115.182.9.212
根据DNS服务器的IP查是不是和服务器一样的是电信，发现不是（一个在河南省郑州市联通骨干节点联通，一个在北京联通。）：
您查询的IP:202.106.0.20
本站主数据：北京市北京市联通
参考数据一：北京市联通
网友提交的IP：北京市联通DNS服务器

第三步：
[root@wh-appserver413 201512]# time curl -H"Host:api.jackxiang.com" "http://115.182.119.202/video/getUUID?client_id=100&format=json"
{"status":"success","data":{"uuid":"94a8a1d6-0668-429b-807c-81e12cd0ca08"}}
real    0m0.052s
user    0m0.000s
sys     0m0.003s

也就是说河南省郑州市联通骨干节点联通到北京联通的DNS查询太慢引起的。
________________________________________________________________________

C:\Documents and Settings\jackxiang>nslookup xxy.qq.com
Server:  gm-captiva.tencent.com
Address:  10.6.18.41

Non-authoritative answer:
Name:    xxy.qq.com
Address:  119.147.78.140

前面两行是您电脑所使用的DNS服务器名及其IP地址!
Web版本查询：http://tool.chinaz.com/nslookup/

$ nslookup
Default Server:   ns.hazzptt.net.cn
Address:   202.102.224.68

查询域名解释服务器
> set type=ns
> yahoo.com

Server:   ns.hazzptt.net.cn
Address:   202.102.224.68

Non-authoritative answer:

yahoo.com        nameserver = NS2.DCA.yahoo.com
yahoo.com        nameserver = NS5.DCX.yahoo.com
yahoo.com        nameserver = NS.EUROPE.yahoo.com
yahoo.com        nameserver = NS1.yahoo.com

Authoritative answers can be found from:
NS2.DCA.yahoo.com        internet address = 209.143.200.34
NS5.DCX.yahoo.com        internet address = 216.32.74.10
NS.EUROPE.yahoo.com      internet address = 195.67.49.25
NS1.yahoo.com    internet address = 204.71.200.33

查询邮件交换记录
>set type=mx
> 21cn.com
Server:   ns.hazzptt.net.cn

Address:   202.102.224.68
Non-authoritative answer:
21cn.com        MX preference = 10, mail exchanger = mta.21cn.com

mta.21cn.com    internet address = 59.36.102.53
mta.21cn.com    internet address = 59.36.102.54
mta.21cn.com    internet address = 59.36.102.55
mta.21cn.com    internet address = 59.36.102.56
mta.21cn.com    internet address = 59.36.102.57
mta.21cn.com    internet address = 59.36.102.58
mta.21cn.com    internet address = 59.36.102.50
mta.21cn.com    internet address = 59.36.102.51
mta.21cn.com    internet address = 59.36.102.52

> gmail.com
Server:   ns.hazzptt.net.cn

Address:   202.102.224.68

Non-authoritative answer:
gmail.com       MX preference = 10, mail exchanger = alt1.gmail-smtp-in.l.googl.com
gmail.com       MX preference = 10, mail exchanger = alt2.gmail-smtp-in.l.googl.com
gmail.com       MX preference = 50, mail exchanger = gsmtp147.google.com
gmail.com       MX preference = 50, mail exchanger = gsmtp183.google.com
gmail.com       MX preference = 5, mail exchanger = gmail-smtp-in.l.google.com

alt2.gmail-smtp-in.l.google.com internet address = 216.239.59.27
gsmtp147.google.com     internet address = 209.185.147.27
gsmtp183.google.com     internet address = 64.233.183.27
gmail-smtp-in.l.google.com      internet address = 209.85.143.114
gmail-smtp-in.l.google.com      internet address = 209.85.143.27
alt1.gmail-smtp-in.l.google.com internet address = 64.233.185.27
alt1.gmail-smtp-in.l.google.com internet address = 64.233.185.114
>

以上例子就使用nslookup来查询yahoo.com这个zone的名字服务器，需要将类型设置为ns来执行查询，使用类型设置为mx查询你的邮件交换记录。用来帮助获得DNS数据的工具还有很多，如dig能迅速返回整个zone的名字解析数据，dnswalk可以用来帮助查询名字服务器的设置。这些工具都可以用来帮助查找DNS的设置问题。

2）查看域名对应的Dns命令：

C:\Documents and Settings\jackxiang>nslookup -qt=ns jackxiang.com
DNS request timed out.
    timeout was 2 seconds.
*** Can't find server name for address 10.6.18.41: Timed out
Server:  gm-enclave.tencent.com
Address:  10.6.18.42

Non-authoritative answer:
jackxiang.com    nameserver = f1g1ns1.dnspod.net
jackxiang.com    nameserver = f1g1ns2.dnspod.net

f1g1ns1.dnspod.net      internet address = 119.167.195.6
f1g1ns1.dnspod.net      internet address = 122.225.217.192
f1g1ns1.dnspod.net      internet address = 180.153.10.150
f1g1ns1.dnspod.net      internet address = 183.60.52.217
f1g1ns2.dnspod.net      internet address = 180.153.162.150
f1g1ns2.dnspod.net      internet address = 112.90.143.29
f1g1ns2.dnspod.net      internet address = 122.225.217.191
f1g1ns2.dnspod.net      internet address = 180.153.10.151

简单的访问：
C:\Documents and Settings\jackxiang>nslookup jackxiang.com
Server:  gm-captiva.tencent.com
Address:  10.6.18.41

Non-authoritative answer:
Name:    jackxiang.com
Address:  116.255.139.240

3）修改访问域名的Dns服务器：

解释：
server dns_server_ip，表示将内定的 local DNS 换成另一部 server ]]> http://jackxiang.com/post//#blogcomment <![CDATA[[评论] [实践OK]nslookup调试输出命令-debug及其发现接口慢的原因是DNS查询慢引起，及用nslookup 查看域名对应的IP地址，查看域名的Dns，及修改某个域名访问的Dns服务器名]]> <user@domain.com> Thu, 01 Jan 1970 00:00:00 +0000 http://jackxiang.com/post//#blogcomment