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                nslookup命令主要用來查詢域名的DNS信息。 nslookup擁有“交互模式”和“非交互模式”。在“交互模式”下,用戶可以向域名服務器查詢各類主機、域名的信息,或者輸出域名中的主機列表。而在“非交互模式”下,用戶可以針對一個主機或域名來查詢對應的信息. >**交互模式:** 僅輸入nslookup命令,不加任何參數,即可直接進入交互模式,此時nslookup會連接到默認的域名服務器(即`/etc/resolv.conf`的第一個dns地址)。或者輸入`nslookup -nameserver/ip`。 >**非交互模式:** 直接輸入`nslookup 域名`。 > **命令格式:** nslookup \[參數\] \[域名\] > **option:** > * -sil :不顯示任何警告信息 > * exit:退出命令 > * server:指定解析域名的服務器地址 > * set type=soa:設置查詢域名授權起始信息 > * set type=a:設置查詢域名A記錄 > * set type=mx:設置查詢域名郵件交換記錄 **安裝:** yum search nslookup沒找到對應的安裝包 使用命令`yum? provides? */nslookup`?? 就可以找到提供nslookup命令的軟件包了:**bind-utils** 安裝命令:`yum install -y bind-utils` ``` [root@izwz91quxhnlkan8kjak5hz ~]# yum provides */nslookup 已加載插件:fastestmirror Loading mirror speeds from cached hostfile base/7/x86_64/filelists_db | 7.2 MB 00:00:00 epel/x86_64/filelists_db | 12 MB 00:00:00 extras/7/x86_64/filelists_db | 224 kB 00:00:00 updates/7/x86_64/filelists_db | 2.1 MB 00:00:00 1:bash-completion-extras-2.1-11.el7.noarch : Additional programmable completions for Bash 源 :epel 匹配來源: 文件名 :/usr/share/bash-completion/completions/nslookup 32:bind-utils-9.11.4-26.P2.el7.x86_64 : Utilities for querying DNS name servers 源 :base 匹配來源: 文件名 :/usr/bin/nslookup 32:bind-utils-9.11.4-26.P2.el7_9.2.x86_64 : Utilities for querying DNS name servers 源 :updates 匹配來源: 文件名 :/usr/bin/nslookup zsh-5.0.2-34.el7_8.2.x86_64 : Powerful interactive shell 源 :base 匹配來源: 文件名 :/usr/share/zsh/5.0.2/functions/nslookup ``` **實例:** ``` // 交互模式下,查看www.baidu.com的域名DNS信息 [root@izwz91quxhnlkan8kjak5hz ~]# nslookup > set type=soa > www.baidu.com Server: 100.100.2.138 Address: 100.100.2.138#53 Non-authoritative answer: www.baidu.com canonical name = www.a.shifen.com. Authoritative answers can be found from: a.shifen.com origin = ns1.a.shifen.com mail addr = baidu_dns_master.baidu.com serial = 2101090002 refresh = 5 retry = 5 expire = 2592000 minimum = 3600 > server www.baidu.com Default server: www.baidu.com Address: 14.215.177.39#53 Default server: www.baidu.com Address: 14.215.177.38#53 > //非交互模式下,查看www.baidu.com的域名DNS信息 [root@izwz91quxhnlkan8kjak5hz ~]# nslookup www.baidu.com Server: 100.100.2.138 Address: 100.100.2.138#53 Non-authoritative answer: www.baidu.com canonical name = www.a.shifen.com. Name: www.a.shifen.com Address: 14.215.177.38 Name: www.a.shifen.com Address: 14.215.177.39 [root@izwz91quxhnlkan8kjak5hz ~]# ```
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