域名解析命令

域名解析命令)

域名解析命令

host ping nslookup dig /etc/hosts /etc/resolve.conf

host 域名解析

[root@wen etc]# host www.baidu.com
www.baidu.com is an alias for www.a.shifen.com.
www.a.shifen.com has address 220.181.111.148
www.a.shifen.com has address 220.181.112.143

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ping 测试网络通达性能

[root@wen etc]# ping 10.0.0.254
PING 10.0.0.254 (10.0.0.254) 56(84) bytes of data.
64 bytes from 10.0.0.254: icmp_seq=1 ttl=64 time=0.379 ms
^C
— 10.0.0.254 ping statistics —
1 packets transmitted, 1 received, 0% packet loss, time 998ms
rtt min/avg/max/mdev = 0.379/0.379/0.379/0.000 ms

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nslookup 类似host的域名解析的命令

[root@dut 桌面]# nslookup
www.baidu.com
Server: 8.8.8.8
Address: 8.8.8.8#53

Non-authoritative answer:
www.baidu.com canonical name = www.a.shifen.com.
Name: www.a.shifen.com
Address: 115.239.210.26
Name: www.a.shifen.com
Address: 115.239.210.27

dig 用法和host一样

[root@dut 桌面]# dig www.baidu.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6 <<>> www.baidu.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12244
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.baidu.com. IN A
;; ANSWER SECTION:
www.baidu.com. 64 IN CNAME www.a.shifen.com.
www.a.shifen.com. 15675 IN A 115.239.210.26
www.a.shifen.com. 15675 IN A 115.239.210.27
;; Query time: 3 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Sep 14 08:59:12 2013
;; MSG SIZE rcvd: 90

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/etc/hosts 本地域名解析,优先级最高，速度最快

[root@dut ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
10.0.2.213 localhost

/etc/resolv.conf DNS域名解析的服务器（最多可以设置3个，解析域名是按照从上到下的顺序开始的）

[root@dut ~]# cat /etc/resolv.conf
#Generated by NetworkManager
#nameserver 8.8.8.8
nameserver 8.8.8.8
如果在/etc/sysconfig/network-script/ifcfg-eth0
中PREEDNS一项中设置的是yes，这个resolv.conf会被自动覆盖

文章出处：https://blog.csdn.net/mycosmos/article/details/13045205