dns: linux中 dns 相关的工具

nslookup [-option] [name | -] [server]

$ nslookup -query=srv etcd.lijiaob.svc.cluster.local 10.0.0.10
Server:		10.0.0.10
Address:	10.0.0.10#53

etcd.lijiaob.svc.cluster.local	service = 10 33 0 etcd-2.etcd.lijiaob.svc.cluster.local.
etcd.lijiaob.svc.cluster.local	service = 10 33 0 etcd-0.etcd.lijiaob.svc.cluster.local.
etcd.lijiaob.svc.cluster.local	service = 10 33 0 etcd-1.etcd.lijiaob.svc.cluster.local.

sh-4.2# nslookup 
> server 10.0.0.10                  <--设置默认的dns服务器
Default server: 10.0.0.10
Address: 10.0.0.10#53
> set q=srv                         <-- 设置查询的类型
> etcd.lijiaob.svc.cluster.local    <-- 设置查询的名称
Server:		10.0.0.10
Address:	10.0.0.10#53

etcd.lijiaob.svc.cluster.local	service = 10 33 0 etcd-2.etcd.lijiaob.svc.cluster.local.
etcd.lijiaob.svc.cluster.local	service = 10 33 0 etcd-0.etcd.lijiaob.svc.cluster.local.
etcd.lijiaob.svc.cluster.local	service = 10 33 0 etcd-1.etcd.lijiaob.svc.cluster.local.

host [server]
          Look up information for host using the current default server or using server, if specified. If host is an Internet address and the query type is A or PTR, the name of the host is
          returned. If host is a name and does not have a trailing period, the search list is used to qualify the name.
          To look up a host not in the current domain, append a period to the name.

server domain
lserver domain
    Change the default server to domain; lserver uses the initial server to look up information about domain, while server uses the current default server. If an authoritative answer can't be
    found, the names of servers that might have the answer are returned.

root
    not implemented

finger
    not implemented
...

dig @NAMESERVER DOMAIN-NAME

$dig @114.114.114.114 www.baidu.com

; <<>> DiG 9.8.3-P1 <<>> @114.114.114.114 www.baidu.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6758
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0

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

;; ANSWER SECTION:
www.baidu.com.		463	IN	CNAME	www.a.shifen.com.
www.a.shifen.com.	141	IN	A	61.135.169.125
www.a.shifen.com.	141	IN	A	61.135.169.121

;; Query time: 18 msec
;; SERVER: 114.114.114.114#53(114.114.114.114)
;; WHEN: Wed Aug  2 18:59:47 2017
;; MSG SIZE  rcvd: 90