dns: linux中 dns 相关的工具
目录
nslookup
手册man nslookup：
nslookup [-option] [name | -] [server]
非交互式查询
查询类型为srv，dns服务器为10.0.0.10，要查询的域名是etcd.lijiaob.svc.cluster.local。
$ 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.
交互式查询
也可以使用交互式查询，
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.
交互式模式下，支持很多命令，可以在man nslookup手册中查看：
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
域名查询:
dig @NAMESERVER DOMAIN-NAME
example:
$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
