通过dig命令,验证域名查找流程
1、从全世界13个根域服务器查找
2、找到顶级域
3、找到权威服务器地址
4、找到三级域名的地址
yum install -y bind-utils
dig +trace www.yuchaoit.cn
; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.13 <<>> +trace www.yuchaoit.cn
;; global options: +cmd
. 3676 IN NS e.root-servers.net.
. 3676 IN NS f.root-servers.net.
. 3676 IN NS g.root-servers.net.
. 3676 IN NS h.root-servers.net.
. 3676 IN NS i.root-servers.net.
. 3676 IN NS j.root-servers.net.
. 3676 IN NS k.root-servers.net.
. 3676 IN NS l.root-servers.net.
. 3676 IN NS m.root-servers.net.
. 3676 IN NS a.root-servers.net.
. 3676 IN NS b.root-servers.net.
. 3676 IN NS c.root-servers.net.
. 3676 IN NS d.root-servers.net.
;; Received 239 bytes from 114.114.114.114#53(114.114.114.114) in 37 ms
cn. 172800 IN NS d.dns.cn.
cn. 172800 IN NS ns.cernet.net.
cn. 172800 IN NS a.dns.cn.
cn. 172800 IN NS c.dns.cn.
cn. 172800 IN NS b.dns.cn.
cn. 172800 IN NS e.dns.cn.
cn. 86400 IN DS 57724825D0423633EB24A499BE78AA22D1C0C9BA36218FF49FD95A4CDF1A4AD 97C67044
cn. 86400 IN RRSIG DS 8186400202308281700002023081516000011019 . abrLlG3+nmRfxOY4Nu0E6YJzv9gfOv9rt8VsRjt70d6un++7KwfWU7H7 RVDeDnesga29TnLV331ZObvPtOsm0KI1HjW/pXLlrMM/sqaMmUKI6wti JcooDty128NgFugR+9IKfXMze4bibdecfa4KIqx3xtfrNv/YXxMC658q VNeVIZDtlBzgWBEDpfAk/IU7nK+xRUCc/owWRiu+Ma9RDcQiYE+luZTB MItNf149AxPP9hWqNx/ZD+VSXa6B2yYoVq4b4ah/r1Gxp3VmNCfPYQUJ s5Boi5zIk6NWOXnpsAv3kr97K1SnK2PvBhhHkL/eY+juLvcykbwbuSex 9RhyQA==
;; Received 646 bytes from 192.33.4.12#53(c.root-servers.net) in 194 ms
yuchaoit.cn. 86400 IN NS net.dnspod.net.
yuchaoit.cn. 86400 IN NS tulip.dnspod.net.
3qdaqa092ee5belp64a74ebnb8j53d7e.cn. 21600 IN NSEC3 1110 AEF123AB 3QHKTF6LTFG8AAFUUAJSR8RVAJP99SFU NS SOA RRSIG DNSKEY NSEC3PARAM
3qdaqa092ee5belp64a74ebnb8j53d7e.cn. 21600 IN RRSIG NSEC3 8221600202308281355362023072913215338388 cn. G4Zn+Yq+4QHgBsi9ERXyfX+OenY8cBEWi1VCSjlCNYDUgd/45/dCNZwL LXuBMzaxl3F2MrZXaiDVRk05QvGG3UAG0G4WO6Bpkoca7at5V28lbOlx 0mBPdgyuWvP1zeuzN6tH7I+z+9ZmVRBh7GLKs+tMfhswMNGPCgGunju3 9l8=
qj2d47agkkdj0jba02ilnhbnvef3dqus.cn. 21600 IN NSEC3 1110 AEF123AB QJ9LHA246M7N0APT1UDRGTNF1VSSTDCF NS DS RRSIG
qj2d47agkkdj0jba02ilnhbnvef3dqus.cn. 21600 IN RRSIG NSEC3 8221600202308281359142023072913221038388 cn. nGwPo70MoGAQuc5oINz6orIMLqJJ4m7n+vAOIWN6sxV2ilaU6lsRP4NR +pKiL54B1R17eWqCcBxkBd2oCpdddU+MzYa+HPFzvUiGrY1gtOtooXyz 2kwVm2sQsEMe9MGbs3kLK6SnrPw6PQMTolHbNo4/oj+zPb4+l1uGsojm Pog=
;; Received 659 bytes from 203.119.25.1#53(a.dns.cn) in 32 ms
www.yuchaoit.cn. 600 IN A 82.157.248.168
yuchaoit.cn. 86400 IN NS tulip.dnspod.net.
yuchaoit.cn. 86400 IN NS net.dnspod.net.
;; Received 118 bytes from 129.211.176.239#53(tulip.dnspod.net) in 35 ms
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