DNS を 15 分で雑に知る / grasp DNS in 15 minutes

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A www.example.com. A 93.184.216.34

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www.example.com. . com example www www.example.com. com. com. www.example.com. example.com. example.com. www.example.com. www.example.com. A

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a.b.c.example.com. a.b.c.example.com. com. a.b.c.example.com. example.com. a.b.c.example.com. A

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$ dig +trace www.example.com. ( ) . 13770 IN NS b.root-servers.net. . 13770 IN NS l.root-servers.net. ( ) com. 172800 IN NS a.gtld-servers.net. com. 172800 IN NS b.gtld-servers.net. ( ) example.com. 172800 IN NS a.iana-servers.net. example.com. 172800 IN NS b.iana-servers.net. ( ) www.example.com. 86400 IN A 93.184.216.34 ( ) NS A

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. 13770 IN NS b.root-servers.net. com. 172800 IN NS a.gtld-servers.net. example.com. 172800 IN NS b.iana-servers.net. www.example.com. 86400 IN A 93.184.216.34 13770 172800 172800 86400 NS example.com.

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8.8.8.8 " " dig +trace

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ec2.us-east-1.amazonaws.com

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.com example.com. example example

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% grep search /etc/resolv.conf search example.com ※

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/etc/resolv.conf mount mount /dev/sda1 on /etc/resolv.conf type ext4

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8.8.8.8

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resolv.conf resolv.conf

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resolv.conf resolv.conf resolv.conf

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ALIAS A AAAA ALIAS CNAME ALIAS CNAME

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/ . host "fully qualified domain name"