DNSについて理解を深める

『DNSについて理解を深める』勉強会用スライド。※本資料に記述された見解は私個人の見解であり、所属する会社＆組織の見解を必ずしも反映したものではありません。ご了承ください。

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1. 2020/01/09 DNSについて理解を深める
2. DNS
3. DNS • - IP - - DNS • - - IP • OCI - - Internet and VCN Resolver - Internet and VCN Resolver /etc/resolv.conf nameserver 169.254.169.254 DNS • • DNS • IP DNS • IP • • DNS • • • Agenda
4. IP DNS 192.168.10.8 https://www. .com DNS http://www. .com IP
5. IP DNS HOSTS.TXT(hosts ) IP #Internet Address official host name alias # (IP ) ( ) ( ) 127.0.0.1 localhost 192.0.2.1 library 192.0.2.2 work1 office01 https://jprs.jp/glossary/index.php?ID=0199
6. DNS …… …… …
7. DNS DNS SLD TLD • •
8. 150.0.0.1 . .jp .com .jp IP hint IP .jp 400 NS ns.jp ns.jp 400 A 10.0.5.1 10.0.5.1 10.0.5.2 test.jp IP test.jp 400 A 150.0.0.1 test.jp IP A IP test.jp 150.0.0.1 150.0.0.1
9. (TTL)
10. . .jp 10.0.5.1 test.jp 400 A 150.0.0.1 test.jp 150.0.0.1 …… …… .jp 400 NS ns.jp ns.jp 400 A 10.0.5.1
11. IP DNS IP IP 150.10.1.1
12. DNS 150.10.1.1 150.10.1.2 (150.10.1.1) (150.10.1.2)
13. DNS DNS (B ) (A ) 150.10.1.1 DNS IP DNS DNS DNS
14. DNS (A ) . 150.10.1.1 IP https://jprs.jp/glossary/index.php?ID=0183
15. IP DNS (A ) . 150.10.1.1 129.213.65.50 . 129.213.65.50 (B ) 130.10.1.1 1 2
16. OCI (DNS ) 2 Internet and VCN Resolver • • 2 - - VCN Custom Resolver • - - OCI - VPN FascConnect OnP DNS OCI
17. Internet and VCN Resolver DNS OCI OCI (169.254.0.0) Region VCN Subnet Internet and VCN Resolver 169.254.169.254 Internet
18. Internet and VCN Resolver /etc/resolv.conf nameserver 169.254.169.254 DNS OCI [opc@instance ~]$ cat /etc/resolv.conf ; Any changes made to this file will be overwritten whenever the ; DHCP lease is renewed. To persist changes you must update the ; /etc/oci-hostname.conf file. For more information see ;[https://docs.cloud.oracle.com/iaas/Content/Network/Tasks/managingDHCP.htm#notes] ; ; generated by /usr/sbin/dhclient-script search jupyter.oraclevcn.com jupytersubnet.jupyter.oraclevcn.com nameserver 169.254.169.254
19. DNS • • • • • Nagios Nagios https://www.atmarkit.co.jp/fnetwork/tokusyuu/22tool/gamenL.jpg
20. DNS • • • • DNS Status Collector(DSC) DSC https://dnsops.jp/event/20120831/dns-troubleshoot-2.pdf