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Ubuntu 18.04 DNS
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netplan
 :: Ubuntu 17.10 ¿¡¼­ºÎÅÍ »ý±ä ³×Æ®¿öÅ© ¼³Á¤ ½Ã½ºÅÛ (systemd-networkd Á¦¾î)

https://wiki.ubuntu.com/ArtfulAardvark/ReleaseNotes

Network configuration
ifupdown has been deprecated in favor of netplan and is no longer present on new installs. The installer will generate a configuration file for netplan in /etc/netplan, which will set up the system to configure the network via systemd-networkd or NetworkManager. Desktop users will see their system fully managed via NetworkManager as it has been the case in previous releases, but Server users now have their network devices managed via systemd-networkd on new installs. This only applies to new installations.

Given that ifupdown is no longer installed by default, its commands will not be present: ifup and ifdown are thus unavailable, replaced by ip link set $device up and ip link set $device down.

The networkctl command is also available for users to see a summary of the network devices. networkctl status will display the current global state of IP addresses on the system; and networkctl status $device can display the details specific to a network device.

For more information about netplan, please refer to the manual page using the man 5 netplan command.
netplan generate : /etc/netplan¿¡ renderer¿¡ ´ëÇÑ ±¸¼ºµéÀ» »ý¼º
netplan apply : renderer¿¡ ´ëÇÑ ±¸¼ºµéÀ» Àû¿ëÇÏ°í Àç½ÃÀÛ
netplan ifupdown-migrate : /etc/network/interfacesÀÇ ³»¿ëÀ» ¸¶À̱׷¹À̼Ç
¾Æ·¡ ÆÄÀÏÀ§Ä¡¿¡¼­ ³×Æ®¿öÅ© ¼³Á¤
# /etc/netplan/01-netcfg.yaml
.....................


±âÁ¸ /etc/resolv.conf ÆÄÀÏó·³ ¼öÁ¤Çϱâ À§Çؼ­´Â ¾Æ·¡ ÆÄÀÏ ¼öÁ¤
# systemd-resolve --status
Failed to get global data: Unit dbus-org.freedesktop.resolve1.service not found.


# cat /etc/systemd/resolved.conf
..................
[Resolve]
DNS=164.124.101.2


# systemctl restart systemd-resolved.service


¾Æ·¡ ÆÄÀÏÀÌ »ý¼º
# cat /var/run/systemd/resolve/resolv.conf 
..................
nameserver 164.124.101.2


# systemd-resolv --status
Global
         DNS Servers: 164.124.101.2
          DNSSEC NTA: 10.in-addr.arpa
                      16.172.in-addr.arpa
                      168.192.in-addr.arpa
                      17.172.in-addr.arpa
                      18.172.in-addr.arpa
                      19.172.in-addr.arpa
                      20.172.in-addr.arpa
                      21.172.in-addr.arpa
                      22.172.in-addr.arpa
                      23.172.in-addr.arpa
                      24.172.in-addr.arpa
                      25.172.in-addr.arpa
                      26.172.in-addr.arpa
                      27.172.in-addr.arpa
                      28.172.in-addr.arpa
                      29.172.in-addr.arpa
                      30.172.in-addr.arpa
                      31.172.in-addr.arpa
                      corp
                      d.f.ip6.arpa
                      home
                      internal
                      intranet
                      lan
                      local
                      private
                      test
..................
..................

À̸§ Æнº¿öµå
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