There isn't yet a way to allow DNS overrides and DHCP on the same
interface.  That is, the DHCP response from the server may include DNS
entries so the custom nameserver values are not automatically appended
to an existing DHCP configuration.

Generally adding/overriding DHCP response values isn't something that
works by default.  In 16.04 for example, one needs to customize
/etc/dhcp/dhclient.conf or write a dhclient-enter/exit hook.


** Changed in: cloud-init (Ubuntu)
   Importance: Undecided => Low

** Changed in: cloud-init (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1776452

Title:
  Fail to set DNS server and search domain when customize Ubuntu18.04 to
  DHCP IP by cloud-init

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