[Bug 2008952] Re: DNS failure while trying to fetch user-data

[Chad Smith]

While retries on DNS resolution failures does not work for cloud-
init.service for environments running NetworkManager.service (desktop
live ISOs), I have found that the retries work where systemd-networkd is
bringing up network config (server live ISOs). This is because cloud-
init.service is After=systemd-network-wait-online.service which provides
systemd-resolved with viable network interfaces which are up and
providing access to functional DNS configuration.

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Title:
  DNS failure while trying to fetch user-data

Status in cloud-init:
  Triaged
Status in netplan:
  Invalid
Status in subiquity:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  In testing netboot + autoinstall of the new ubuntu desktop subiquity
  based installer for 23.04 I found cloud-init is failing to retrieve
  user-data because it can't resolved the hostname in the URL.  This
  same configuration does work for 22.04 based subiquity, so seems a
  regression.

  From the ipxe config:

  imgargs vmlinuz initrd=initrd \
   ip=dhcp \
   iso-url=http://cdimage.ubuntu.com/daily-live/pending/lunar-desktop-amd64.iso \
   fsck.mode=skip \
   layerfs-path=minimal.standard.live.squashfs \
   autoinstall \
   'ds=nocloud-net;s=http://boot.linuxgroove.com/ubuntu/23.04/' \

  That fails, but if we replace boot.linuxgroove.com with the IP it
  works.

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