[Bug 1905472] Re: Something starts dhcclient for every intrface on boot

[Dimitri John Ledkov]

aoetools is effectively unchanged, and their initramfs_hook is the same
since xenial.

in the initramfs-tools the changes between 18.04 LTS and 20.04 LTS are
that for automatic IP bring up, more methods are now supported with more
robust IPv4 DHCP and IPv6 DHCP.

Was your 18.04 LTS installation customized to prevent DCHP in the
initrd? Or was DHCP attempted in 18.04 LTS and simply was failing,
keeping things working? Is this something you can rectify with preup
ifupdown hooks, such that dhcp leases that are not needed are removed in
the running system? Or is booting with ip=none parameter sufficient for
you?

Please indicate what has changed, to cause failures. Because the
behaviour of aoetools in stock configuration between 18.04 LTS and 20.04
LTS is expected to be the same, with dhcp being performed from the
initrd by default.

** Changed in: aoetools (Ubuntu)
       Status: New => Incomplete

** Changed in: initramfs-tools (Ubuntu)
       Status: New => Incomplete

** Summary changed:

- Something starts dhcclient for every intrface on boot
+ aoetools initramfs hooks starts dhcclient for every intrface on boot

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https://bugs.launchpad.net/bugs/1905472

Title:
  aoetools initramfs hooks starts dhcclient for every intrface on boot

Status in aoetools package in Ubuntu:
  Incomplete
Status in ifupdown package in Ubuntu:
  Invalid
Status in initramfs-tools package in Ubuntu:
  Incomplete
Status in netplan.io package in Ubuntu:
  Invalid

Bug description:
  After upgrade frpm 18LTS to 20LTS I've lost the network.

  Network is managed by ifupdown
  Netplan is not installed
  Network manger is disabled (masked)

  Yet, at boot, SOMETHING starts dhclient for every network interface.
  This has disastrous results - dhcp request succeeds on physical
  interface that is a base for a vlan-based interface, causing real dhcp
  request on to fail on vlan interface.

  Expected behavior - dhclient starts only for interfaces marked as dhcp
  in /etc/network/interfaces .

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: isc-dhcp-client 4.4.1-2.1ubuntu5
  ProcVersionSignature: Ubuntu 5.8.0-29.31~20.04.1-generic 5.8.14
  Uname: Linux 5.8.0-29-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.12
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Wed Nov 25 00:07:45 2020
  SourcePackage: isc-dhcp
  UpgradeStatus: No upgrade log present (probably fresh install)

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