[Bug 2060311] Re: Setting "optional: true" to overcome he timeout "Job systemd-networkd-wait-online" does no longer work with latest noble image

[Talha Can Havadar]

Hi Lukas,
I tested the package in your ppa with following configuration:

```
network:
        ethernets:
            all:
                dhcp4: true
                match:
                    name: e*
                optional: true
        version: 2
```

With the version `1.0-2build1` it hit the timeout even though I set all
the interfaces on my DUT(arm64) optional.

Here is the log of journalctl for relevant occurance:
```
Apr 16 11:47:11 kria systemd[1]: Starting systemd-networkd-wait-online.service - Wait for Network to be Configured...
Apr 16 11:49:11 kria systemd-networkd-wait-online[1055]: Timeout occurred while waiting for network connectivity.
Apr 16 11:49:11 kria systemd[1]: systemd-networkd-wait-online.service: Main process exited, code=exited, status=1/FAILURE
Apr 16 11:49:11 kria systemd[1]: systemd-networkd-wait-online.service: Failed with result 'exit-code'.
Apr 16 11:49:11 kria systemd[1]: Failed to start systemd-networkd-wait-online.service - Wait for Network to be Configured.
```

But after installing the version `1.0-2ubuntu1~ppa3`, `systemd-networkd-wait-online` is not triggered since all interfaces set to optional. Therefore no timeout
```
ubuntu at kria:~$ apt policy netplan.io
netplan.io:
  Installed: 1.0-2ubuntu1~ppa3
  Candidate: 1.0-2ubuntu1~ppa3
  Version table:
 *** 1.0-2ubuntu1~ppa3 500
        500 https://ppa.launchpadcontent.net/slyon/lp2060311/ubuntu noble/main arm64 Packages
        100 /var/lib/dpkg/status
     1.0-2build1 500
        500 http://ports.ubuntu.com/ubuntu-ports noble/main arm64 Packages
```

```
ubuntu at kria:~$ journalctl -u systemd-networkd-wait-online --no-pager -b
-- No entries --
```

It looks like the package you have fixes the issue

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https://bugs.launchpad.net/bugs/2060311

Title:
  Setting "optional: true" to overcome he timeout "Job systemd-networkd-
  wait-online" does no longer work with latest noble image

Status in Netplan:
  In Progress
Status in Ubuntu on IBM z Systems:
  New
Status in netplan.io package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Confirmed
Status in netplan.io source package in Noble:
  Confirmed
Status in systemd source package in Noble:
  Confirmed

Bug description:
  Especially on s390x (but not limited to s390x) it's often the case that a system has network devices that are not necessarily connected during boot-up and one gets such a 2 min timeout:
  "Job systemd-networkd-wait-online. Start running (1min 59s / no limit)"

  In the past I could avoid that by setting "optional: true" post-install (no perfect, but worked),
  but this does no longer seem to work using the latest noble ISO image (Apr 5th).

  Setting 'optional: true' in /etc/netplan/50-cloud-init.yaml looks like
  this for me:

  # This file is generated from information provided by the datasource.  Changes
  # to it will not persist across an instance reboot.  To disable cloud-init's
  # network configuration capabilities, write a file
  # /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
  # network: {config: disabled}
  network:
      ethernets:
          enP1p0s0:
              optional: true
              dhcp4: true
          enP1p0s0d1:
              optional: true
              dhcp4: true
          enP2p0s0:
              optional: true
              dhcp4: true
          enP2p0s0d1:
              optional: true
              dhcp4: true
          encc000: {}
      version: 2
      vlans:
          encc000.2653:
              addresses:
              - 10.11.12.15/24
              gateway4: 10.11.12.1
              id: 2653
              link: encc000
              nameservers:
                  addresses:
                  - 10.11.12.1

  ... can be set fine (also --dry-run does not moan, except about
  dhcp4).

  This worked in the past on noble, but also on older Ubuntu releases
  like jammy.

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