[Bug 1619258] Re: netplan should allow NICs to be disconnected and not stall the boot

[Tyler Bennett]

What is the actual fix for this. I have run into this multiple times. Is
there a specific edit that needs to be made to the stanza in netplan?
After reviewing the netplan docs I was unable to find a corresponding
directive for allow-hotplug with /etc/network/interfaces.

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.4 LTS
Release:	20.04
Codename:	focal

$ sudo dpkg --list | grep netplan
ii  libnetplan0:amd64                     0.104-0ubuntu2~20.04.1
ii  netplan.io                            0.104-0ubuntu2~20.04.1

```yaml
network:
  ethernets:
    eno1:
      dhcp4: true
    eno2:
      dhcp4: true
    eno3:
      dhcp4: true
    eno4:
      dhcp4: true
    enp130s0:
      dhcp4: true
    enp130s0d1:
      dhcp4: true
    enp134s0f0:
      dhcp4: true
    enp134s0f1:
      dhcp4: true
    enp135s0f0:
      dhcp4: true
    enp135s0f1:
      dhcp4: true
  version: 2
```

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https://bugs.launchpad.net/bugs/1619258

Title:
  netplan should allow NICs to be disconnected and not stall the boot

Status in Snappy:
  Fix Released
Status in nplan package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released

Bug description:
  in older snappy image we used to set "allow-hotplug" in
  /etc/network/interfaces.d/ when configuring a NIC to avoid the boot to
  completely stall or to be stuck for 5min when trying to find an
  internet connection.

  with recent versions of netplan the configuration seems to be back to
  require a network to be up before moving on with them boot so that
  booting takes forever until the network connection times out.

  netplan should make the system check the physical link status when
  trying to bring up a network device instead of stalling the boot.

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