[Bug 1862232] Re: Long hostname causes networking setup to fail

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: systemd (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1862232

Title:
  Long hostname causes networking setup to fail

Status in systemd package in Ubuntu:
  Confirmed
Status in systemd source package in Bionic:
  Confirmed

Bug description:
  1) ubuntu version
  # lsb_release -rd
  Description:    Ubuntu 18.04.3 LTS
  Release:        18.04

  2) package version
  # apt-cache policy systemd
  systemd:
    Installed: 237-3ubuntu10.31
    Candidate: 237-3ubuntu10.31
    Version table:
   *** 237-3ubuntu10.31 500
          500 http://mirrors.digitalocean.com/ubuntu bionic-updates/main amd64 Packag
  es
          100 /var/lib/dpkg/status
       237-3ubuntu10.29 500
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages 
       237-3ubuntu10 500
          500 http://mirrors.digitalocean.com/ubuntu bionic/main amd64 Packages     

  
  3) I expect the network to come online correctly regardless of how long the hostname is. This is what happens with both 14.0 and 19.0 (I tested the same behavior with both of them).

  4) the external network interface fails to be configured and is stuck
  in a (pending) state as reported by networkctl status -a

  setting the hostname:

  # hostnamectl set-hostname
  asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf

  after rebooting the machine, it no longer has network access.

  # journalctl
  Feb 06 19:29:41 asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf systemd[1]: Starting Wait for Network to be Configured...
  Feb 06 19:29:41 asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf systemd-networkd[605]: eth0: Link state is up-to-date
  Feb 06 19:29:41 asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf systemd-networkd[605]: eth0: found matching network '/run/systemd/network/10-netplan-eth0.network'
  Feb 06 19:29:41 asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf systemd-networkd[605]: sd-netlink: callback failed: Invalid argument
  Feb 06 19:29:41 asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf systemd-networkd[605]: lo: Link state is up-to-date

  # networkctl status -a:
  ● 1: lo
         Link File: /lib/systemd/network/99-default.link
      Network File: n/a
              Type: loopback
             State: carrier (unmanaged)
           Address: 127.0.0.1
                    ::1

  ● 2: eth0
         Link File: /run/systemd/network/10-netplan-eth0.link
      Network File: /run/systemd/network/10-netplan-eth0.network
              Type: ether
             State: off (pending)
              Path: pci-0000:00:03.0
            Driver: virtio_net
            Vendor: Red Hat, Inc.
             Model: Virtio network device
        HW Address: ae:4d:91:1c:e8:86
               DNS: 67.207.67.3
                    67.207.67.2

  and to bring up the network correctly, set the hostname to something
  shorter

  # hostnamectl set-hostname asdf
  # systemctl restart systemd-networkd
  # networkctl status -a
  ● 1: lo
         Link File: /lib/systemd/network/99-default.link
      Network File: n/a
              Type: loopback
             State: carrier (unmanaged)
           Address: 127.0.0.1
                    ::1

  ● 2: eth0
         Link File: /run/systemd/network/10-netplan-eth0.link
      Network File: /run/systemd/network/10-netplan-eth0.network
              Type: ether
             State: routable (configured)
              Path: pci-0000:00:03.0
            Driver: virtio_net
            Vendor: Red Hat, Inc.
             Model: Virtio network device
        HW Address: ae:4d:91:1c:e8:86
           Address: 10.17.0.5
                    157.245.210.250
                    fe80::ac4d:91ff:fe1c:e886
           Gateway: 157.245.208.1 (ICANN, IANA Department)
               DNS: 67.207.67.3
                    67.207.67.2

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