[Bug 1573272] Re: default gateway route not installed for bond interfaces through reboot

[Jaakko Salo]

As a workaround, you can do the following (using the original report's
config as an example):

# systemctl edit ifup at bond0.3000

Add the following and save the file:

[Unit]
After=ifup at bond0.service

Then, let's add Type=oneshot to the ifup@ template so that the above
After= actually has some effect:

# systemctl edit ifup@

Add the following and save the file:

[Service]
Type=oneshot

Then reboot.

The problem seems to be a race condition introduced with systemd
integration. For me, the missing default route triggered around 80% of
the time, but not always.

On Ubuntu 16, systemd executes the ifup@ template units in parallel in a
way that is not adequately controlled. For instance, ifup at bond0.3000 and
ifup at bond0 will execute in parallel. The ifup for bond0 will involve "ip
link ... down", then "up" from ifenslave hooks. I believe that if the
link down comes after default route from bond0.3000, the default route
will be deleted. My journalctl observations support this.

Debugging tip: use systemctl edit ifup@, and add --verbose to the ifup
invocations (note, there are 2 of them!). Adding the verbose option to
/etc/default/networking does not work, except for lo interface.

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https://bugs.launchpad.net/bugs/1573272

Title:
  default gateway route not installed for bond interfaces through reboot

Status in ifupdown package in Ubuntu:
  Confirmed

Bug description:
  Expectation:  After reboot, route for default gateway specified on
  bonded interface is installed according to "gateway x.x.x.x"  (where
  x.x.x.x is a valid IPv4 address) specified in /etc/network/interfaces
  or files sourced per /etc/network/interfaces

  Actual Result: After reboot, route is not installed. Interface does
  work otherwise (I can ping the gateway on that subnet, for instance).
  'ifdown -a' followed by  'ifup -a' (run with proper permission... so
  sudo) brings the gateway back until next reboot.

  Package:  I'm not familiar enough to be certain what is causing this,
  but I was seeing this in beta2 of 16.04 as well.

  *username snipped*@*hostname snipped*:~$ lsb_release -rd
  Description:    Ubuntu 16.04 LTS
  Release:        16.04
  *username snipped*@*hostname snipped*:~$ apt-cache policy ifenslave
  ifenslave:
    Installed: 2.7ubuntu1
    Candidate: 2.7ubuntu1
    Version table:
   *** 2.7ubuntu1 100
          100 /var/lib/dpkg/status

  *username snipped*@*hostname snipped*:~$ apt-cache policy ifupdown
  ifupdown:
    Installed: 0.8.10ubuntu1
    Candidate: 0.8.10ubuntu1
    Version table:
   *** 0.8.10ubuntu1 100
          100 /var/lib/dpkg/status
          
          
        



  
        /etc/network/interfaces

  ----------------------------------
  # This file describes the network interfaces available on your system
  # and how to activate them. For more information, see interfaces(5).

  source /etc/network/interfaces.d/*

  # The loopback network interface
  auto lo
  iface lo inet loopback

  # The primary network interface
  auto enp2s0f1
  iface enp2s0f1 inet manual
  bond-master bond0

  auto enp2s0f0
  iface enp2s0f0 inet manual
  bond-master bond0

  auto bond0
  iface bond0 inet static
          address 10.96.96.2
          netmask 255.255.255.0
          network 10.96.96.0
          broadcast 10.96.96.255
          # dns-* options are implemented by the resolvconf package, if installed
          dns-search *snip*
          bond-mode balance-alb
          bond-slaves none
          bond-miimon 100
  auto bond0.3000 
  iface bond0.3000 inet static
          address 172.21.33.29
          netmask 255.255.255.0
          network 172.21.33.0
          broadcast 172.21.33.255
          gateway 172.21.33.1
          dns-search *snip*
          vlan-raw-device bond0
          dns-nameservers 172.31.10.84 8.8.8.8 4.2.2.2
          
  -----------------------------------------------------
  interfaces.d is empty:

  *username snipped*@*hostname snipped*:~$ ls -lisah /etc/network/interfaces.d
  total 8.0K
  10748247 4.0K drwxr-xr-x 2 root root 4.0K Jan 24 14:08 .
  10748237 4.0K drwxr-xr-x 7 root root 4.0K Apr 21 17:32 ..

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