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[Bug 1758919] Re: Static routes are not per-interface, which breaks some deployments

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: James Falcon <1758919@xxxxxxxxxxxxxxxxxx>
Date: Thu, 11 May 2023 11:57:54 -0000
Reply-to: Bug 1758919 <1758919@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

Tracked in Github Issues as https://github.com/canonical/cloud-
init/issues/3143

** Bug watch added: github.com/canonical/cloud-init/issues #3143
   https://github.com/canonical/cloud-init/issues/3143

** Changed in: cloud-init
       Status: Triaged => Expired

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https://bugs.launchpad.net/bugs/1758919

Title:
  Static routes are not per-interface, which breaks some deployments

Status in cloud-init:
  Expired
Status in MAAS:
  Fix Released
Status in MAAS 2.3 series:
  Fix Released

Bug description:
  When juju tries to deploy a lxd container on a maas managed machine,
  it looses all static routes, due to ifdown/ifup being issued and e/n/i
  has no saved data on the original state.

  Machine with no lxd container deployed:
  root@4-compute-4:~# ip r
  default via 100.68.4.254 dev bond2 onlink 
  100.68.4.0/24 dev bond2  proto kernel  scope link  src 100.68.4.1 
  100.68.5.0/24 via 100.68.4.254 dev bond2 
  100.68.6.0/24 via 100.68.4.254 dev bond2 
  100.84.4.0/24 dev bond1  proto kernel  scope link  src 100.84.4.2 
  100.84.5.0/24 via 100.84.4.254 dev bond1 
  100.84.6.0/24 via 100.84.4.254 dev bond1 
  100.99.4.0/24 dev bond0  proto kernel  scope link  src 100.99.4.101 
  100.99.5.0/24 via 100.99.4.254 dev bond0 
  100.99.6.0/24 via 100.99.4.254 dev bond0 
  100.107.0.0/24 via 100.99.4.254 dev bond0 

  After juju deploys a container, routes are disappearing:
  root@4-management-1:~# ip r
  default via 100.68.100.254 dev bond2 onlink 
  10.177.144.0/24 dev lxdbr0  proto kernel  scope link  src 10.177.144.1 
  100.68.100.0/24 dev bond2  proto kernel  scope link  src 100.68.100.26 
  100.84.4.0/24 dev br-bond1  proto kernel  scope link  src 100.84.4.1 
  100.99.4.0/24 dev br-bond0  proto kernel  scope link  src 100.99.4.3 

  After host reboot, the routes are NOT getting back in place, they are still gone:
  root@4-management-1:~# ip r s
  default via 100.68.100.254 dev bond2 onlink 
  100.68.100.0/24 dev bond2  proto kernel  scope link  src 100.68.100.26 
  100.84.4.0/24 dev br-bond1  proto kernel  scope link  src 100.84.4.1 
  100.84.5.0/24 via 100.84.4.254 dev br-bond1 
  100.84.6.0/24 via 100.84.4.254 dev br-bond1 
  100.99.4.0/24 dev br-bond0  proto kernel  scope link  src 100.99.4.3

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