[Bug 1355813] [NEW] LXC containers reset bridge MTU on start/restart

[James Page]

Public bug reported:

Context:

juju + MAAS deployed OpenStack environment, misc services deployed under
LXC on the bootstrap node, interfaces configured for jumbo frames - note
that I had to manually set the LXC container interfaces to mtu 9000
before the bridge would do the same.

Action:

Reboot one of the containers; MTU on br0 resets from 9000 -> 1500.

This feels like more of a 'we need a better way to orchestrate MTU
configuration across different services' so raising tasks for MAAS and
Juju as well.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: lxc 1.0.5-0ubuntu0.1
ProcVersionSignature: User Name 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
Date: Tue Aug 12 13:26:00 2014
KernLog:

SourcePackage: lxc
UpgradeStatus: No upgrade log present (probably fresh install)
defaults.conf:
 lxc.network.type = veth
 lxc.network.link = lxcbr0
 lxc.network.flags = up
 lxc.network.hwaddr = 00:16:3e:xx:xx:xx
lxcsyslog:

** Affects: juju-core
     Importance: Undecided
         Status: New

** Affects: maas
     Importance: Undecided
         Status: New

** Affects: lxc (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty uec-images

** Also affects: juju-core
   Importance: Undecided
       Status: New

** Also affects: maas
   Importance: Undecided
       Status: New

** Description changed:

  Context:
  
  juju + MAAS deployed OpenStack environment, misc services deployed under
  LXC on the bootstrap node, interfaces configured for jumbo frames - note
  that I had to manually set the LXC container interfaces to mtu 9000
  before the bridge would do the same.
  
  Action:
  
- Reboot on of the containers; MTU on br0 resets from 9000 -> 1500.
+ Reboot one of the containers; MTU on br0 resets from 9000 -> 1500.
  
  This feels like more of a 'we need a better way to orchestrate MTU
  configuration across different services' so raising tasks for MAAS and
  Juju as well.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: lxc 1.0.5-0ubuntu0.1
  ProcVersionSignature: User Name 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  Date: Tue Aug 12 13:26:00 2014
  KernLog:
-  
+ 
  SourcePackage: lxc
  UpgradeStatus: No upgrade log present (probably fresh install)
  defaults.conf:
-  lxc.network.type = veth
-  lxc.network.link = lxcbr0
-  lxc.network.flags = up
-  lxc.network.hwaddr = 00:16:3e:xx:xx:xx
+  lxc.network.type = veth
+  lxc.network.link = lxcbr0
+  lxc.network.flags = up
+  lxc.network.hwaddr = 00:16:3e:xx:xx:xx
  lxcsyslog:

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https://bugs.launchpad.net/bugs/1355813

Title:
  LXC containers reset bridge MTU on start/restart

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