touch-packages team mailing list archive

[Kapil Thangavelu <1355813@xxxxxxxxxxxxxxxxxx>]

i've seen reference to you can't really set a bridge mtu, you have to
set it for all the containers on the bridge, ie. bridges take the lowest
mtu of their interfaces. so instead we have to set all the containers
mtu.

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

Title:
  LXC containers reset bridge MTU on start/restart

Status in juju-core:
  Incomplete
Status in MAAS:
  Incomplete
Status in “lxc” package in Ubuntu:
  Incomplete

Bug description:
  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:

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