Additionally, Juju creates bridges on top of both physical and VLAN
interfaces to allow for the same level of addressability for containers
as regular machines. The bridges currently use the "br-" prefix and the
underlying device name, which if it happens to be
"enxxaabbccddeef0.1234" already,
Depending on the version of juju used, one option is to set:
lxc-default-mtu: 9000
in environments.yaml for that environment and re-bootstrap. All LXC
containers juju creates should use 9000 as MTU for the eth0 of the
container.
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juju-br0 was reintroduced in 1.23.3 as the default behavior in MAAS,
unless the address-allocation feature flag is enabled.
AIUI the juju-br0 swallows the interface-mtu DHCP setting coming
from MAAS. It doesn't happen when eth0 is not bound to juju-br0. So it
looks like this is a pre-existing
See also the related bug 1442257 which has a proposed fix.
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https://bugs.launchpad.net/bugs/1355813
Title:
Interface MTU management across MAAS/juju
Status in
Since 1.23 there's no need to create juju-br0 (or as it used to be
called before - br0) at initial boot, so this should solve the issue.
** Changed in: juju-core
Status: Triaged = Fix Committed
** Changed in: juju-core
Milestone: None = 1.23-beta1
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Proposed a fix with http://reviews.vapour.ws/r/686/ - before starting a
container, the host's primary physical NIC's MTU value is detected and
applied to the container's veth device.
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Touch seeded packages, which is
** Changed in: juju-core
Status: In Progress = Fix Committed
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https://bugs.launchpad.net/bugs/1355813
Title:
Interface MTU management across MAAS/juju
** Changed in: juju-core
Assignee: (unassigned) = Dimiter Naydenov (dimitern)
** Changed in: juju-core
Status: Triaged = In Progress
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