Closing as these days we only have LXD preinstalled on those images and
LXD does a lot more validation and only creates the networks on first
use.
** Changed in: lxc (Ubuntu)
Status: Triaged => Won't Fix
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https://bugs.launchpad.net/bugs/1510108
Title:
pre-installed lxc in cloud-image means loss of access to 10.0.X.0/24
Status in lxc package in Ubuntu:
Won't Fix
Bug description:
Bug 1509414 describes fallout of inclusion of lxc in cloud images. The
initial inclusion caused 2 issues:
a.) containers created by 'lxc -t ubuntu-cloud' and 'lxd import-images
ubuntu wily' had completely broken networking
b.) all cloud images would have lost access to 10.0.3.0/24 networks.
The fix that went in fixes 'a' above. By default, containers created
for lxd and lxc will now work as expected.
This bug is opened to address the much less severe 'b'.
Now, on first boot lxc-net selects a network in the 10.0.X.0/24 to
give to the lxcbr0 bridge. It selects the network by simply looking
for the first available N where there . That code can be seen prior
to fix in debian/lxc.preinst [1] and after fix in
config/init/common/lxc-net.in [2]. Generally speaking it looks for
local ip addresses on the targeted network. That code is fairly
simplistic. There are definitely cases where it can pick a network
that would be used by this system. The result is that traffic
destined for that network will be sent to the lxcbr0 rather than out
of the system to wherever it should go.
The suggested fix would be to make that code run on 'lxc' or 'lxd'
usage rather than on instance boot. By doing so, we reduce the set of
users possibly affected from all cloud-image users to all users of lxc
or lxd.
Note, all users of lxd and lxc have been affected by this bug since at
least 14.04.
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[1]
https://github.com/lxc/lxc-pkg-ubuntu/blob/dpm-wily/debian/lxc.preinst#L55
[2]
https://github.com/lxc/lxc-pkg-ubuntu/blob/dpm-wily/config/init/common/lxc-net.in
Related bugs:
* bug 1509414: pre-installed lxc in cloud image produces broken lxc (and
later lxd) containers
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