Confirmed that the new network-manager does fix the issue here. I've now
uploaded a reverted lxc.
** Changed in: lxc (Ubuntu Wily)
Status: Triaged => Invalid
** Changed in: lxc (Ubuntu Xenial)
Status: Triaged => Invalid
** Description changed:
- After initial upgrade from Ubuntu 15.04 to Ubuntu 15.10 LXC worked for a
- couple days then failed. I found that the lxcbr0 interface no longer
- existed.
+ === SRU ===
+ Rationale:
+ Network Manager in wily triggers on newly created interfaces and resets
their network configuration even though it's not supposed to manage them at all.
+ This breaks LXC and quite possibly libvirt as those provide bridges which
are then completely unconfigured by Network Manager.
+
+ Test case:
+ 1) Update (or not) network-manager
+ 2) Restart it
+ 3) Install lxc
+ 4) Check that lxcbr0 exists and has an IP configured
+
+ Regression potential:
+ The change to Network Manager is related to udev handling of new devices,
even though normal operation on a regular desktop machine was tested, it's not
impossible that this may regress handling of some devices.
+ The fix was cherry-picked directly from upstream, so did go through code
review and has been publicly available for a while.
+
+ This fixes a significant regression compared to Ubuntu 15.04 and looks
+ less risky than the alternative workaround which was uploaded earlier.
+
+
+ === Original report ===
+ After initial upgrade from Ubuntu 15.04 to Ubuntu 15.10 LXC worked for a
couple days then failed. I found that the lxcbr0 interface no longer existed.
I reported this on the lxc-user alias and about the same time several
others had this happen to them also.
Serge Hallyn requested I open a launchpad bug and post some info but
before I could gather that info the system returned to normal (re lxcbr0
was back) the next day after the server was booted up again.
note: at least one other person had this happen to them also (lxcbr0
came back by itself).
Today, I booted this server again and ... again lxcbr0 was missing where
it had been working last night.
Below is all of the Info Serge Hallyn asked me to post.
$ ifconfig lxcbr0
lxcbr0: error fetching interface information: Device not found
-
$ journalctl -u lxc-net
-- Logs begin at Tue 2015-11-03 07:25:22 EST, end at Tue 2015-11-03 10:02:08
EST
Nov 03 07:25:48 server3 systemd[1]: Starting LXC network bridge setup...
Nov 03 07:25:50 server3 lxc-net[913]: dnsmasq: failed to create listening
socket
Nov 03 07:25:50 server3 lxc-net[913]: Failed to setup lxc-net.
Nov 03 07:25:50 server3 systemd[1]: Started LXC network bridge setup.
root@server3:/home/bmullan# /usr/lib/x86_64-linux-gnu/lxc/lxc-net stop
# note - execution just returns to command line
root@server3:/home/bmullan#
>> and lxcbr0 is still missing
# ifconfig lxcbr0
lxcbr0: error fetching interface information: Device not found
root@server3:/home/bmullan# /usr/lib/x86_64-linux-gnu/lxc/lxc-net start
dnsmasq: failed to create listening socket for 10.0.3.1: Cannot assign
requested address
Failed to setup lxc-net.
root@server3:/home/bmullan#
$ uname -a
Linux server3 4.2.0-16-generic #19-Ubuntu SMP Thu Oct 8 15:35:06 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.10
Release: 15.10
Codename: wily
** Changed in: network-manager (Ubuntu Wily)
Status: Triaged => Fix Committed
** Tags added: verification-needed
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https://bugs.launchpad.net/bugs/1512749
Title:
lxcbr0 dissappears on Ubuntu 15.10
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