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Hello David,

Did you solve your issue?
Did you check that it depends on the default container interface's mtu itself?

Best regards,
JP


On 6 December 2017 at 18:45, David Young <davidy at funkypenguin.co.nz> wrote:
> So..
>
> On 07/12/2017 03:12, Jean-Philippe Evrard wrote:
>
> For the mtu, it would be impactful to do it on a live environment. I
> expect that if you change the container configuration, it would
> restart.
>
> It’s a busy lab environment, but given that it’s fully HA (2 controllers), I
> didn’t anticipate a significant problem with changing container
> configuration one-at-a-time.
>
> However, the change has had an unexpected side effect - one of the
> controllers (I haven’t rebooted the other one yet) seems to have lost the
> ability to bring up lxcbr0, and so while it can start all its containers,
> none of them have any management connectivity on eth0, which of course
> breaks all sorts of things.
>
> I.e.
>
> root at nbs-dh-10:~# systemctl status networking.service
> ● networking.service - Raise network interfaces
>    Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor
> preset: enabled)
>   Drop-In: /run/systemd/generator/networking.service.d
>            └─50-insserv.conf-$network.conf
>    Active: failed (Result: exit-code) since Thu 2017-12-07 06:37:00 NZDT;
> 14min ago
>      Docs: man:interfaces(5)
>   Process: 2717 ExecStart=/sbin/ifup -a --read-environment (code=exited,
> status=1/FAILURE)
>   Process: 2656 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ]
> && [ -n "$(ifquery --read-environment --list --exclude=lo)" ] && udevadm
> settle (code=e
>  Main PID: 2717 (code=exited, status=1/FAILURE)
>
> Dec 07 06:36:58 nbs-dh-10 systemd[1]: Starting Raise network interfaces...
> Dec 07 06:36:58 nbs-dh-10 ifup[2717]: RTNETLINK answers: Invalid argument
> Dec 07 06:36:58 nbs-dh-10 ifup[2717]: /sbin/ifup: waiting for lock on
> /run/network/ifstate.enp4s0
> Dec 07 06:36:58 nbs-dh-10 ifup[2717]: /sbin/ifup: waiting for lock on
> /run/network/ifstate.br-mgmt
> Dec 07 06:37:00 nbs-dh-10 ifup[2717]: /sbin/ifup: waiting for lock on
> /run/network/ifstate.br-vlan
> Dec 07 06:37:00 nbs-dh-10 ifup[2717]: Failed to bring up lxcbr0.
> Dec 07 06:37:00 nbs-dh-10 systemd[1]: networking.service: Main process
> exited, code=exited, status=1/FAILURE
> Dec 07 06:37:00 nbs-dh-10 systemd[1]: Failed to start Raise network
> interfaces.
> Dec 07 06:37:00 nbs-dh-10 systemd[1]: networking.service: Unit entered
> failed state.
> Dec 07 06:37:00 nbs-dh-10 systemd[1]: networking.service: Failed with result
> 'exit-code'.
> root at nbs-dh-10:~#
>
> I’ve manually reversed the “lxc.network.mtu = 1550” entry in
> /etc/lxc/lxc-openstack.conf, but this doesn’t seem to have made a
> difference.
>
> What’s also odd is that lxcbr0 appears to be perfectly normal:
>
> root at nbs-dh-10:~# brctl show lxcbr0
> bridge name    bridge id        STP enabled    interfaces
> lxcbr0        8000.fe0a7fa28303    no        04063403_eth0
>                             075266dc_eth0
>                             160c9b30_eth0
>                             38ac19ae_eth0
>                             4f57300f_eth0
>                             59b2b5a5_eth0
>                             5b7bbeb4_eth0
>                             64a1fcdd_eth0
>                             6c99f5fe_eth0
>                             6f93ebb2_eth0
>                             70ce61e5_eth0
>                             745ba80d_eth0
>                             85df2fa5_eth0
>                             99e6adf8_eth0
>                             cbdfa2f3_eth0
>                             e15dc279_eth0
>                             ea67ce7e_eth0
>                             ed5c7af9_eth0
> root at nbs-dh-10:~#
>
> … But, no matter the value of lxc.network.mtu, it doesn’t change from 1500
> (I suppose this could actually have reduced itself based on the lower MTUs
> of the member interfaces though):
>
> root at nbs-dh-10:~# ifconfig lxcbr0
> lxcbr0    Link encap:Ethernet  HWaddr fe:0c:5d:1c:36:da
>           inet addr:10.0.3.1  Bcast:10.0.3.255  Mask:255.255.255.0
>           inet6 addr: fe80::f4b0:bff:fec3:63b0/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:499 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:128882 (128.8 KB)  TX bytes:828 (828.0 B)
>
> root at nbs-dh-10:~#
>
> Any debugging suggestions?
>
> Thanks,
> D