[ovs-discuss] openvswitch-2.0.1 in debian

[Gurucharan Shetty]

On Mon, Mar 17, 2014 at 4:58 PM, Tim Wolf
<timewulf at network-application.de> wrote:
> Thanks for your ideas, I tried them and a few changes based on them.
> The results were a little bit confusing, but in the end I got it working:
>
> 1) I removed all "auto ..." statements for br0, br1, eth0, eth1 - no
> interfaces got up.
> 2) I put the "auto ..." statements back to eth0 and eth1 - all works,
> but at 2nd
>     reboot the bridges again won't come up, no idea why.
> 3) I removed pre-up and post-down from br0 and br1 - br1 works as
> expected, br0 doesn't
>     The only difference I see, is the up-statement in the last line,
> which works on br1.
> 4) I commented this out - both interfaces won't work
> 5) I uncommented this up-statement again and added a new up-statement
>     for default gw on br0 - all works now!

It should not be that complicated. I think "auto" should not be used
because these interfaces are started by Open vSwitch startup script.
If you follow the example as-is in
/usr/share/doc/openvswitch-datapath-source/README.Debian, it should
work as-is. If you want to do
customization, have a look at
/usr/share/openvswitch/scripts/ifupdown.sh. The configuration in
'interfaces' simply call ovs-vsctl in the
background.



>
> For completeness, here is the working "/etc/network/interfaces":
>
> # ----- Start of "/etc/network/interfaces" ----- #
>
> # This file describes the network interfaces available on your system
> # and how to activate them. For more information, see interfaces(5).
>
> # The loopback network interface
> auto lo
> iface lo inet loopback
>
>
> # The primary network interface
> #auto br0
> allow-ovs br0
> iface br0 inet static
>         address 85.###.###.###
>         netmask 255.255.255.255
>         network 85.###.###.###
>         broadcast 85.###.###.###
>         gateway 85.###.###.###
>         mtu 1500
>         ovs_type OVSBridge
>         ovs_ports eth0
> #       pre-up ifconfig $IFACE up
> #       post-down ifconfig $IFACE down
>
> auto eth0
> allow-br0 eth0
> iface eth0 inet manual
>         address 0.0.0.0
>         ovs_bridge br0
>         ovs_type OVSPort
>         pre-up ifconfig $IFACE up
>         post-down ifconfig $IFACE down
>
> up route add default gw 85.###.###.### dev br0
>
>
> # The secondary network interface
> #auto br1
> allow-ovs br1
> iface br1 inet static
>         address 10.###.###.###
>         netmask 255.255.255.0
>         network 10.###.###.0
>         broadcast 10.###.###.255
>         mtu 1500
>         ovs_type OVSBridge
>         ovs_ports eth1
> #       pre-up ifconfig $IFACE up
> #       post-down ifconfig $IFACE down
>
> auto eth1
> allow-br1 eth1
> iface eth1 inet manual
>         address 0.0.0.0
>         ovs_bridge br1
>         ovs_type OVSPort
>         pre-up ifconfig $IFACE up
>         post-down ifconfig $IFACE down
>
> up route add -net 10.48.0.0/16 gw 10.###.###.1 dev br1
>
> # ----- End of "/etc/network/interfaces" -----
>
> I think, the "pre-up ifconfig $IFACE up" statements on the two bridges
> just touched them, what was
> they need to get up! When I commented them out, the "up route add ..."
> entries did the same.
>
> Do you know a more "straight forward" and clean way, to touch the
> bridges? - I don't like to start complicated scripts
> that aren't really needed, and to add the routes will just hide the real
> reason, why they are put in. Maybe on
> other machines, one doesn't need routes at all.
>
>
> Thanks once again. Now I can go on playing with Xen ... ;-)
>
> Greetings,
>
> Berthold Humkamp
>
>
> Am 17.03.2014 21:16, schrieb Gurucharan Shetty:
>> I reproduced your problem.
>>
>> Remove
>> pre-up ifconfig $IFACE up
>> post-down ifconfig $IFACE down
> You mean in br0 / br1 block? - done!
>> Those two does not make much sense for this context.
>>
>> On Mon, Mar 17, 2014 at 1:03 PM, Gurucharan Shetty <shettyg at nicira.com> wrote:
>>>>> What does "ovs-vsctl show" say?
>>>> no bridges or ports, only the version
>>> Okay.
>>> Now,
>>> ovs-vsctl add-br br0
>>> followed by:
>>> ovs-vsctl show
>>> shows the bridge "br0", right?
> right!
>>> "ifconfig br0" shows the bridge too?
> right!
>>> If so:
>>> /etc/init.d/openvswitch-switch stop
>>>
>>> "ifconfig br0" does not show the bridge anymore?
> right!