[ovs-discuss] Open vSwitch, brcompatd & OpenVZ on Debian

Sam Gaw hello at samgaw.co.uk
Thu May 5 11:20:05 UTC 2011

Thanks Gregor.

That's what I thought but if I configure the bridge, either with ovs-vsctl or brctl, and do an ifup the box kernel panics. If I follow the cookbook example and then join the veth interface to it I can't see the container but get a response from pings; if I assign an IP to the bridge I can connect to the hardware node that OVS is running on.

I think this is more pilot error than anything else. Any ideas what I'm doing wrong?



On 5 May 2011, at 10:22, Gregor Schaffrath wrote:

> With brcompat, you should be able to set things up as they were before...
> However - beware two issues I personally stumbled across:
> 1) if you don't start with a blank ovs configuration database at boot time, you'll end up with redundant entries in it, because the debian startup scripts will add interfaces again and again via brcompatd
> 2) mind that setting a vlan trunk on a port has a slightly different semantic with openvswitch compared to the std. linux bridge: as soon as you've added a trunk, you won't see _any_ traffic except this trunk on the port anymore (not even on eth0, if you created eth0.395 using vconf !)
> Otherwise: To get an understanding on how to operate things... unless you want to bridge vlans, you could consider openvswitch just a manageable switch (setting port configuration by database manipulations - have a look at 'ovs-vsctl list Port' ; and don't forget to set the tag values for the virtual interfaces ;) )
> Cheers,
> 	Gregor.
> On Thu, May 05, 2011 at 09:28:54AM +0100, Sam Gaw wrote:
>> I've been experimenting with OVS (1.1.0pre2) alongside OpenVZ running on Debian Squeeze (2.6.32-5) and was wondering if anyone had any experience or advice with this sort of setup?
>> Normally with OpenVZ I would create a bridge and add the containers' veth interfaces to the bridge. The config in /etc/network/interfaces ends up looking like:
>> 	allow-hotplug eth0
>> 	iface eth0 inet manual
>> 	auto vzbr0
>> 	iface vzbr0 inet static
>> 	    address
>> 	    netmask
>> 	    gateway
>> 	    bridge_ports eth0
>> 	    bridge_stp off
>> 	    bridge_fd 0
>> The command to join the container's eth0 veth interface to the bridge is just:
>> 	vzctl set 100 --netif_add eth0,,,,vzbr0 --save
>> Reading the Open vSwitch documentation on VLANs (http://openvswitch.org/?page_id=146) it describes exactly how I'd want the bridges to operate, as a VLAN trunk to my switches, but I'm not quite sure what config I'm expected to use to set the bridges up. I've tried creating a new bridge with both ovs-vsctl (add-br, add-port) and brctl but I'm not seeing any traffic going to my containers.
>> Any help is much appreciated.
>> ---
>> Sam
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