[ovs-dev] Problem adding flows openvswitch

[Andi]

On 09/19/2012 06:56 PM, Ben Pfaff wrote:
> On Wed, Sep 19, 2012 at 06:39:54PM +0200, Andi wrote:
>> On 09/19/2012 06:14 PM, Ben Pfaff wrote:
>>> On Wed, Sep 19, 2012 at 03:35:56PM +0200, Andi wrote:
>>>> On 09/18/2012 11:38 PM, Ben Pfaff wrote:
>>>>> On Tue, Sep 18, 2012 at 11:40:24PM +0200, Andi wrote:
>>>>>> On 09/18/2012 11:29 PM, Ben Pfaff wrote:
>>>>>>> On Tue, Sep 18, 2012 at 11:33:33PM +0200, Andi wrote:
>>>>>>>> On 09/18/2012 11:26 PM, Ben Pfaff wrote:
>>>>>>>>> On Tue, Sep 18, 2012 at 11:29:55PM +0200, Andi wrote:
>>>>>>>>>> On 09/18/2012 11:23 PM, Ben Pfaff wrote:
>>>>>>>>>>> On Tue, Sep 18, 2012 at 11:24:52PM +0200, Andi wrote:
>>>>>>>>>>>> Hi Ben,
>>>>>>>>>>>> thank you for your advices.
>>>>>>>>>>>> Please find comments inline.
>>>>>>>>>>>>
>>>>>>>>>>>> Regards
>>>>>>>>>>>> Andi
>>>>>>>>>>>> On 09/18/2012 07:07 PM, Ben Pfaff wrote:
>>>>>>>>>>>>> On Tue, Sep 18, 2012 at 06:11:56PM +0200, Andi wrote:
>>>>>>>>>>>>>> I am having some trouble in adding flow table entries with
>>>>>>>>>>>>>> openvswitch. I am using nox with some modifications on it and when I
>>>>>>>>>>>>>> submit flow mod message the switches appear to accept the packet
>>>>>>>>>>>>>> (all the methods to add the flow entry return 0), but when I use
>>>>>>>>>>>>>> ovs-dpctl dump-flows br0 it has no flows installed.
>>>>>>>>>>>>> ovs-dpctl doesn't display OpenFlow flows.  You can't use it this way.
>>>>>>>>>>>>>
>>>>>>>>>>>>> ovs-ofctl displays OpenFlow flows.  Use "ovs-ofctl dump-flows" to show
>>>>>>>>>>>>> the flow table.
>>>>>>>>>>>> In the dpctl help one finds
>>>>>>>>>>>> /dump-flows DP            display flows in DP/
>>>>>>>>>>>> Using this command with off-the shelf Nox it displays all flows.
>>>>>>>>>>> Is the program named dpctl or ovs-dpctl?  If it's dpctl then you're
>>>>>>>>>>> not using Open vSwitch but something else.
>>>>>>>>>> ovs-dpctl sorry
>>>>>>>>> OK, then what you're saying doesn't make sense and you will have to
>>>>>>>>> provide an example.
>>>>>>>> switch2:/hosthome/OF/openvswitch/build/bin# ./ovs-ofctl dump-flows br0
>>>>>>>> ovs-ofctl: br0 is not a bridge or a socket
>>>>>>> OK, so what's in the rundir (typically /var/run/openvswitch)?
>>>>>> switch2:/hosthome/OF/openvswitch/build/bin# cd /var/run/openvswitch/
>>>>>> switch2:/var/run/openvswitch# ls
>>>>>> br0.mgmt   db.sock               ovsdb-server.pid ovs-vswitchd.pid
>>>>>> br0.snoop  ovsdb-server.495.ctl  ovs-vswitchd.517.ctl
>>>>> This looks OK.
>>>>>
>>>>> I think you must just have misinstalled somehow.  No one else is
>>>>> reporting this problem.  Did you consider installing from distribution
>>>>> packaging rather than by hand?
>>>> Thank you again for your advices. I realized that the OVS_RUNDIR
>>>> environment variable was empty. The internal ovs_rundir() c function
>>>> in ovs-ofctl returned another location so it could not find the
>>>> socket.
>>> That explains the problem.
>>>
>>> Do you know how that happened?  I don't think anything in OVS
>>> recommends setting this variable; definitely you should not set it to
>>> the empty string.
>> Hi Ben,
>> We have installed openvswitch in netkit(a user-mode linux front-end
>> let's say) after cross-compiling it for UML. During the startup of
>> the virtual machines we use a script to install openvswitch using
>> the commands reported in section 7 of INSTALL.Linux. The various
>> environment variables are exported in the script but as it turns out
>> they are not permanent after booting. After chroot-ing in the file
>> system of the virtual machines I have added the export of this
>> variables values in .bashrc.
> Is the script something that might be useful to others?  If so, please
> consider posting it.  If it's general-purpose enough, then perhaps it
> might be useful to include it in the Open vSwitch repository.
>
> Thanks,
>
> Ben.
Hi Ben,

I think it(btw it is a makefile with different targets such as boot, 
start, stop ...) could be useful for those who are using openvswitch on 
netkit. If generalized only a little it can be used even for other 
environments. So could you point me where to exactly put it?

Btw we have also written a guide about installing openvswitch in DD-WRT. 
We have reported the guide here: 
http://www.openflow.org/wk/index.php/UoR_:_Openflow_Kernel_space_on_DD-WRT
If you think it's the case that this should be added even in some 
openvswitch wiki or repository let us know and we will add it.

Regards,
Andi

-- 
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*University of Rome "La Sapienza"*

*Ing Andi Palo*
/PhD student/
/Department of Computer, Control and Management Engineering (DIAG)/

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