[ovs-discuss] Unable to make Netflow v5 working

[Duy Bach Ha]

Hello,

An update on the matter, I discovered that the cause of my crashing is 
not from connecting to the controller, but because of this command:

/sh ovs-vsctl -- set Bridge s1 netflow=@nf -- --id=@nf create NetFlow 
targets=\"192.168.1.2:5566\" active-timeout=10/

I'm on ovs 2.1.2, linux kernel version 3.11 and is working with kernel 
module I compiled with gcc 4.7. At first I thought it is because of the 
controller, but actually it's not. The moment I add NetFlow 
configuration, the switch crashed, than come back again, then crash 
again, infinitely. However, in the testsuite, tes-netflow just run 
successfully.

/2014-07-26T14:23:31.315Z|00017|daemon(monitor)|WARN|9 crashes: pid 6215 
died, killed (Segmentation fault), core dumped, waiting until 10 seconds 
since last restart//
//2014-07-26T14:23:41.315Z|00018|daemon(monitor)|ERR|9 crashes: pid 6215 
died, killed (Segmentation fault), core dumped, restarting/

This is syslog:

/Jul 27 15:35:48 LilBao ovs-vsctl: ovs|00001|vsctl|INFO|Called as 
ovs-vsctl -- set Bridge s1 netflow=@nf -- --id=@nf create NetFlow 
"targets=\"192.168.1.2:5566\"" active-timeout=10//
//....//
//Jul 27 15:35:49 LilBao kernel: [  241.781970] ovs-vswitchd[1738]: 
segfault at 10 ip 0000000000431469 sp 00007fff8fb8c500 error 4 in 
ovs-vswitchd[400000+141000]//
//....//
//Jul 27 15:35:50 LilBao ovs-vswitchd: ovs|00002|daemon(monitor)|ERR|1 
crashes: pid 1738 died, killed (Segmentation fault), core dumped, 
restarting//
//.... and then after that the log of the restart of all switches/

So again, I hope you guys can give me suggestion on my 3 questions that 
I previously asked:
1 - If the netflow configuration is wrong, please point out for me. Or 
if my concept is wrong, please. :)
2 - Do netflow require a kernel module or just user space is enough?
3 - If a kernel module is required, so can you suggest me with the good 
version combination between kernel, ovs and gcc?

Thank you so much,
Duy

On 07/26/2014 05:16 PM, Duy Bach Ha wrote:
> Hi all,
>
> I'm running an experimental mininet network of 6 ovs switches and some 
> hosts (with ip in 192.168.1.0/24) and try to deploy Netflow on the 
> switches. The controller I'm using is opendaylight. So for example:
>
> /sudo mn --switch ovsk --controller remote --custom 
> /smile/ncstestmap.py --topo ncstestmap --arp/
> /sh ovs-vsctl -- set Bridge s1 netflow=@nf -- --id=@nf create NetFlow 
> targets=\"192.168.1.2:5566\" active-timeout=10/
>
> Everything went fine, I can check with ovs-vsctl list NetFlow or list 
> Bridge and the configuration is there.
>
> My purpose is just to use wireshark to see on (for example) all s1 
> interfaces the Netflow (cflow in wireshark) packets coming to the 
> destination. I first try it with ping and then with udp client and 
> server. All shows up on wireshark. (According to wiki, netflow v5 also 
> consider ping as a flow). But no netflow report is coming out. In 
> /var/log/openvswitch/ovs-vswitchd.log, no collector failure or 
> something like that is showing.
>
> I have tried downgraded to kernel version to 3.11.10 (with headers 
> installed) and compiled a kernel module for 2.1.2 with gcc 4.7 (which 
> is the one used to compile 3.11.10 for ubuntu). But the switches just 
> crashed at the moment it connect to the controller. Sometimes at the 
> first run after compilation work, it works and the next restart it 
> does not.
>
> /2014-07-26T14:23:31.315Z|00017|daemon(monitor)|WARN|9 crashes: pid 
> 6215 died, killed (Segmentation fault), core dumped, waiting until 10 
> seconds since last restart//
> //2014-07-26T14:23:41.315Z|00018|daemon(monitor)|ERR|9 crashes: pid 
> 6215 died, killed (Segmentation fault), core dumped, restarting/
>
> I search harder and haven't get any idea what is wrong with my 
> configuration. So here is my questions:
>
> 1 - If the netflow configuration is wrong, please point out for me. Or 
> if my concept is wrong, please. :)
> 2 - Do netflow require a kernel module or just user space is enough?
> 3 - If a kernel module is required, so can you suggest me with the 
> good version combination between kernel, ovs and gcc?
>
> Best regards,
> Duy

-- 
-------------------
Bach Ha Duy
INFOTECH Master Program
University of Stuttgart, Germany

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