Re: [ovirt-users] Problemas with ovirtmgmt network used to connect VMs

[FERNANDO FREDIANI]

Hello.

Despite I didn't get any feedback on this topic anymore I just wanted to 
let people know that since I moved the VM to another oVirt Cluster 
running oVirt-Node-NG and Kernel 3.10 the problem stopped happening. 
Although I still don't know the cause of it I suspect it may have to do 
with the kernel that other Host (hypervsior) is running (4.12) as that 
is the only once running disk kernel for an specific reason.
To support this suspicious in the past I had another Hypervisor also 
running kernel 4.12 and a VM that does that same job had the same issue. 
After I have rebooted the Hypervisor back to default kernel (3.10) the 
problem didn't happen anymore.


If anyone ever faces this or anything similar please let me know as I am 
always interested to find out the root of this issue.


Regards
Fernando


On 28/07/2017 15:01, FERNANDO FREDIANI wrote:


Hello Edwardh and all.

I keep getting these disconnects, were you able to find anything about 
to suggest changing ?


As I mentioned this machine different from the others where it never 
happened uses the ovirtmgmt network as VM network and has kernel 4.12 
instead of the default 3.10 from CentOS 7.3. It seems a particular 
situation that is triggering this behavior but could not gather any 
hint yet.


I have tried to run a regular arping to force the bridge always learn 
the VMs MAC address but it doesn't seem to work and every in a while 
the bridge 'forgets' that particular VM mac address.
I have also even rebuilt the VM completely changing its operating 
system from Ubuntu 16.04 to CentOS 7.3 and the same problem happened.


Fernando


On 24/07/2017 18:20, FERNANDO FREDIANI wrote:


Hello Edward, this happened again today and I was able to check more 
details.


So:

- The VM stopped passing any network traffic.
- Checking 'brctl showmacs ovirtmgmt' it showed the VM's mac address 
missing.
- I then went to oVirt Engine, under VM's 'Network Interfaces' tab, 
clicked Edit and changed the Link State to Down then to Up and it 
recovered its connectivity.
- Another 'brctl showmacs ovirtmgmt' showed the VM's mac address 
learned again by the bridge.


This Node server has the particularity of sharing the ovirtmgmt with 
VMs. Could it possibly be the cause of the issue in any way ?


Thanks
Fernando


On 24/07/2017 09:47, FERNANDO FREDIANI wrote:


Not tried this yet Edwardh, but will do at next time it happens. THe 
source mac address should be the mac as the VM. I don't see any 
reason for it to change from within the VM ou outside.


What type of things would make the bridge stop learning a given VM 
mac address ?


Fernando


On 23/07/2017 07:51, Edward Haas wrote:
Have you tried to use tcpdump at the VM vNIC to examine if there is 
traffic trying to get out from there? And with what source mac address?


Thanks,
Edy,

On Fri, Jul 21, 2017 at 5:36 PM, FERNANDO FREDIANI 
> wrote:


Has anyone had problem when using the ovirtmgmt bridge to
connect VMs ?

I am still facing a bizarre problem where some VMs connected to
this bridge stop passing traffic. Checking the problem further
I see its mac address stops being learned by the bridge and the
problem is resolved only with a VM reboot.

When I last saw the problem I run brctl showmacs ovirtmgmt and
it shows me the VM's mac adress with agening timer 200.19.
After the VM reboot I see the same mac with agening timer 0.00.
I don't see it in another environment where the ovirtmgmt is
not used for VMs.

Does anyone have any clue about this type of behavior ?

Fernando
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Re: [ovirt-users] Problemas with ovirtmgmt network used to connect VMs

[Edward Haas]

Hello Fernando,

Have you taken the tcpdump in the VM to see what traffic is sent out?
Your host is a Centos 7.3? If so how come it has such a kernel version?

Have you see anything in /var/log/messages when it gets disconnected?

Thanks,
Edy.


On Fri, Jul 28, 2017 at 9:01 PM, FERNANDO FREDIANI <
fernando.fredi...@upx.com> wrote:

> Hello Edwardh and all.
>
> I keep getting these disconnects, were you able to find anything about to
> suggest changing ?
>
> As I mentioned this machine different from the others where it never
> happened uses the ovirtmgmt network as VM network and has kernel 4.12
> instead of the default 3.10 from CentOS 7.3. It seems a particular
> situation that is triggering this behavior but could not gather any hint
> yet.
>
> I have tried to run a regular arping to force the bridge always learn the
> VMs MAC address but it doesn't seem to work and every in a while the bridge
> 'forgets' that particular VM mac address.
> I have also even rebuilt the VM completely changing its operating system
> from Ubuntu 16.04 to CentOS 7.3 and the same problem happened.
>
> Fernando
>
> On 24/07/2017 18:20, FERNANDO FREDIANI wrote:
>
> Hello Edward, this happened again today and I was able to check more
> details.
>
> So:
>
> - The VM stopped passing any network traffic.
> - Checking 'brctl showmacs ovirtmgmt' it showed the VM's mac address
> missing.
> - I then went to oVirt Engine, under VM's 'Network Interfaces' tab,
> clicked Edit and changed the Link State to Down then to Up and it recovered
> its connectivity.
> - Another 'brctl showmacs ovirtmgmt' showed the VM's mac address learned
> again by the bridge.
>
> This Node server has the particularity of sharing the ovirtmgmt with VMs.
> Could it possibly be the cause of the issue in any way ?
>
> Thanks
> Fernando
>
> On 24/07/2017 09:47, FERNANDO FREDIANI wrote:
>
> Not tried this yet Edwardh, but will do at next time it happens. THe
> source mac address should be the mac as the VM. I don't see any reason for
> it to change from within the VM ou outside.
>
> What type of things would make the bridge stop learning a given VM mac
> address ?
>
> Fernando
>
> On 23/07/2017 07:51, Edward Haas wrote:
>
> Have you tried to use tcpdump at the VM vNIC to examine if there is
> traffic trying to get out from there? And with what source mac address?
>
> Thanks,
> Edy,
>
> On Fri, Jul 21, 2017 at 5:36 PM, FERNANDO FREDIANI <
> fernando.fredi...@upx.com> wrote:
>
>> Has anyone had problem when using the ovirtmgmt bridge to connect VMs ?
>>
>> I am still facing a bizarre problem where some VMs connected to this
>> bridge stop passing traffic. Checking the problem further I see its mac
>> address stops being learned by the bridge and the problem is resolved only
>> with a VM reboot.
>>
>> When I last saw the problem I run brctl showmacs ovirtmgmt and it shows
>> me the VM's mac adress with agening timer 200.19. After the VM reboot I see
>> the same mac with agening timer 0.00.
>> I don't see it in another environment where the ovirtmgmt is not used for
>> VMs.
>>
>> Does anyone have any clue about this type of behavior ?
>>
>> Fernando
>> ___
>> Users mailing list
>> Users@ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
>
>
>
>
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Users@ovirt.org
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Re: [ovirt-users] Problemas with ovirtmgmt network used to connect VMs

[FERNANDO FREDIANI]

Hello Edwardh and all.

I keep getting these disconnects, were you able to find anything about 
to suggest changing ?


As I mentioned this machine different from the others where it never 
happened uses the ovirtmgmt network as VM network and has kernel 4.12 
instead of the default 3.10 from CentOS 7.3. It seems a particular 
situation that is triggering this behavior but could not gather any hint 
yet.


I have tried to run a regular arping to force the bridge always learn 
the VMs MAC address but it doesn't seem to work and every in a while the 
bridge 'forgets' that particular VM mac address.
I have also even rebuilt the VM completely changing its operating system 
from Ubuntu 16.04 to CentOS 7.3 and the same problem happened.


Fernando


On 24/07/2017 18:20, FERNANDO FREDIANI wrote:


Hello Edward, this happened again today and I was able to check more 
details.


So:

- The VM stopped passing any network traffic.
- Checking 'brctl showmacs ovirtmgmt' it showed the VM's mac address 
missing.
- I then went to oVirt Engine, under VM's 'Network Interfaces' tab, 
clicked Edit and changed the Link State to Down then to Up and it 
recovered its connectivity.
- Another 'brctl showmacs ovirtmgmt' showed the VM's mac address 
learned again by the bridge.


This Node server has the particularity of sharing the ovirtmgmt with 
VMs. Could it possibly be the cause of the issue in any way ?


Thanks
Fernando


On 24/07/2017 09:47, FERNANDO FREDIANI wrote:


Not tried this yet Edwardh, but will do at next time it happens. THe 
source mac address should be the mac as the VM. I don't see any 
reason for it to change from within the VM ou outside.


What type of things would make the bridge stop learning a given VM 
mac address ?


Fernando


On 23/07/2017 07:51, Edward Haas wrote:
Have you tried to use tcpdump at the VM vNIC to examine if there is 
traffic trying to get out from there? And with what source mac address?


Thanks,
Edy,

On Fri, Jul 21, 2017 at 5:36 PM, FERNANDO FREDIANI 
> wrote:


Has anyone had problem when using the ovirtmgmt bridge to
connect VMs ?

I am still facing a bizarre problem where some VMs connected to
this bridge stop passing traffic. Checking the problem further I
see its mac address stops being learned by the bridge and the
problem is resolved only with a VM reboot.

When I last saw the problem I run brctl showmacs ovirtmgmt and
it shows me the VM's mac adress with agening timer 200.19. After
the VM reboot I see the same mac with agening timer 0.00.
I don't see it in another environment where the ovirtmgmt is not
used for VMs.

Does anyone have any clue about this type of behavior ?

Fernando
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Re: [ovirt-users] Problemas with ovirtmgmt network used to connect VMs

[Edward Haas]

On Tue, Jul 25, 2017 at 12:20 AM, FERNANDO FREDIANI <
fernando.fredi...@upx.com> wrote:

> Hello Edward, this happened again today and I was able to check more
> details.
>
> So:
>
> - The VM stopped passing any network traffic.
> - Checking 'brctl showmacs ovirtmgmt' it showed the VM's mac address
> missing.
> - I then went to oVirt Engine, under VM's 'Network Interfaces' tab,
> clicked Edit and changed the Link State to Down then to Up and it recovered
> its connectivity.
> - Another 'brctl showmacs ovirtmgmt' showed the VM's mac address learned
> again by the bridge.
>
> This Node server has the particularity of sharing the ovirtmgmt with VMs.
> Could it possibly be the cause of the issue in any way ?
>
There is nothing special with ovirtmgmt bridge in this regard.
I suggest you check the VM itself to see if it tries to send traffic, the
fact that the mac is not appearing on the bridge table is an outcome of no
traffic passing from the vNIC with that source mac address.

Thanks
> Fernando
>
> On 24/07/2017 09:47, FERNANDO FREDIANI wrote:
>
> Not tried this yet Edwardh, but will do at next time it happens. THe
> source mac address should be the mac as the VM. I don't see any reason for
> it to change from within the VM ou outside.
>
> What type of things would make the bridge stop learning a given VM mac
> address ?
>
> Fernando
>
> On 23/07/2017 07:51, Edward Haas wrote:
>
> Have you tried to use tcpdump at the VM vNIC to examine if there is
> traffic trying to get out from there? And with what source mac address?
>
> Thanks,
> Edy,
>
> On Fri, Jul 21, 2017 at 5:36 PM, FERNANDO FREDIANI <
> fernando.fredi...@upx.com> wrote:
>
>> Has anyone had problem when using the ovirtmgmt bridge to connect VMs ?
>>
>> I am still facing a bizarre problem where some VMs connected to this
>> bridge stop passing traffic. Checking the problem further I see its mac
>> address stops being learned by the bridge and the problem is resolved only
>> with a VM reboot.
>>
>> When I last saw the problem I run brctl showmacs ovirtmgmt and it shows
>> me the VM's mac adress with agening timer 200.19. After the VM reboot I see
>> the same mac with agening timer 0.00.
>> I don't see it in another environment where the ovirtmgmt is not used for
>> VMs.
>>
>> Does anyone have any clue about this type of behavior ?
>>
>> Fernando
>> ___
>> Users mailing list
>> Users@ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
>
>
>
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Users@ovirt.org
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Re: [ovirt-users] Problemas with ovirtmgmt network used to connect VMs

[FERNANDO FREDIANI]

Hello Edward, this happened again today and I was able to check more 
details.


So:

- The VM stopped passing any network traffic.
- Checking 'brctl showmacs ovirtmgmt' it showed the VM's mac address 
missing.
- I then went to oVirt Engine, under VM's 'Network Interfaces' tab, 
clicked Edit and changed the Link State to Down then to Up and it 
recovered its connectivity.
- Another 'brctl showmacs ovirtmgmt' showed the VM's mac address learned 
again by the bridge.


This Node server has the particularity of sharing the ovirtmgmt with 
VMs. Could it possibly be the cause of the issue in any way ?


Thanks
Fernando


On 24/07/2017 09:47, FERNANDO FREDIANI wrote:


Not tried this yet Edwardh, but will do at next time it happens. THe 
source mac address should be the mac as the VM. I don't see any reason 
for it to change from within the VM ou outside.


What type of things would make the bridge stop learning a given VM mac 
address ?


Fernando


On 23/07/2017 07:51, Edward Haas wrote:
Have you tried to use tcpdump at the VM vNIC to examine if there is 
traffic trying to get out from there? And with what source mac address?


Thanks,
Edy,

On Fri, Jul 21, 2017 at 5:36 PM, FERNANDO FREDIANI 
> wrote:


Has anyone had problem when using the ovirtmgmt bridge to connect
VMs ?

I am still facing a bizarre problem where some VMs connected to
this bridge stop passing traffic. Checking the problem further I
see its mac address stops being learned by the bridge and the
problem is resolved only with a VM reboot.

When I last saw the problem I run brctl showmacs ovirtmgmt and it
shows me the VM's mac adress with agening timer 200.19. After the
VM reboot I see the same mac with agening timer 0.00.
I don't see it in another environment where the ovirtmgmt is not
used for VMs.

Does anyone have any clue about this type of behavior ?

Fernando
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Re: [ovirt-users] Problemas with ovirtmgmt network used to connect VMs

[FERNANDO FREDIANI]

Not tried this yet Edwardh, but will do at next time it happens. THe 
source mac address should be the mac as the VM. I don't see any reason 
for it to change from within the VM ou outside.


What type of things would make the bridge stop learning a given VM mac 
address ?


Fernando


On 23/07/2017 07:51, Edward Haas wrote:
Have you tried to use tcpdump at the VM vNIC to examine if there is 
traffic trying to get out from there? And with what source mac address?


Thanks,
Edy,

On Fri, Jul 21, 2017 at 5:36 PM, FERNANDO FREDIANI 
> wrote:


Has anyone had problem when using the ovirtmgmt bridge to connect
VMs ?

I am still facing a bizarre problem where some VMs connected to
this bridge stop passing traffic. Checking the problem further I
see its mac address stops being learned by the bridge and the
problem is resolved only with a VM reboot.

When I last saw the problem I run brctl showmacs ovirtmgmt and it
shows me the VM's mac adress with agening timer 200.19. After the
VM reboot I see the same mac with agening timer 0.00.
I don't see it in another environment where the ovirtmgmt is not
used for VMs.

Does anyone have any clue about this type of behavior ?

Fernando
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Re: [ovirt-users] Problemas with ovirtmgmt network used to connect VMs

[Edward Haas]

Have you tried to use tcpdump at the VM vNIC to examine if there is traffic
trying to get out from there? And with what source mac address?

Thanks,
Edy,

On Fri, Jul 21, 2017 at 5:36 PM, FERNANDO FREDIANI <
fernando.fredi...@upx.com> wrote:

> Has anyone had problem when using the ovirtmgmt bridge to connect VMs ?
>
> I am still facing a bizarre problem where some VMs connected to this
> bridge stop passing traffic. Checking the problem further I see its mac
> address stops being learned by the bridge and the problem is resolved only
> with a VM reboot.
>
> When I last saw the problem I run brctl showmacs ovirtmgmt and it shows me
> the VM's mac adress with agening timer 200.19. After the VM reboot I see
> the same mac with agening timer 0.00.
> I don't see it in another environment where the ovirtmgmt is not used for
> VMs.
>
> Does anyone have any clue about this type of behavior ?
>
> Fernando
> ___
> Users mailing list
> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
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[ovirt-users] Problemas with ovirtmgmt network used to connect VMs

[FERNANDO FREDIANI]

Has anyone had problem when using the ovirtmgmt bridge to connect VMs ?

I am still facing a bizarre problem where some VMs connected to this 
bridge stop passing traffic. Checking the problem further I see its mac 
address stops being learned by the bridge and the problem is resolved 
only with a VM reboot.


When I last saw the problem I run brctl showmacs ovirtmgmt and it shows 
me the VM's mac adress with agening timer 200.19. After the VM reboot I 
see the same mac with agening timer 0.00.
I don't see it in another environment where the ovirtmgmt is not used 
for VMs.


Does anyone have any clue about this type of behavior ?

Fernando
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