Mailing List Archive: [lvs-users] Particular behavior in 4 nodes setup

[lvs-users] Particular behavior in 4 nodes setup

Apr 22, 2013, 6:09 AM

Post #1 of 4 (993 views)

Hello guys, I have this setup:

IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP mx-vip-01:25 wrr
-> mx-node-01:25 Route 1 0 0
-> mx-node-02:25 Route 1 0 0
-> mx-node-03:25 Route 1 0 0
-> mx-node-04:25 Route 1 0 0

But when I check incoming connections from the MTAs only 2 nodes work and 2
stay idle.

They are all virtual machines w/ clones from the same template, this
behavior occurs a little after ipvsadm is set up.

2 random nodes "work" and 2 "rest", how should or can I debug this? Since
RR should provide me a 25% coverage on all nodes, right?

If any more info is needed, just say.

Thank you in advice,

Kind Regards,

--
[ ]'s

Filipe Cifali Stangler
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Re: [lvs-users] Particular behavior in 4 nodes setup [ In reply to ]

graeme at graemef

Apr 23, 2013, 2:05 AM

Post #2 of 4 (929 views)

Permalink

On Mon, 2013-04-22 at 10:09 -0300, Filipe Cifali wrote:
> But when I check incoming connections from the MTAs only 2 nodes work and 2
> stay idle.

It sounds like a variant of the "ARP problem".

Is the traffic going directly to the MX servers, rather than through the
director?

Graeme

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Re: [lvs-users] Particular behavior in 4 nodes setup [ In reply to ]

cifali.filipe at gmail

Apr 23, 2013, 4:44 AM

Post #3 of 4 (926 views)

Permalink

I'll check, I should use ipvsadm -c --rate --stats to see how te traffic
flows?

I set them as gateway and the 2 nodes that are active fully work w/o
problems.

2013/4/23 Graeme Fowler <graeme@graemef.net>

> On Mon, 2013-04-22 at 10:09 -0300, Filipe Cifali wrote:
> > But when I check incoming connections from the MTAs only 2 nodes work
> and 2
> > stay idle.
>
> It sounds like a variant of the "ARP problem".
>
> Is the traffic going directly to the MX servers, rather than through the
> director?
>
> Graeme
>
>
> _______________________________________________
> Please read the documentation before posting - it's available at:
> http://www.linuxvirtualserver.org/
>
> LinuxVirtualServer.org mailing list - lvs-users@LinuxVirtualServer.org
> Send requests to lvs-users-request@LinuxVirtualServer.org
> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
>

--
[ ]'s

Filipe Cifali Stangler
_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/

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Re: [lvs-users] Particular behavior in 4 nodes setup [ In reply to ]

cifali.filipe at gmail

Apr 26, 2013, 11:38 AM

Post #4 of 4 (923 views)

Permalink

The traffic flows from director to MX servers, then the MX servers take the
connection for themselves.

They are all VMs deployed from the same template.

Still, I keep getting this strange behavior... A TCPDump shows not a single
TCP/UDP/Anything for 2 servers "idle".

2013/4/23 Filipe Cifali <cifali.filipe@gmail.com>

> I'll check, I should use ipvsadm -c --rate --stats to see how te traffic
> flows?
>
> I set them as gateway and the 2 nodes that are active fully work w/o
> problems.
>
>
> 2013/4/23 Graeme Fowler <graeme@graemef.net>
>
>> On Mon, 2013-04-22 at 10:09 -0300, Filipe Cifali wrote:
>> > But when I check incoming connections from the MTAs only 2 nodes work
>> and 2
>> > stay idle.
>>
>> It sounds like a variant of the "ARP problem".
>>
>> Is the traffic going directly to the MX servers, rather than through the
>> director?
>>
>> Graeme
>>
>>
>> _______________________________________________
>> Please read the documentation before posting - it's available at:
>> http://www.linuxvirtualserver.org/
>>
>> LinuxVirtualServer.org mailing list - lvs-users@LinuxVirtualServer.org
>> Send requests to lvs-users-request@LinuxVirtualServer.org
>> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
>>
>
>
>
> --
> [ ]'s
>
> Filipe Cifali Stangler
>

--
[ ]'s

Filipe Cifali Stangler
_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/

LinuxVirtualServer.org mailing list - lvs-users@LinuxVirtualServer.org
Send requests to lvs-users-request@LinuxVirtualServer.org
or go to http://lists.graemef.net/mailman/listinfo/lvs-users