Mailing List Archive

On Thu, Jun 26, 2014 at 01:13:22PM +0200, Daniel Thielking wrote:
> Dear members!
> I have a problem with our cluster.
> We have two nodes each has an IP and one more IP for the cluster.
> All our resources are on node-1 and node-2 is our slave one. But if
> I ping from node-1 to any other machine he is using the cluster-IP
> and not his own IP do you know how to fix that?

typically because of source routing or SNAT.

check iptables-save | grep SNAT
and
ip route show
ip route get $dest_ip

(look for "src ...")

In many cases you *want* outgoing packets from the "service" IP address.

You could use ip route to make them use the node address
to contact the other nodes, but use the service address
to contact clients.

--
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
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Thanks for your help.

Yes we are using SNAT.

Output of : iptables-save | grep SNAT
-A POSTROUTING -o eth0 -j SNAT --to-source 'cluster-ip'

It seems that all our traffic is routet to the cluster-ip right?

What i want is, if I use tools direct from the node he should only use
his own IP.
If the cluster gets an request on the cluster-ip he should answer with it.

Could you give me some more hints to do that.

_____________________________________________________

Auszubildender Fachinformatiker für Systemintegration
RWTH Aachen
Lehrstuhl für Integrierte Analogschaltungen
Raum 24C 313
Walter-Schottky-Haus
Sommerfeldstr. 24
D-52074 Aachen

www.ias.rwth-aachen.de

Email: Daniel.Thielking@ias.rwth-aachen.de
Phone: +49-(0)241-80-27771
FAX: +49-(0)241-80-627771
_____________________________________________________

Am 26.06.2014 13:22, schrieb Lars Ellenberg:
> On Thu, Jun 26, 2014 at 01:13:22PM +0200, Daniel Thielking wrote:
>> Dear members!
>> I have a problem with our cluster.
>> We have two nodes each has an IP and one more IP for the cluster.
>> All our resources are on node-1 and node-2 is our slave one. But if
>> I ping from node-1 to any other machine he is using the cluster-IP
>> and not his own IP do you know how to fix that?
> typically because of source routing or SNAT.
>
> check iptables-save | grep SNAT
> and
> ip route show
> ip route get $dest_ip
>
> (look for "src ...")
>
> In many cases you *want* outgoing packets from the "service" IP address.
>
> You could use ip route to make them use the node address
> to contact the other nodes, but use the service address
> to contact clients.
>

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