Re: change IP address of working gluster cluster

[Attila Heidrich <attila.heidrich@xxxxxxxxx>]

Thanks a lot answering!

Assymetric route is not an option - I guess; there are just two bricks at the moment, I have changed hosts file for both.

Will look after the config files, thanks a lot again! Later on I will use IP addresses for being sure :)

Regards,
Attila

2014-07-10 11:28 GMT+02:00 Jonathan Barber <jonathan.barber@xxxxxxxxx>:

On 10 July 2014 09:51, Anders Blomdell <anders.blomdell@xxxxxxxxxxxxxx> wrote:

On 2014-07-10 10:11, Attila Heidrich wrote:
> Hi!
>
> I have seen, that someone else is having tha same problem, but he received
> no answer at all.
> http://gluster.org/pipermail/gluster-users/2014-March/039421.html
>
> We have got the same problem. There are two NICs in all boxes, 1G and 10G,
> and we started just the 1G, but now would like to use the other.
>
> IP addresses/networks are different (of course) and there are running
> services in the cluster.
>
> Is there a way to work out this easily?
>
> I'm pretty sure I can add new nodes on the new network and later remove the
> old ones, but it would be nicer to have some way for changing connect data
> of the same nodes.

If you want clients to use the 1G links, and servers to talk via the 10G links,
'ip route add <dest> src <1G address> dev <10G interface>' on all server might help.

Will that not cause asymmetric flows? The traffic will leave via the 10GbE interface, but the destination IP is still the 1GbE interface, so it will arrive at the 1GbE interface on the other host.

You can change the /etc/hosts entries, replacing the entries for the 1GbE IP with the 10GbE IP and then restarting the gluster processes.

You could mess about with iptables and NAT, but I think at that point you might as well add/remove the hosts.

I guess you can also update the configuration files under /var/lib/glusterfs and rename the brick files... You might want to test that first though :)

Cheers

/Anders

--
Anders Blomdell                  Email: anders.blomdell@xxxxxxxxxxxxxx
Department of Automatic Control
Lund University                  Phone:    +46 46 222 4625
P.O. Box 118                     Fax:      +46 46 138118
SE-221 00 Lund, Sweden

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--
Jonathan Barber <jonathan.barber@xxxxxxxxx>

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