[Linux-cluster] VB: CMAN nodes in different LANs

[Terance Dias]

Yes, that is correct. We want to give address of both nodes in the URL and
allow failover to the other node in case the first node fails. So if the
primary node fails, the rgmanager will promote the secondary node to
primary and the application will failover to the new primary node.
Also, our nodes are in Amazon EC2 where it is not possible to have virtual
IP addresses.

Thanks,
Terance.

On Thu, Oct 18, 2012 at 7:00 PM, Binan AL Halabi <binanalhalabi at yahoo.com>wrote:

>
> Hi,
>
> In this case it must be application-level loadbalancing. Is It?
> I think so because i see in your link there ia a list of brokers and they
> are specified by URL so this is application level loadbalancing.
> and you can do it.
>
> The full format of the broker URL is given by this grammar:
>
> url = ["amqp:"][ user ["/" password] "@" ] addr ("," addr)*
> addr = tcp_addr / rmda_addr / ssl_addr / ...
> tcp_addr = ["tcp:"] host [":" port]
> rdma_addr = "rdma:" host [":" port]
> ssl_addr = "ssl:" host [":" port]'
> 		
>
> The URL can be virtual IP (simple case) or URL as above (This what you
> want).
>
> // Binan
>   ------------------------------
> *Från:* Terance Dias <terance at socialtwist.com>
> *Till:* Binan AL Halabi <binanalhalabi at yahoo.com>; linux clustering <
> linux-cluster at redhat.com>
> *Skickat:* torsdag, 18 oktober 2012 14:20
> *Ämne:* Re: [Linux-cluster] CMAN nodes in different LANs
>
> I cannot use Virtual IP addresses since my 2 networks are in different
> geographical locations and therefore the IP cannot be relocated. Is it
> possible to build this cluster without virtual IP addresses?
>
> Thanks,
> Terance.
>
> On Thu, Oct 18, 2012 at 5:06 PM, Binan AL Halabi <binanalhalabi at yahoo.com>wrote:
>
> Hello,
> You can build a cluster with nodes on different LANs but your resource
> manager must support Virtual IP addresses.
> As i see in your link this is supported in the resource manager.
>
> // Binan
>   ------------------------------
> *Från:* Terance Dias <terance at socialtwist.com>
> *Till:* linux clustering <linux-cluster at redhat.com>
> *Skickat:* torsdag, 18 oktober 2012 8:44
> *Ämne:* Re: [Linux-cluster] CMAN nodes in different LANs
>
> Sorry I did not give much context of what I'm trying to do.
>
> I'm trying to set up a cluster of nodes running apache qpid as mentioned
> in the documentation here<http://qpid.apache.org/books/trunk/AMQP-Messaging-Broker-CPP-Book/html/chap-Messaging_User_Guide-Active_Passive_Cluster.html>
> The documentation says that cluster mechanism uses cman and rgmanager but
> does not directly depend on openais or corosync and does not use
> multicasting. It also says "Replication to a *disaster recovery* site can
> be handled as simply another node in the cluster, it does not require a
> separate replication mechanism" . I think by "disaster recovery site" it
> means a different network. I'm very new to clustering so I just wanted to
> know if it is possible to use cman and rgmanager with cluster nodes in
> different networks.
>
> Thanks,
> Terance.
>
> On Thu, Oct 18, 2012 at 2:43 AM, Digimer <lists at alteeve.ca> wrote:
>
> -----BEGIN PGP SIGNED MESSAGE-----
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>
> On 10/17/2012 05:11 PM, Sam Wilson wrote:
> > I might be totally missing something but unless you specify
> > otherwise doesn't cman require layer 2 connectivity between nodes?
> >
> > Cheers,
> >
> > Sam
> >
>
> It normally uses multicast, but you can use unicast with newer
> corosync (I've not tried this). I am not sure if two nodes in separate
> subnets works, I've also never tried this. I have to think it would be
> a bad idea, given the need to fast/stable networking.
>
> - --
> Digimer
> Papers and Projects: https://alteeve.ca/w/
> What if the cure for cancer is trapped in the mind of a person without
> access to education?
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