Re: [jgroups-users] Auto Discovery Question

http://www.jgroups.org/manual/index.html#DiscoveryProtocols

On 26/03/16 12:15, Questions/problems related to using JGroups wrote:
> I have more development of the story on my side.
> I was running the tests on my nodes, and the only way I managed them to
> work was this:
>
> Receiver:
> java -cp jgroups-all.jar org.jgroups.tests.McastReceiverTest -mcast_addr
> 224.0.0.0 -port 45588
>
> Sender:
> java -cp ../ccio-image.jar org.jgroups.tests.McastSenderTest -mcast_addr
> [IP_OF_RECEIVER] -port 45588
>
> Well, it doesn't look right, so I've contacted the customer support, and
> got the response:
> ````
> There has been a response to your ticket:
>
> Hello,
>
> Thank you for getting in contact with us via this ticket!
>
> I apologize for any inconveniences this may cause you however our
> droplets do not support Multicast IPs. It would be dropped at the
> hypervisor level, and woulld not be able to be utilized.
> ````
>
> Looks like I cannot use multicast at all. But I still need autodiscovery
> in some way. The crucial part of the cluster idea is the ability
> for nodes to find each other with minimum configuration. So I thought,
> maybe there is a way to provide some seed hosts, which would provide the
> information about all nodes to the joined node? Or maybe there is better
> way to do this?
> Ideally, I'd like the nodes just to start up and find
> the cluster members automatically.
>
> Thanks,
> Eugene
>
>
> On Fri, Mar 25, 2016 at 5:39 PM, Eugene Strokin <[email protected]
> <mailto:[email protected]>> wrote:
>
>     Hello,
>     my cluster does a simple thing:
>     - a node is asking everybody - "do you have this thing?"
>     - if yes - "give it to me"
>     - if not - "I'll make it myself"
>
>     It is all done via RpcDispatcher and everything works well on my
>     local machine, when I'm running all the nodes locally.
>
>     Once I've deployed it on the Virtual Machines in Data Center
>     (Digital Ocean), my nodes stopped seeing each other.
>
>     I've tried to troubleshoot by following the documentation, but I'm
>     no Linux/LAN expert.
>     I guess I need to set up my Linux (CentOS) to support unicast, or
>     something like this.
>     Could you point me to some direction, where I could find exactly
>     what I need? Or better if there is a step by step documentation of
>     how to enable Linux Cluster work with JGroups?
>
>     BTW: I'm using default configuration udp.xml, maybe I could use some
>     other config file, which would make my life easier running the
>     cluster in a Data Center?
>
>     Thanks in advance,
>     Eugene
>
>
>
>
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-- 
Bela Ban, JGroups lead (http://www.jgroups.org)


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