Re: [jgroups-users] Auto Discovery Question

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]> 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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