Distributed mode with multicast enabled don't work.

[Luc Evers]

  Info

   OrientDB version: 2.1.13

   Test:  3 servers on the same lan, running ubuntu (14.04). 

             OrientDB (root password installed), we didn't touch any configuration or database.

        1)     Start dserver.sh  on the three servers, they start as separated servers!  No error reports. (multicast enabled="true")

                Result:  no distributed database, the three orientdb servers are running as separated databases.

        2)      Change hazelcast.html :   multicast enabled="false"    and extend  tcp-ip enbled="true" (fill in the three server ip addresses)

                  Result:  everything works fine, we have now a distributed database.

   Do we need an additional configuration change to start the database in multicast mode?

   We are interested in the multicastmode because in this mode you can add a server on the fly.

   In the other case (tcp-ip) you need to change the hazelcast.xml on all the servers?  (+ reload server)

    

[Luca Son]

Hi Luc,

I tried your case by using Oracle VM VirtualBox and the following configurations:

• 3 nodes and "root" password for each node;
• <multicast enabled="true"> in hazelcast.xml;
  
• other configurations all default.

When I start up the 3 nodes they work correctly as distributed, do you have any other configuration in your environment ?

About your second question, I found this documentation about hazelcast configuration to be TCP/IP cluster.

Hope it helps

Luca

[Luc Evers]

Op zondag 20 maart 2016 12:13:43 UTC+1 schreef Luca Son:

  Strange, de cluster don't work on seperate servers! No config changed, only download , install root password and then start cluster.

 

[Luca Garulli]

Is it working if you configure manual IP addresses?

Best Regards,

Luca Garulli

Founder & CEO

OrientDB

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[Luc Evers]

  Luca,

    If I fill in the ip address in the hazelcast configuration then the cluster starts successful.

    I was following the OrientDB course on Udemy which very good described how to start the cluster via multicast.

    

   Best Regard,

    Luc.

Op woensdag 23 maart 2016 11:36:40 UTC+1 schreef l.garulli:

[Luc Evers]

   Luca,  More information:

  New test with orient : 2.1.15

  Result same problem:  no cluster with my two servers.

  servers A:  ubuntu version 14.04 LTS + docker installed

  

  Second test :  move to another server pair:

  serversB: ubuntu version 12.04 LTS  no docker installed.

  Result:  No problem with multicast enabled="true", the cluster is working fine!

 The difference between the two server pairs is the Ubuntu version and docker is installed in servers A.

  If I shut down docker + docker0 link I got an error from OrientDB that the network was down.

  I think OrientDB has problems with the network configuration if docker is installed.

   

Rem:

    /sbin/ifconfig ->  servers A     -> em1  (= network interface)

                              servers B     -> eth0

     

   

Op woensdag 23 maart 2016 13:58:17 UTC+1 schreef Luc Evers:

[Luc Evers]

  Rem

     Both servers A are working fine in cluster if I use fix Ip addresses, like before.

Op zondag 17 april 2016 16:34:52 UTC+2 schreef Luc Evers:

[Luc Evers]

   Luca,

     Can you try the same test but now with docker installed on the servers?

   Luc.

Op zondag 17 april 2016 16:48:33 UTC+2 schreef Luc Evers:

[Luca Garulli]

Hi Luc,

I guess in the non working cfg, the multicast is simply off.

Best Regards,

Luca Garulli

Founder & CEO

OrientDB

[Luc Evers]

  No, multicast enabled="true"

Op zondag 24 april 2016 17:01:25 UTC+2 schreef l.garulli:

[Luc Evers]

  + The machine can handle multicast.

Op zondag 20 maart 2016 10:19:09 UTC+1 schreef Luc Evers: