[Spread-users] need help with spread configuration on VMs cluster

[Tarashchanskiy, Yevgeniy]

Hi John,

I set up logging and figured out the problem.
The essence of the problem was "message too long" error.
I found a similar case in archive in Oct 2004 that stated that problem is 64-bits build.
Executables for the latest 4.1.0 version caused the problem, so I picked up images of 4.0.0 build (I don't remember if I built them or they were a part of the package) and was able to do basic configuration and communication for three VMs on my cluster.
I would appreciate the explanation of the problem. 
Is it version related?

Thanks,
Yev.


-----Original Message-----
From: John Schultz [mailto:jschultz at spreadconcepts.com] 
Sent: Wednesday, April 24, 2013 9:55 AM
To: Tarashchanskiy, Yevgeniy
Cc: spread-users at lists.spread.org
Subject: Re: [Spread-users] need help with spread configuration on VMs cluster

As a first guess, it is possible that your spread segment address is wrong.

Is the broadcast address for your virtual network really 10.243.111.255?  Or should it be 10.243.105.255?

You could also try a multicast address rather than a broadcast address (e.g. - 227.1.2.3).

I would also check that all your virtual machines can talk to each other directly using ping or the spsend and sprecv programs using the addresses in your configuration.

You can definitely have IPC without using a loopback/127.0.0.1 entry.  So long as a singleton daemon starts up and the local clients can connect to it, then IPC should work.  If you have a multiple daemon configuration then IPC will still work, however, it might seem to hang if the daemons are struggling to establish a membership and can't finish, which can happen when your network + spread configuration aren't proper.

Cheers!

-----
John Lane Schultz
Spread Concepts LLC
Phn: 301 830 8100
Cell: 443 838 2200

On Apr 23, 2013, at 10:19 AM, Tarashchanskiy, Yevgeniy wrote:

Hi,
 
I am a newbie. I am trying to do simplest things to evaluate if I can use spread in my project.
I have a segment of several virtual machines that should talk to each other plus I would like to use spread for IPC between servers and clients on every VM.
I created very simple configuration file:
 
Spread_Segment 10.243.111.255{
        localhost1      10.243.105.19
        localhost1      10.243.105.20
        localhost1      10.243.105.21
        localhost1      10.243.105.22
}
 
At best two VMs can finish configuration and "see" each other:
 
Num Segments 1
        2       10.243.111.255   4803
                localhost2              10.243.105.20
                localhost4              10.243.105.22
 
In most of the attempts only one VM finish configuration and other VMs print the line:
"Conf_load_conf_file: My name: . . ., port 4803"
and stop.
 
I can start spuser(s) on VMs but they can't send messages to each other.
( My initial testing on one VM with configuration file that include line:
"loopback               127.0.0.1"
allowed me to create a common group to several spusers and send messages to a group)
 
I need help to understand what can be wrong with configuration and how I can figure out my problems?
Can I have IPC without loopback?
 
Thanks,
Yev.
 
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