Re: [vizstack-users] Configuring VizStack - TurboVNC server failed to start - Problem

[Kumar, S. <shr...@hp...>]

Hi Cristi,

Bad guess! Ok - so now we have to look deeper. Thanks for the additional information.

VizStack runs a daemon on port 50000 by default. The scripts from the other nodes connect to this daemon. Please ensure that your virtual machine is not blocking this connection. If this port is being blocked, then open it and then retry the viz-tvnc script.

Next, try running /opt/vizstack/sbin/vs-test-gpus. This should return successfully.

If all these do not fix the problem, then make a copy of /opt/vizstack/bin/viz-tvnc. Edit the file. Locate the line

 tvncProc = sched.run(cmd, errFile = open("/dev/null","w")) 

And edit it to see the error messages

 tvncProc = sched.run(cmd)

Run the edited copy of viz-tvnc. You will see error messages. Pass them on to me to have a look.

Regards
-- Shree

-----Original Message-----
From: Cristi Mocan [mailto:Cri...@ne...] 
Sent: Thursday, January 20, 2011 9:56 PM
To: viz...@li...
Subject: Re: [vizstack-users] Configuring VizStack - TurboVNC server failed to start - Problem

First of all I would like to present my hardware configuration.

I have a cluster that consists:
- node0 (server - master node -SSM)
- node1, node2 (rendering nodes)

I have to mention that my master node is a Virtual Machine and does not have a GPU. The rendering nodes have NVIDIA GTS 8800. All the nodes have
OS: Ubuntu Server 10.04

I would like to add that I had tested the VNC server (classical way) and is working fine on each node (node0, node1, node2).

/opt/TurboVNC/bin/vncserver

I was asking for a password on each node. On every node I have the same user and the home directory contains the same /.vnc folder with the same passwd file. So, I have the same user & VNC password everywhere in the cluster.

I don't know why is not working using Vizstack....

After I run the config:
/opt/vizstack/sbin/vs-configure-system -s slurm node[1-2] and start the SSM: /opt/vizstack/sbin/vs-ssm start

When I run:
viz-tvnc
The result is the same:
Starting Desktop with resolution 1280x1024 TurboVNC server failed to start.

I receive the same result even if I try with:
/opt/vizstack/sbin/vs-configure-system -s slurm node1 or /opt/vizstack/sbin/vs-configure-system -s slurm node2

I received the same result if I tried the standalone config from node1 or
node2:
/opt/vizstack/sbin/vs-configure-standalone

I would appreciate if you can give me some more information about how I should setup Vizstack or TurboVNC user pass...

Thank you in advance !

Cheers,
Cristi

----------------------------------------------------------------------------
From: Kumar, Shree <shreekumar@hp...> - 2011-01-20 04:48

Hi Cristi,

Looks like a commonn cluster setup issue to me.

>From your earlier email, I can see that VizStack is managing GPUs on 
>two
systems cgis[1-2]. When you run viz-tvnc, it tries to start a TurboVNC server on one of those systems. If a TurboVNC server cannot be started on those nodes, then the script will fail.

You have already setup a password on your local machine (the machine where you ran the configure scrpt - cgis0, perhaps), so the server is starting up just fine.

Interestingly, startup can fail on a per-user basis. If a user has not assigned a vnc password, then the server will not start. If you try to start the TurboVNC server on any of the nodes cgis[1-2], you will find that it prompts you for a password. Can you confirm that this is the issue ?

If you find that this is indeed the issue, then you will have to ensure that every user who wants to use TurboVNC will have to set a password on every machine. If you have shared home directories, then they need to set the password atleast once.

Regards
-- Shree



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