[Paraview] A Forward Connection Over two ssh Tunnel

[Utkarsh Ayachit]

Burlen,

Very cool. When you get the chance, mind updating the Wiki?

Thanks
Utkarsh

On Mon, Aug 18, 2014 at 12:37 PM, Burlen Loring <bloring at lbl.gov> wrote:
> Hi Ehsan,
>
> As Utkarsh says you need to use a reverse connection. I suggest ncat instead
> of portfwd because portfwd is a long dead project with no support and it's
> failed to compile on some systems I used. Here's a schematic of the setup
>
> [work station]              [  login node    ]      [ compute node ]
> [  paraview  ]<-- ssh -R --<[ ncat + ncat -l ]<-----[ pvserver -rc ]
>
> in more detail:
> in your pvsc on the client
> ssh -R ${PORT}:localhost:${PORT} ${LOGIN_HOST} ...
>
> on the login node in a shell script referenced by the client's pvsc:
> let LOGIN_PORT=${PORT}+1
> ncat -l ${LOGIN_HOST} ${LOGIN_PORT} --sh-exec="ncat localhost $PORT" &
> qsub ...
>
> on the compute node in your batch script
> mpirun ... pvserver --reverse-connection --client-host ${LOGIN_HOST}
> --server-port ${LOGIN_PORT} ...
>
> You could skip ncat if you have control over the sshd config, you need to
> enable GatewayPorts.
>
> Burlen
>
>
> On 08/18/2014 08:18 AM, Utkarsh Ayachit wrote:
>
> It does boil down to using reverse connection and setting up recursive
> tunnels so that the pvserver and tunnel back to the client. See the
> following on the need for portfwd and how it could potentially be
> helpful here.
>
> http://www.paraview.org/Wiki/Reverse_connection_and_port_forwarding#Reverse_Connection_over_a_Reverse_ssh_Tunnel_with_portfwd
>
> On Mon, Aug 18, 2014 at 11:15 AM, ehsan saei <ehsan.saei at gmail.com> wrote:
>
> Dear Utkarsh,
> Thanks for your respond. I tried the section : " A forward connection over
> an ssh tunnel "
> but it doesn't work. The problem is that I have to ssh to one system and
> then ssh to the cluster again and finally I can submit a job. Do you have
> any other suggestions?
>
> thanks in advance,
> Ehsan
>
>
> On Mon, Aug 18, 2014 at 4:29 PM, Utkarsh Ayachit
> <utkarsh.ayachit at kitware.com> wrote:
>
> This may be of help:
> http://www.paraview.org/Wiki/Reverse_connection_and_port_forwarding
>
> Utkarsh
>
> On Mon, Aug 18, 2014 at 5:52 AM, ehsan saei <ehsan.saei at gmail.com> wrote:
>
> Hi all,
>
> I'm new to paraview. I try to run pvserver on a cluster. The problem is
> that
> I need to ssh twice to get access to the cluster. To use pvserver I
> submit a
> job on the cluster and then I run pvserver using the command
> "mpirun -np 12 pvserver"
> then I pick the name and port from terminal and use it in paraview
> client.
> but paraview can't find the pvserver. Is there any way to establish a
> connection via these two ssh tunnels?
>
> Thanks in advance,
> Ehsan
>
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