Re: [Dmtcp-forum] Checkpointing sshd error with pty

[Kapil A. <ka...@cc...>]

I was trying to create the setup. I copied the sshd_config file and
updated the port number and key location in it. However, when I try to
connect, the connection is created but it disconnects right away. What
am I missing here? Can you send me your copy of sshd_config?

-- Kapil

On Mon, Mar 7, 2011 at 7:22 PM, Kapil Arya <ka...@cc...> wrote:
> Thanks Elliott for the information.
> I expect to try your setup in a couple of days and write you back my
> findings.
> Thanks,
> -Kapil
>
> On Mon, Mar 7, 2011 at 6:36 PM, Elliott Slaughter
> <ell...@gm...> wrote:
>>
>> Minor correction: I was testing Ubuntu 10.04, not Fedora. Everything else
>> in my last email is correct to my knowledge.
>>
>> On Mon, Mar 7, 2011 at 3:32 PM, Elliott Slaughter
>> <ell...@gm...> wrote:
>>>
>>> I know on the supported apps page ssh sessions are listed as not
>>> supported, but I wanted to try checkpointing sshd and ssh at the same time
>>> to see if that would work.
>>> I go into more details below, but the result is that I'm getting the
>>> following pty error. I don't really know DMTCP internals very well, but I
>>> would have expected this aspect of ssh to work properly, since screen works
>>> fine. Thoughts?
>>> [17968] ERROR at connectionmanager.cpp:197 in fdToDevice;
>>> REASON='JASSERT(i != _table.end()) failed'
>>>      fd = 9
>>>      device = /dev/ptmx
>>>      deviceName = ptmx[/dev/pts/3]:/dev/ptmx
>>>      ptsNameStr = /dev/pts/3
>>> Message: Device not found in connection list
>>> mysshd (17968): Terminating...
>>> Here is more information about my setup and what I'm doing, in case any
>>> of this is relevant:
>>> My setup is as follows:
>>> $ ls ~/sshd
>>> myssh   ssh_host_rsa_key      sshd_config   start_sshd.sh
>>> mysshd  ssh_host_rsa_key.pub  start_ssh.sh
>>> $ cat start_sshd.sh
>>> dmtcp_checkpoint /home/elliott/sshd/mysshd -f
>>> /home/elliott/sshd/sshd_config
>>> $ cat start_ssh.sh
>>> dmtcp_checkpoint /home/elliott/sshd/myssh -p 2222 elliott@localhost
>>> The files myssh and mysshd were copied from /usr/bin/ssh and
>>> /usr/sbin/sshd (installed via Fedora's package manager). ssh_host_rsa_key is
>>> a new key pair I generated for my experiments. sshd_config is a copy of
>>> /etc/ssh/sshd_config, modified to change the port number and key location.
>>> My process is to run dmtcp_coordinator, then run ./start_sshd.sh, and
>>> finally run ./start_ssh.sh. Once I run that final command, I see the crash
>>> (in the window where I ran ./start_sshd.sh). These commands work properly
>>> when run without DMTCP.
>>> I am running Fedora 14 with DMTCP 1.2.0.
>>> Let me know if I can provide you with any other information.
>>> --
>>> Elliott Slaughter
>>>
>>> "Don't worry about what anybody else is going to do. The best way to
>>> predict the future is to invent it." - Alan Kay
>>
>>
>>
>> --
>> Elliott Slaughter
>>
>> "Don't worry about what anybody else is going to do. The best way to
>> predict the future is to invent it." - Alan Kay
>>
>>
>> ------------------------------------------------------------------------------
>> What You Don't Know About Data Connectivity CAN Hurt You
>> This paper provides an overview of data connectivity, details
>> its effect on application quality, and explores various alternative
>> solutions. http://p.sf.net/sfu/progress-d2d
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