[Planetlab-users] Issue while using vxargs to install library files onto a planetlab node (my sliver)

[Benoy Varghese]

Great.. It worked... Thank you Robert.
Just a minor tweak required, you dont have to use the pseudo tty option with ssh (ssh -t) when using "script -c".
Great solution. Thanks.

-Benoy

On Jan 31, 2012, at 11:24 PM, Robert Escriva wrote:

> On Mon, Jan 30, 2012 at 11:26:48PM -0500, Benoy Varghese wrote:
>> Hi,
>>
>> To provide a background on my issue, I need to install and run my
>> application of multiple planetlab nodes parallely. Henec i am using
>> vxargs to issue commands to install and run this application. The
>> problem i am facing is when i try to install the library files
>> required for my application which require root privileges, vxargs
>> seems to get stuck.
>>
>> For example, If i need to install a package openssl-devel, i need to
>> run the following vxargs command:
>>
>> vxargs.py -t 10 -a iplist.txt -o
>> /Users/planetlab_launchpad/tmp/result ssh nicta_streaming_bt@{} 'sudo
>> yum -y install openssl-devel'
>> I get the following error in the output file:
>> sudo: no tty present and no askpass program specified
>>
>> To resolve this issue i used 'ssh -t' as shown below:
>>
>> vxargs.py -t 10 -a iplist.txt -o
>> /Users/planetlab_launchpad/tmp/result ssh -t nicta_streaming_bt@{}
>> 'sudo yum -y install openssl-devel'
>>
>> But running it using vxargs as shown below is causing the tty
>> terminal screen to be stuck for a very long time. (even If i use a
>> timeout (-t 10 ), the terminal screen exits after timeout, but the
>> command is never executed).
>>
>> I have tried running the install command as a script in the node and
>> then execute it remotely using vxargs, but still the results are
>> same. The library is not getting installed.
>>
>> Seems to me like it is a problem with using pseudo tty option in
>> vxargs.
>>
>> Any suggestions on how to resolve this issue is appreciated. Thank
>> you.
>>
>> Ben
>
> enclose the sudo with "script", e.g.:
>
>    vxargs.py -t 10 -a iplist.txt \
>        -o /Users/planetlab_launchpad/tmp/result \
>        ssh -t nicta_streaming_bt@{} \
>        "script -c 'sudo yum -y install openssl-devel'"
>
> This will allow you to see the output of sudo, and should run the
> command.
>
> -Robert
>
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