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

[Benoy Varghese]

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


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