hi, When I use: os.popen('ssh -l root@something tomcat4 stop') I find the command always hangs. The 'something' host contains the correct key in the authorized_hosts file and works ok on the command prompt. I've tried os.system() but this also hangs. I notice that the 'tomcat4 stop' is being executed but when I do a 'ps -ef' I notice the popen process is still alive. I've also noticed this command sometimes works (ie it doesnt hang) but I've no idea why. Has anyone experienced similar problems with this? Or does anyone have any alternative suggestions? I'm really at my wits end with this one! thanks alot, Rob
When I run the python script I run it as a background process, this seems to cause any popen() calls to hang indefinately (where each call remotely executes a command via ssh). I'm not sure why this is the case though so I was hoping someone could help explain!
-----Original Message----- From: Byrom, R (Rob) [mailto:R.By...@rl.ac.uk] Sent: Wednesday, November 26, 2003 1:15 PM To: 'python-l...@python.org' Subject: problems with popen (linux7.3 python2.2.2)
hi, When I use: os.popen('ssh -l root@something tomcat4 stop') I find the command always hangs. The 'something' host contains the correct key in the authorized_hosts file and works ok on the command prompt. I've tried os.system() but this also hangs. I notice that the 'tomcat4 stop' is being executed but when I do a 'ps -ef' I notice the popen process is still alive. I've also noticed this command sometimes works (ie it doesnt hang) but I've no idea why. Has anyone experienced similar problems with this? Or does anyone have any alternative suggestions? I'm really at my wits end with this one! thanks alot, Rob
>When I use: >os.popen('ssh -l root@something tomcat4 stop') >I find the command always hangs.
Try adding a "-t" to your SSH command-line; it forces it to request a TTY instead of being silent. SSH tries to do "the right thing" when not launched from a terminal prompt.
thanks! I'll give this a try. I did managed to avoid the 'hang' by putting the python script in the foreground (previously I was running the script as a back ground process).
-----Original Message----- From: Michael T. Babcock [mailto:mbabc...@fibrespeed.net] Sent: Wednesday, November 26, 2003 3:50 PM To: python-l...@python.org Subject: Re: problems with popen (linux7.3 python2.2.2)
>When I use: >os.popen('ssh -l root@something tomcat4 stop') >I find the command always hangs.
Try adding a "-t" to your SSH command-line; it forces it to request a TTY instead of being silent. SSH tries to do "the right thing" when not launched from a terminal prompt.
