check whether a process is still running on remote hosts

[tina_zy_qian at yahoo.com]

On Tuesday, October 16, 2018 at 2:22:29 PM UTC-7, Larry.... at gmail.com wrote:
> On Tue, Oct 16, 2018 at 5:15 PM tina_zy_qian--- via Python-list
> <python-list at python.org> wrote:
> >
> > I newly learned Python, and I need to wrap up a script to do following.
> >
> > Env:
> > 1: One launcher Linux VM (from where to run the Python script)
> > 2. 100+ Linux VM
> >
> > requirement:
> > In general, run a remote_script on remote 100 VMs and get the log files generated to remote hosts back to launcher.
> >
> > steps
> > 1. cp (pexpect.spawn('scp  ')) supporting files including the remote_script to remotehost:/remote_folder
> > 2. run remote_script on remote host  ( pexpect.spawn('ssh %s@%s "%s"' % (user,host,cmd))
> > 3. wait and check until the remote_script was run on remote host. (to check "ps -ef" result on remote hosts)
> > 4. collect data from remote hosts -- reverse to step 1.
> >
> >
> > I briefly implemented other steps expect step 3. Two options are below.
> >
> > option 1: run another script "ps -ef|grep remote_script and output result to a local file, then collected the files to launcher.
> >
> > option 2: run pexect.spawn('ssh' ....'ps -e') to get the result directly to laucher console.
> > But how I can get only the output for "ps -ef" command only?
> >
> > I must use the (users, passwords, and hosts) way to do ssh and scp because I may not be allowed to use ssh key on some hosts. Any suggestions or sample code for step 3 or the whole script are appreciated. Thanks.
> 
> This looks amazingly similar to a pre interview programming assignment
> was given once.

Nice to know that. This is my daily work related though. Not interview question from me or to me.