monitoring/restarting an application

[Ghirai]

Hello list,

I need to keep x number of instances of an external applications
running, say /bin/x, but also kill and restart each one after y seconds.

What would be the best way to do this (with python 2.5.x)?

I'm thinking of having a list of running pids, then have a thread check
if len(list) < x, and if it is, then start a new process (with
os.spawnv?) and add it to the list.
Also in the list i'd keep PIDs and some sort of started-timestamp, so i
know which to kill.

Does this sound reasonable, or is there an easier way?

Thanks.

 

[Marco Mariani]

I need to keep x number of instances of an external applications
running, say /bin/x, but also kill and restart each one after y seconds.

What would be the best way to do this (with python 2.5.x)?

easy_install supervisor

it should do everything for you

 

[Paul Rubin]

Does this sound reasonable, or is there an easier way?

Use something like daemontools or upstart. Don't roll your own.

 

[Ghirai]

Use something like daemontools or upstart. Don't roll your own.
--

Alright, i'll have a look at those as well as supervisor.
Thanks.

 

[Giampaolo Rodola']

Hello list,

I need to keep x number of instances of an external applications
running, say /bin/x, but also kill and restart each one after y seconds.

What would be the best way to do this (with python 2.5.x)?

I'm thinking of having a list of running pids, then have a thread check
if len(list) < x, and if it is, then start a new process (with
os.spawnv?) and add it to the list.
Also in the list i'd keep PIDs and some sort of started-timestamp, so i
know which to kill.

Does this sound reasonable, or is there an easier way?

Thanks.

Maybe you might want to take a look at psutil [1].
Rather than looking for PID->timestamp you can look for something else
like PID->cmdline or PID->executable_name.
Example:

import psutil
for process in psutil.process_iter():
if (process.pid > 1000) and (process.name ==
'your_executable_name'):
process.kill()
# restart your process here
# ...


[1] http://code.google.com/p/psutil

--- Giampaolo
http://code.google.com/p/pyftpdlib