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I have a script that starts a server on a remote VM. All works great until I close the shell where I executed the script. When the shell closes, so does the server. After some looking around I found the following:

  1. & will send the job to the background when executed with the symbol
  2. disown -h will disconnect the job from the shell and allow it to run regardless of the shell.

The command I used is:

./ nasb_wxscat160_catalog-4.1.6 1.0.8 > catalog-log.txt & disown -h

When I closed the shell and checked using ps -ef | grep java to see if the job is still working I did see it in the list. However when I tried to connect to the server it was unresponsive.

On deeper inspection, the log file was filled just until I closed the shell and using the ps -m flag I say the process jobs were not working.

Has any one encountered some thing of this sort?

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migrated from Dec 10 '12 at 9:44

This question came from our site for professional and enthusiast programmers.

See: – Paul R Dec 10 '12 at 7:45
@PaulR thank you. but can you explain the connection between the shell closing and the out to file? – raven Dec 10 '12 at 8:12

For one-off jobs which do not daemonize themselves, I usually run them in a screen session. The disadvantage is that you have to start screen before starting the job. My process is usually something like this:

% screen -D -R   # start a new screen session, with reattachment options
% command_to_run_job
ctrl-A ctrl-D

That will run the job in the foreground, then detach from the screen session. Then you can log out, and later reconnect to it with another "screen -D -R"

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thank you. i am new to all of this so can you explain what is a screen session? – raven Dec 10 '12 at 8:07
screen is a virtual tty software that allows you to detach a terminal. – Natim Dec 10 '12 at 10:11
Natim is right. Screen is a window manager for terminals. It's really useful if you're working on remote terminals. I suggest reading the man page (with the command "man screen"). – velotron Dec 11 '12 at 0:48

The other thing you could do is to use supervisord or circus to run your program and make sure it will restart automatically if it stops.

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