How to run the Python program in the background in Ubuntu server

Question

I have a python script. Script have selenium with Chrome and go to a website, take data and put in CSV file.
This is a very long work.
I put the script on the server. And run. All work. But I need script work in the background.

chmod +x createdb.py
nohup python ./createdb.py &

And I see

(env)$ nohup ./createdb.py &
[1] 32257
(env)$ nohup: ignoring input and appending output to 'nohup.out'

Press Enter.

(env)$ nohup ./createdb.py &
[1] 32257
(env)$ nohup: ignoring input and appending output to 'nohup.out'
[1]+  Exit 1                  nohup ./createdb.py

Then it runs and immediately writes errors to the file, that Chrome did not start or there was no click.
I want to remind you that if you start without nohup, then everything will work.
What am I doing wrong? How to run a script?
Thank you very much.

Urban48 · Accepted Answer · 2018-02-17 15:15:08Z

3

You could create a background daemon (service)
You taged Ubuntu 16.04 it means you got systemd, for more information on how to set it up, please visit this link

create a file called <my_service>.system and put it there: /etc/systemd/system

you systemd unit could look like this:

[Unit]
Description=my service
After=graphical.target

[Service]
Type=simple
WorkingDirectory=/my_dir
ExecStart=python my_script.py

[Install]
WantedBy=multi-user.target

then all you have to do is, reload systemd manage and start your service:

sudo systemctl daemon-reload
sudo systemctl myservice start

edited Feb 17, 2018 at 15:15

answered Feb 16, 2018 at 8:48

Urban48

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2 Comments

Serhii Over a year ago

Thank you for your answer, Urban48. But it seemed to me very difficult. can you show an example of a simple python script that you need to run in a virtual environment? Or maybe you know a book where it is described for beginners?

Urban48 Over a year ago

@asergey, its not hard at all. i outlined exactly what you need to do in my answer, just few easy steps. take the time to read a little about it, or watch a video.

Jonathan DEKHTIAR · Accepted Answer · 2018-02-16 08:43:08Z

2

You can use the screen command, it works perfectly.

Here is a very good link: https://www.rackaid.com/blog/linux-screen-tutorial-and-how-to/

answered Feb 16, 2018 at 8:43

Jonathan DEKHTIAR

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2 Comments

Serhii Over a year ago

Is it like tmux?

Jonathan DEKHTIAR Over a year ago

I think it is better to redirect you to the following stack exchange discussion superuser.com/questions/236158/tmux-vs-screen Please mark your question as answered if you have found what you looked for

ahmed eshra · Accepted Answer · 2018-05-07 14:32:52Z

-1

You can use a simple command, from the env directory:

(env)$ python /path/to/createdb.py > logger.txt 2>&1 &

This will help for storing the program logs in a defined file called "logger.txt"

answered May 7, 2018 at 14:32

ahmed eshra

793 bronze badges

1 Comment

hobs Over a year ago

Without screen or tmux or nohup, your background process will be killed whenever the terminal or shell is closed or you exit the ssh session.

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