Raspberry Pi, and linux systemd, and .system files - python-3.x

I'm trying to to run a script when my raspberry pi reboots, but its giving me this error. the script works when I run it in terminal, but it doesn't run when I use systemd
● Refridgerator.service - The refridgerator thing
Loaded: loaded (/etc/systemd/system/Refridgerator.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Tue 2021-01-19 17:20:34 EST; 11min ago
Process: 777 ExecStart=/usr/bin/python3 /home/pi/Refridgerator.py (code=exited, status=1/FAILURE)
Main PID: 777 (code=exited, status=1/FAILURE)
Jan 19 17:20:33 raspberrypi systemd[1]: Started The refridgerator thing.
Jan 19 17:20:33 raspberrypi python3[777]: Traceback (most recent call last):
Jan 19 17:20:33 raspberrypi python3[777]: File "/home/pi/Refridgerator.py", line 3, in <module>
Jan 19 17:20:33 raspberrypi python3[777]: from pydub import AudioSegment
Jan 19 17:20:33 raspberrypi python3[777]: ModuleNotFoundError: No module named 'pydub'
Jan 19 17:20:34 raspberrypi systemd[1]: Refridgerator.service: Main process exited, code=exited, status=1/FAILURE
Jan 19 17:20:34 raspberrypi systemd[1]: Refridgerator.service: Failed with result 'exit-code'.
[Unit]
Description=The refridgerator thing
After=multi-user.target
[Service]
Type=simple
ExecStart=/usr/bin/python3 /home/pi/Refridgerator.py
Restart=on-abort
[Install]
WantedBy=multi-user.target

I solved it by reinstalling pydub with sudo pip instead of just pip
sudo pip3 install pydub
or
sudo pip install pydub

Related

Control python script like linux cli applicaitons

I have a python script which I want to control using linux commands.
e.g. like we control mysql: service mysql restart
How to achieve this kind of functionality.
I saw some bash scripts doing this but don't have any knowledge in bash scripting.
Thanks.
UPDATE:
I have a site_monitor.py script which I included in site_monitor.service in /etc/systemd/system/.
[Unit]
Description=Site Monitor Service
After=multi-user.target
[Service]
Type=simple
Restart=always
ExecStart=/usr/bin/python3 /home/hemantsah/WisdomLeaf/site_monitor/site_monitor.py
[Install]
WantedBy=multi-user.target
After doing systemctl daemon-reload.service, I started the script using systemctl start site_monitor.service
Listing all the services using systemctl list-units --type=service, I can see the service running, but it's not doing anything.
If I run my python script in terminal using python3 site_monitor.py, then it works.
I found just now if I start the service and check the status using sudo service site_monitor status,
I checked after starting the service, it was fine , checking after sometime again gave me this error:
hemantsah#pop-os:/etc/systemd/system$ sudo service site_monitor status
● site_monitor.service - Site Monitor Service
Loaded: loaded (/etc/systemd/system/site_monitor.service; disabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2021-11-18 10:47:30 IST; 16s ago
Process: 111989 ExecStart=/usr/bin/python3 /home/hemantsah/WisdomLeaf/site_monitor/site_monitor.py (code=exited, status=1/FAILURE)
Main PID: 111989 (code=exited, status=1/FAILURE)
Nov 18 10:47:30 pop-os systemd[1]: site_monitor.service: Scheduled restart job, restart counter is at 5.
Nov 18 10:47:30 pop-os systemd[1]: Stopped Site Monitor Service.
Nov 18 10:47:30 pop-os systemd[1]: site_monitor.service: Start request repeated too quickly.
Nov 18 10:47:30 pop-os systemd[1]: site_monitor.service: Failed with result 'exit-code'.
Nov 18 10:47:30 pop-os systemd[1]: Failed to start Site Monitor Service.
Nov 18 10:47:34 pop-os systemd[1]: site_monitor.service: Start request repeated too quickly.
Nov 18 10:47:34 pop-os systemd[1]: site_monitor.service: Failed with result 'exit-code'.
Nov 18 10:47:34 pop-os systemd[1]: Failed to start Site Monitor Service.
Running sudo journalctl -u site_monitor.service gave me following error:
Nov 18 10:10:37 pop-os systemd[1]: site_monitor.service: Scheduled restart job, restart counter is at 4.
Nov 18 10:10:37 pop-os systemd[1]: Stopped Site Monitor Service.
Nov 18 10:10:37 pop-os systemd[1]: Started Site Monitor Service.
Nov 18 10:10:37 pop-os python3[111023]: Traceback (most recent call last):
Nov 18 10:10:37 pop-os python3[111023]: File "/home/hemantsah/WisdomLeaf/site_monitor/site_monitor.py", line 3, in <module>
Nov 18 10:10:37 pop-os python3[111023]: from bs4 import BeautifulSoup
Nov 18 10:10:37 pop-os python3[111023]: ModuleNotFoundError: No module named 'bs4'
Nov 18 10:10:37 pop-os systemd[1]: site_monitor.service: Main process exited, code=exited, status=1/FAILURE
Nov 18 10:10:37 pop-os systemd[1]: site_monitor.service: Failed with result 'exit-code'.
I guess you already have systemd in your machine, but in case you don't, you can install it via package manager, e.g. apt:
sudo apt-get install systemd
You can then, create your own systemd service. To do so, just create a new file in /etc/systemd/systemd/, something like /etc/systemd/systemd/your_service_name.service. That file should look like this:
[Unit]
Description= My service
After=multi-user.target
[Service]
Type=simple
WorkingDirectory=/path/to/your/working/dir/
User=<user>
Restart=always
ExecStart=/usr/bin/python3 /path/to/your/script/<script_name>.py
[Install]
WantedBy=multi-user.target
Of course you can use different python 3 binaries instead of /usr/bin/python3. Also, the service configuration itself can be different, the example above is just a basic service structure.
After creating this file (with root permissions), you should reload the daemon with:
sudo systemctl daemon-reload
And if you want to keep your script enabled even if the server/machine restarts, run:
sudo systemctl enable your_service_name.service
Finally, you can start your service using the following:
sudo systemctl start your_service_name.service

Bash script doesn't launch with systemd

I'm trying to launch a simple bash script called script-startup.sh when my raspberry Pi boots, using systemd. This script only contains some basic actions on files (copying, moving, executing binaries) and calls make as well to compile bits of codes.
I created a new file with path /etc/systemd/system/baymabx.service :
[Unit]
Description=Baymabx
After=pm2-pi
[Service]
ExecStart=/home/pi/Desktop/baymabx/script-startup.sh
Launching /home/pi/Desktop/baymabx/script-startup.sh in the terminal works as it is intended to be. Also, pm2-pi.service is pm2 starting my backend server, that I need before using my script.
However, after doing systemctl start baymabx and systemctl status baymabx, I get :
● baymabx.service - Baymabx
Loaded: loaded (/etc/systemd/system/baymabx.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Fri 2020-12-11 01:34:06 CET; 3min 2s ago
Process: 359 ExecStart=/home/pi/Desktop/baymabx/script-startup.sh (code=exited, status=203/EXEC)
Main PID: 359 (code=exited, status=203/EXEC)
Dec 11 01:34:06 raspberrypi systemd[1]: Started Baymabx.
Dec 11 01:34:06 raspberrypi systemd[359]: baymabx.service: Failed to execute command: Exec format error
Dec 11 01:34:06 raspberrypi systemd[359]: baymabx.service: Failed at step EXEC spawning /home/pi/Desktop/baymabx/script-startup.sh: Exec format error
Dec 11 01:34:06 raspberrypi systemd[1]: baymabx.service: Main process exited, code=exited, status=203/EXEC
Dec 11 01:34:06 raspberrypi systemd[1]: baymabx.service: Failed with result 'exit-code'.
Anyone know how I can get it to work ?

Issues using Systemd to start a python script (code=exited, status=2/INVALIDARGUMENT)

I'm currently trying to have a program startup when the Raspberry Pi 3 I'm using boots. The program controls a drone and will need a network connection before starting. When I try to use Systemd to start this program, I get this error message;
droneStartup.service - The Drone Startup service.
Loaded: loaded (/etc/systemd/system/droneStartup.service; disabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Mon 2019-04-15 14:06:24 EDT; 1s ago
Process: 1895 ExecStart=/bin/bash /home/pi/Systemd_test.py (code=exited, status=2)
Main PID: 1895 (code=exited, status=2)
Apr 15 14:06:24 pi systemd[1]: Started The Drone Startup service..
Apr 15 14:06:24 pi bash[1895]: from: can't read /var/mail/time
Apr 15 14:06:24 pi bash[1895]: /home/pi/Systemd_test.py: line 4: syntax error near unexpected token `'Looping...''
Apr 15 14:06:24 pi bash[1895]: /home/pi/Systemd_test.py: line 4: ` print('Looping...')'
Apr 15 14:06:24 pi systemd[1]: droneStartup.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Apr 15 14:06:24 pi systemd[1]: droneStartup.service: Unit entered failed state.
Apr 15 14:06:24 pi systemd[1]: droneStartup.service: Failed with result 'exit-code'.
This is the placeholder program I'm using to test the startup;
from time import sleep
while True :
print('Looping...')
sleep(1)
And this is the .service file I'm using;
[Unit]
Description=The Drone Startup service.
Wants=network-online.target
After=network-online.target
[Service]
ExecStart=/bin/bash /home/pi/Systemd_test.py
[Install]
WantedBy=multi-user.target
I don't know why it's coming up with a syntax error, and would greatly appreciate any help with this issue.
You are attempting to run a py file with bash exec.
Needs to read:
ExecStart=/usr/bin/python /home/pi/Systemd_test.py
Assuming your Python library lives at /usr/bin/python

systemd server isn't started

I am running this systemd command but when I screen -ls I don't see the screen.
The status is active and seems well.
But it isn't actually running when I check.
This is the .service file
[Unit]
Description=webhookdaemon
[Service]
ExecStart=/bin/bash path/to/script
RemainAfterExit=yes
Type=forking
Restart=on-failure
RestartSec=30
[Install]
WantedBy=multi-user.target
Here is the script (path/to/script)
screen -S docker-hub-daemon -d -m npm run start --prefix /root/nodeserver/
Here is the status output
webookdaemon.service - webhookdaemon
Loaded: loaded (/etc/systemd/system/webookdaemon.service; enabled; vendor preset: enabled)
Active: active (exited) since Tue 2018-03-13 19:55:15 UTC; 57min ago
Main PID: 2144 (code=exited, status=0/SUCCESS)
CGroup: /system.slice/webookdaemon.service
Mar 13 19:58:29 aggregate-terminal-logs-tor1-01 systemd[1]: Started webhookdaemon.
Mar 13 19:59:03 aggregate-terminal-logs-tor1-01 systemd[1]: Started webhookdaemon.
Mar 13 20:00:22 aggregate-terminal-logs-tor1-01 systemd[1]: Started webhookdaemon.
Mar 13 20:01:21 aggregate-terminal-logs-tor1-01 systemd[1]: Started webhookdaemon.
Mar 13 20:02:26 aggregate-terminal-logs-tor1-01 systemd[1]: Started webhookdaemon.
Mar 13 20:04:41 aggregate-terminal-logs-tor1-01 systemd[1]: Started webhookdaemon.
Mar 13 20:47:41 aggregate-terminal-logs-tor1-01 systemd[1]: Started webhookdaemon.
Mar 13 20:49:53 aggregate-terminal-logs-tor1-01 systemd[1]: Started webhookdaemon.
Mar 13 20:52:53 aggregate-terminal-logs-tor1-01 systemd[1]: Started webhookdaemon.
root#aggregate-terminal-logs-tor1-01:~#
You should not be using screen to manage services. Just use systemd directly.
Make sure that Type= is set match the behavior of the service you are lauching. I could not find references to docker-hub-daemon, so I'm not sure the appropriate value for it. See man systemd.service for the documentation for Type=.
Instead of using screen -ls to check the status of the service, use systemctl status webookdaemon.
You may also wish to update the spelling of this service to be webhoookdaemon to match the spelling in the description.

systemd cannot run service after running commands

I tried to run systemd using the commands systemctl enable photogrid.service & systemctl start photogrid.service in ubuntu 16
The nodejs app itself can run as expected. The service is to ensure that application will auto-start when application crash or server reboot.
The service apparently did not start. So I key in systemctl status photogrid.service to see what happened, the below is what I got from the terminal.
● photogrid.service - Photogrid
Loaded: loaded (/lib/systemd/system/photogrid.service; enabled; vendor preset: enabled)
Active: activating (auto-restart) (Result: exit-code) since Wed 2016-11-09 04:35:36 UTC; 7s ago
Process: 27523 ExecStart=/usr/local/bin/node /home/ubuntu/photogrid/app.js (code=exited, status=203/EXEC)
Main PID: 27523 (code=exited, status=203/EXEC)
Nov 09 04:35:36 ip-172-31-34-151 systemd[1]: photogrid.service: Main process exited, code=exited, status=203/EXEC
Nov 09 04:35:36 ip-172-31-34-151 systemd[1]: photogrid.service: Unit entered failed state.
Nov 09 04:35:36 ip-172-31-34-151 systemd[1]: photogrid.service: Failed with result 'exit-code'.
This the script that I wrote for the service under the path /lib/systemd/system/photogrid.service
[Unit]
Description=Photogrid
[Service]
Type=simple
Restart=always
RestartSec=10
Environment=NODE_ENV=production
ExecStart=/usr/local/bin/node /home/ubuntu/photogrid/app.js
[Install]
WantedBy=multi-user.target
Basically under ExecStart make sure you point to the correct nodejs executable. For my case it was in a different folder and not /usr/local/bin/node, to check where is your node executable. (Assuming you confirm you have downloaded and install it correctly in linux) use command which node to give you path direction.

Resources