My cron doesn't seem to execute every 5 mins. Can anyone show me where I have gone wrong?
I made it executable using this command:
chmod +x /etc/utilities/poll.py
I can run it manually with this command:
cd /etc/utilities
python poll.py
When I run it like this I get an error:
root#li453-78:~# /etc/utilities/poll.py
-bash: /etc/utilities/poll.py: Permission denied
This is the command I use to add it to shell (via my automatic deployment script):
crontab -l | { cat; echo "*/5 * * * * /etc/utilities/poll.py"; } | crontab -
The start of my python file is like this:
#!/usr/bin/env python
So, could someone please enlighten me about how I should be adding the cron to my debian server via shell so that it executes?
Using the help from here, for whatever reason, even though I had the code correct to make the script executable, this line didn't seem to fire in my deployment script, meaning that all I had to do was run it afterwards to make it executable and then everything worked.
Lesson learnt: If you need to do this, the code above works
Related
I have a python script that works fine when executed from command line. But when I try to run it from cron, it does not work.
command = "rsync -avHP --delete --bwlimit=800 rsync://mirror.nsc.liu.se/CentOS/7.8.2003/ /home/me/reposync/centos"
proc=subprocess.run(command.split(), capture_output=True)
The cronjob runs. The cronfile looks something like this:
PATH=/home/me
40 13 * * * me cd $PATH && ./reposync.py sync 2> /tmp/test.txt
But I get this error (yes, twice) from print(proc.stderr.decode('utf-8')):
-avHP: rsync: command not found
It seems like the problem has to do with not finding rsync but I don't know what to do about it.
The output from /tmp/test.txt:
FileNotFoundError: [Errno 2] No such file or directory: 'rsync'
I have tried adding shell=True to the subprocess.run but it does not seem to make a difference. Or well it does not throw that exception, but I still get the same error when printing stderr from proc.
I suppose that I could solve it by including the absolute path to rsync but it feels like it's a bad idea. But I could be wrong about that. If that is the right approach, please explain why.
In your crontab, you are overwriting your $PATH variable, which now contains only the directory /home/me. Your rsync executable now cannot be found, since it is not in your home directory.
Change your crontab entry by removing the PATH=... line and calling your script with it's full path:
40 13 * * * me /home/me/reposync.py sync 2> /tmp/test.txt
You might have to define shell in your crontab.
The question has been asked previously.
crontab: python script being run but does not execute OS Commands
I am creating a cron job to execute a python script
hello.py
a = 'a cron job was executed here'
text_file = open('output_hello.txt', 'w')
text_file.write(a)
text_file.close()
Works fine if I execute via terminal, I am on ubuntu 15.10.
My cron job file is:
* * * * * /usr/bin/python /home/rohit/hello.py
(excluding the #)
I am a root user and creating the job in /var/spool/cron
The issue is that it is not executing the script. I don't know why.
One does not simply modify the crontab, you run the command:
crontab -e
and edit from there. Execute the above command using sudo if you want it to run as root.
Assuming your paths are correct, your script may not have the right environment or it may not be executable. Ensure your script starts with:
#!/usr/bin/python
And also that you then give execute permission to that script:
chmod a+x hello.py
Ensure you use crontab -e and if you have any doubts about your syntax, you can find more info here:
https://help.ubuntu.com/community/CronHowto
I am trying to run a python file that takes in one argument (CSV file). It works when i run the script in the terminal but it gives errors when i run it in cron.
This is the line that i run in the terminal:
python nb2.py my_csv_file.csv
And here is my code that i am trying to run in cron:
42 13 * * * /usr/local/bin/python2.7 ~/nb/Development/code/nb2.py ~/nb/Development/code/my_csv_file.csv &> /tmp/June_QB_cat.log
The error says that it cannot find a sqlite table file which is already in the code folder.
Note that when you run the command in the terminal, you're in the ~/nb/Development/code directory already and so your current working directory is that; when you run in it cron, it is not. I would suggest either doing (in your cron job) cd ~/nb/Development/code && python nb2.py my_csv_file.csv &> /tmp/logfile.txt or doing an os.chdir("~/nb/Development/code") as the first step in your code. (Also, I'd suggest doing /home/username instead of ~ just in case you aren't running cronjob as your username at some point, but given the error you get, that sounds like it's not an issue)
You can get the path of a file relative to the current script with
import os.path
relative_path = os.path.join( os.path.dirname(__file__), "sqlitetable" )
I tried using cron to start python script , at boot (as mentioned in the link).Running a python script At Boot using cron
I made a python script "hello.py":
#!usr/bin/env python
import time
print "Hello World!"
time.sleep(10)
Then chmod +x hello.py.
I checked,if it running or not,it is giving me output.
I used crontab -e command and added the line #reboot python /home/pi/hello.py &.
Reboot using sudo reboot , but nothing happened! I am newbie .Although I read many discussions but I am not able to fix that!
Generally when I want to verify whether a cronjob ran or not, I redirect all output to a log file like so:
12 0 * * * python /Path/To/File.py > /Path/ToLog/log 2>&1
Then you can check this log timestamp and for its contents
Python crontab script doesnt seem to work. When i run it manually,
python /home/ec2-user/code1.py
it works fine but when put into cron.txt file for the crontab, doesnt.
My crontab file is:
#hourly python /home/ec2-user/code1.py >/dev/null 2>&1
i also tried
0 * * * * python /home/ec2-user/code1.py >/dev/null 2>&1
But neither have much luck.
sudo crontab -l
#hourly python /home/ec2-user/code1.py >/dev/null 2>&1
Shows everything functional.
I tried Crontab not running my python script and couple others with not much luck either.
EDIT:
With
PATH=/opt/python2.7/bin
MAILTO=my#email
*/5 * * * * /home/ec2-user/code1.py
Email i get is:
/bin/sh: /home/ec2-user/code1.py : No such file or directory
Yet I can open and edit the file no problem. I tried many different thing but it comes down to this: cron doesnt see the file.
Feels like I went through entire https://askubuntu.com/questions/23009/reasons-why-crontab-does-not-work
and still no luck
Verify cron is running: ps aux | grep [c]ron should show a running cron process
Remove the redirects from the command so that cron emails you the output
Add a MAILTO=<email address> to your crontab, so that you get the email
Put the full path to python (/opt/python2.7/bin/python) instead of just python in the command
Add another command to crontab such as echo FOOBAR and verify that you get the email.
ls -l /homeec2-user/code1.py ? Should that be /home/ec2-user/code1.py
Only ever edit a user's crontab with crontab -e never from another platform, or by editing the file directly.
Run crontab -l | cat -A so that we can verify all the control characters are correct.
did you check the following points?
is your script executable? chmod 700 code1.py
the first line in your code should be, in most cases the python is installed at this place
#!/usr/bin/python
after that the crontab as follow should execute
0 * * * * /home/ec2-user/code1.py >/dev/null 2>&1
If the error message is correctly copy/pasted, it seems to reveal that there is a problem with the crontab file. If you created it on a foreign platform, it might be best to start over with an empty file, this time creating it in a native editor.
As others have already pointed out, redirecting output and errors to /dev/null basically makes debugging impossible, so don't do that. If your program creates copiously verbose uninformative output, run it in a wrapper which filters out the trivial diagnostics, or, if it is your own program, rewrite it to run silently in normal operation.
Did you try "/usr/bin/python" instead of "python"?
ps ax | grep python
will give you the path you could use.
try this command that should hopefully where your python is :
which python
very likely you will have something like
/usr/bin/python /home/ec2-user/code1.py