Unable to schedule python script using crontab

Question

I am trying to schedule a python script using crontab to run every three minutes. It's not executing as per schedule set.

When I try to execute the script from the centos terminal it's working properly. How to fix this.

Location of my script

/opt/app-root/src/S3_Upload_V1.py

Location of crontab /usr/bin/crontab

My scheduling code

*/3 * * * * /opt/app-root/src/S3_Upload_V1.py

The script executes independently from the terminal but not from the crontab schedule. How to fix this?

More generally, you are expected to perform basic troubleshooting before posting. The nominated dupicate and [the Stack Overflow `crontab` tag info page](/tags/crontab/info) show how. If this is one of the common cases, please accept the duplicate nomination. — tripleee, Apr 07 '19 at 05:52
,.. And if not, please [edit] your question to include useful diagnotics, i.e. that you have checked the regular logs and your email inbox; you get an error message somewhere, we need to see it. — tripleee, Apr 07 '19 at 05:57
@ashokeapen I SEE that you took my advice to use `cron` as cited in my answer to your previous question on using `schedule` to execute a script -- every workday (monday to friday) at 8 PM CET. — Life is complex, Apr 07 '19 at 12:39

score 0 · Answer 1 · answered Apr 07 '19 at 05:51

0

A possible cause can be the permissions. You should make sure the file has execution permission. You can do this by running the following:

chmod u+x /opt/app-root/src/S3_Upload.py

You Should also make sure there is a "shebang" (#!) in the beginning of your script:

#!/usr/bin/env python3

answered Apr 07 '19 at 05:51

Bubble Hacker

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I added the '#!' in the begining of the script still is not executing. Also I appened the question showing the permission rights – aeapen Apr 07 '19 at 06:07
Try executing it using the full path and see if there is any issues: ```./opt/app-root/src/S3_Upload.py``` – Bubble Hacker Apr 07 '19 at 06:08
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By the way, the screenshot you just included shows a script with a different file name then the code you provided... – Bubble Hacker Apr 07 '19 at 06:09
i just modified the script to append '#!' – aeapen Apr 07 '19 at 06:12
Bubble Hacker, still doesnt work – aeapen Apr 07 '19 at 06:12
Can you check if the script you are actually trying to run is named ```S3_Upload.py``` or ```S3_Upload_V1.py```? – Bubble Hacker Apr 07 '19 at 06:15
Its S3_Upload_V1. I have checked and included all the changes you have said. still not running – aeapen Apr 07 '19 at 06:18
So now the cron tab looks like this: ```*/3 * * * * /opt/app-root/src/S3_Upload_V1.py```? – Bubble Hacker Apr 07 '19 at 06:39
Yes .you are correct – aeapen Apr 07 '19 at 06:45
And can you tell me which version of Python you are using on your OS? – Bubble Hacker Apr 07 '19 at 06:46
Its Python 3.6.3 – aeapen Apr 07 '19 at 06:54
Can you also locate where Python is installed? I am asking this because Python may be installed in a different location than the default which means you will need to change the path in the ```#!``` – Bubble Hacker Apr 07 '19 at 06:59
Python is installed in /opt/app-root/bin/python. I have added this location inside the script #!/opt/app-root/bin/python3 – aeapen Apr 07 '19 at 07:05

Unable to schedule python script using crontab

1 Answers1