Python shell log command not showing up in docker/kubernetes pod

Question

I ran the following code in the python shell but it is not showing up the docker/kubernetes pod logs:

import logging
logging.basicConfig(level=logging.INFO)
logging.info("Test")

This is a simplified version of what I am trying to do which is essentially run one-off scripts/commands in the python shell and have logs to show up. How do I go about getting this to work? Is it because the shell I opened up is not attached to the process that creates the logs?

I'm currently using Docker and Kubernetes.

Thanks!

You ran this in a shell? If so then it wont be in the logs. The PID 1 stdout only is sent to logs — Tarun Lalwani
– Tarun Lalwani, Commented Jul 1, 2018 at 9:29
What @TarunLalwani said is 100% true, but you can also cheat and tee the output into /proc/1/fd/1 to have stdout of your process go to the stdout of the container's process (you may have to substitute /proc/1 for the PID of your container's main process, but it's usually 1); it may be possible to do some dup2 trickery to get both stdout and stderr to go to /proc/1's fds, but that would require more than 161 more characters :-) — mdaniel
– mdaniel, Commented Jul 1, 2018 at 22:30

Nick Rak · Accepted Answer · 2018-07-02 13:34:58Z

1

As Matthew L Daniel wrote, you can cheat by using additional tools as a workaround to send your logs to stdout.

Also, you can import library sys and stream logs to stdout by this lib. There is an example of code:

import logging  
import sys  

root = logging.getLogger()  
root.setLevel(logging.DEBUG)  

ch = logging.StreamHandler(sys.stdout)  
ch.setLevel(logging.DEBUG)  
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')  
ch.setFormatter(formatter)  
root.addHandler(ch)

I found it on Stack, so I’ve attached link as a source.

answered Jul 2, 2018 at 13:34

Nick Rak

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