Consider setting PYTHONUNBUFFERED. about s2i-python-container HOT 8 CLOSED

Note that it would be possible to undo this as the default by a user setting in the .s2i/environment file:

PYTHONUNBUFFERED=

That is, in the Dockerfile use:

ENV PYTHONUNBUFFERED=1

A user can undo it by setting the same environment variable, but to an empty string, thus overriding the default. This works as the Python interpreter code is:

    if (!saw_unbuffered_flag &&
        (p = Py_GETENV("PYTHONUNBUFFERED")) && *p != '\0')
        Py_UnbufferedStdioFlag = 1;

so only enables unbuffered stdio if the environment variable is non empty.

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For https://github.com/ncoghlan/srpminfo I'm seeing the problem where no logging output from the Python workers appears in the OpenShift console window, but setting PYTHONUNBUFFERED=1 in the S2I environment didn't appear to make any difference.

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Try using oc logs on pod. I have sometimes seen web console not showing logging. In your case the problem may be using gunicorn. It screws around with the stdout/stderr and can stuff things up. Maybe the case that default gunicorn options are suppressing it.

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Possibly could be because you are using Flask.

• http://stackoverflow.com/a/30288342/128141

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I checked with ncoghlan/srpminfo@82fa7cc (using explicit print calls to bypass the logging subsystem entirely) and it looks like the S2I image is configured to unconditionally throw away all console output from the WSGI process by default.

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Oops, @GrahamDumpleton pointed out that the code inside the __main__ guard will never be called under gunicorn, so all my testing so far has been entirely invalid. Sorry for the noise :(

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@GrahamDumpleton @sclorg/container-images this issue seems to be resolved already by #169.

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Indeed, PYTHONUNBUFFERED is already being set thanks to #169. Closing the issue.

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