How to address 'OSError: libc not found' raised on Gunicorn exec of Flask app inside Alpine docker container

In your Dockerfile:

RUN apk add binutils libc-dev

python docker sockets flask gunicorn

This problem seems related to a new version of Gunicorn 20.0.0. Try to use a previous one 19.9.0

python docker sockets flask gunicorn

Yes Gunicorn 20.0.0 requires the package libc-dev.

So this works for me:

RUN apk --no-cache add libc-dev

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