supervisor note

in Docker

supervisor @ docker means a single container/multi process. So if you want to use python3 on the main process, you think that want to run supervisor via python3 too. Unfortunately, supervisor only supports python2..

via python:3.7-slim & deb's supervisor

use python:3.7-slim docker image and apt install supervisor.

• When you type supervisor system use /usr/bin/python (= python 2.7)
• when you type python, it means /usr/local/bin/python run as root (= python 3.7)

You must set /usr/local/bin in $PATH higher priority than /usr/bin.

via multi-stage build (failed)

Create virtualenv via python:2.7 container & copy venv artifacts to python:3.7 container by docker's. But venv don't contain system shared library (such as libpython.so) although make virtualenv with --always-copy options.

Solutions

• Omunibus. (But i will not consume my time for chef)
• pyenv. (So fat!)