Docker

Links

• Docker-Alphine (github) — A lightweight debian/ubuntu-like image (5MB)

Install

• Docker - Install on Debian.
• Docker - PostInstall (run as non-root).

Examples:

• https://akashrajpurohit.com/blog/build-your-own-docker-with-linux-namespaces-cgroups-and-chroot-handson-guide/

Tips

Alpine - Install a specific package version

From SuperUser:

# Both are equal
apk add packagename=1.2.3-suffix
apk add 'packagename<1.2.3-suffix'

Install pip3

Installing python3-dev in Alpine we get the error pip3: not found

RUN apk add --no-cache python3 openssl ca-certificates git openssh sshpass
&& apk --update add --virtual build-dependencies python3-dev libffi-dev openssl-dev build-base
&& pip3 install --upgrade pip cffi
# ...
# Error:
# /bin/sh: pip3: not found
# ERROR: Job failed: exit code 127

• The workaround is to add py-pip library.
• Recommended solution [1] is to run apk add cmd:pip3, which will pull whatever package that provides pip3.

Don't use Alpine for Python build

• From https://pythonspeed.com/articles/alpine-docker-python/
• Because Alpine uses musl instead of glibc.