Docker | Problem with installing lxml on Python 3.8 [duplicate] - docker

Question

I want to deploy my python project in docker, I wrote lxml>=3.5.0 in the requirments.txt as the project needs lxml. Here is my dockfile:
FROM gliderlabs/alpine:3.3
RUN set -x \
&& buildDeps='\
python-dev \
py-pip \
build-base \
' \
&& apk --update add python py-lxml $buildDeps \
&& rm -rf /var/cache/apk/* \
&& mkdir -p /app
ENV INSTALL_PATH /app
WORKDIR $INSTALL_PATH
COPY requirements-docker.txt ./
RUN pip install -r requirements.txt
COPY . .
RUN apk del --purge $buildDeps
ENTRYPOINT ["celery", "-A", "tasks", "worker", "-l", "info", "-B"]
I got this when I deploy it to docker:
*********************************************************************************
Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?
*********************************************************************************
error: command 'gcc' failed with exit status 1
----------------------------------------
Rolling back uninstall of lxml
I though it was because 'python-dev' and 'python-lxml', then I edited the dockfile like this:
WORKDIR $INSTALL_PATH
COPY requirements-docker.txt ./
RUN apt-get build-dev python-lxml
RUN pip install -r requirements.txt
It did not work, and I got another error:
---> Running in 73201a0dcd59
/bin/sh: apt-get: not found
How can I install lxml correctly in docker?

Answer 1

I added RUN apk add --update --no-cache g++ gcc libxslt-dev before RUN pip install -r requirements.txt and it worked.

Answer 2

Accepted answer is not neat and installs redundant packages. Better solution for reducing image size will be:
RUN apk add --no-cache --virtual .build-deps gcc libc-dev libxslt-dev && \
apk add --no-cache libxslt && \
pip install --no-cache-dir lxml>=3.5.0 && \
apk del .build-deps
Result image size will be < 163MB

Answer 3

Since I was using a much more bare-bone image I needed some more libs/apps.
This worked for me:
RUN apk add --update --no-cache g++ gcc libxml2-dev libxslt-dev python-dev libffi-dev openssl-dev make
RUN pip install -r requirements.txt

Answer 4

Since only this answer worked for me and I wanted something light
And I liked this answer, but which didn't work for me at first
I've edited it for myself and got this at the end :
RUN apk add --update --no-cache --virtual .build-deps g++ gcc libxml2-dev libxslt-dev python-dev && \
apk add --no-cache libxslt && \
pip install --no-cache-dir lxml>=3.5.0 && \
apk del .build-deps
The final image is around 110MB, and didn't have anymore any libxml and libslt errors

Answer 5

Do as in
https://hub.docker.com/r/ryanfox1985/docker-couchpotato/builds/boinrrs9dbhnutwjxjw2l8m/
Download the apk and install it
RUN wget http://nl.alpinelinux.org/alpine/edge/main/x86_64/py-lxml-3.4.0-r0.apk -O /var/cache/apk/py-lxml.apk
RUN apk add --allow-untrusted /var/cache/apk/py-lxml.apk

Answer 6

Actually, it's just
RUN apt-get install -y libxslt1-dev