Install libssl-dev for Docker

Question

I'm building an image for Docker and it's giving me error:

ERROR: unsatisfiable constraints:
libssl-dev (missing):
required by: world[libssl-dev]

running RUN apk add libssl-dev doesn't seem to help. What can I do to resolve this ?

Dockerfile-dev:

FROM python:3.6.7-alpine
WORKDIR /usr/src/app
COPY ./requirements.txt /usr/src/app/requirements.txt
RUN apk add libssl-dev
RUN apk add libffi-dev
RUN apk add --update python3 python3-dev py-pip build-base
RUN pip3 install -r requirements.txt
COPY . /usr/src/app
CMD python3 manage.py run -h 0.0.0.0

Solution

Some packages are built against libressl in Alpine 3.6. Try replacing line 6 in your Dockerfile with the following

RUN apk add libressl-dev

Comments

[prithajnath]

Can you post your entire Dockerfile?

[Danila Kiver]

Why did you decide that the name of the package is libssl-dev? It looks like it is a dev package for openssl in Debian-based distros (packages.ubuntu.com/trusty/amd64/libssl-dev/filelist), and in Alpine it is openssl-dev (pkgs.alpinelinux.org/…).

[questionto42standswithUkraine]

libressl-dev does not seem to work for all settings. With an outdated postgreSQL alpine image I get ERROR: Service 'xyz' failed to build: The command '/bin/sh -c apk add libressl-dev' returned a non-zero code: 2.