How to build a custom image using 'python:alpine' for use with AWS Lambda? - docker

Question

This page describes creating a Docker image for use with Lambda using 'python:buster'
https://docs.aws.amazon.com/lambda/latest/dg/images-create.html#images-create-from-alt
I would like to do the same with 'python:alpine'
but get problems when trying to install 'libcurl4-openssl-dev'
Has anyone successfully built a 'python:alpine' image for use in lambda?

Answer 1

This package "libcurl4-openssl-dev" belongs to debian/ubuntu family which is not exist in Alpine linux distro but as only libcurl.
Btw you can search Alpine packages from here https://pkgs.alpinelinux.org/packages
If you want to achieve a custom Lambda Python runtime with ALPINE then this Dockerfile might useful.
I did slight modifications to fit into the alpine linux world.
# Define function directory
ARG FUNCTION_DIR="/function"
FROM python:alpine3.12 AS python-alpine
RUN apk add --no-cache \
libstdc++
FROM python-alpine as build-image
# Install aws-lambda-cpp build dependencies
RUN apk add --no-cache \
build-base \
libtool \
autoconf \
automake \
libexecinfo-dev \
make \
cmake \
libcurl
# Include global arg in this stage of the build
ARG FUNCTION_DIR
# Create function directory
RUN mkdir -p ${FUNCTION_DIR}
# Copy function code
COPY app/* ${FUNCTION_DIR}
# Install the runtime interface client
RUN python -m pip install --upgrade pip
RUN python -m pip install \
--target ${FUNCTION_DIR} \
awslambdaric
# Multi-stage build: grab a fresh copy of the base image
FROM python-alpine
# Include global arg in this stage of the build
ARG FUNCTION_DIR
# Set working directory to function root directory
WORKDIR ${FUNCTION_DIR}
# Copy in the build image dependencies
COPY --from=build-image ${FUNCTION_DIR} ${FUNCTION_DIR}
ENTRYPOINT [ "/usr/local/bin/python", "-m", "awslambdaric" ]
CMD [ "app.handler" ]