Docker - Dockerfile.md

Dockerfile

Useful or interesting snippets

FROM debian:jessie
ENV DEBIAN_FRONTEND noninteractive
RUN apt-get update && \
    apt-get install -y --no-install-recommends \
        build-essential \
        ca-certificates \
        python3 \
        python3-dev \
        vim \
        ...

Cleanup for smaller images:

RUN apt-get ... && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

For more inspiration, see official Dockerfiles at github.com/docker-library.

Private NPM repository

If you use private NPM repository (for example Sinopia) and want to run npm install as part of docker build:

First, prepare npmrc file:

egrep '^//npm.example.com/:_authToken=' ~/.npmrc > npmrc
echo 'registry=https://npm.example.com' >> npmrc

Dockerfile snippet:

COPY npmrc /root/.npmrc
WORKDIR my-web-app
RUN npm install --unsafe-perm

Signals

Proper handling of signals because of init etc. so Ctr-C and docker stop works - download this signal_wrapper.py and run commands this way:

ADD signal_wrapper.py /
CMD ["/signal_wrapper.py", "gulp", "-p"]

This is my "invention" - I couldn't find anything like this (just some hints that this is the way). But it is possible that there is more correct way how to deal with signals.