Dockerfile

# ---- Build Stage ----

# The version of Alpine to use for the final image
# This should match the version of Alpine that the builder image uses
ARG ALPINE_VERSION=3.10

FROM elixir:1.9.4-alpine AS builder

# The following are build arguments used to change variable parts of the image.
# The name of your application/release (required)
ARG APP_NAME=sip_gateway
# The version of the application we are building (required)
ARG APP_VSN=0.1.0
# The environment to build with
ARG MIX_ENV=prod
# Set this to true if this release is not a Phoenix app
ARG SKIP_PHOENIX=true
# If you are using an umbrella project, you can change this
# argument to the directory the Phoenix app is in so that the assets
# can be built
ARG PHOENIX_SUBDIR=.

ENV SKIP_PHOENIX=${SKIP_PHOENIX} \
    APP_NAME=${APP_NAME} \
    APP_VSN=${APP_VSN} \
    MIX_ENV=${MIX_ENV}

# By convention, /opt is typically used for applications
WORKDIR /opt/app

# This step installs all the build tools we'll need
RUN apk update && \
    apk upgrade --no-cache && \
    apk add --no-cache \
    nodejs \
    npm \
    git \
    build-base && \
    mix local.rebar --force && \
    mix local.hex --force

# This copies our app source code into the build container
COPY . .

RUN mix do deps.get, deps.compile, compile

# This step builds assets for the Phoenix app (if there is one)
# If you aren't building a Phoenix app, pass `--build-arg SKIP_PHOENIX=true`
# This is mostly here for demonstration purposes
RUN if [ ! "$SKIP_PHOENIX" = "true" ]; then \
    cd ${PHOENIX_SUBDIR}/assets && \
    npm install && \
    npm run deploy && \
    cd .. && \
    mix phx.digest; \
    fi

RUN \
    mkdir -p /opt/built && \
    mix release && \
    cp -a _build/${MIX_ENV}/rel/${APP_NAME}/ /opt/built

# ---- Application Stage ----

# From this line onwards, we're in a new image, which will be the image used in production
FROM alpine:${ALPINE_VERSION}
# The name of your application/release (required)
ARG APP_NAME=sip_gateway

RUN apk update && \
    apk add --no-cache \
    bash \
    openssl-dev

WORKDIR /opt/app

COPY --from=builder /opt/built/sip_gateway .

RUN apk add --no-cache libstdc++
# HEALTHCHECK CMD ["curl", "--fail", "http://localhost/api/ping"]

RUN chmod -R 755 /opt/app
CMD ["./bin/sip_gateway", "start"]