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Dockerfile
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#
# Step 1 - build the OTP binary
#
FROM elixir:1.8-alpine AS builder
ARG APP_NAME
ARG APP_VERSION
ARG MIX_ENV=prod
ENV APP_NAME=${APP_NAME} \
APP_VERSION=${APP_VERSION} \
MIX_ENV=${MIX_ENV}
WORKDIR /build
# This step installs all the build tools we'll need
RUN apk update && \
apk upgrade --no-cache && \
apk add --no-cache nodejs~=10.14 npm~=10.14 git build-base
RUN mix local.rebar --force && \
mix local.hex --force
# This copies our app source code into the build container
COPY mix.* ./
RUN mix deps.get --only ${MIX_ENV}
COPY . .
RUN mix compile --force
RUN npm ci --prefix assets --no-audit --no-color --unsafe-perm
# Compile assets and generate digest filenames
RUN npm run --prefix assets deploy
RUN mix phx.digest
RUN mkdir -p /opt/build && \
mix release --verbose && \
cp _build/${MIX_ENV}/rel/${APP_NAME}/releases/${APP_VERSION}/${APP_NAME}.tar.gz /opt/build
RUN cd /opt/build && \
tar -xzf ${APP_NAME}.tar.gz && \
rm ${APP_NAME}.tar.gz
#
# Step 2 - build a lean runtime container
#
FROM alpine:3.9
ARG APP_NAME
ENV APP_NAME=${APP_NAME}
# Update kernel and install runtime dependencies
RUN apk --no-cache update && \
apk --no-cache upgrade && \
apk --no-cache add bash openssl-dev erlang-crypto
WORKDIR /opt/elixir_boilerplate
# Copy the OTP binary from the build step
COPY --from=builder /opt/build .
# Copy the entrypoint script
COPY priv/scripts/docker-entrypoint.sh /usr/local/bin
RUN chmod a+x /usr/local/bin/docker-entrypoint.sh
# Create a non-root user
RUN adduser -D elixir_boilerplate && \
chown -R elixir_boilerplate: /opt/elixir_boilerplate
USER elixir_boilerplate
ENTRYPOINT ["docker-entrypoint.sh"]
CMD ["foreground"]