Dockerfile

FROM ruby:2.4.3-alpine3.7

ARG GOLANG_VERSION="1.9.4-r0"
ARG BUILD_DEPS="go=$GOLANG_VERSION ruby-dev linux-headers curl curl-dev pcre-dev libexecinfo-dev@edge-main"
ARG RUNTIME_DEPS="tini build-base pcre git libexecinfo@edge-main"

RUN echo '@edge-main http://dl-cdn.alpinelinux.org/alpine/edge/main/' >> /etc/apk/repositories && \
    apk update && \
    apk upgrade && \
    apk add $BUILD_DEPS && \
    apk add $RUNTIME_DEPS && \
    mkdir -p /opt

# Passenger
ENV PASSENGER_VERSION="5.1.12" \
    PATH="/opt/passenger/bin:$PATH"
RUN curl -L "https://s3.amazonaws.com/phusion-passenger/releases/passenger-$PASSENGER_VERSION.tar.gz" | tar -xzf - -C /opt && \
    mv /opt/passenger-$PASSENGER_VERSION /opt/passenger && \
    passenger-config validate-install --auto && \
    export EXTRA_PRE_CFLAGS='-O' EXTRA_PRE_CXXFLAGS='-O' EXTRA_LDFLAGS='-lexecinfo' && \
    passenger-config compile-agent --optimize && \
    passenger-config install-standalone-runtime && \
    passenger-config build-native-support

# Go configuration
ENV GOROOT="/usr/lib/go" \
    GOPATH="/go"
ENV PATH="$GOPATH/bin:$GOROOT/bin:$PATH"

# Go dependencies
RUN go get github.com/prometheus/promu

# Configure source path
ARG SOURCE_PATH="/go/src/github.com/Intellection/passenger-exporter"
RUN mkdir -p ${SOURCE_PATH}

# Add source files
ADD . ${SOURCE_PATH}/
WORKDIR ${SOURCE_PATH}

# Build exporter
RUN promu build && \
    mv ${SOURCE_PATH}/passenger-exporter /usr/local/bin/passenger-exporter && \
    rm -rf ${SOURCE_PATH}/*

# Cleanup
RUN apk del $BUILD_PACKAGES && \
    rm -rf /var/cache/apk/*

USER nobody:nobody

ENTRYPOINT ["tini", "--", "passenger-exporter"]
CMD ["/bin/sh"]