Dockerfile

FROM alpine:latest

# Install system dependencies
RUN ["apk", "update"]
RUN ["apk", "add", "ruby", "ruby-bundler", "ruby-dev", "ruby-json", "libffi-dev", "musl-dev", "gcc", "make"]

# Set up user and working space
RUN ["adduser", "-h", "/nrql_exporter", "-D", "nrql_exporter"]
USER "nrql_exporter"
COPY [".", "/nrql_exporter/"]
WORKDIR "/nrql_exporter"

# Get ruby dependencies
RUN ["sh", "-c", "echo 'gem: --no-document' > /nrql_exporter/.gemrc"]
RUN ["mkdir", ".gems"]
ENV GEM_HOME="/nrql_exporter/.gems"
RUN ["bundle", "install"]

# Remove system build tools now they're no-longer needed
USER "root"
RUN ["apk", "del", "ruby-bundler", "ruby-dev", "libffi-dev", "musl-dev", "gcc", "make"]

# Showtime!
USER "nrql_exporter"
ENV NRQL_EXPORTER_CONFIG="/nrql_exporter/nrql_exporter.conf"
CMD ["/nrql_exporter/nrql_exporter"]