Fluentd V14 with fluent-plugin-parser OK Pattern

Dockerfile

FROM cybercode/alpine-ruby:2.3
LABEL Description="Fluentd docker image" Vendor="Fluent Organization" Version="1.1"

# Do not split this into multiple RUN!
# Docker creates a layer for every RUN-Statement
# therefore an 'apk delete build*' has no effect
RUN apk --no-cache --update add \
                            build-base ruby-dev libc-dev linux-headers libxml2-dev \
                            openssl-dev libxslt-dev \
                            ca-certificates \
                            ruby \
                            ruby-irb \
                            ruby-dev \
                            make \
                            g++ \
                            bash gawk sed grep bc coreutils && \
    echo 'gem: --no-document' >> /etc/gemrc && \
    gem install oj && \
    gem install fluentd -v 0.14.0 && \
    apk del build-base ruby-dev && \
    rm -rf /tmp/* /var/tmp/* /var/cache/apk/*

# for log storage (maybe shared with host)
RUN mkdir -p /fluentd/conf && \
    mkdir -p /fluentd/etc && \
    mkdir -p /fluentd/buffer && \
    mkdir -p /fluentd/dest && \
    mkdir -p /fluentd/plugins

# Tell ruby to install packages as user
RUN echo "gem: --user-install --no-document" >> ~/.gemrc
ENV PATH /root/.gem/ruby/2.3.0/bin:$PATH
ENV GEM_PATH /root/.gem/ruby/2.3.0:$GEM_PATH
ENV LANG ja_JP.UTF-8

ENV FLUENTD_OPT=""
ENV FLUENTD_CONF="/fluentd/conf/fluent-worker.conf"
ENV RUBY_GC_MALLOC_LIMIT=2000000
ENV RUBY_GC_MALLOC_LIMIT_MAX=4000000

RUN gem install fluent-plugin-parser

COPY conf/* /fluentd/conf/
ONBUILD COPY conf/* /fluentd/conf/
ONBUILD COPY plugins/* /fluentd/plugins/

EXPOSE 24224

CMD exec fluentd -c $FLUENTD_CONF -p /fluentd/plugins $FLUENTD_OPT