Initial

fluentd/Dockerfile

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+# image based on fluentd v1.14-1
+FROM fluentd:v1.14-1
+# Use root account to use apk
+USER root
+# Install the required version of faraday
+RUN gem uninstall -I faraday
+RUN gem install faraday -v 2.8.1
+# Install dependencies and gems
+RUN apk --no-cache --update add \
+    sudo \
+    build-base \
+    ruby-dev \
+  && gem uninstall -I elasticsearch \
+  && gem install elasticsearch -v 7.17.0 \
+  && gem install fluent-plugin-elasticsearch \
+  && gem sources --clear-all \
+  && apk del build-base ruby-dev \
+  && rm -rf /tmp/* /var/tmp/* /usr/lib/ruby/gems/*/cache/*.gem
+# Copy fluentd configuration from host image
+COPY ./conf/fluent.conf /fluentd/etc/
+# Copy binary start file
+COPY entrypoint.sh /bin/
+RUN chmod +x /bin/entrypoint.sh
+USER fluent

fluentd/conf/fluent.conf

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+# bind fluentd on IP 0.0.0.0
+# port 24224
+<source>
+  @type forward
+  port 24224
+  bind 0.0.0.0
+</source>
+# sendlog to the elasticsearch
+# the host must match to the elasticsearch
+# container service
+<match *.**>
+  @type copy
+  <store>
+    @type elasticsearch
+    host elasticsearch
+    port 9200
+    logstash_format true
+    logstash_prefix fluentd
+    logstash_dateformat %Y%m%d
+    include_tag_key true
+    type_name access_log
+    tag_key @log_name
+    flush_interval 20s
+  </store>
+  <store>
+    @type stdout
+  </store>
+</match>

fluentd/entrypoint.sh

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+#!/bin/sh
+# Source vars if file exists
+DEFAULT=/etc/default/fluentd
+if [ -r $DEFAULT ]; then
+    set -o allexport
+    . $DEFAULT
+    set +o allexport
+fi
+# If the user has supplied only arguments, append them to `fluentd` command
+if [ "${1#-}" != "$1" ]; then
+    set -- fluentd "$@"
+fi
+# If the user does not supply a config file or plugins, use the default
+if [ "$1" = "fluentd" ]; then
+    if ! echo $@ | grep -e ' \-c' -e ' \-\-config' ; then
+      set -- "$@" --config /fluentd/etc/${FLUENTD_CONF}
+    fi
+    if ! echo $@ | grep -e ' \-p' -e ' \-\-plugin' ; then
+      set -- "$@" --plugin /fluentd/plugins
+    fi
+fi
+exec "$@"