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Dockerfile
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# Copyright 2017 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# This Dockerfile will build an image that is configured
# to run Fluentd with an Elasticsearch plug-in and the
# provided configuration file.
# The image acts as an executable for the binary /usr/sbin/td-agent.
# Note that fluentd is run with root permssion to allow access to
# log files with root only access under /var/log/containers/*
FROM gcr.io/google-containers/debian-base-amd64:0.1
COPY Gemfile /Gemfile
# 1. Install & configure dependencies.
# 2. Install fluentd via ruby.
# 3. Remove build dependencies.
# 4. Cleanup leftover caches & files.
RUN BUILD_DEPS="make gcc g++ libc6-dev ruby-dev" \
&& clean-install $BUILD_DEPS \
ca-certificates \
libjemalloc1 \
liblz4-1 \
ruby \
&& echo 'gem: --no-document' >> /etc/gemrc \
&& gem install --file Gemfile \
&& apt-get purge -y --auto-remove \
-o APT::AutoRemove::RecommendsImportant=false \
$BUILD_DEPS \
&& rm -rf /tmp/* \
/var/lib/apt/lists/* \
/usr/lib/ruby/gems/*/cache/*.gem \
/var/log/* \
/var/tmp/* \
# Ensure fluent has enough file descriptors
&& ulimit -n 65536
# Copy the Fluentd configuration file for logging Docker container logs.
COPY fluent.conf /etc/fluent/fluent.conf
COPY run.sh /run.sh
# Expose prometheus metrics.
EXPOSE 80
ENV LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.1
# Start Fluentd to pick up our config that watches Docker container logs.
CMD /run.sh $FLUENTD_ARGS