# This Dockerfile will build an image that is configured
# to run Fluentd with an Elasticsearch plug-in and the
# provided configuration file.
# TODO(satnam6502): Use a lighter base image, e.g. some form of busybox.
# 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/lib/docker/containers/*
# Please see http://docs.fluentd.org/articles/install-by-deb for more
# information about installing fluentd using deb package.

FROM ubuntu:14.04
MAINTAINER Satnam Singh "satnam@google.com"

# Ensure there are enough file descriptors for running Fluentd.
RUN ulimit -n 65536

# Install prerequisites.
RUN apt-get update && \
    apt-get install -y curl && \
    apt-get install -y -q libcurl4-openssl-dev make && \
    apt-get clean

# Install Fluentd.
RUN /usr/bin/curl -L http://toolbelt.treasuredata.com/sh/install-ubuntu-trusty-td-agent2.sh | sh

# Change the default user and group to root.
# Needed to allow access to /var/log/docker/... files.
RUN sed -i -e "s/USER=td-agent/USER=root/" -e "s/GROUP=td-agent/GROUP=root/" /etc/init.d/td-agent

# Install the Elasticsearch Fluentd plug-in.
RUN /usr/sbin/td-agent-gem install fluent-plugin-elasticsearch

# Copy the Fluentd configuration file.
COPY td-agent.conf /etc/td-agent/td-agent.conf

# Copy a script that determines the name of the host machine
# and then patch the Fluentd configuration files and then
# run Fluentd in the foreground.
ADD run.sh /run.sh

# Always run the this setup script.
ENTRYPOINT ["/run.sh"]
