add nginx-confd

nginx-confd/Dockerfile

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+FROM debian:jessie
+
+MAINTAINER Ric Lister <rlister@gmail.com>
+
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive \
+    apt-get install -yq \
+    curl \
+    nginx && \
+    rm /etc/nginx/sites-enabled/default
+
+WORKDIR /app
+
+## install confd
+ENV CONFD_RELEASE 0.7.1
+RUN curl -Ls https://github.com/kelseyhightower/confd/releases/download/v${CONFD_RELEASE}/confd-${CONFD_RELEASE}-linux-amd64 -o confd && \
+    chmod 0755 confd
+
+## confd setup and runner
+ADD app.sh /app/
+RUN chmod 0755 app.sh
+
+EXPOSE 80 443
+
+CMD [ "/app/app.sh" ]

nginx-confd/app.sh

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+#!/bin/bash
+
+## make sure this script bails on any failures
+set -eo pipefail
+
+## how to get to etcd from inside container
+export ETCD=${ETCD:-http://172.17.42.1:4001}
+
+## wait until we can make initial nginx config
+until ./confd -verbose -onetime -node $ETCD -confdir /app ; do
+  echo "confd waiting to create initial nginx config"
+  sleep 5
+done
+
+## run confd to poll etcd for changes
+echo "confd polling etcd ..."
+./confd -verbose -interval 10 -node $ETCD -confdir /app &
+
+## run nginx in foreground
+nginx -g 'daemon off;'