boot.sh

#!/bin/bash

# Fail hard and fast
set -eo pipefail

export ETCD_PORT=${ETCD_PORT:-4001}
export HOST_IP=${HOST_IP:-172.17.42.1}
export ETCD=$HOST_IP:4001

echo "[nginx] booting container. ETCD: $ETCD"

# Loop until confd has updated the nginx config
until confd -onetime -node $ETCD -config-file /etc/confd/conf.d/nginx.toml; do
  echo "[nginx] waiting for confd to refresh nginx.conf"
  sleep 5
done

# Run confd in the background to watch the upstream servers
confd -interval 10 -node $ETCD -config-file /etc/confd/conf.d/nginx.toml &
echo "[nginx] confd is listening for changes on etcd..."

# Start nginx
echo "[nginx] starting nginx service..."
service nginx start

# Tail all nginx log files
tail -f /var/log/nginx/*.log

hello.service

[Unit]
Description=Hello World
After=docker.service
Requires=docker.service

[Service]
EnvironmentFile=/etc/environment
#ExecStartPre=/usr/bin/etcdctl set /ez/server/test.example.com/%m ${COREOS_PUBLIC_IPV4}
#ExecStart=/usr/bin/docker run --name test --rm -p :80 joshuaconner/hello-world-docker-bottle
ExecStart=/bin/bash -c '/usr/bin/docker start -a test || /usr/bin/docker run --rm --name test -p :80 joshuaconner/hello-world-docker-bottle'
ExecStartPost=/bin/bash -c '/usr/bin/etcdctl set /ez/server/test.example.com $(/usr/bin/docker port test 80)'
ExecStop=/usr/bin/etcdctl rm /ez/server/test.example.com
ExecStop=/usr/bin/docker kill test

nginx.conf.tmpl

{{ range $server := .ez_server }}

server {
    server_name {{ $server.Key }};

    location / {
        proxy_pass {{ $server.Value }};
        proxy_redirect off;
        proxy_set_header Host $host;
        proxy_set_header X-Real-UP $remote_add;
        proxy_set_header X-Forwarded-For $proxy_add_x_formwarded_for;
    }
}

{{ end }}