Running consul on top of CoreOS utilizing etcd for automatic bootstrapping.

gistfile1.txt

#!/bin/bash

source /etc/environment
name=$(cat /etc/machine-id)

if [ ! -f /opt/consul ]; then
        mkdir /opt
        mkdir /var/lib/consul
        curl http://storage.googleapis.com/ifup-org-tilde/consul-0.2.0-linux-x86-64.lzma | lzcat > /opt/consul
        chmod +x /opt/consul
fi

FLAGS="-help "

if etcdctl mk /consul.io/bootstrap/started true; then
        flags="${flags} -bootstrap"
else
        echo "This cluster has already been bootstrapped"
fi

etcdctl set /consul.io/bootstrap/machines/${name} ${COREOS_PRIVATE_IPV4}

flags=$(etcdctl ls /consul.io/bootstrap/machines | while read line; do
        ip=$(etcdctl get ${line})
        echo ${flags} -join ${ip}
done)

echo ${flags}

/opt/consul agent -data-dir /var/lib/consul -server ${flags}

user-data

#cloud-config

coreos:
  etcd:
      discovery: https://discovery.etcd.io/0db899fa78e7485b9bd3b5af73a91f7b
      addr: $public_ipv4:4001
      peer-addr: $public_ipv4:7001
  units:
    - name: etcd.service
      command: start
    - name: consul.service
      command: start
      runtime: no
      content: |
        [Unit]
        Description=fleet

        [Service]
        ExecStartPre=-/usr/bin/mkdir /opt
        ExecStartPre=-/usr/bin/wget --retry-connrefused -t 0 -nc -O /opt/bootstrap-consul https://gist.githubusercontent.com/philips/56fa3f5dae9060fbd100/raw/b0190c7a01a3500e12f92946e6bbf77bc418c3ca/gistfile1.txt
        ExecStartPre=-/usr/bin/chmod +x /opt/bootstrap-consul
        ExecStart=/opt/bootstrap-consul