HAProxy and Confd Docker startup script

start_haproxy.sh

#!/usr/bin/env bash

set -eo pipefail

export SHELL="/bin/bash"

readonly ETCD_PORT=4001
readonly ETCD_IP=172.17.42.1
readonly ETCD=$ETCD_IP:$ETCD_PORT
readonly HAPROXY_PIDS="/var/run/haproxy.pid"
readonly HAPROXY_CFG="/etc/haproxy/haproxy.cfg"

checkpid() {
  local pid=$1

  if [[ ! -e /proc/$pid ]]; then
    return 2
  fi
}

checkallpids() {
  local pids=$1

  for pid in $pids; do
    checkpid $pid
  done
}

start_haproxy() {
  haproxy -f $HAPROXY_CFG -p $HAPROXY_PIDS

  local pids=$( < $HAPROXY_PIDS)

  while [[ $? -eq 0 ]]; do
    sleep 5
    checkallpids $pids
  done
}


codep() {
  set -eo monitor
  trap 'kill $(jobs -p) &> /dev/null' EXIT
  trap 'exit 2' CHLD
  for child in "$@"; do
    eval "$child &"
  done
  wait
}

start() {
  nginx -v
  codep 'start_haproxy' \
    'confd -verbose -interval 30 -node $ETCD -config-file /etc/confd/conf.d/firehose-nginx.toml'
}

start