nginx+confd startup scripts for docker container

nginx-confd.sh

#!/bin/sh
set -ebm

 syncronize_bakends() {
  echo "[nginx-confd] Synchronizing with confd backends"
  # Loop until confd has updated the nginx config
  until confd --onetime --config-file /etc/confd/confd.toml --log-level error -sync-only; do
    echo "[nginx-confd] waiting for confd to refresh nginx configuration"
    sleep 5
  done
}

 start_confd() {
  echo "[nginx-confd] Starting confd process"
  # Start process
  confd --config-file /etc/confd/confd.toml &
  status=$?
  if [ $status -ne 0 ]; then
    echo "Failed to start confd: $status"
    exit $status
  fi
}

 start_nginx(){
  echo "[nginx-confd] Starting nginx process"
  # Start process
  nginx -g "daemon off;" &
  status=$?
  if [ $status -ne 0 ]; then
    echo "Failed to start nginx: $status"
    exit $status
  fi
}

 supervise(){
  local confd_process_status
  local nginx_process_status
  echo "[nginx-confd] Enter supervision mode"
  sleep 2 # give time for services to start
  while /bin/true; do
    ps aux | grep 'confd --config-file' | grep -q -v grep 
    confd_process_status=$?
    ps aux | grep 'master process nginx' | grep -q -v grep
    nginx_process_status=$?
    # If the greps above find anything, they will exit with 0 status
    # If they are not both 0, then something is wrong
    if [ $confd_process_status -ne 0 -o $nginx_process_status -ne 0 ]; then
      echo "One of the processes has already exited."
      exit -1
    fi
    sleep 10
  done
}


cleanup() {
  # An even simpler way to kill all child process of a bash script
  pkill -P $$
}
trap cleanup EXIT


syncronize_bakends
start_confd
start_nginx
supervise