Missing start-stop-deamon on centos 6.8

I am trying to run node_exporter for prometheus on centos 6.8. Here is the init.d script I was able to create:

    #!/bin/sh

### BEGIN INIT INFO
# Provides:          Node exporter
# Required-Start:    $local_fs $network $named $time $syslog
# Required-Stop:     $local_fs $network $named $time $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Description:       Node exporter for prometheus written in Go
### END INIT INFO

DAEMON=/home/prometheus/node_exporter-0.14.0.linux-amd64
NAME=node_exporter
USER=prometheus
PIDFILE=/var/run/prometheus/$NAME.pid
LOGFILE=/var/log/prometheus/$NAME.log

ARGS=""
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

do_start_prepare()
{
    mkdir -p `dirname $PIDFILE` || true
    mkdir -p `dirname $LOGFILE` || true
    chown -R $USER: `dirname $LOGFILE`
    chown -R $USER: `dirname $PIDFILE`
}

do_start_cmd()
{
    do_start_prepare
    echo -n "Starting daemon: "$NAME
    start-stop-daemon --chuid $USER -C --background --start --quiet --pidfile $PIDFILE --make-pidfile --exec $DAEMON -- $ARGS >> $LOGFILE 2>&1
    echo "."
}

do_stop_cmd()
{
    echo -n "Stopping daemon: "$NAME
    start-stop-daemon --stop --quiet --oknodo --pidfile $PIDFILE
    rm $PIDFILE
    echo "."
}

uninstall() {
  echo -n "Are you really sure you want to uninstall this service? That cannot be undone. [yes|No] "
  local SURE
  read SURE
  if [ "$SURE" = "yes" ]; then
    stop
    rm -f "$PIDFILE"
    echo "Notice: log file was not removed: '$LOGFILE'" >&2
    update-rc.d -f <NAME> remove
    rm -fv "$0"
  fi
}

status() {
        printf "%-50s" "Checking $NAME..."
    if [ -f $PIDFILE ]; then
        PID=$(cat $PIDFILE)
            if [ -z "$(ps axf | grep ${PID} | grep -v grep)" ]; then
                printf "%s\n" "The process appears to be dead but pidfile still exists"
            else    
                echo "Running, the PID is $PID"
            fi
    else
        printf "%s\n" "Service not running"
    fi
}


case "$1" in
  start)
    do_start_cmd
    ;;
  stop)
    do_stop_cmd
    ;;
  status)
    status
    ;;
  uninstall)
    uninstall
    ;;
  restart)
    stop
    start
    ;;
  *)
    echo "Usage: $1 {start|stop|status|restart|uninstall}"
    exit 1
esac

exit 0

and here is the output when I run it.

[prometheus@prometheus init.d]$ service node_exporter start
Starting daemon: node_exporter.

but then nothing happen when I check the status:

[prometheus@prometheus init.d]$ service node_exporter status
Checking node_exporter...                         Service not running

here is the log in /var/log/prometheus/node_exporter.log

/etc/init.d/node_exporter: line 35: start-stop-daemon: command not found

here is the output of "which":

[prometheus@prometheus prometheus]$ which start-stop-daemon
/usr/bin/which: no start-stop-daemon in (/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin)

I really need some guidance here since I mostly used CentOS 7 and not well familiar with init.d scripts