Get a healthcheck on zookeeper. must be a version that responds to ruok.

check_zookeeper.sh

#!/bin/sh

HOST=$1
PORT=$2

TIMEOUT=5

if [ ! -x /usr/bin/nc ] ; then
    echo "/usr/bin/nc is missing; required for $0 to run"
    exit 3
fi

if [ -z "$HOST" ] ; then
    echo "Specify a host to check"
    exit 3
fi

if [ -z "$PORT" ] ; then
    echo "Specify a zookeeper port to check"
    exit 3 
fi

RUOK=`echo ruok | /usr/bin/nc -w $TIMEOUT $HOST $PORT`

if [ $? == 1 ] ; then
    echo "CRITICAL: Zookeeper on $HOST:$PORT is down"
    exit 2
fi

if [ "$RUOK" != "imok" ] ; then
    echo "CRITICAL: Zookeeper on $HOST:$PORT is not ok"
    exit 2
else 
    echo "OK: Zookeeper on $HOST:$PORT is responding"
    exit 0
fi