Hadoop Nagios check namenode storage mounts

check_namenode_storage.sh

#! /bin/bash

function http { (exec 3<>/dev/tcp/$1/$2; echo -e "$3 $4 HTTP/1.0\r\n\r\n" >&3; cat <&3); }

ACTIVEMOUNTS=$(http localhost 50070 GET /dfshealth.jsp | grep "Storage Directory" | sed -e 's/<tr>/\n/g' | grep -c Active)
if [ $ACTIVEMOUNTS -lt 3 ]; then
	echo "CRITICAL - $ACTIVEMOUNTS storage directories active"
	exit 2
fi

echo "OK - $ACTIVEMOUNTS storage directories active"
exit 0