A simple script to check Redis Cluster

Below is a simple script around the redis-cli tool that aims to give info about a replica cluster and to identify the redis master node.
This can be a simple fast check for redis.

Below is the script:

[redis@feanor]$ cat check_redis.sh
echo " "
REDIS_BIN=.
echo "Getting Master Info from Sentinel"

MASTER_IP=`$REDIS_BIN/redis-cli -p 9000 info sentinel | grep "master0:name=mymaster"|cut -d"," -f3|cut -d"=" -f2|cut -d":" -f1`
MASTER_PORT=`$REDIS_BIN/redis-cli -p 9000 info sentinel | grep "master0:name=mymaster"|cut -d"," -f3|cut -d"=" -f2|cut -d":" -f2`
MASTER_STATUS=`$REDIS_BIN/redis-cli -p 9000 info sentinel | grep "master0:name=mymaster"|cut -d"," -f2|cut -d"=" -f2`
MASTER_HOSTNAME=`nslookup $MASTER_IP|grep "name = " |cut -d"=" -f2`

echo "Master IP is: $MASTER_IP"
echo "Master Port is: $MASTER_PORT"
echo "Master Hostname is: $MASTER_HOSTNAME"
echo "Master Status is:  $MASTER_STATUS"
echo " "
echo "Replication info from Master:"
$REDIS_BIN/redis-cli -h $MASTER_IP -p $MASTER_PORT info replication
[redis@feanor]$

In this case Redis-server runs on port 7000 and Redis-Sentinel on port 9000.

I have allowed the script to extract the port form sentinel output as at times we have more than one Redis instance running on the same VM, thus using same IP but different port.