Reconfigure script for sentinel to update twemproxy when certain redis instance fails.

reconfigure.sh

#!/bin/bash
# <master-name> <role> <state> <from-ip> <from-port> <to-ip> <to-port>
export PATH=/sbin:/usr/local/bin:$PATH
NUTCRACKER_CONF='/opt/nutcracker/conf/nutcracker.yml'
NUTCRACKER_PORT=22121
MASTER_NAME=$1
ROLE=$2
STATE=$3
FROM_IP=$4
FROM_PORT=$5
TO_IP=$6
TO_PORT=$7

if [ "$#" = "7" ]; then
  # Modify nutcracker.yml file
  sed -i s/${FROM_IP}:${FROM_PORT}/${TO_IP}:${TO_PORT}/g ${NUTCRACKER_CONF}

  # Pause traffic on nutcracker while we restart
  iptables -I INPUT -p tcp --dport ${NUTCRACKER_PORT} --syn -j DROP

  # Restart nutcracker
   /etc/init.d/nutcracker restart

  # Resume traffic after restarting
  iptables -D INPUT -p tcp --dport ${NUTCRACKER_PORT} --syn -j DROP

fi