redis-sentinel.sh

#!/bin/bash
#Script for Install and configure Redis cluster + Sentinel
#KeepWalking86

#Initial
MASTER_IP=192.168.1.111
SLAVE1_IP=192.168.1.112
SLAVE2_IP=192.168.1.113
REDIS_PORT=6379
SENTINEL_PORT=26389

echo "Welcome to install and configure Redis cluster + Sentinel"
sleep 3


#check for root user
if [ "$(id -u)" -ne 0 ] ; then
        echo "Please, run this script as root account!"
        exit 1
fi

#Check OS and install essential package to compile redis
if [ -f /etc/debian_version ] ; then
	apt-get -y install build-essential
else
	if [ -f /etc/redhat-release ] ; then
		yum -y groupinstall "Development Tools"
	else
		echo "Distro hasn't been supported by this script"
	        exit 1
	fi
fi

#Installing redis
cd /opt
curl -O http://download.redis.io/redis-stable.tar.gz
tar xzvf redis-stable.tar.gz
cd redis-stable
make
cp /opt/redis-stable/src/redis-cli /usr/bin/
cp /opt/redis-stable/src/redis-server /usr/bin/

#Configure redis
mkdir /etc/redis/
mkdir /var/log/redis/
cp /opt/redis-stable/redis.conf /etc/redis/
sed -i 's/supervised no/supervised systemd/' /etc/redis/redis.conf
sed -i 's/dir .\//dir \/var\/lib\/redis/' /etc/redis/redis.conf
sed -i '/bind 127.0.0.1/c\bind 0.0.0.0' /etc/redis/redis.conf
sed -i '/logfile/c\logfile "/var/log/redis/redis.log"' /etc/redis/redis.conf

#Set up the systemd unit file
cat >/etc/systemd/system/redis.service<<EOF
[Unit]
Description=Redis In-Memory Data Store
After=network.target
[Service]
ExecStart=/usr/bin/redis-server /etc/redis/redis.conf
ExecStop=/usr/bin/redis-cli shutdown
Restart=always
[Install]
WantedBy=multi-user.target
EOF

#redis dump
mkdir -p /var/lib/redis
chmod 770 /var/lib/redis

#Start and enable redis server
systemctl start redis
systemctl enable redis

##Setup Redis cluster
#Configure replication
IP_ADDR=`ip route get 1.1.1.1 | grep -oP 'src \K\S+'`
if [ $IP_ADDR == $SLAVE1_IP ] || [ $IP_ADDR == $SLAVE2_IP ] ; then
	echo "slaveof $MASTER_IP $REDIS_PORT" >>/etc/redis/redis.conf
	systemctl restart redis.service
fi

#Configure redis sentinel
cat >/etc/redis/sentinel.conf<<EOF
daemonize yes
pidfile /var/run/redis/redis-sentinel.pid
logfile /var/log/redis/redis-sentinel.log
bind 0.0.0.0
port 26379
sentinel monitor mymaster $MASTER_IP $REDIS_PORT 2
sentinel down-after-milliseconds mymaster 2000
sentinel failover-timeout mymaster 60000
sentinel parallel-syncs mymaster 1
EOF

#Start redis-sentinel
cat >/etc/systemd/system/redis-sentinel.service<<EOF
[Unit]
Description=Redis Sentinel
After=network.target
[Service]
ExecStart=/usr/bin/redis-server /etc/redis/sentinel.conf --sentinel --daemonize no
Restart=always
[Install]
WantedBy=multi-user.target
EOF
systemctl start redis-sentinel.service
systemctl enable redis-sentinel.service