How to Build a Redis Master‑Slave Replication and Sentinel Cluster on CentOS 7

Redis can distribute data across multiple servers to handle high concurrency and load, improving website performance and relieving MySQL read‑write pressure; therefore building a master‑slave replication and Sentinel cluster is essential for large‑scale sites.

Environment and versions : three CentOS 7 virtual machines with IPs 192.168.1.101, 192.168.1.102, 192.168.1.103 and Redis 6.0.3 (latest) installed under /usr/local/src .

Installation :

cd /usr/local/src
wget http://download.redis.io/releases/redis-6.0.3.tar.gz
tar xzf redis-6.0.3.tar.gz
cd redis-6.0.3
make

If compilation fails, install the C++ compiler and clean before rebuilding:

yum -y install gcc-c++
make clean
make CFLAGS="-march=x86-64"

Start the service using the configuration file:

redis-server /usr/local/src/redis.conf

Check the process with ps aux | grep redis and stop it if necessary using kill -9 <pid> . Enable daemon mode by adding daemonize yes to redis.conf .

Configure system startup :

mkdir /etc/redis
cp /usr/local/src/redis-6.0.3/redis_init_script/init.d /etc/redis/redisd
chmod +x /etc/redis/redisd
chkconfig redisd on

Control the service with service redisd start and service redisd stop .

Client connection settings : disable the firewall or open port 6379, then edit redis.conf to comment out the bind 127.0.0.1 line, set protected-mode no , and add authentication:

requirepass 123456
masterauth 123456

Sentinel mode (high‑availability): configure three servers as one master (192.168.1.101) and two slaves (192.168.1.102, 192.168.1.103). In the master’s redis.conf set the same password as above. In each slave’s redis.conf add:

slaveof 192.168.1.101 6379
masterauth 123456

Create sentinel.conf with the following key directives:

protected-mode no
sentinel monitor mymaster 192.168.1.101 6379 2
sentinel auth-pass mymaster 123456

Start Sentinel with:

redis-server /path/to/sentinel.conf --sentinel

After starting the master, the slaves, and Sentinel, the Redis cluster is fully operational and ready for production use.