Step-by-Step Guide to Setting Up Redis Master‑Slave Replication and Sentinel Cluster on CentOS 7

This guide explains how to build a Redis master‑slave replication and Sentinel cluster on three CentOS 7 machines, which improves performance and provides high‑availability for web applications.

1. Environment preparation : allocate three Linux servers (e.g., 192.168.1.101‑103) and ensure Redis 6.0.3 is available.

2. Install and compile Redis :

# cd /usr/local/src
# wget https://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 previous builds:

# yum -y install gcc-c++
# make clean
# make

After a successful build, start the server:

# cd src
# ./redis-server ../redis.conf

3. Configure daemon and process management : daemonize yes Check the running process and stop it if necessary:

# ps -aux | grep redis
# kill -9 <pid>

4. Enable service at boot :

# mkdir /etc/redis
# cp /usr/local/src/redis-6.0.3/redis.conf /etc/redis/6379.conf
# cp /usr/local/src/redis-6.0.3/utils/redis_init_script /etc/init.d/redisd
# chkconfig redisd on

Start and stop the service with:

# service redisd start
# service redisd stop

5. Adjust firewall and Redis configuration :

# systemctl stop firewalld   # or open port 6379
# In redis.conf comment out "bind 127.0.0.1" and set "protected-mode no"
# requirepass 123456
# masterauth 123456

6. Set up slave servers in their redis.conf:

slaveof 192.168.1.101 6379
requirepass 123456
masterauth 123456

7. Configure Sentinel (sentinel.conf):

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 launching the master, slaves, and Sentinel, verify the cluster is operational and that failover works as expected.