How to Install Redis on CentOS 9

Redis is a high-performance in-memory data store commonly used for caching, sessions, queues, and real-time workloads. CentOS Stream 9 provides Redis through official repositories, making installation clean and stable.

Step 1: Update System Packages

Start with an up-to-date system.

sudo dnf update -y

Step 2: Install Redis Server

Install Redis from the CentOS 9 repositories:

sudo dnf install -y redis

This installs both the Redis server and the redis-cli tool.

Step 3: Enable and Start Redis Service

Ensure Redis starts automatically and is running:

sudo systemctl enable --now redis

Check service status:

systemctl status redis

You should see active (running).

Step 4: Test Redis Installation

Verify Redis is responding:

redis-cli ping

Expected output:

PONG

Step 5: Configure Redis for systemd Supervision

CentOS 9 uses systemd, so Redis must be supervised correctly.

Edit the configuration file:

sudo nano /etc/redis/redis.conf

Find and set:

supervised systemd

Restart Redis:

sudo systemctl restart redis

Step 6: Secure Redis (Local Access Only)

Redis must never be exposed publicly.

Check bind address:

grep ^bind /etc/redis/redis.conf

It should be:

bind 127.0.0.1 ::1

Also ensure:

protected-mode yes

Restart Redis after changes:

sudo systemctl restart redis