Redis Fundamentals: Installation and Replication on Linux (Ubuntu & RHEL)

Blog, Database, Devops

Learn Redis fundamentals, including installation, configuration, and master-replica replication on Ubuntu and RHEL Linux.

What Is Redis?

Redis is an in-memory key-value data store used for caching, messaging, and real-time analytics. It offers extremely low latency and supports optional persistence.

Redis Installation

Ubuntu

sudo apt update
sudo apt install redis-server -y
sudo systemctl enable redis-server
sudo systemctl start redis-server

RHEL / Rocky / Alma

sudo dnf install redis -y
sudo systemctl enable redis
sudo systemctl start redis

Verify:

redis-cli ping

Basic Configuration

Edit:

/etc/redis/redis.conf

Key settings:

bind 0.0.0.0
protected-mode yes
requirepass strongpassword

Restart Redis:

systemctl restart redis

Redis Replication (Master–Replica)

Configure Replica Node

Edit redis.conf on replica:

replicaof <master-ip> 6379
masterauth strongpassword

Restart Redis:

systemctl restart redis

Verify Replication

redis-cli info replication

Persistence Options

  • RDB snapshots – periodic backups
  • AOF (Append Only File) – durable logging

Enable AOF:

appendonly yes

Best Practices

  • Use Redis for hot data only
  • Enable authentication
  • Monitor memory usage
  • Combine Redis with a durable database

References

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