How to Install and Secure Redis In-Memory Cache on Ubuntu 24.04

Guide Overview & Architecture Outcome

By following this guide, you will install Redis in-memory cache server on Ubuntu 24.04. You will configure it to bind exclusively to localhost, enforce a strong authentication password, and integrate with systemd supervision.

Step 1: Install Redis Server from Official R... Step 2: Configure Redis for Systemd Supervis... Check That It Worked Troubleshooting

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Prerequisites & System Requirements

An Ubuntu 24.04 server with at least 512 MB free RAM.

Install Redis Server from Official Repositories

Install Redis server and client binaries.

bash · step-1-command.sh

sudo apt update && sudo apt install redis-server -y

Expected System Output:

Installed.

Configure Redis for Systemd Supervision and Local Binding

Update /etc/redis/redis.conf to bind to 127.0.0.1 and enable systemd supervision.

bash · step-2-command.sh

sudo nano /etc/redis/redis.conf
# Set: supervised systemd
# Set: bind 127.0.0.1 ::1
# Set: requirepass YOUR_VERY_LONG_AUTH_KEY
sudo systemctl restart redis-server

Expected System Output:

Redis restarted with password authentication enabled.

Check That It Worked (Verification)

Run this quick verification check to confirm your installation is responding properly:

verify-service.sh

redis-cli -a YOUR_VERY_LONG_AUTH_KEY ping

Expected Response:

PONG

Troubleshooting Common Errors

Quick resolutions for frequent setup pitfalls and configuration issues.

Diagnostic Tips

Redis exposed to the public internet (NOAUTH error)

Check /etc/redis/redis.conf and verify bind 127.0.0.1 is active and not commented out.

OOM command not allowed when used memory > 'maxmemory'

Configure an eviction policy in redis.conf: maxmemory-policy allkeys-lru.

Service fails to start under systemd

Ensure supervised systemd is set and permissions on /var/lib/redis are owned by redis:redis.