How to Install Redis on Ubuntu 24.04 LTS for Magento

Redis is one of the most important technologies for improving Magento performance. It stores frequently accessed data in memory, allowing Magento to retrieve information much faster than repeatedly querying the database.

Whether you're running a development store or a production eCommerce website, Redis significantly improves page load times, reduces server load, and provides a better shopping experience for customers.

In this guide, you'll learn how to install Redis on Ubuntu 24.04 LTS, configure it securely, optimize it for Magento, verify the installation, and troubleshoot common issues.

What is Redis?

Redis (Remote Dictionary Server) is an open-source, in-memory data store used as a:

• Cache
• Session Storage
• Message Broker
• Key-Value Database

Unlike MySQL, Redis stores data directly in memory (RAM), making read and write operations extremely fast.

Many high-traffic applications use Redis because of its exceptional performance and low latency.

Popular platforms using Redis include:

• Magento
• WordPress
• Laravel
• GitLab
• Stack Overflow
• Shopify

Why Magento Uses Redis

Magento performs thousands of database queries during normal operation.

Without caching, every request requires Magento to:

• Load configuration
• Read session data
• Generate cache
• Load layout XML
• Read product information

Redis reduces this workload dramatically.

Magento uses Redis for:

• Default Cache
• Page Cache
• User Sessions

This results in:

• Faster page loading
• Reduced MySQL load
• Better scalability
• Improved checkout performance
• Lower server resource usage

Redis Architecture

Redis stores data entirely in memory.

Unlike relational databases, Redis organizes information using key-value pairs.

Example:

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customer_session_1024
↓

{
   customer_id: 55,
   cart_items: 3
}

Because the data is already stored in RAM, Redis can return results in milliseconds.

System Requirements

Before installing Redis, ensure your server meets these recommendations.

💡 Tip

Redis performs best when sufficient RAM is available. For production Magento stores, 8 GB or more of memory is recommended.

Prerequisites

Before continuing, you should have already completed:

• Install PHP
• Install Composer
• Install MySQL
• Install OpenSearch

These components form the foundation of a production-ready Magento server.

Step 1 — Update Ubuntu

Begin by updating the package index.

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sudo apt update
sudo apt upgrade -y

Keeping your server updated ensures you're installing the latest Redis packages and security updates.

Step 2 — Install Redis

Ubuntu 24.04 includes Redis in the official repositories.

Install Redis using:

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sudo apt install redis-server -y

The installation usually completes within a few seconds.

Step 3 — Verify Redis Installation

Check the installed version.

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redis-server --version

Example output:

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Redis server v=7.x.x

This confirms Redis has been installed successfully.

Step 4 — Enable Redis at Boot

Enable Redis so it automatically starts after every server reboot.

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sudo systemctl enable redis-server

Expected output:

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Created symlink...

Step 5 — Start Redis

Start the Redis service.

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sudo systemctl start redis-server

Verify the service.

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sudo systemctl status redis-server

Expected output:

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Active: active (running)

If Redis is running successfully, the installation is complete.

What We've Completed

At this point you've successfully:

• Updated Ubuntu
• Installed Redis
• Verified the installation
• Enabled automatic startup
• Started the Redis service

Step 6 — Configure Redis

The main Redis configuration file is located at:

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/etc/redis/redis.conf

Open the file using your preferred text editor.

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sudo nano /etc/redis/redis.conf

This file controls how Redis behaves, including network access, memory management, persistence, and security.

Step 7 — Configure the Bind Address

Locate the following line.

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bind 127.0.0.1 -::1

This ensures Redis accepts connections only from the local machine.

For most Magento installations, this is the recommended configuration because Magento and Redis typically run on the same server.

💡 Tip

Avoid exposing Redis directly to the public internet. Redis is designed to be used within trusted networks.

Step 8 — Enable Password Authentication

Although Redis is usually accessible only locally, adding authentication provides an additional layer of security.

Search for:

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# requirepass foobared

Replace it with a strong password.

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requirepass YourStrongRedisPassword

Choose a long, unique password that isn't used elsewhere.

Save the configuration before continuing.

Step 9 — Configure Memory Limits

Redis stores data in RAM, so it's important to define a maximum memory limit.

Search for:

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# maxmemory <bytes>

Example:

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maxmemory 2gb

Choose a value appropriate for your server.

Recommended Values

Leave enough RAM for:

• Ubuntu
• PHP
• MySQL
• OpenSearch
• Nginx

Step 10 — Configure the Eviction Policy

When Redis reaches the configured memory limit, it needs to know which keys should be removed.

Locate:

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# maxmemory-policy noeviction

For Magento, use:

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maxmemory-policy allkeys-lru

What Does allkeys-lru Mean?

Redis removes the least recently used keys first.

This policy works well because Magento constantly regenerates cache entries when needed.

Step 11 — Configure Persistence

Redis supports two persistence methods:

• RDB Snapshots
• AOF (Append Only File)

Magento primarily uses Redis as a cache, so persistence requirements depend on how you use Redis.

For cache storage, the default snapshot configuration is generally sufficient.

If you're also storing sessions or other critical data in Redis, review your persistence settings to ensure they match your recovery requirements.

Step 12 — Restart Redis

After making configuration changes, restart the service.

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sudo systemctl restart redis-server

Verify the service.

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sudo systemctl status redis-server

Expected output:

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Active: active (running)

Step 13 — Verify Redis is Working

Redis includes a built-in command-line client.

Run:

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redis-cli

If password authentication is enabled, authenticate first:

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AUTH YourStrongRedisPassword

Now test the connection.

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PING

Expected response:

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PONG

This confirms Redis is running correctly.

Exit the Redis CLI.

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EXIT

Step 14 — Test Read and Write Operations

Store a value.

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redis-cli

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SET website "Paridhi Solutions"

Redis should respond:

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OK

Retrieve the value.

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GET website

Output:

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"Paridhi Solutions"

Delete the key.

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DEL website

Exit Redis.

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EXIT

This confirms Redis can successfully store and retrieve data.

Step 15 — Verify the Listening Port

Redis listens on port 6379 by default.

Check that the service is listening.

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sudo ss -tulpn | grep 6379

Example output:

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LISTEN 0 511 127.0.0.1:6379

This confirms Redis is accepting local connections.

Step 16 — Monitor Redis

Redis provides useful runtime information.

View server statistics.

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redis-cli INFO

To inspect memory usage:

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redis-cli INFO memory

To monitor connected clients:

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redis-cli INFO clients

These commands are especially useful when troubleshooting performance issues or monitoring a production environment.

What We've Completed

Congratulations! At this point you've:

• Configured Redis
• Secured it with a password
• Limited memory usage
• Configured the eviction policy
• Restarted the service
• Verified connectivity
• Tested read/write operations
• Confirmed Redis is listening on the expected port
• Learned how to monitor Redis

Step 17 — Configure Magento to Use Redis

Magento supports Redis for three different purposes:

• Default Cache
• Full Page Cache
• User Sessions

Using Redis for all three significantly improves performance and reduces database load.

You can configure Redis during Magento installation or later using the Magento CLI.

To verify your current cache configuration:

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php bin/magento cache:status

After configuring Redis, flush the cache.

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php bin/magento cache:flush

Verify Redis is Being Used

You can monitor Redis activity in real time.

Open a terminal and run:

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redis-cli monitor

Now browse your Magento store in another browser window.

You'll see Redis commands appearing in real time, confirming Magento is communicating with Redis.

Press Ctrl + C to stop monitoring.

Production Best Practices

Installing Redis is only the first step. Proper configuration ensures long-term stability and performance.

Keep Redis Updated

Regularly install security updates.

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sudo apt update
sudo apt upgrade

Monitor Memory Usage

Check available memory.

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free -h

View Redis memory statistics.

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redis-cli INFO memory

If Redis frequently reaches its configured memory limit, increase the available RAM or adjust the memory allocation.

Monitor Connected Clients

Display active client connections.

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redis-cli INFO clients

Unexpected spikes may indicate application issues or unusual traffic.

Monitor Redis Statistics

View server statistics.

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redis-cli INFO stats

Useful metrics include:

• Cache Hits
• Cache Misses
• Commands Processed
• Expired Keys
• Evicted Keys

Monitoring these values helps identify caching inefficiencies.

Review Redis Logs

If Redis isn't behaving as expected, check the logs.

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sudo journalctl -u redis-server

or

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sudo tail -f /var/log/redis/redis-server.log

Logs often reveal configuration problems or startup failures.

Security Recommendations

Redis is extremely fast, but it should also be secured.

Keep Redis Private

Use:

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bind 127.0.0.1

This limits access to the local server.

Enable Password Authentication

Configure a strong password.

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requirepass YourStrongRedisPassword

Never use simple passwords in production.

Restrict Firewall Access

If Redis is running on a separate server, allow access only from trusted hosts.

Example using UFW:

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sudo ufw allow from YOUR_MAGENTO_SERVER_IP to any port 6379

Avoid opening Redis to the entire internet.

Troubleshooting

Redis Service Won't Start

Check the service.

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sudo systemctl status redis-server

Review logs.

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sudo journalctl -u redis-server

Connection Refused

Verify Redis is running.

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redis-cli ping

Expected response:

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PONG

If authentication is enabled:

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redis-cli

AUTH YourStrongRedisPassword

PING

Authentication Failed

If you receive:

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NOAUTH Authentication required.

Authenticate first.

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AUTH YourStrongRedisPassword

Port 6379 Already in Use

Identify the conflicting process.

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sudo ss -tulpn | grep 6379

or

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sudo lsof -i :6379

Resolve the conflict before restarting Redis.

High Memory Usage

Check memory statistics.

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redis-cli INFO memory

Possible solutions:

• Increase available RAM.
• Reduce the Redis memory limit.
• Review eviction policies.
• Remove unused keys.

Slow Performance

Monitor Redis in real time.

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redis-cli monitor

Review:

• Large keys
• Long-running commands
• Excessive write operations

These can impact overall performance.

Frequently Asked Questions

What is Redis used for in Magento?

Redis stores:

• Default Cache
• Full Page Cache
• Customer Sessions

This improves performance by reducing the number of database queries.

Which port does Redis use?

By default:

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6379

How do I restart Redis?

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sudo systemctl restart redis-server

How do I stop Redis?

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sudo systemctl stop redis-server

How do I check the Redis version?

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redis-server --version

How do I verify Redis is running?

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redis-cli ping

Expected response:

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PONG

Where is the Redis configuration file?

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/etc/redis/redis.conf

Where are Redis logs stored?

Typically:

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/var/log/redis/redis-server.log

You can also use:

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sudo journalctl -u redis-server

Conclusion

Congratulations! 🎉

You've successfully installed and configured Redis on Ubuntu 24.04 LTS.

Your Redis server is now ready to accelerate Magento by handling cache storage, full-page caching, and session management.

In this guide, you learned how to:

• Install Redis
• Configure Redis securely
• Optimize memory usage
• Configure persistence
• Verify the installation
• Monitor Redis
• Troubleshoot common issues
• Prepare Redis for a production Magento environment

With Redis running correctly, your Magento server is now significantly better prepared for handling traffic efficiently.

Continue the Magento Installation Series

Continue with the next guide:

• ✅ Install PHP 8.4 on Ubuntu 24.04
• ✅ Install Composer on Ubuntu 24.04
• ✅ Install MySQL 8 on Ubuntu 24.04
• ✅ Install OpenSearch on Ubuntu 24.04
• ✅ Install Redis on Ubuntu 24.04
• ➜ Install Nginx on Ubuntu 24.04
• Install Magento 2.4.8
• Configure Production Mode
• Configure Cron Jobs
• Configure File Permissions

Need Professional Magento Development?

Building or scaling a Magento store requires more than just installing software. A well-optimized environment improves speed, stability, and long-term maintainability.

Paridhi Solutions provides:

• Adobe Commerce & Magento Development
• Custom Module Development
• Third-Party API & ERP Integrations
• Performance Optimization
• Store Migration & Upgrades
• Ongoing Maintenance & Support

🌐 Website: https://paridhisolutions.com

📧 Email: info@paridhisolutions.com

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