What Are Some Ruby Web Server Options?


Scott Campbell

Ruby is a versatile programming language that is widely used for web development. When it comes to deploying Ruby applications, there are several web server options available. In this article, we will explore some of the popular choices and discuss their features and use cases.

1. WEBrick

WEBrick is a lightweight web server that comes bundled with Ruby.

It is easy to set up and provides basic functionality for serving static files and handling HTTP requests. While WEBrick is not suitable for production environments with high traffic, it can be useful for local development and testing purposes.

2. Unicorn

Unicorn is a high-performance HTTP server for Rack applications.

It supports multiple worker processes, allowing efficient handling of concurrent requests. Unicorn is known for its stability and scalability, making it a popular choice among Ruby developers for production deployments.

Key Features:

  • Process Forking: Unicorn uses a master-worker process model, where the master process forks multiple worker processes to handle incoming requests.
  • Load Balancing: Unicorn can be used in conjunction with a load balancer to distribute incoming requests across multiple worker processes or servers.
  • Worker Isolation: Each worker process operates independently, ensuring that one worker’s failure does not affect the entire application.

3. Puma

Puma is another popular web server designed for running Ruby web applications.

It supports multi-threading, providing better concurrency compared to Unicorn’s process-based approach. Puma is well-suited for applications with high traffic or long-running requests.

Key Features:

  • Thread Pooling: Puma uses a pool of threads to handle incoming connections. Each thread can handle multiple requests, reducing the overhead of process creation.
  • Automatic Scaling: Puma can dynamically adjust the number of threads based on the workload, ensuring optimal resource utilization.
  • Preload App: Puma supports preloading the application code, reducing the startup time and improving performance.

4. Passenger

Passenger, also known as mod_passenger or Phusion Passenger, is a versatile web server and application server for Ruby.

It can be integrated with popular web servers like Apache or Nginx to deploy Ruby applications. Passenger offers advanced features such as load balancing, process management, and automatic code reloading.

Key Features:

  • Easy Integration: Passenger can be easily integrated with existing web servers without requiring complex configuration changes.
  • Simplified Deployment: It provides a user-friendly interface for deploying Ruby applications and managing their processes.
  • Application Isolation: Passenger isolates each application, preventing conflicts between different Ruby versions or frameworks.

In conclusion, choosing the right web server for your Ruby application depends on factors like expected traffic, concurrency requirements, and deployment environment. WEBrick is suitable for local development, while Unicorn and Puma offer better performance for production deployments.

Passenger provides additional features and flexibility but requires integration with a separate web server. Consider your specific needs and evaluate these options to make an informed decision about which Ruby web server to use.

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