Best Open Source Web Servers for Linux

Linux offers several open source web server software to choose from for hosting websites and web applications. The most popular ones are Nginx, Apache HTTP Server, Apache Tomcat, Lighttpd and many others. This article provides an in-depth comparison and guide to help you pick the right web server for your needs.

Nginx

Nginx (pronounced "engine-x") is a high performance web server known for its speed, stability, rich feature set, simple configuration and low resource utilization. Some key features include:

• High concurrency – can handle over 10,000 connections per server block
• Load balancing and reverse proxy capabilities
• Supports HTTP/2, HTTP/3 protocols for better performance
• Shared memory caching for fast serving of static content
• Can be used as mail proxy and reverse proxy server

Here are the steps to install Nginx on Ubuntu:

sudo apt update
sudo apt install nginx

To verify installation:

nginx -v

Some performance tuning settings for Nginx include:

• Enable gzip compression
• Set worker processes based on cores
• Tune worker connections as per traffic
• Cache static assets
• Enable Keepalive for persistent connections

Overall, Nginx is known for having a small memory footprint, high concurrency, stability and flexibility via its module ecosystem. It‘s well suited for high traffic websites, load balancing, API services and running alongside other servers like PHP/Python/Nodejs backends.

Apache HTTP Server

The Apache HTTP server is one of the most popular web servers used today. It‘s free, open source and very feature rich. Some benefits include:

• Supports a wide range of technologies – PHP, Python, databases, etc
• Extensive capabilities via hundreds of modules
• Runs on all major OS like Linux, Windows, macOS
• Handles over 2 billion active websites
• Very customizable and flexible configuration

To install Apache on Ubuntu:

sudo apt update
sudo apt install apache2

Verify by checking version:

apache2 -v

Some ways to optimize Apache performance include:

• Enable compression for static assets
• Increase server limits for simultaneous connections
• Use caching for improved response times
• Tweak process/thread settings based on server resources and traffic load
• Fine tune parameters in mpm_prefork/mpm_worker modules

In summary, Apache HTTP server is a full-featured, battle tested, reliable web server with enterprise-grade capabilities to handle any kind of workload. It has a very vibrant community behind it and rich ecosystem of custom modules and plugins.

Apache Tomcat

Apache Tomcat is a popular open source servlet container for hosting Java based web applications built on top of Servlet and JSP technologies. Some benefits include:

• Implements Java Servlet and JSP specifications
• Integrates with databases like MySQL, PostgreSQL etc
• Cross platform – runs on Linux, Windows and macOS
• High performance for hosting Java web apps
• Actively maintained and updated releases

Below are the steps for installing Tomcat 9 on Ubuntu:

sudo apt update  
sudo apt install default-jdk
wget https://dlcdn.apache.org/tomcat/tomcat-9/v9.0.71/bin/apache-tomcat-9.0.71.tar.gz
sudo tar -xvzf apache-tomcat-9.0.71.tar.gz -C /opt
sudo ln -s /opt/apache-tomcat-9.0.71 /opt/tomcat

Some Tomcat optimizations include:

• Tune JVM heap size settings
• Enable compression
• Load balance across multiple Tomcat instances
• Cache frequently accessed data/metadata
• Use connection pooling for backend database access

Tomcat is a great choice for Java centric applications and platforms needing advanced Java/J2EE capabilities. It can be deployed as stand-alone server or easily integrated with Apache HTTP Server and Nginx via mod_jk or mod_proxy plugins.

Comparison Between Servers

Feature	Nginx	Apache	Tomcat
Programming language	C	C	Java
Workload	Static & dynamic content, reverse proxy	All workloads	Java web apps
Performance	Very high – over 10K conn/server	Moderate – depends on config	High
Scalability & concurrency	Excellent – event driven	Good – process based	Very good
Flexibility & customization	Module ecosystem	Hundreds of modules, Very high	Limited
Resources utilization	Low memory & CPU footprint	Higher resource usage	Depends on JVM sizing

So in summary:

• Nginx – Great at serving static content fast, scaling well under load and balancing traffic
• Apache – Jack of all trades, excellent all-rounder with vast capabilities
• Tomcat – Good fit for hosting Java heavy sites and web apps

The best web server depends on your specific use case and traffic loads. A common pattern is running Nginx in front of Apache/Tomcat servers to offload static content serving while passing dynamic requests to them. This provides the best of all worlds.

Conclusion

There are several open source web/application server technologies to pick from on Linux like Nginx, Apache HTTP server and Tomcat. They cater to varied use cases for hosting different kinds of workloads. This blog post covered their features, performance and scenarios where each one fits best. Make sure to tune these servers based on your infrastructure and actually test them under production-like traffic to pick the right technology.