Master Nginx: From Basics to Advanced Configuration and Optimization

Nginx Basics

Nginx is an open‑source, high‑performance HTTP server, reverse proxy, mail proxy and TCP/UDP proxy. It uses a multi‑process architecture consisting of a master process and multiple worker processes.

Master Process Functions

Read and validate configuration files.

Create, bind and close socket connections.

Manage worker processes according to the configuration.

Accept external commands such as restart, upgrade, or shutdown.

Perform seamless upgrades without interrupting service.

Open log files and obtain file descriptors.

Handle rollback on upgrade failure.

Compile and execute embedded Perl scripts.

Worker Process Functions

Accept and process client requests.

Dispatch requests to appropriate modules for handling.

Perform I/O operations to retrieve response data.

Communicate with upstream servers and receive their responses.

Cache data and query cache indexes.

Send the final response back to the client.

Receive commands from the master process such as restart or shutdown.

Core Configuration Details

Virtual hosts are defined by IP, port, and optional domain name, relying on the ngx_http_core_module. The location directive controls request routing, and the try_files directive checks file existence in order, performing an internal redirect to the first existing file.

Four‑Layer Access Control

Access control is implemented via the ngx_http_access_module, allowing restriction based on client IP address.

HTTPS and Security

HTTPS combines HTTP with SSL/TLS to encrypt data, protecting sensitive information during transmission. It is widely used in banking, email, and other high‑security services.

Reverse Proxy

A reverse proxy forwards external client requests to internal web servers and returns the responses to the client. This architecture is common for load balancing and security.

Production Deployment

Typical production setups place Nginx in front of application servers, handling SSL termination, static content, and request routing.