Master Nginx: From Basics to Advanced Configuration and Optimization

This article aims to help readers quickly master Nginx core knowledge, covering basics, detailed core configuration, advanced settings, reverse‑proxy functions, and system parameter optimization.

Nginx Basics

Nginx is an open‑source, high‑performance HTTP server, reverse proxy, mail proxy, and TCP/UDP proxy. It follows a multi‑process model composed of a master process and worker processes.

Master Process Functions

Read and validate Nginx configuration files.

Create, bind, and close socket connections.

Manage, start, and stop worker processes according to the configuration.

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

Perform graceful upgrades without service interruption.

Open log files and obtain file descriptors.

Handle upgrade failures with rollback.

Compile and execute Perl scripts.

Worker Process Functions

Accept and process client requests.

Dispatch requests to appropriate functional modules.

Perform I/O operations to retrieve response data.

Communicate with backend servers and receive processing results.

Cache data, access cache indexes, and query cached content.

Send response results back to clients.

Receive commands from the master process such as restart, upgrade, or exit.

Core Configuration Details

Virtual hosts are created based on different IPs, ports, or domain names, relying on the core module ngx_http_core_module. The location directive is used to define request handling rules.

Four‑Layer Access Control

Access control is implemented via the ngx_http_access_module, allowing restriction of client IP addresses.

File Existence Detection

The try_files directive checks for the existence of files in order, returning the first found file or directory. If none are found, an internal redirect to the last parameter occurs; the final parameter must exist to avoid a 500 error.

Advanced Configuration

HTTPS encrypts data transmission using SSL/TLS on top of HTTP, ensuring secure communication for high‑security services such as banking or email.

Reverse Proxy

A reverse proxy forwards external client requests to internal web servers and returns the responses. This is a common deployment pattern.

Production Deployment Structure

Typical production environments use Nginx as a front‑end load balancer and reverse proxy, directing traffic to application servers.

File Display

Nginx can be configured to display directory listings and file contents.