Nginx Configuration Guide

This guide provides a comprehensive overview of configuring Nginx, a powerful web server and reverse proxy commonly used for serving high-traffic websites.

It covers topics such as server configurations, SSL/TLS setup, load balancing, caching, and performance optimization.

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Frequently Asked Questions (FAQ)

Use the `upstream` block to define backend servers, choose a balancing method like round-robin (the default), least_conn (minimum connections), ip_hash (sticky sessions), or hash (custom key). Configure health checks, weights for prioritization, and backup servers for failover.

Utilize keepalive to reduce overhead, configure timeouts and retry logic. For example: `upstream app { least_conn; server app1:3000; server app2:3000; }`

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Use limit_req_zone for Rate Limiting, limit_conn_zone for...

Configure `worker_processes` to auto, increase `worker_connections`, enable `sendfile` and `tcp_nopush`, configure keepalive, enable gzip compression, configure caching, use HTTP/2, optimize SSL (TLS 1.3, OCSP stapling), configure open_file_cache for static files, utilize access_log buffering, monitor and adjust based on metrics.

Use `nginx -t` to verify the configuration. Create separate server blocks for each domain in `/etc/nginx/sites-available/`, use symbolic links in `/etc/nginx/sites-enabled/`, use `server_name` for domain differentiation, configure individual root directories, use includes for shared configurations, configure separate access/error logs, and use `default_server` for catch-all.

Frequently asked questions

What is the purpose of setting up `apache2-utils` (htpasswd)?

Setting up `apache2-utils` (htpasswd) allows you to create a password file for basic authentication. This involves creating the file using `htpasswd -c /etc/nginx/.htpasswd username`, adding `auth_basic` and `auth_basic_user_file` within the location block, securing the password file with permissions (`chmod 600`), and utilizing it for admin panels or staging environments.

How do I use the `limit_req_zone` for rate limiting?

You define zones within `limit_req_zone`, apply rate limits using `limit_req`, configure burst for short spikes, disable nodelay for immediate processing, utilize different zones for various locations, and set a status code for rate limit exceeded (429). For example: `limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s; location /api { limit_req zone=api burst=20 nodelay; }`

How do I utilize `return` for redirects (301, 302)?

You use `return` for redirects (301, 302), `rewrite` for URL rewriting, and `try_files` for fallback mechanisms. `return` is faster for simple redirects, while `rewrite` provides more complex transformations. Examples: `return 301 https://$host$request_uri; rewrite ^/old/(.*)$ /new/$1 permanent; try_files $uri $uri/ /index.html;`, and use regular expressions cautiously due to performance impact.

How should I configure access_log and error_log with different settings?

Configure access_log and error_log with varying levels, create custom log formats (e.g., JSON), use log rotation (logrotate), integrate with ELK stack or Splunk, utilize nginx_status for metrics, monitor via Prometheus nginx_exporter, configure real-time monitoring, and leverage geoip module for location logging. Configure structured logging (JSON) for easy parsing. For example: `log_format json '{"time":"$time_iso8601","remote_addr":"$remote_addr","request":"$request","status":$status}'`

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