40 Must‑Know Nginx Interview Questions to Ace Your Backend Interview
This article compiles a curated list of 40 high‑frequency Nginx interview questions covering fundamentals, configuration, performance tuning, security, high‑availability, load‑balancing strategies, and practical troubleshooting to help backend engineers prepare effectively for technical interviews.
Nginx is a core component of modern web architecture and a frequent topic in backend engineering interviews. To help candidates master the essential concepts and practical details, this article presents a curated collection of 40 high‑frequency Nginx interview questions that span basic definitions, configuration nuances, performance optimization, security considerations, high‑availability setups, load‑balancing algorithms, and related operational scenarios.
The questions are listed below:
Explain what Nginx is.
List some features of Nginx.
List the differences between Nginx and Apache.
Explain how Nginx processes HTTP requests.
In Nginx, how do you use an undefined server name to block request handling?
What are the advantages of using a reverse proxy server?
List the best use cases for an Nginx server.
Explain the roles of the master and worker processes in Nginx.
How do you start Nginx on a port other than 80?
Is it possible to replace Nginx errors with a 502 or 503 error?
In Nginx, explain how to preserve double slashes in a URL.
What is the purpose of the ngx_http_upstream_module?
Explain what the C10K problem is.
State the functions of the stub_status and sub_filter directives.
Does Nginx support compressing requests to upstream?
Explain how to obtain the current time in Nginx.
What is the purpose of the -s option in the Nginx command?
Explain how to add a module to the Nginx server.
Why use Nginx?
Why is Nginx performance so high?
How does Nginx handle requests?
What are forward proxy and reverse proxy?
What are the advantages of using a reverse proxy server?
What are the advantages and disadvantages of Nginx?
What are the application scenarios of Nginx?
What is the directory structure of Nginx?
Which modules and directives are defined in the nginx.conf configuration file?
How does Nginx serve static resources?
How to solve front‑end cross‑origin issues with Nginx?
How to configure virtual hosts in Nginx?
What is the purpose of the location block?
How to implement rate limiting?
Do you know the leaky bucket and token bucket algorithms?
Why perform static‑dynamic separation?
How does Nginx achieve static‑dynamic separation?
How are load‑balancing algorithms implemented in Nginx and what strategies are available?
How to configure high availability for Nginx?
How does Nginx determine that an IP is inaccessible?
How to restrict browser access?
What is the Rewrite global variable?
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