Top 100+ Nginx Interview Questions And Answers
Question 1. What Is Nginx Server?
Answer :
Nginx is an open supply web server and a opposite proxy server for HTTP,SMTP, POP3, and IMAP protocols with a robust attention on excessive concurrency,performance and low reminiscence utilization. It is stated as “engine x”.
Question 2. Who Is Author Of Nginx?
Answer :
Igor Sysoev
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Question 3. In Which Language Nginx Is Written?
Answer :
‘C’ Language.
Question 4. What Is Official Website Of Nginx?
Answer :
nginx.Org
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Question five. When Nginx’s Stable Version Launched?
Answer :
five August 2014
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Question 6. What Is The Best Usage Of Nginx Server?
Answer :
Nginx can installation dynamic HTTP content on a network with using of SCGI,FastCGI handlers for scripts, WSGI application servers or Phusion Passenger module. Nginx also can serve as a load balancer.
Question 7. What Is The Difference Between Apache Web Server And Nginx?
Answer :
Nginx uses an asynchronous occasion technique to managing a couple of requests whereas Apache Web Server use the synchronous. Nginx’s eventpushed method can provide more predictable overall performance under excessive loads.
Apache Web Server managing more than one
Nginx dealing with more than one—–B———–way, Nginx is a ways higher than Apache.
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Question eight. What Are Features Of Nginx?
Answer :
Simultaneous Connections with low reminiscence
Auto Indexing
Load Balancing
Reverse Proxy with Caching
Fault Tolerance
Question nine. What Are All Feature Of Nginx Server?
Answer :
Ability to address greater than 10,000 simultaneous connections with a low memory.
Handling of static documents, index files, and carindexing
Reverse proxy with caching
Load balancing with inband fitness checks
Fault tolerance
TLS/SSL with SNI and OCSP stapling assist, thru OpenSSL.
FastCGI, SCGI, uWSGI assist with caching
FastCGI thru PHP (PHPFPM) support with caching
Name and IP cope withbased virtual servers
IPv6well matched
SPDY protocol aid
WebSockets and HTTP/1.1 Upgrade (one hundred and one Switching Protocols)
FLV and MP4 streaming
Web web page get right of entry to authentication
gzip compression and decompression
URL rewriting
Custom logging with onthefly gzip compression
Response rate and concurrent requests limiting
Server Side Includes
IP deal withbased GeoLocation
User monitoring
WebDAV
XSLT facts processing
Embedded Perl scripting
TLS/SSL guide
STARTTLS assist
SMTP, POP3, and IMAP proxy
Authentication the use of an external HTTP server
Upgrading executable and configuration with out consumer connections loss and a modulebased structure.
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Question 10. Explain How You Can Start Nginx Through A Different Port Other Than eighty?
Answer :
To start Nginx through a unique port, you have to visit /and many others/Nginx/sitesenabled/ and if that is the default report, then you need to open document known as “default.” Edit the report and put the port you need
Like server listen eighty one?
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Question eleven. Where The Process Id Does For Nginx Server?
Answer :
The manner ID of the master procedure is written inside the file /usr/neighborhood quit 13. What Is The Purpose Of –s With Nginx Server?
Answer :
-s parameter is used to run the executable document of nginx.
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Question 14. How To Add Modules In Nginx Server?
Answer :
Nginx modules should be selected throughout collect.
Runtime selection of modules is not supported by using Nginx.
Question 15. What Is The Advantage Of Using A “reverse Proxy Server”?
Answer :
The reverse proxy server can cover the presence and traits of the beginning server. It acts as an intermediate among internet cloud and internet server. It is ideal for safety cause specially while you are using internet hosting services.
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Question sixteen. Mention What Is The Best Usage Of Nginx Server?
Answer :
The quality usage of Nginx server is to install dynamic HTTP content material on a network with the usage of SCGI, WSGI utility servers, FastCGI handlers for scripts. It also can function a load balancer.
Question 17. What Is The Master And Worker Processes In Nginx Server?
Answer :
Worker approaches: It reads and compare configuration and preserve worker processes.
Master approaches: It absolutely does the processing of the requests.
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Question 18. Explain Is It Possible To Replace Nginx Errors Like 502 Error With 503?
Answer :
502= Bad gateway
503= Server overloaded
Yes, it's far viable but you to make sure that fastcgi_intercept_errors is about to ON, and use the mistake page directive.
Location /
fastcgi_pass 127.Zero.01:9001?
fastcgi_intercept_errors on?
error_page 502 =503/error_page.Html?
#…
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Question 19. In Nginx, Explain How You Can Keep Double Slashes In Urls?
Answer :
To preserve double slashes in URLs you have to use merge_slashes_off?
Syntax: merge_slashes [on/off]
Default: merge_slashes on
Context: http, server
Question 20. What Is Ngx_http_upstream_module Is Used For?
Answer :
The ngx_http_upstream_module is used to define corporations of servers which could reference through the fastcgi skip, proxy skip, uwsgi bypass, memcached pass and scgi pass directives.
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Question 21. What Is C10k Problem?
Answer :
C10K problem is referred for the network socket unable to handle a big range of client (10,000) at the identical time.
Question 22. What Is The Use Of Stub_status And Sub_filter Directives?
Answer :
Stub_status directive: This directive is used to understand the modern-day fame of Nginx like contemporary lively connection, total connection well-known and treated current variety of read/write/wait connection
Sub_filter directive: It is used to search and replace the content material in reaction, and brief restore for stale data
Question 23. Explain Does Nginx Support Compress The Request To The Upstream?
Answer :
You can compress the request to the upstream by way of the use of the Nginx module gunzip. The gunzip module is a filter that decompresses responses with “Content Encoding: gzip” for customers or servers that don't guide “gzip” encoding technique.
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Question 24. Explain How You Can Get The Current Time In Nginx?
Answer :
To get the cutting-edge time in Nginx, you need to use variables from SSI module, $date_gmt and $date_local.
Proxy_set_header THETIME $date_gmt?
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Question 25. Explain How To Add Modules In Nginx Server?
Answer :
During the compilation method, Nginx modules must be selected as such runtime selection of modules isn't always supported with the aid of Nginx.
Question 26. Explain How Nginx Can Handle Http Requests?
Answer :
Nginx makes use of the reactor sample. The important occasion loop waits for the OS to sign a readiness event such that the information is out there to read from a socket, at which example it's miles study into the buffer and processed. A Single thread can serve tens of lots of simultaneous connections.
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Question 27. In Nginx How You Can Prevent Processing Requests With Undefined Server Names?
Answer :
A server that simply drops the requests can be defined as Server
concentrate eighty?
server_name “ “ ?
go back 444?
Here the server call is kept as an empty string which will fit request without the “Host” header field, and a unique Nginx’s nonwellknown code 444 is returned that terminates the relationship.
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Question 28. Define Some Special Features Of Nginx?
Answer :
Special features of the Nginx server includes :
Reverse proxy/ L7 Load Balancer
Embedded Perl interpreter
On the fly binary improve
Useful for rewriting URLs and excellent PCRE aid
Question 29. What Is The Difference Between Nginx And Apache?
Answer :
Nginx :
Nginx is an occasion primarily based web server
All request are dealt with by means of a unmarried thread.
Nginx avoids infant processes concept.
Nginx resembles velocity
Nginx is better in terms of memory intake and connection
Nginx is higher while you need load-balancing
For PHP, Nginx might be leading as it helps PHP internally
Nginx do no longer aid O.S like IBMi and OpenVMS.
Nginx comes simplest with middle capabilities
Nginx overall performance and scalability do not rely upon hardware
Apache:
Apache is a method based server
Single thread handles a single request.
Apache is based totally on child processes
Apache resemble strength
Apache isn't always up-to the mark in terms of reminiscence intake and connection
Apache will refuse new connections while site visitors reaches the limit of techniques
Apache help’s PHP, Python, Perl and other languages the usage of plugins. It is beneficial while application is based totally on Python or Ruby
Apache guide an awful lot wider range of O.S
Apache offers lot more functionality than Nginx
Apache is dependent on hardware components like CPU and memory
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Question 30. How To Reopening The Log Files In Nginx Server?
Answer :
You can use nginx –s reopen
Question 31. How To Reload Configuration File Of Nginx Server?
Answer :
You can reload Nginx configuration record by way of jogging this command: nginx -s reload
