Apache, also known as the Apache HTTP web server, is the most popular open-source web server for hosting websites. It was initially developed by Robert McCool and the Apache Software Foundation in 1995.
Now, if you are looking for a job related to Apache, you must prepare for the 2026 Apache Interview Questions. Every interview is indeed different depending on the job profile. Here, we have prepared the critical Apache Interview Questions and Answers to help you succeed in your interview.
This article on 2026 Apache Interview Questions presents the 26 most essential and frequently asked Apache interview questions. These interview questions are divided into two parts as follows:
Apache Interview Questions (Basic)
This first part covers basic Apache Interview Questions and Answers.
Q1. What do you mean by Apache Web Server?
Answer:
Apache Web Server is a free and open-source web server that delivers websites and web applications to users through the internet. It accepts requests from web browsers, processes them, and returns the required web pages or files. Apache supports multiple operating systems, secure connections, virtual hosting, and customizable modules, making it a flexible and dependable choice for web hosting.
Q2. How to check the Apache version?
Answer:
To check the installed Apache version, open a terminal or command prompt and run the httpd -v command. It displays the Apache HTTP Server version, release details, and build information available on your system. If your operating system uses the apache2 executable instead of httpd, run apache2 -v to view the same information.
Q3. Does Apache run as which users, and how to check the location of the config file?
Answer:
Apache runs as the nobody user, and the configuration file’s located at/etc/httpd/conf/httpd.conf.
Let us move on to the next set of Apache Interview Questions.
Q4. What are the ports of HTTP and HTTPS for Apache?
Answer:
In Apache, HTTP typically runs on port 80, while HTTPS uses port 443 by default. Port 80 delivers standard web traffic without encryption. Port 443 uses SSL/TLS encryption, making it the preferred choice for websites that handle sensitive information, such as login credentials, financial transactions, and personal user data.
Q5. How will you install the Apache server on Linux Machine?
Answer:
This is a common Apache interview question. We can give the following commands for CentOS and Debian, respectively:
CentOS: yum install httpd
Debian: apt-get install apache2
Q6. Where are the configuration directories of the Apache web server?
Answer:
You can use the following command: cd /etc/HTTP and type ls -l
Q7. Can we install two Apache web servers on one single machine?
Answer:
Yes, we can install two Apache web servers on a single machine, but we have to use two different ports.
Q8. What does Document Root refer to in Apache?
Answer:
It means the web file location, which is stored on the server. For Eg: /var/www.
Q9. What do you mean by the Alias Directive?
Answer:
The alias directive is responsible for mapping resources in the file system.
Q10. What do you mean by Directory Index?
Answer:
It is the first file that the Apache server looks for when any request comes from a domain.
Q11. What do you mean by the log files of the Apache web server?
Answer:
We can access the Apache server’s log files at/var/log/httpd/access_log and /var/log/httpd/error_log.
Q12. What do you mean by a virtual host in Apache?
Answer:
The virtual host section contains information regarding your Website name, Directory Index, Server Admin and Email, and information on error logs.
Q13. Explain the difference between location and Directory.
Answer:
For setting the element related to the URL, we use Location.
It refers to the server’s file system location: Directory.
Apache Interview Questions (Advanced)
Let us now look at the advanced Apache Interview Questions and Answers.
Q14. What do you mean by Apache Virtual Hosting?
Answer:
Hosting multiple websites on a single web server is known as Apache Virtual Hosting. There are two types of virtual hosting: Name-Based Virtual Hosting and IP-Based Virtual Hosting.
Q15. What do you mean by MPM in Apache?
Answer:
In Apache, MPM stands for Multi-Processing Modules.
Q16. What do you mean by mod_perl and mod_php?
Answer:
mod_perl is used for enhancing the performance of Perl scripts.
mod_php is used for enhancing the performance of PHP scripts.
Q17. What do you mean by Mod_evasive?
Answer:
The module helps the web server prevent web attacks, e.g., DDOS.
Q18. What do you mean by Loglevel debug in the httpd. conf file?
Answer:
With loglevel debug, we can find more information in the error logs to help solve the problem.
Q19. How to start and stop the Apache Web server?
Answer:
This is the most famous Apache interview question. Inside the Apache instance location is a bin folder, and inside the bin folder, there will be an executable script. We can use the command below in the bin folder via the terminal:
For a start: ./apachectl start
For a stop: ./apachectl stop
Q20. What is the command to change the default listen port?
Answer:
We can give a command like this: Listen 9.126.8.139:8000. This command will change the default listen port and set the listening port to 8000.
Q21. What is the name of the WebLogic module?
Answer:
The WebLogic module name is so.
Q22. What is the log level of Apache?
Answer:
The log levels are: debug, info, warn, notice, crit, alarm, emerg, and error.
Q23. How will you kill the Apache process?
Answer:
We can use the command below:
Kill $PIDNUMBER
Q24. What do you mean by these error codes: 200, 403, and 503?
Answer:
200 – The server is ok.
403 – The server is trying to access a restricted file.
503 –The server is busy.
Q25. How will you check the httpd. conf consistency?
Answer:
By giving the below command:
httpd -t
Q26. How will you enable the PHP scripts on the server?
Answer:
We have to follow the steps :
First, install mod_php.
Second, run the command: AddHandler application/x-httpd-PHP .phtml .php
Conclusion
These are essential Apache Interview Questions and Answers related to the Apache interview. To clear the interview, practice more about commands and basics. Significantly how to change the settings and questions related to the httpd.conf file.
Recommended Articles
This has been a guide to the list of Apache Interview Questions and Answers. In this post, we have studied top Apache Interview Questions that are often asked in interviews, so candidates can crack them easily. You may also look at the following articles to learn more –
