2025 Linux Cloud Computing Interview Questions + Free Resume Course

Linux Overview (11 questions)

What is Linux?

What are the differences between Unix and Linux?

What is the Linux kernel?

What are the basic components of Linux?

What is the Linux architecture?

What are the basic differences between BASH and DOS?

What is the Linux boot process?

What are the default runlevels in Linux?

What inter‑process communication methods does Linux use?

Which system log files exist in Linux?

Is installing multiple desktop environments on Linux helpful?

Disk, Directory, File (5 questions)

Simple Linux file system?

What is the Linux directory structure?

What is an inode?

What are hard links and soft links?

What is RAID?

Security (3 questions)

What security tasks should be performed after initializing a Linux system?

What are CC attacks and DDOS attacks?

What is a website database injection?

Shell (2 questions)

What is a shell script?

What are the syntax levels?

LVS and Nginx Load Balancing (42 questions)

Disk usage detection (shell script)

What strategies does LVS load balancing provide?

Explain your understanding of LVS.

What is the principle of load balancing?

What are the two components of LVS?

What terminology is related to LVS?

Principle of LVS‑NAT mode

Features of the LVS‑NAT model

Principle of LVS‑DR mode

Features of the LVS‑DR model

Comparison of three LVS load‑balancing modes

LVS scheduling algorithms

Differences between LVS and Nginx

Functions of load balancing

Nginx load‑balancing distribution strategies

What is keepalived?

How do you understand the VRRP protocol?

Principle of keepalived

Causes of keepalived split‑brain

How to solve keepalived split‑brain issues?

How does Zabbix monitor split‑brain?

What load‑balancing strategies does Nginx implement?

What modules does Nginx use for load balancing?

What are the implementation methods of load balancing?

How does Nginx achieve layer‑4 load balancing?

What web services do you know?

Why use Nginx?

Why is Nginx performance higher than Apache?

Components of epoll

Differences between Nginx and Apache

Advantages and disadvantages of Tomcat as a web server

Ports used by Tomcat and their purposes

Differences between FastCGI and CGI

Common Nginx commands

What is a reverse proxy vs a forward proxy?

Differences among Squid, Varnish, and Nginx

How does Nginx handle HTTP requests?

What virtual host options does Nginx provide?

How does Nginx perform backend health checks?

Differences between Apache Worker and Prefork

Default port of Tomcat and how to change it

Tomcat working mode

Request flow in Tomcat

How to monitor Tomcat memory usage?

Optimizations you have done for Nginx

Optimizations you have done for Tomcat

How to handle Nginx session desynchronization?

Common Nginx modules

Common Nginx status codes

Additional Linux Interview Questions (58 questions)

Common Linux distributions

How to view logs for a specific time range

Replace all occurrences of a string in a file

Replace a range of lines in a file

Count occurrences of a string in a file

Find lines containing a specific pattern

Search log.txt for a keyword and count matches

How to view Java processes

How to list listening ports on the server

How to find the process using port 8080

How to view disk usage and directory usage

Recursively change ownership and group of a directory

Change only file owner or only file group

Set file permissions: owner read, group write, others execute

List all system users and groups

Add a user and change its password

View the currently logged‑in user

Practical Linux Command Questions (16 items)

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