2025 Linux Cloud Computing Interview Questions: 142 Essential Q&A

Linux Cloud Computing Interview Questions (2025 Edition)

Compiled a comprehensive set of Linux cloud computing interview questions that cover fundamentals, system architecture, security, shell scripting, networking, load balancing, and common administration tasks.

1. Linux Overview

What is Linux?

Differences between Unix and Linux?

What is the Linux kernel?

Basic components of Linux?

Linux architecture?

Difference between BASH and DOS?

Linux boot process?

Default runlevels?

Inter‑process communication methods?

System log files?

Is installing multiple desktop environments helpful?

What is swap space?

What is the root account?

What is LILO?

What is BASH?

What is CL1?

What is GU1?

Advantages of open source?

Importance of the GNU project?

2. Disk, Directory, File

Simple Linux file system?

Linux directory structure?

What is an inode?

Hard links vs soft links?

What is RAID?

3. Security

Post‑initialization security tasks?

What are CC attacks and DDoS attacks?

What is database injection?

4. Shell

What is a shell script?

Syntax basics?

5. Additional 142 Questions (selected examples)

Disk usage detection with shell script

LVS load‑balancing strategies

Understanding LVS architecture

Principles of load balancing

Components of LVS

Related LVS terminology

LVS‑NAT principle and features

LVS‑DR principle and features

Comparison of LVS modes

LVS scheduling algorithms

Differences between LVS and Nginx

Purpose of load balancing

How keepalived works and VRRP protocol

Resolving keepalived split‑brain issues

Monitoring split‑brain with Zabbix

Nginx load‑balancing strategies and modules

Difference between reverse and forward proxy

Squid, Varnish, Nginx differences

How Nginx handles HTTP requests

Nginx virtual host concepts

Health‑check implementation in Nginx

Apache Worker vs Prefork

Tomcat default ports and modifications

Tomcat work mode and request flow

Monitoring Tomcat memory usage

Optimizations for Nginx and Tomcat

Session synchronization issues in Nginx

Common Nginx status codes

Website access flow, three‑way handshake, four‑way termination

Static vs dynamic resources

Maximum concurrency supported by worker

Differences between Tomcat and Resin

What is gray‑scale release?

Analyzing Nginx access logs for top IPs

Version differences of Nginx

Latest Nginx version

6. Additional 58 Practical Linux Commands

Common Linux distributions

View logs for a specific time range

Replace all occurrences of a string in a file

Replace text between line n and m

Count occurrences of a string

Find lines containing a pattern

Search log.txt for keyword abc and count matches

How to view Java processes

List listening ports

Find process using port 8080

Check disk usage and directory sizes

Recursively change ownership of a directory

Change only owner or only group

Set permissions: owner read, group write, others execute

List all users and groups

Add a user and set password

Show currently logged‑in user

These questions and commands are gathered from various online sources to help candidates prepare for Linux cloud computing interviews.