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1️⃣ System Access & Login Issues (10) 1. Cannot SSH into server Check ping server-ip ssh user@server-ip systemctl status ssh Possible issues • SSH service down • Security group blocking port 22 • Fir
50 DevOps Linux Interview Questions (With Answers) 1 What is Linux? Answer:Linux is an open-source Unix-like operating system used in servers, cloud systems, and DevOps environments. 2 What is root d
1️⃣1️⃣ File Searching Commands Linux systems can contain millions of files, so efficient search tools are essential. find — Search Files in the Filesystem What find does find searches for files and d
7️⃣ Service Management (systemd) Most modern Linux systems use systemd to manage background services. Services run continuously in the background such as: nginx docker mysql redis kubernetes services
Networking troubleshooting is a core skill for DevOps engineers, because most production issues involve connectivity problems between services — such as: Application cannot reach database API is not
1️⃣ grep — Search Text in Files What grep does grep searches for specific words or patterns inside files. Syntax: grep "pattern" file Example: grep ERROR app.log Output: [ERROR] Database connection
3️⃣ Process Management A process is a running program. Example: nginx docker mysql ps Shows running processes. ps aux Meaning: Option Meaning a all users u detailed format x background pr
🧠 What is Process Priority in Linux? The CPU cannot run all processes at the same time. So Linux uses a scheduler that decides which process gets CPU first. Each process has a priority value called t
1️⃣ /etc — System Configuration Files What it contains /etc stores system-wide configuration files. These files control how services, applications, and the OS behave. Important files inside /etc