Linux DevOps Survival Kit: 10 Essential Commands

DevOps is 10% knowing the tools and 90% knowing how to fix things when they break. I’m currently on Day 2 of my deep dive into Linux troubleshooting for DevOps and Cloud roles. It’s one thing to run a command; it’s another to handle a high-pressure scenario when a production server is at 90% capacity. Today’s focus was on the "Surgical Skills" of a Linux Admin: Storage Triage: Finding and truncating massive logs in /var without breaking active processes. The "Kill" Logic: Understanding when to use a polite SIGTERM vs. the forceful kill -9. Automation: Writing health-check scripts to ensure services like Nginx "self-heal" if they go down. Connectivity: Systematically troubleshooting SSH failures from the security group level down to the .ssh permissions. The "shiny" tools like Kubernetes and Terraform are built on this Linux foundation. Strengthening these basics is the only way to build reliable, world-class infrastructure. One step closer to the goal. Onward! #DevOps #Linux #CloudComputing #TechLearning #CareerGrowth #Automation Abhishek Veeramalla

Level Up Your Tech Career with the Linux Shell! 🖥️ If you’re diving into DevOps, Cloud Engineering, or System Administration, mastering the Linux Shell (BASH) is your ultimate competitive advantage. It’s not just a terminal; it’s a gateway to automation and efficiency. 💡 What is BASH? Bash (Bourne Again Shell) is the command-line interface that allows you to communicate directly with your operating system, giving you more control than any GUI ever could. ⚡ Why Master the Shell? Speed: Execute complex operations faster than clicking through menus. Automation: Turn repetitive tasks into simple one-line scripts. Control: Manage servers, files, and permissions like a pro. 🛠️ Core Commands to Get Started: pwd ➔ Show current directory ls ➔ List files & folders cd ➔ Navigate through directories mkdir ➔ Create new folders rm ➔ Remove files or directories cat ➔ View file content instantly 🔥 The Bottom Line: Bash isn't just for experts; it’s an essential tool for anyone starting their tech journey. Mastering these basics is the first step toward becoming a powerhouse in the industry. Check out this quick guide I put together to help you master the terminal! 👇 #Linux #Bash #DevOps #CloudComputing #SysAdmin #TechSkills #LearningLinux #CodingCommunity #SoftwareEngineering

🚀 From Zero to 60+ Linux Commands — Since the end of March and throughout April, I focused on building a strong foundation in Linux and mastered top 10 services of AWS — from basics to advanced concepts. 🔧 Here are some of the most practical commands I worked with: 📁 File Management: ls, cd, pwd, cp, mv, rm, touch, mkdir, rmdir 🔐 Permissions & Ownership: chmod, chown, chgrp, umask 👤 User Management: useradd, usermod, userdel, passwd, whoami, id 📊 Monitoring & System Info: top, htop, ps aux, ps -ef, df -h, du -sh, free -m, uptime, dmesg, lsblk, lshw ⚙️ Service Management (Systemctl): systemctl start, systemctl stop, systemctl restart, systemctl status 📦 Archiving & Compression: tar -cvf, tar -xvf 🔍 Search & Text Processing: grep, find, locate, cat, less, head, tail, wc ❌ Process Control: kill, kill -9 💡 This journey helped me understand how Linux powers real-world systems, especially in DevOps and Cloud environments. ❓ Question for Linux/System Admins: When debugging an OOM (Out Of Memory) issue, I’ve been using grep on logs (like dmesg or /var/log/syslog) to find OOM kill messages. 👉 Is this the right approach in real-world scenarios, or are there better tools/commands you prefer? Would love to learn how it’s handled in production environments 🙌 Big Thanks to Vikas Ratnawat CloudDevOpsHub Community for mentoring. 😀 Tomorrow I will be sharing my project of Automation & shell scripting deployed on google cloud. Consistency over everything. Still learning, still building. #Linux #DevOps #CloudComputing #ShellScripting #Automation #LearningJourney #TechSkills

Linux isn’t just an operating system. It’s the foundation of modern DevOps. Behind every container, pipeline, cloud instance, or automation script there’s Linux powering it. If you're serious about DevOps, you don’t need to be a Linux kernel expert. But you must be Linux confident. ✅ Most DevOps tools run on Linux ✅ Cloud runs on Linux (AWS, Azure, GCP) ✅ Automation lives in the terminal ✅ Security starts with Linux permissions, SSH, and logs 🎯 What to focus on: • Filesystem, permissions, processes • Networking (IP, DNS, SSH, NetTools) • Shell scripting (loops, conditions, variables) • System monitoring (top, df, free, logs) • Package management (apt, yum, dnf) • Services & daemons (systemctl) • Users & sudo, chmod, chown 🔁 Reality check: The GUI won’t save you in production. The terminal will. Copy-pasting commands is not a skill --- understanding is. 🚀 Master Linux. Automate Everything. Own the Future. Drop your favorite terminal productivity trick below 👇 #Linux #DevOps #CloudComputing #SRE #Automation #ShellScripting #Kubernetes #Docker #Jenkins #Ansible #AWS #Azure #GCP #InfrastructureAsCode #CICD #SysAdmin #Terminal #CloudNative #PlatformEngineering #TechCareers #LearnDevOps

2:13 AM. Your phone rings. 🚨 “Production is down.” Users can’t log in. Revenue is dropping. Everyone is panicking. What do you do? This is where DevOps is tested. Not in tutorials. Not in courses. But in real incidents. In that moment, tools won’t save you. Your fundamentals will. ✔ Can you debug logs quickly? ✔ Do you understand Linux systems? ✔ Can you trace network issues? ✔ Can you fix it under pressure? This is what real DevOps looks like. Most engineers are not ready for this. Because they focused on tools. Not fundamentals. If you want to survive production: 👉 Learn Linux deeply 👉 Practice debugging 👉 Build real systems Because when things break… There’s no tutorial. Save this reminder. Follow for daily DevOps & Cloud content. #DevOps #SRE #Linux #CloudComputing #Production

DevOps can look very polished from the outside. • Cloud dashboards • Automated pipelines • Clean web interfaces • Seamless deployments Everything feels fast, modern, and under control 🚀 Until production breaks. And then… everything shifts back to fundamentals: • SSH into servers • Dig through /var/log • Run Linux commands to trace issues • Write quick Bash scripts to patch things up That’s when the reality becomes clear— No matter how advanced the stack is, it still runs on: • Linux • Bash • CLI tools These aren’t flashy. They don’t have dashboards. But they are the backbone of everything we build. At the end of the day, when systems fail, it’s not the UI that saves you — it’s your fundamentals. Takeaway: You can ignore Linux and Bash early on, but in real-world DevOps… the terminal is inevitable. #DevOps #Linux #Bash #CloudComputing #AWS #Automation #CloudEngineer #TechJourney

🚀 New Blog Published: Linux Networking Basics for DevOps Engineers When I started learning DevOps, one thing that confused me the most was networking. Commands were easy to memorize, but understanding how systems actually communicate was the real challenge. In real-world DevOps environments, most issues are not in the code — they are in the network. That’s why having a strong grip on Linux networking is essential for debugging, monitoring, and system reliability. In this article, I explain: ✅ Core networking commands like ip, ping, ss, curl, and dig ✅ How to check connectivity, DNS, and open ports ✅ Step-by-step troubleshooting approach used in real scenarios ✅ Easy diagrams to visualize network flow ✅ How DevOps engineers debug issues in production 📖 Read here: https://lnkd.in/eKTTZnPk 💡 If you're: • Preparing for DevOps interviews • Working with Linux servers • Tired of “it’s not working” without knowing why This will help you think like a real engineer. 🔥 One truth: You don’t debug apps… You debug the network behind them. Let me know in comments 👇 What’s the most confusing Linux networking command for you? #DevOps #Linux #Networking #Cloud #Kubernetes #Tech #Learning #Beginners #devopsjourneywithrahul #rahulshukla

There are no ways to learn Linux… Linux is the way. 🐧 When I was in college, Linux honestly never felt that important. We used it for a few labs and assignments, but at that time it always felt like “just another subject.” But things completely changed when I started working on production-grade applications and infrastructure. The moment you enter the real world of DevOps / Cloud / SRE, you realize something quickly: Almost everything runs on Linux. Servers Containers Kubernetes clusters CI/CD pipelines Networking Automation scripts That’s when it hit me: 👉 Linux is not just a tool. It’s the foundation of modern infrastructure. Today my day literally starts with Linux — checking logs, troubleshooting servers, writing automation scripts, managing containers, and debugging infra issues. And the biggest realization? You don’t really learn Linux from tutorials. You learn Linux by: • Breaking things • Fixing them • Reading logs • Understanding how the system actually works There are no ways to learn Linux. Linux itself is the way. 🐧 --- 📌 I’m also starting to share my basic Linux notes here on LinkedIn — covering important concepts, commands, and real-world understanding that helped me while working on production systems. If you're starting your journey in DevOps / Cloud / Backend, these notes might help you build a strong foundation. --- 💬 Curious to know: At what point did you realize how powerful Linux actually is? --- #Linux #DevOps #CloudComputing #Kubernetes #SRE #Infrastructure #DevOpsEngineer #LearningInPublic #TechCommunity #TechJourney #AkashFrancis #Notes

🚀 Day 12: Linux Internals for DevOps Engineers (Advanced) 👉 Disk Issues in Production (Not as simple as you think) Most people think: ❌ Disk full → delete files → done But real production issues are more complex. Today I explored how engineers actually debug disk-related failures. 📌 What I learned: 🔹 `df -h` shows disk usage 🔹 `du -sh` helps trace large directories 🔹 Sometimes deleted files still occupy space (hidden usage) 🔹 Log rotation is critical to prevent repeated failures 💡 Real Scenario: Disk shows 100% usage… But you can’t find large files. Why? 👉 Because deleted files are still held by running processes. Solution: ✔ Use `lsof | grep deleted` ✔ Restart the process This is something most beginners don’t know. 🧠 Question for you: Have you ever faced a situation where disk was full but you couldn’t find the files causing it? 👇 Would love to know your experience! 🎯 Learning Goal: To debug storage issues deeply and prevent recurring failures. 📅 Day 13 Tomorrow: Networking Basics (IP, Ports, DNS) Let’s keep going deeper 🚀 #DevOps #Linux #SRE #Storage #CloudComputing #SoftwareEngineering #TechLearning #LearningInPublic #ITCareers #EngineeringMindset #CareerGrowth #ProductionIssues

Linux Part 2 — the commands that actually fix things. Part 1 was about reading and understanding your system. Finding the problem. But finding the problem is only half the job. You still need to fix it. Here's the action layer — the commands that let you take control: Managing services: → systemctl status nginx — is this service running? → systemctl restart nginx — restart it → systemctl stop nginx — stop it completely → systemctl enable nginx — auto start on reboot Fixing permissions: → chmod 755 filename — set read, write, execute access → chown user:group filename — change who owns the file Stopping problem processes: → ps aux | grep processname — find the exact process → kill -9 PID — force stop it Running as admin: → sudo command — elevated access when you need it Editing files on the server: → nano filename — simple and beginner friendly → vi filename — powerful, worth learning properly Here's the simple way to think about it: Part 1 commands = read the system → find the problem Part 2 commands = take action → fix the problem You need both. Knowing what's wrong but not being able to fix it is just frustrating. 😅 Which command from this list do you use the most? 👇 #DevOps #Linux #BeginnerDevOps #LearningDevOps #CloudNative #SysAdmin #TechCareers #LearningInPublic #Azure #AWS #GCP