Linux Troubleshooting Essentials for SRE & DevOps Engineers

Shell Scripting is not optional for DevOps & Linux Engineers — it's the foundation everything else is built on. Whether you're automating deployments, managing servers, or writing CI/CD pipelines — shell scripting is the language that ties it all together. Why shell scripting matters. 1) Automation Automate repetitive tasks — backups, deployments, log rotation — saving hours daily. 2)CI/CD Pipelines Every Jenkins, GitHub Actions, or GitLab job runs shell scripts at its core. 3) Server Management Manage users, permissions, services, and system health without a GUI. 4) Debugging & Logs Parse logs, monitor processes, and diagnose issues in real time. Essential shell commands every DevOps engineer should know. 👇 Start with one small script today — automate something you do manually. That's how every great DevOps engineer began. Drop a ❤️ if this was useful! #DevOps #Linux #ShellScripting #AWS #Kubernetes #Cloud #SRE

Most people use Linux commands. Very few actually understand them. Here are 5 commands you should truly master: 1️⃣ grep Search text inside files 👉 Used for logs, debugging, filtering 2️⃣ awk Process and transform text 👉 Powerful for data extraction 3️⃣ sed Edit text in files 👉 Automate replacements 4️⃣ netstat / ss Check network connections 👉 Debug server issues 5️⃣ tail -f Monitor logs in real-time 👉 Essential for troubleshooting These are not just commands. They are tools for solving real problems. If you master these, you’ll think like a DevOps engineer. Most engineers ignore this level of depth. That’s why they struggle in production. Don’t just use commands. Understand them. Save this for later. Follow for daily DevOps & Cloud content. #Linux #DevOps #CloudComputing #PlatformEngineering #CareerGrowth

🚨 “The server is down.” Every DevOps engineer’s most feared message. While practicing Linux troubleshooting, I simulated a real-world scenario: 👉 A service suddenly stopped responding. No UI. No alerts. Just a non-working system. Here’s how I approached it: 🔍 Step 1: Check system health Used "top" → CPU & memory looked normal 📡 Step 2: Check service status "systemctl status nginx" → Service was inactive 🧠 Step 3: Dig into logs Checked "/var/log/nginx/error.log" 💥 Found the issue: Port conflict — another process was already using port 80 🛠️ Step 4: Fix - Identified process → "lsof -i :80" - Killed conflicting process - Restarted nginx ✅ Service restored. --- 📌 Key Learning: In real DevOps work, 👉 It’s not about knowing commands 👉 It’s about thinking step-by-step under pressure Logs > Guessing Process > Panic --- 🚀 This is the mindset I’m building as I transition into a Cloud Support Engineer role. More real-world scenarios coming soon. #DevOps #Linux #Troubleshooting #SRE #CloudEngineer #AWS #LearningInPublic #TechCareers

🚨 Most DevOps engineers use Linux daily… But many don’t fully understand its file system — and that’s a hidden gap. If you work with: ⚙️ Kubernetes ⚙️ CI/CD pipelines ⚙️ Cloud VMs Then Linux isn’t just a tool — it’s your foundation. 📂 Linux File System (Simplified): /boot → Boot files (kernel, GRUB) /etc → System configuration /home → User files /root → Root user home /opt → Third-party apps /dev → Devices as files /var → Logs & runtime data (start here for debugging) /bin → Basic commands /sbin → Admin commands /usr → Apps & libraries /proc → Process info (real-time) /sys → Hardware interface /run → Runtime data /tmp → Temporary files 📌 Bonus: /lib, /lib64 → Libraries /mnt, /media → Mount points /srv → Service data /lost+found → Recovered files 💡 Why it matters: ✔ Faster debugging (/var/log first) ✔ Better automation ✔ Stronger security handling ✔ More confidence in production 👉 Don’t just use Linux. Master it. #DevOps #Linux #CloudComputing #Kubernetes #AWS #Azure #SRE #Infrastructure #SysAdmin #TechCareers #Programming #Containers #CICD #LearningInPublic #CareerGrowth

🚨 Most DevOps engineers use Linux daily… But many don’t fully understand its file system — and that’s a hidden gap. If you work with: ⚙️ Kubernetes ⚙️ CI/CD pipelines ⚙️ Cloud VMs Then Linux isn’t just a tool — it’s your foundation. 📂 Linux File System (Simplified): /boot → Boot files (kernel, GRUB) /etc → System configuration /home → User files /root → Root user home /opt → Third-party apps /dev → Devices as files /var → Logs & runtime data (start here for debugging) /bin → Basic commands /sbin → Admin commands /usr → Apps & libraries /proc → Process info (real-time) /sys → Hardware interface /run → Runtime data /tmp → Temporary files 📌 Bonus: /lib, /lib64 → Libraries /mnt, /media → Mount points /srv → Service data /lost+found → Recovered files 💡 Why it matters: ✔ Faster debugging (/var/log first) ✔ Better automation ✔ Stronger security handling ✔ More confidence in production 👉 Don’t just use Linux. Master it. #DevOps #Linux #CloudComputing #Kubernetes #AWS #Azure #SRE #Infrastructure #SysAdmin #TechCareers #Programming #Containers #CICD #LearningInPublic #CareerGrowth

🚨 Most DevOps engineers use Linux daily… But many don’t fully understand its file system — and that’s a hidden gap. If you work with: ⚙️ Kubernetes ⚙️ CI/CD pipelines ⚙️ Cloud VMs Then Linux isn’t just a tool — it’s your foundation. 📂 Linux File System (Simplified): /boot → Boot files (kernel, GRUB) /etc → System configuration /home → User files /root → Root user home /opt → Third-party apps /dev → Devices as files /var → Logs & runtime data (start here for debugging) /bin → Basic commands /sbin → Admin commands /usr → Apps & libraries /proc → Process info (real-time) /sys → Hardware interface /run → Runtime data /tmp → Temporary files 📌 Bonus: /lib, /lib64 → Libraries /mnt, /media → Mount points /srv → Service data /lost+found → Recovered files 💡 Why it matters: ✔ Faster debugging (/var/log first) ✔ Better automation ✔ Stronger security handling ✔ More confidence in production 👉 Don’t just use Linux. Master it. #DevOps #Linux #CloudComputing #Kubernetes #AWS #Azure #SRE #Infrastructure #SysAdmin #TechCareers #Programming #Containers #CICD #LearningInPublic #CareerGrowth

🐧 𝗟𝗶𝗻𝘂𝘅 𝗦𝘁𝗼𝗿𝗮𝗴𝗲 𝗖𝗼𝗺𝗺𝗮𝗻𝗱𝘀 — 𝗠𝘂𝘀𝘁 𝗞𝗻𝗼𝘄 𝗳𝗼𝗿 𝗗𝗲𝘃𝗢𝗽𝘀 If you’re working with Linux, understanding storage isn’t optional… it’s a 𝗰𝗼𝗿𝗲 𝘀𝗸𝗶𝗹𝗹 👇 💡 𝗠𝘂𝘀𝘁-𝗞𝗻𝗼𝘄 𝗖𝗼𝗺𝗺𝗮𝗻𝗱𝘀: 🗂️ 𝗗𝗶𝘀𝗸 & 𝗣𝗮𝗿𝘁𝗶𝘁𝗶𝗼𝗻𝘀 • fdisk, gdisk → Manage partitions • lsblk → View block devices 📊 𝗦𝗽𝗮𝗰𝗲 & 𝗨𝘀𝗮𝗴𝗲 • du, ncdu → File/directory usage • df → Filesystem usage ⚡ 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 & 𝗜𝗢 • iostat → Disk I/O stats • iotop → Process-level I/O • ioping → Disk latency 🛠️ 𝗗𝗶𝘀𝗸 𝗛𝗲𝗮𝗹𝘁𝗵 • smartctl → Monitor disk health • fsck → Repair filesystem 🔍 𝗙𝗶𝗹𝗲 & 𝗦𝘆𝘀𝘁𝗲𝗺 • stat → File details • lsof → Open files 🔗 𝗠𝗼𝘂𝗻𝘁 & 𝗖𝗼𝗻𝗳𝗶𝗴 • mount → Mount filesystems • findmnt → Show mount points • hdparm → Disk parameters ⚡ 𝗞𝗲𝘆 𝗜𝗻𝘀𝗶𝗴𝗵𝘁: 𝗠𝗼𝘀𝘁 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗶𝘀𝘀𝘂𝗲𝘀 𝗰𝗼𝗺𝗲 𝗳𝗿𝗼𝗺 𝗱𝗶𝘀𝗸 / 𝗜𝗢 𝗯𝗼𝘁𝘁𝗹𝗲𝗻𝗲𝗰𝗸𝘀 📌 If you know these commands → you can debug issues 𝗳𝗮𝘀𝘁 & 𝗰𝗼𝗻𝗳𝗶𝗱𝗲𝗻𝘁𝗹𝘆 That’s what real DevOps engineers do 🚀 Follow Sumaiya for more 💻✨ #Linux #DevOps #Cloud #SRE #SystemAdmin #Tech

🚨 Most DevOps engineers use Linux daily…............... But many don’t fully understand its file system — and that’s a hidden gap. If you work with:- ⚙️ Kubernetes ⚙️ CI/CD pipelines ⚙️ Cloud VMs Then Linux isn’t just a tool — it’s your foundation................... 📂 Linux File System (Simplified): /boot → Boot files (kernel, GRUB) /etc → System configuration /home → User files /root → Root user home /opt → Third-party apps /dev → Devices as files /var → Logs & runtime data (start here for debugging) /bin → Basic commands /sbin → Admin commands /usr → Apps & libraries /proc → Process info (real-time) /sys → Hardware interface /run → Runtime data /tmp → Temporary files 📌 Bonus: /lib, /lib64 → Libraries /mnt, /media → Mount points /srv → Service data /lost+found → Recovered files 💡 Why it matters: ✔ Faster debugging (/var/log first) ✔ Better automation ✔ Stronger security handling ✔ More confidence in production 👉 Don’t just use Linux. Master it. #DevOps #Linux #CloudComputing #Kubernetes #AWS #Azure #SRE #Infrastructure #SysAdmin #TechCareers #Programming #Containers #CICD #LearningInPublic #CareerGrowth

🚨 Most DevOps engineers use Linux daily… But many don’t actually understand its file system. That’s a hidden skill gap. If you're working with: ⚙️ Kubernetes ⚙️ CI/CD pipelines ⚙️ Cloud VMs Then Linux isn’t just a tool — it’s your foundation. Without understanding its structure, debugging becomes guesswork. 📁 Linux File System Hierarchy (FHS) — Simplified /boot → System startup files (kernel, GRUB) /etc → Configuration (the brain of your system) /home → User data & files /root → Root user’s home /opt → Third-party software /dev → Devices as files /var → Logs, cache, runtime data (start here for debugging) /bin → Essential commands (ls, cp, cat) /sbin → Admin/system commands /usr → Applications & shared libraries /proc → Process + kernel insights (real-time) /sys → Hardware & kernel interface /run → Runtime state (since last boot) /tmp → Temporary files (auto-cleaned often) 📌 Bonus: /lib, /lib64 → Core libraries /mnt, /media → Mount points /srv → Service data /lost+found → Recovered files 💡 Why this matters (real DevOps impact) ✔ Debug issues faster → check /var/log first ✔ Understand containers at a deeper level ✔ Write better automation scripts ✔ Handle permissions & security confidently ✔ Stay calm during production outages 💬 Quick check: If your app goes down… Which directory do you check first? 👉 Don’t just use Linux. Master it. #DevOps #Linux #CloudComputing #Kubernetes #AWS #Azure #SRE #Infrastructure #SysAdmin #TechCareers #Programming #Containers #CI_CD #LearningInPublic #CareerGrowth

Linux commands every DevOps Engineer should know 🐧 Not theory. Not a tutorial. These are commands I actually use daily. ✅ Save this — you’ll thank yourself later 🔖 🖥️ File & Directory • ls -la → list all files (incl hidden) • cd - → go back to previous dir • mkdir -p → create nested dirs • rm -rf → delete folder (careful ⚠️) 🔍 Logs & Debugging (most important 👀) • tail -f app.log → live logs • grep "error" → find issues quickly • less app.log → scroll large files ⚙️ Process & Services • ps aux → check processes • top / htop → resource usage • systemctl status → service health • kill -9 → stop process 🌐 Networking • curl → test APIs • ping → check connectivity • ss -tulnp → open ports 📦 System & Disk • df -h → disk usage • du -sh * → folder sizes • free -m → memory usage After 4+ years in DevOps, I can say this: These aren’t “nice to know” commands. These are the ones you reach for when production breaks. Debugging? → tail + grep Disk issue? → df + du Service down? → systemctl Master these, and Linux stops feeling scary. What’s one command you use daily? 👇 #DevOps #Linux #SRE #CloudComputing #AWS #Engineering