How Swap Memory Works and Why It Matters for System Performance

🚨 Disk space – the silent culprit behind VM & service failures! Recently, I ran into an issue where a VM refused to restart services, throwing the error: 👉 “No space left on device” At first, running du -sh * showed normal usage… but the real problem was elsewhere. Here’s what helped me troubleshoot ⬇️ 🔎 Essential Disk Checks in Linux: 💽 Check overall disk usage: df -h 📊 Check inode usage (often overlooked): df -i 📂 Find the biggest directories: sudo du -sh /* | sort -h 🗑️ Detect deleted files still eating space: lsof | grep deleted ⚡ Takeaway: Disk space is not just about “storage”. It directly impacts: ✔️ Service restarts ✔️ VM stability ✔️ Uptime & reliability ✅ Lesson: Always include disk utilization checks (both space & inodes) in your troubleshooting checklist. 💬 What’s your go-to Linux command for catching disk issues quickly? #Linux #DevOps #CloudEngineering #Troubleshooting #SRE

📢 The floppy disk controller code in Linux receives a new improvement in 2025! 💾 Although floppy disks seem like technology from the past, the Linux kernel continues to maintain its support. Recently, kernel developer Jiri Kosina introduced a significant improvement to the floppy driver. 🔧 The update allows the driver to be compiled as a loadable module, rather than having to be integrated directly into the kernel. This optimizes resource usage in systems where this driver is not needed. 🛠️ Despite the hardware being obsolete, this type of maintenance demonstrates the open-source community's commitment to backward compatibility and system efficiency. 💡 The improvement not only benefits legacy environments but also reflects Linux's philosophy of maintaining historical functionalities without sacrificing modern performance. For more information visit: https://enigmasecurity.cl Are you surprised that code for floppy disks is still being maintained in 2025? Share your opinion! #Linux #Kernel #OpenSource #RetroComputing #Development #Technology #FreeSoftware #LegacySystems Let's connect on LinkedIn: https://lnkd.in/ej-vFb7f 📅 Wed, 27 Aug 2025 17:43:11 +0200 🔗Subscribe to the Membership: https://lnkd.in/eh_rNRyt

The document illustrates how Linux system performance can be observed across: Hardware (CPU, Memory, Disks, Network, Fans) Kernel subsystems (Schedulers, Virtual Memory, Filesystems, Networking stack) User space (Applications, Libraries, Syscalls) The tool highlighted is sar (System Activity Reporter), part of sysstat, which collects and reports system performance metrics.

🚀 I’ve just released a new version of Sib. This release includes: ⚡ IOUring support for ultra-fast async I/O on Linux kernel 5.6+ 🌐 HTTP/2 and HTTP/3 support with full protocol compliance 📂 High-performance file server based on epoll/kqueue/iocp and IOUring. Sib, written in Rust, is open source and designed to power the future of edge computing. It’s fast; measured by TechEmpower Benchmarks and you can test it yourself. 👉 TechEmpower: https://lnkd.in/dm68C8Wj 👉 Source: https://lnkd.in/deXZGVNX #Networking #EdgeComputing #Rust #RustLang #opensource #Sib #CloudNative #CNCF

What is the Linux Kernel? The Linux kernel is the core of the operating system. It acts as a bridge between applications and hardware. Without it, your software cannot talk to your computer’s CPU, memory, or devices. Here’s what the kernel does: Manages hardware: Allocates CPU, memory, and devices to different programs. Controls processes: Keeps track of running programs and ensures stability. Handles system calls: Applications request services (like saving a file), and the kernel communicates with the hardware. Provides security: Manages permissions and access control. Think of a computer like a restaurant: Hardware = the kitchen and ingredients Applications = customers placing orders Kernel = the chef who takes the orders and uses the kitchen to prepare food In short, the Linux kernel is the brain of the system, ensuring smooth communication between software and hardware. #Linux #OperatingSystem #Learning

✅ Successfully Configured a Single-Node Kubernetes Cluster Recently, I set up a Kubernetes single-node cluster from scratch to strengthen my container orchestration skills. ⚙️ System Configuration OS: CentOS 7 (Linux) Resources: 4 GB RAM, 2 CPU cores Static setup: Configured static IP & hostname Pre-checks: Disabled firewall, swap, and SELinux for cluster compatibility Kernel tuning: Applied network parameter tuning for Kubernetes networking Container runtime: Installed Docker 19.03.12 Kubernetes components: Installed kubeadm, kubelet, kubectl along with required packages from local RPM This environment will serve as my hands-on lab for testing workloads, practicing deployments, and experimenting with Kubernetes features. #Get k8spackages: https://lnkd.in/g_9KhSbr #Kubernetes #DevOps #Linux #Containers #Docker #CloudComputing

Have you ever wondered how your laptop magically understands files — whether they’re on an SSD, USB, or even a CD? That question hit me the first time I plugged in a flash drive and it just… worked. 💡 But behind that magic is one of the most underrated heroes in computing: the File System. Here’s the story 👇 👉 At the lowest level, you have hardware (your disks: SSDs, HDDs, tapes). 👉 Above that, the OS doesn’t talk to hardware directly — it uses supported file systems like EXT4, NTFS, FAT, ZFS, BTRFS. 👉 Then comes the Virtual File System (VFS) layer — a genius abstraction that makes all file systems look the same to the Kernel. 👉 Finally, the Kernel sits at the top, managing all requests, so your apps can read/write files without caring whether they’re on Linux, Windows, or a USB stick. 💡 Lesson: File Systems are like translators — they speak the language of your hardware and present it in a universal way your computer can understand. Without them, a simple “save file” would be chaos. 👉 Question for you: Which file system have you used the most — NTFS, EXT4, or something modern like BTRFS/ZFS? And why? #OperatingSystems #FileSystems #Linux #SystemDesign #LearningTogether

“Have you ever wondered how your laptop magically understands files — whether they’re on an SSD, USB, or even a CD?” That question hit me the first time I plugged in a flash drive and it just… worked. 💡 But behind that magic is one of the most underrated heroes in computing: the File System. Here’s the story 👇 👉 At the lowest level, you have hardware (your disks: SSDs, HDDs, tapes). 👉 Above that, the OS doesn’t talk to hardware directly — it uses supported file systems like EXT4, NTFS, FAT, ZFS, BTRFS. 👉 Then comes the Virtual File System (VFS) layer — a genius abstraction that makes all file systems look the same to the Kernel. 👉 Finally, the Kernel sits at the top, managing all requests, so your apps can read/write files without caring whether they’re on Linux, Windows, or a USB stick. 💡 Lesson: File Systems are like translators — they speak the language of your hardware and present it in a universal way your computer can understand. Without them, a simple “save file” would be chaos. 👉 Question for you: Which file system have you used the most — NTFS, EXT4, or something modern like BTRFS/ZFS? And why? #OperatingSystems #FileSystems #Linux #SystemDesign #LearningTogether

💥 This Linux Automation script will save you hours💥 Ever SSH into a server and think: “What the hell is going on here?” That’s why I made this: ✅ 1 Linux script to rule them all – Checks CPU, RAM, Disk, Network, Services — everything. Just copy → paste → run. Instant system health check. No more digging through 10 commands. ✅ Here’s what it does: • Shows top processes eating your RAM • Lists open ports & network interfaces • Highlights disk space issues • Prints running services • And more… #!/bin/bash echo "===== SYSTEM HEALTH CHECK =====" echo "Hostname: $(hostname)" echo "Uptime: $(uptime -p)" echo echo "== CPU Load ==" uptime echo echo "== Memory Usage ==" free -h echo echo "== Disk Usage ==" df -h --total echo echo "== Top Processes ==" ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem | head -10 echo echo "== Network Interfaces ==" ip a echo echo "== Listening Ports ==" ss -tuln echo echo "== Running Services (systemd) ==" systemctl list-units --type=service --state=running | head -20 echo "===== END =====" 💬 What’s your go-to script? Drop it below! hashtag #Linux hashtag #ShellTips hashtag #DevTools hashtag #Productivity hashtag #alias #CyMuxima+NekaSecurity

Contributing to Linux Kernel 6.16! Recently I has a opportunity to send a patch that improve the way how the KASAN handle the hardware tags (HW_TAGS) on the ARM MTE. Until now, each HW_TAGS and SW_TAGS was use 8 bits for store tags. But, due to the design of MTE (Memory Tagging Extension), we only need 4 bits for HW_TAGS. This change optimize the use of bits in the flags pages, improving the efficiente of code. This patch born from suggestion of Andrey Konovalov, and was a great opportunity to learn more about internal details of KASAN and memory management in the Kernel. I Writed on my blog the technical background of this contributing, explaning the change and the though behind this. #Linux #Kernel #OpenSource #C #Rust #LowLevelEngineering https://lnkd.in/dQYTgtWK