DevOps Starter
First steps into DevOps — Linux basics, Git, Docker, and your first CI pipeline.
Jun 20, 2026
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Linux
46 articles
How to Install and Configure Docker on Ubuntu 24.04
A complete step-by-step guide to installing Docker on Ubuntu 24.04 LTS — covering installation, post-install setup, Docker Compose, firewall …
Apr 8, 2026
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How to Install and configure Nginx on Ubuntu 24 04
A complete step-by-step guide to installing Nginx on Ubuntu 24.04 LTS — covering installation, firewall setup, virtual hosts, SSL with Let's …
Apr 6, 2026
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Linux for DevOps
How the previous 15 Linux fundamentals directly power containers, Kubernetes, CI/CD, and infrastructure automation — the concepts that …
Jan 20, 2026
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Linux Logs
Where Linux logs live — the systemd journal vs /var/log, log rotation with logrotate, and practical log-reading commands for incident …
Jan 20, 2026
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Linux Storage Fundamentals
Disks, partitions, LVM, RAID basics, swap, and the commands to inspect and manage storage on a Linux system.
Jan 20, 2026
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Linux Networking Fundamentals
How Linux handles networking — interfaces, IP addressing, routing, DNS resolution, sockets, and the essential diagnostic commands.
Jan 20, 2026
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Services & systemd
How systemd manages services — unit files, targets, dependencies, timers, and the day-to-day systemctl/journalctl commands.
Jan 20, 2026
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Linux Boot Process
The full boot sequence — firmware, bootloader, kernel initialization, initramfs, and systemd targets — plus how to debug a failed boot.
Jan 20, 2026
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systemd & Service Commands
systemctl and journalctl — the everyday commands for starting, stopping, enabling, and reading logs for services managed by systemd.
Jan 20, 2026
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Processes & Jobs
Process states, PID/PPID, fork/exec, foreground vs background jobs, signals, and the tools to inspect and control running processes.
Jan 20, 2026
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DNS Resolution Failures
A runbook for diagnosing DNS resolution problems on Linux — resolver configuration, the /etc/hosts override trap, and telling a DNS issue …
Jan 20, 2026
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System Monitoring Commands
top, htop, vmstat, iostat, free, and uptime — the commands for reading CPU, memory, disk I/O, and load on a live Linux system.
Jan 20, 2026
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Linux Permissions
The read/write/execute permission model, chmod numeric vs symbolic notation, ownership, setuid/setgid/sticky bit, umask, and ACLs.
Jan 20, 2026
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High Load Average
A runbook for interpreting and diagnosing a high Linux load average — and why it doesn't automatically mean a CPU problem.
Jan 20, 2026
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Zombie & Defunct Processes
A runbook for diagnosing zombie (defunct) processes on Linux — why they accumulate, why kill -9 doesn't work on them, and how to actually …
Jan 20, 2026
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Users & Groups
How Linux models identity — UID/GID, /etc/passwd, /etc/shadow, primary vs supplementary groups, sudo, and user management commands.
Jan 20, 2026
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Archiving & Compression Commands
tar, gzip, zip, and rsync — bundling, compressing, and transferring files and directories on Linux.
Jan 20, 2026
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Permission Denied Errors
A runbook for diagnosing 'Permission denied' errors on Linux — file permissions, ownership, directory traversal permissions, ACLs, and …
Jan 20, 2026
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Package Management Commands
apt, yum/dnf, rpm, and dpkg — installing, updating, removing, and querying software packages across Debian- and Red Hat-based distros.
Jan 20, 2026
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Linux File Types
The seven file types Linux recognizes — regular files, directories, symlinks, device files, pipes, and sockets — and how to identify them.
Jan 20, 2026
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Network Connectivity Issues
A layered runbook for diagnosing 'can't connect' problems on Linux — working outward from the local interface through routing, DNS, …
Jan 20, 2026
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Files & Directories
Inodes, hard links vs symbolic links, essential file/directory commands, and how the filesystem tracks files under the hood.
Jan 20, 2026
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Disk & Storage Commands
df, du, lsblk, mount, and the commands for inspecting disk usage, partitions, and filesystems on Linux.
Jan 20, 2026
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Service Won't Start
A systemd runbook for diagnosing why a service fails to start — reading journalctl and systemctl status correctly, and the most common root …
Jan 20, 2026
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Networking Commands
ip, ss, curl, dig, and the essential command-line tools for configuring, inspecting, and troubleshooting networking on Linux.
Jan 20, 2026
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Linux Filesystem
The Filesystem Hierarchy Standard, mount points, filesystem types (ext4, xfs, tmpfs), and how storage devices become directories.
Jan 20, 2026
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Slow Disk I/O
A runbook for diagnosing storage-bound performance problems on Linux — reading iostat correctly and telling apart a slow disk from a slow …
Jan 20, 2026
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Shell & Terminal
Terminal vs shell explained in plain English, Bash vs sh vs Zsh, how a command actually gets executed, environment variables, PATH, and …
Jan 20, 2026
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Permissions & User Commands
chmod, chown, useradd, usermod, sudo, and the everyday commands for managing file permissions, ownership, and user accounts.
Jan 20, 2026
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Process & Job Commands
ps, top, htop, kill, nice, and job control commands for inspecting and managing running processes on Linux.
Jan 20, 2026
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Linux Kernel
What the Linux kernel actually is and does, explained in plain English — process management, memory management, the filesystem, devices, …
Jan 20, 2026
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Disk Full — No Space Left on Device
A runbook for diagnosing and recovering from a full disk on Linux, including the inode-exhaustion and deleted-but-open-file variants that df …
Jan 20, 2026
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Text Processing Commands
grep, sed, awk, cut, sort, uniq, and the Unix pipeline philosophy — the tools that let you slice and transform text without writing a …
Jan 20, 2026
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Linux Architecture
The layered architecture of Linux — hardware, kernel space, user space, system calls, and how they fit together.
Jan 20, 2026
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High Memory Usage & OOM Kills
A runbook for diagnosing memory pressure and OOM killer events on Linux — reading free correctly, finding the memory hog, and confirming a …
Jan 20, 2026
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Linux MCQ — Basics to Advanced
40 multiple-choice questions covering the Linux kernel, filesystem, permissions, processes, boot process, systemd, networking, storage, and …
Jan 20, 2026
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Linux Command Cheatsheet
A single-page, at-a-glance Linux command reference — files, permissions, processes, networking, text processing, disk, packages, archiving, …
Jan 20, 2026
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Introduction to Linux
What Linux really is, how it compares to Unix and Windows, where it came from, the major distributions you'll actually run into, and why it …
Jan 20, 2026
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High CPU Usage
A runbook for diagnosing sustained high CPU usage on a Linux server — from identifying the offending process down to the exact thread and …
Jan 20, 2026
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File & Directory Commands
The essential Linux commands for navigating, creating, copying, moving, and searching files and directories, with real flags and use cases.
Jan 20, 2026
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Bash Fundamentals
What Bash actually is, the shebang line, script permissions and execution, comments, and the anatomy of a first real script.
Jan 20, 2026
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Interview Q&A Part 03
40+ Linux interview questions and answers covering processes, file system, permissions, services, and troubleshooting — Basic to Advanced.
Apr 26, 2025
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Interview Q&A Part 02
40+ Linux interview questions and answers covering processes, file system, permissions, services, and troubleshooting — Basic to Advanced.
Apr 26, 2025
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Interview Q&A Part 01
40+ Linux interview questions and answers covering processes, file system, permissions, services, and troubleshooting — Basic to Advanced.
Apr 26, 2025
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Linux Engineer Learning Path
A complete roadmap to mastering Linux — from basic commands to system administration, shell scripting, networking, security hardening, and …
Jan 18, 2025
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