How the Linux Boot Process Works | Step-by-Step Explained

From the moment you press the power button to the point where you see a login prompt, Linux goes through a carefully designed, multi-stage boot process.

In this video, we explain how the Linux boot process works step by step, covering firmware, bootloaders, the kernel, and the user-space init system—without unnecessary complexity.

🔍 What You’ll Learn

What happens immediately after the system powers on

BIOS vs UEFI: firmware’s role in booting

How the bootloader works (using GRUB as an example)

How the Linux kernel is loaded into memory

Kernel initialization: hardware detection, drivers, and memory setup

What initramfs is and why it exists

How the kernel starts the first user-space process

The role of systemd (PID 1)

How services start and the system reaches a usable state

🧠 Why Understanding the Boot Process Matters

Knowing how Linux boots helps you:

Debug boot failures and kernel panics

Customize and optimize startup time

Build minimal Linux systems

Understand init systems and service management

Learn operating system internals

This knowledge is essential for:

Linux administrators

Systems programmers

Embedded and DevOps engineers

Anyone serious about understanding Linux beyond surface-level usage

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