Why always me?- Power On
- Boot Loader (Grub)
- Kernel
- init system (systemd)
- start services (services that start on boot)
- Display manager (One of those services)
- login
Boot Loader
The boot loader is the first program that runs when a computer starts. It is responsible for loading the operating system into memory and starting the boot process. The boot loader is typically stored in the Master Boot Record (MBR) or the EFI System Partition (ESP) on the hard drive.
Grub
GRUB (GRand Unified Bootloader) is a popular boot loader used in many Linux distributions. It provides a menu interface that allows users to select which operating system to boot into. GRUB can load Linux kernels directly or chain-load other boot loaders.
Kernel
The kernel is the core of the operating system that manages system resources and provides an interface for applications to interact with hardware. The kernel is loaded into memory by the boot loader and initializes the system.
init system (systemd)
The init system is the first process that runs on a Linux system and is responsible for starting and managing system services. systemd is a modern init system used in many Linux distributions that provides advanced features for managing services and system resources.
start services
After the kernel and init system are loaded, system services are started to initialize the system. These services include network configuration, device drivers, and other system components.
Display manager
The display manager is a system service that provides a graphical login interface for users. It starts after the system services are initialized and allows users to log in and start a graphical desktop environment.
login
Once the display manager is started, users can log in to the system and start a user session. The user session provides access to the desktop environment and applications running on the system.