Hands-on Booting: Learn the Boot Process of Linux, Windows, and Unix

Table of Contents
About the Author
About the Technical Reviewer
Acknowledgments
Introduction
Chapter 1: Introduction
	Why?
	What?
	The Focus of This Book
	Power Supply
	CPU
Chapter 2: Multiboot
	List of Operating Systems
	Installing the Operating Systems
		Primary/Logical Partitions
		Partitioning
		First OS Installation: XP
		Boot Sector
			OpenSolaris 2008
			PC-BSD 9.0
			Windows Server 2003
			Windows 7
			Red Hat Enterprise Linux 6 (RHEL 6)
			Tweaking GRUB
			Hacking the Windows Bootloaders
			Fedora 15
			Complete Flowchart
		Unified Extensible Firmware Interface (UEFI)
			BIOS Limitations
			UEFI Advantages
			The GUI of UEFI
			UEFI Implementation
				EFI System Partition (ESP)
				EFI
				Secure Boot
				Partition Table
			List of Operating Systems
			Ubuntu 18.04 LTS
			Windows 10
			Fedora 31
			UEFI Shell
			Misconceptions About UEFI
				Misconception 1: UEFI Is a New BIOS or UEFI Is a BIOS
				Misconception 2: Microsoft Is Evil
					Linux Vendors Should Make Their Own Key Pair
					All Linux Vendors Should Make Only One Key Pair
					Disable UEFI’s Secure Boot Feature
				Misconception 3: Disable the UEFI
Chapter 3: GRUB Bootloader
	GRUB 2 Implementation
		GRUB 2 on BIOS-Based Systems
			/boot/grub2
				Device.map
				grub.cfg
				i386-pc
			/etc/default/grub
			/etc/grub.d/
				10_linux
				20_linux_xen
				20_ppc_terminfo
				30_os_prober
				30_uefi-firmware
				40_custom and 41_custom
		GRUB 2 on UEFI-Based System
	Boot Loader Specification (BLS)
	Common Bootloader Issues
		“Can’t Boot” Issue 1 (Bootloader)
		“Can’t Boot” Issue 2 (Bootloader)
			Resolution for a BIOS-Based System
			Resolution for a UEFI-Based System
		“Can’t Boot” Issue 3 (Bootloader + Kernel)
			Resolution for BIOS-Based Systems
			Resolution for UEFI-Based Systems
	Secure Boot Feature of UEFI
	100 OS Multiboot Project
	A Dummy Small Bootloader
	GRUB 2 at a Low level
Chapter 4: Kernel
	Loading the Kernel in Memory
	After Loading the Kernel in Memory
		Protected Mode
		Long Mode
		What Extracts vmlinuz?
		extract_kernel
	Inside the Kernel
Chapter 5: initramfs
	Why initramfs?
	Infrastructure
		ramfs
		tmpfs
		rootfs
	initramfs Implementation
	bin
		Normal Binaries
		Special Binaries
		Networking Binaries
		Hooks
		Systemd Binaries
	Sbin
		Filesystem and Storage-Related Binaries
		Networking Binaries
		Special Binaries
		Basic Binaries
	etc
	Virtual Filesystems
		dev
		proc and sys
	usr, var
	lib, lib64
	initramfs Booting
		How Does the Kernel Extract initramfs from Memory?
		How Does the Kernel Mount initramfs as Root?
Chapter 6: dracut
	Getting Started
	Making an initramfs Image
	Dracut and Modules
		How Does dracut Select Modules?
		Customizing initramfs
		dracut Module or Kernel Module?
		“Can’t Boot” Issue 4 (initramfs)
		“Can’t Boot” Issue 5 (initramfs)
	Kernel Command-Line Options
		root
		init
		ro
		rhgb and quite
		selinux
	dracut Command-Line Options
		rd.auto (rd.auto=1)
		rd.hostonly=0
		rd.fstab = 0
		rd.skipfsck
		rd.driver.blacklist, rd.driver.pre, and rd.driver.post
		rd.debug
		rd.memdebug= [0-4]
		lvm, raid, and Multipath-Related dracut Command-Line Parameters
		rd.break and rd.shell
Chapter 7: systemd (Part I)
	Structure
	How Does systemd Reduce Boot Time?
		systemd-analyze
		“Can’t Boot” Issue 6 (systemd)
	Flow of systemd Inside initramfs
		systemd-journal.socket
		dracut-cmdline.service
		dracut-pre-udev.service
		dracut-pre-trigger.service
		systemd-udev-trigger.service
		local-fs.target
		swap.target
		dracut-initqueue.service
			“Can’t Boot” Issue 7 (systemd + Root LVM)
		plymouth
			Installing plymouth
			Managing plymouth
			Structure
		Sysinit.target
			“Can’t Boot” Issue 8 (sysctl.conf)
		basic.target
		dracut-pre-mount.service
Chapter 8: Debugging Shells
	The Shell
	How Does systemd Drop Us to an Emergency Shell?
	rescue.service and emergency.service
Chapter 9: systemd (Part II)
	sysroot.mount
	initrd.target
	switch_root/pivot_root
		Switching to the New Root Filesystem on an init-Based System
		Switching to a New Root Filesystem on a systemd-Based System
Chapter 10: Rescue Mode and  Live Images
	Rescue Mode
		Rescue Mode initramfs
		“Can’t Boot” Issue 9 (chroot)
		Rescue Mode of Enterprise Linux Distributions
	Live Images
		SquashFS
		rootfs.img
		Booting Sequence of a Live Image
Index