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documentation.suse.com › Documentación de SUSE Linux Enterprise Server › Administration Guide › Booting a Linux system
ContentsContents
Administration Guide
  1. Preface
  2. I Common tasks
    1. 1 Bash and Bash scripts
    2. 2 sudo basics
    3. 3 YaST
    4. 4 YaST in text mode
    5. 5 YaST online update
    6. 6 Managing software with command line tools
    7. 7 System recovery and snapshot management with Snapper
    8. 8 Live kernel patching with KLP
    9. 9 Transactional updates
    10. 10 Remote graphical sessions with VNC
    11. 11 File copying with RSync
  3. II Booting a Linux system
    1. 12 Introduction to the boot process
    2. 13 UEFI (Unified Extensible Firmware Interface)
    3. 14 The boot loader GRUB 2
    4. 15 The systemd daemon
  4. III System
    1. 16 32-bit and 64-bit applications in a 64-bit system environment
    2. 17 journalctl: Query the systemd journal
    3. 18 update-alternatives: Managing multiple versions of commands and files
    4. 19 Basic networking
    5. 20 Printer operation
    6. 21 Graphical user interface
    7. 22 Accessing file systems with FUSE
    8. 23 Managing kernel modules
    9. 24 Dynamic kernel device management with udev
    10. 25 Special system features
    11. 26 Using NetworkManager
    12. 27 Power management
    13. 28 VM guest
    14. 29 Persistent memory
  5. IV Services
    1. 30 Service management with YaST
    2. 31 Time synchronization with NTP
    3. 32 The domain name system
    4. 33 DHCP
    5. 34 SLP
    6. 35 The Apache HTTP server
    7. 36 Setting up an FTP server with YaST
    8. 37 Squid caching proxy server
    9. 38 Web Based Enterprise Management using SFCB
  6. V Troubleshooting
    1. 39 Help and documentation
    2. 40 Gathering system information for support
    3. 41 Common problems and their solutions
  7. A An example network
  8. B GNU licenses
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Applies to SUSE Linux Enterprise Server 15 SP3

Part II Booting a Linux system

12 Introduction to the boot process

Booting a Linux system involves different components and tasks. After a firmware and hardware initialization process, which depends on the machine's architecture, the kernel is started by means of the boot loader GRUB 2. After this point, the boot process is completely controlled by the operating system and handled by systemd. systemd provides a set of “targets” that boot configurations for everyday usage, maintenance or emergencies.

13 UEFI (Unified Extensible Firmware Interface)

UEFI (Unified Extensible Firmware Interface) is the interface between the firmware that comes with the system hardware, all the hardware components of the system, and the operating system.

14 The boot loader GRUB 2

This chapter describes how to configure GRUB 2, the boot loader used in SUSE® Linux Enterprise Server. It is the successor to the traditional GRUB boot loader—now called “GRUB Legacy”. GRUB 2 has been the default boot loader in SUSE® Linux Enterprise Server since version 12. A YaST module is available for configuring the most important settings. The boot procedure as a whole is outlined in Chapter 12, Introduction to the boot process. For details on Secure Boot support for UEFI machines, see Chapter 13, UEFI (Unified Extensible Firmware Interface).

15 The systemd daemon

systemd is responsible for initializing the system, and it has the process ID 1. systemd is started directly by the kernel and resists signal 9, which normally terminates processes. All other programs are either started directly by systemd or by one of its child processes. systemd is a replacement f…

→Chapter 12 Introduction to the boot process←Chapter 11 File copying with RSync
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