zebra barcode printer vb net Explain How the Linux Boot Process Works in Software

Creating Code 128C in Software Explain How the Linux Boot Process Works

Explain How the Linux Boot Process Works
Code 128 Code Set A Printer In None
Using Barcode generator for Software Control to generate, create Code 128 image in Software applications.
Code 128 Recognizer In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Let s begin this chapter by discussing how the Linux boot process works
Code-128 Encoder In C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create Code-128 image in VS .NET applications.
Generate Code 128 Code Set B In .NET
Using Barcode generation for ASP.NET Control to generate, create Code 128A image in ASP.NET applications.
CERTIFICATION OBJECTIVE 1101
Code128 Generator In .NET Framework
Using Barcode printer for VS .NET Control to generate, create Code128 image in .NET applications.
Encode Code 128 Code Set B In Visual Basic .NET
Using Barcode generator for .NET framework Control to generate, create Code128 image in Visual Studio .NET applications.
Explain How the Linux Boot Process Works
Data Matrix ECC200 Generation In None
Using Barcode maker for Software Control to generate, create ECC200 image in Software applications.
Printing Bar Code In None
Using Barcode drawer for Software Control to generate, create bar code image in Software applications.
A key concept for Linux administrators to understand is how the operating system boots The Linux boot process is a little more complicated than the boot process used by many other operating systems that you may already be familiar with Therefore, we re going to spend some time at the beginning of this chapter outlining how the process works Understanding the boot process will be of great benefit to you when we discuss how to configure bootloaders and runlevels later in this chapter Understand that the process we ll discuss in this chapter is generic in nature Most Linux distributions will follow the same basic process, although the specific implementation of the process may vary between distributionsThe process also varies between older and newer versions of the Linux kernel The first time I booted a Linux system back in the 1990s, a string of unintelligible messages (at least to me) was displayed on the screen as the system started up I had no idea what they were talking about What s this vmlinuz thing anyway Today, most of the Linux operating system s boot messages are hidden by splash screens on most popular distributions, as shown in Figure 11-1 These splash screens make things pretty, but they also hide a lot of information that can be very useful to the system admin Fortunately, with most distributions, you can still view these messages if you press the key when the splash screen is displayed A sample is shown in Figure 11-2 The messages often scroll by too quickly to be readYou can enter dmesg | more to review the messages displayed during the boot process I highly recommend that you do this very thing after reading this part of this chapter It will help solidify the boot process concepts we re going to be reviewing
Draw USS Code 128 In None
Using Barcode encoder for Software Control to generate, create Code128 image in Software applications.
Draw Code39 In None
Using Barcode creation for Software Control to generate, create Code-39 image in Software applications.
11: Managing the Linux Boot Process
Make GTIN - 12 In None
Using Barcode generator for Software Control to generate, create UPC Symbol image in Software applications.
Barcode Drawer In None
Using Barcode creation for Software Control to generate, create barcode image in Software applications.
FIGURE 11-1
USPS PLANET Barcode Generation In None
Using Barcode maker for Software Control to generate, create USPS PLANET Barcode image in Software applications.
Encoding Barcode In VB.NET
Using Barcode creator for Visual Studio .NET Control to generate, create bar code image in .NET framework applications.
Linux splash screen
Painting Code 128 Code Set A In Java
Using Barcode creation for Java Control to generate, create Code 128 Code Set A image in Java applications.
UPC-A Supplement 2 Generator In None
Using Barcode generator for Online Control to generate, create UPC-A Supplement 2 image in Online applications.
To make the Linux boot process more digestible, we re going to break it down into the following phases:
Print Code128 In Visual C#
Using Barcode generation for .NET Control to generate, create Code128 image in VS .NET applications.
Printing ECC200 In Objective-C
Using Barcode encoder for iPhone Control to generate, create ECC200 image in iPhone applications.
The BIOS phase The bootloader phase The kernel phase
Recognizing ANSI/AIM Code 128 In VB.NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Code 128B Printer In Java
Using Barcode encoder for Android Control to generate, create Code 128 Code Set C image in Android applications.
Let s start by discussing the BIOS phase
Explain How the Linux Boot Process Works
FIGURE 11-2
Linux boot messages
The BIOS Phase
Regardless of what operating system you re using, when you first power on an x86 personal computer, the system BIOS is the first component to take charge of the boot process The system BIOS is a ROM chip integrated in the motherboard that contains a series of very small programs and drivers that allow the CPU to communicate with basic system devices, such as the keyboard, I/O ports, the system speaker, system RAM, floppy disk drives, and hard drives Variable information about your system, such as the amount of RAM installed, the geometry of your hard drives, and the type of floppy disk installed, are stored in the CMOS chipThe BIOS uses the data in the CMOS chip to address these devices
11: Managing the Linux Boot Process
The BIOS plays two key roles during the boot process First, it tests the various system components and makes sure they are working properly This is called the power on self test, otherwise affectionately known as POST If the BIOS encounters any problems with system devices, it will either display a cryptic error message on the screen or it will sound a series of beeps in code You can use your BIOS documentation easily available on the Internet by searching on the motherboard model number or BIOS manufacturer, or sometimes included in the manual for your motherboard to interpret these messages to determine what exactly is wrong with the system The second role played by the BIOS is that it selects a storage device to boot the operating system from Most system setup programs (which are also small programs contained in the BIOS) allow you to configure the order in which the BIOS should look for bootable media In Figure 11-3, the system has been configured to first look on the floppy disk drive, then on the local hard disk drive, then on the CD-ROM drive The BIOS will boot from the first bootable device it finds in the list Recall back when we installed Linux early in this book I told you that you need to be sure your BIOS is set to boot off the CD first, otherwise you probably won t be able to load the
FIGURE 11-3
Copyright © OnBarcode.com . All rights reserved.