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Explain How the Linux Boot Process Works
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Linux installation program This is why this happens If the BIOS finds a bootable device higher up in the list, it won t get to the CD that you want to boot from So how does the BIOS know if a device is bootable or not It looks in the first sector of the device, which is called the boot sector On a hard disk drive, the boot sector contains the master boot record (MBR) Let s discuss the role of the MBR next in the bootloader phase
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The Bootloader Phase
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After finishing the POST process, the BIOS really doesn t have much more to do It has done its job and is ready to turn control of the system over to someone else To do this, it needs to know where programming resides that can take over the system To do this, it looks for the MBR on your system s hard drive The MBR resides in the boot sector of your system s hard disk drive It plays a key role in the process of booting your Linux system The MBR tells the system where a bootloader resides The bootloader has a very important job The issue here is that your computer needs an operating system of some type to access the hard disk drive and load data into RAM from it At this point in the boot process, we need to load the operating system itself from the hard drive into memory How do you load an operating system into memory from the hard drive if you need to have an operating system to load data from the hard drive This is the job of the bootloader The bootloader is software that the BIOS can load from the MBR of the hard drive that will allow the CPU to access the disk and load the operating system into RAM To do this, the bootloader is configured with the location of the operating system files on the hard disk drive The bootloader software itself may or may not actually be in the MBR As we ll see later in this chapter, you can install some bootloaders within the MBR or you can install them within a partition somewhere else on the hard drive and place a pointer in the MBR Other bootloaders actually reside in both places After loading the bootloader software into memory, the BIOS turns control of the system over to the bootloader The bootloader may be configured to automatically load an operating system from the hard drive or it may be configured to provide end users with a menu that allows them to select which operating system to load With later Linux kernels, the bootloader may also create a temporary, virtual file system in your system RAM called a ramdisk This file system is called initrd image The term initrd stands for initial ramdisk
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11: Managing the Linux Boot Process
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This image contains a basic file system that can be used to complete a variety of startup tasks The reason the initrd image is used is because Linux systems can use a wide variety of devices for the root (/) file system Some devices may be created from a software RAID array (which we ll discuss later in this book); some devices may even reside on a different computer and are accessed through the NFS or Samba services These types of file systems can t be mounted by the kernel until special software is loaded, which, of course, resides on those file systems It can t be done! To make the system boot correctly in these situations, the bootloader creates a small, virtual hard drive in memory called a ramdisk and transfers a temporary root file system from the initrd image to it The Linux kernel can then use this temporary file system to load the software and complete the tasks required for it to mount the real file systems on these other types of devices
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