Linux Learning 134 Unit 11

unit11 System Recovery

1. System Startup process

Power

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BIOS (in read-only storage on the motherboard, basic input or output system)

function, hardware detection, activation hardware

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Grub System boot (grub boot divided into two stages)

1) Stage 1 MBR (Master boot record) master boot record 0 tracks on hard disk, one sector, 446 bytes

*) dd If=/dev/zero Of=/dev/vda bs=446 count=1 can empty MBR

*) go to save mode, perform chroot/mnt/sysimage switch to real/environment,

and execute GRUB2-INSTALL/DEV/VDA

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2) Phase 2 Grub File boot phase

Locate the/boot partition

Read /boot/grub2/grub.cfg

file lost,grub2-mkconfig >/boot/grub2/grub.cfg

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boot kernel, read-only mount /device

Testing equipment

Initialize the device driver

Enter the system initialization phase

Kernel is missing, the new kernel installation package can be resolved

RPM-IVH kernel-xxxxx.rpm--force

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System initialization phase

system initialization phase load INITRD mirror

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Open Initialization Process systemd ( start screen press E, delete to Ro,ro to RW, and then add Rd.break,ctrl+x exit )

Start SELinux

Load Kernel parameters

Initialize the system clock, keyboard, host name

re-read/write mount /device

activating RAID,LVM

Activate quotas

start All services in the multi-user.target.wants

Turn on the Virtual Console

Start graphics

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initramfs-' Uname-r '. IMG Lost by:

MKINITRD initramfs-' uname-r '. img ' uname-r '

Recovery

Change Password

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Linux Learning 134 Unit 11