CentOS6.3 start of the relevant knowledge of the detailed

CentOS6.3 start of the relevant knowledge of the detailed

CentOs 6.3 Press E before starting and then press E to proceed to the GNU Grub page.

GNU GRUB is a multiple operating system startup manager. GRUB is the abbreviation for Grand Unified bootloader.

Root (hd0,0)

root specifies the location at startup, hd0 the first hard disk of the computer, and the following digits represent the meaning of the partition, that is, the first partition. The whole meaning is: start from the first partition of the first hard disk

kernel/boot/vmlinuz-2.6.32-358.el6.x86_64 ro root=uuid=6e24ec7a-2d19-466e-bacc-92750b1f4bef Rd_NO_LUKS Rd_NO_LVM Lang=en_us. UTF-8 rd_no_md sysfont=latarcyrheb-sun16 crashkernel=auto keyboardtype=pc keytable=us Rd_NO_DM rhgb quiet

Kernel is a gurb command to load the Linux kernel, which represents the operating system's kernel storage location, and the current CentOS operating system's kernel is stored in the/boot directory vmlinuz-2.6.32-358.el6.x86_64, followed by the kernel parameters, RO represents read-only, each parameter is separated by a space.

Select this option, and then press E, you can edit this command, the cursor directly to the command at the end, we can add the relevant parameters at the end, press ENTER to save the changes, return to the Grub page, and then press B to start the kernel with a custom parameter.

Initrd/boot/initramfs-2.6.32-358.el6.x86_64.img

The

INITRD full name initial RAM disk. Why Linux started so fast, because its operating system's kernel is very streamlined, in order to keep the Linux kernel thin, we will be its less common drivers, functions compiled into modules, when needed to dynamically load. So this initrd is stored in our less common drive, the function of the compiled modules. The previous Linux version used the Initrd file, Initramfs is an alternative optimized version of INITRD, more space-saving and more flexible than the initrd. So now the Linux version is using the Initramfs