Linux Boot kernel参数

Kernel Boot Parameters

The following table lists commonly-used kernel boot parameters.

Option	Description
1|2|3|4|5	Specifies the run level, overriding the value set in /etc/inittab.
KEYBOARDTYPE=kbtype	Specifies the keyboard type, which is written to /etc/sysconfig/keyboard in the initramfs.
KEYTABLE=kbtype	Specifies the keyboard layout, which is written to /etc/sysconfig/keyboard in the initramfs.
LANG=language_territory.codeset	Specifies the system language and code set, which is written to /etc/sysconfig/i18n in the initramfs.
max_loop=N	Specifies the number of loop devices (/dev/loop*) that are available for accessing files as block devices. The default and maximum values of N are 8 and 255.
nouptrack	Disables Ksplice Uptrack updates from being applied to the kernel.
quiet	Reduces debugging output.
rd_LUKS_UUID=UUID	Activates an encrypted Linux Unified Key Setup (LUKS) partition with the specified UUID.
rd_LVM_VG=vg/lv_vol	Specifies an LVM volume group and volume to be activated.
rd_NO_LUKS	Disables detection of an encrypted LUKS partition.
rhgb	Specifies that the Red Hat graphical boot display should be used to indicate the progress of booting.
rn_NO_DM	Disables Device-Mapper (DM) RAID detection.
rn_NO_MD	Disables Multiple Device (MD) RAID detection.
ro root=/dev/mapper/vg-lv_root	Specifies that the root file system is to be mounted read only, and specifies the root file system by the device path of its LVM volume (where vg is the name of the volume group).
rw root=UUID=UUID	Specifies that the root (/) file system is to be mounted read-writable at boot time, and specifies the root partition by its UUID.
selinux=0	Disables SELinux.
single	Boots the computer in single-user mode, without prompting for the root password.
SYSFONT=font	Specifies the console font, which is written to /etc/sysconfig/i18n in the initramfs.

The kernel boot parameters that were last used to boot a system are recorded in /proc/cmdline, for example:

# cat /proc/cmdline
ro root=/dev/mapper/VolGroup-lv_root rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us
LANG=en_US.UTF-8 rd_NO_MD rd_LVM_LV=VolGroup/lv_swap SYSFONT=latarcyrheb-sun16
rd_LVM_LV=VolGroup/lv_root rd_NO_DM rhgb quiet selinux=0

更多详情见：https://docs.oracle.com/cd/E37670_01/E41138/html/ol_kbopt.html