Centos 如何修改内核命令行

1、打开/etc/default/grub文件进行编辑:

#vi / etc / default / grub

2、该文件中包含多个GRUB2选项,内核引导参数由GRUB_CMDLINE_LINUX选项指定。以下是/etc/default/grub配置文件示例

GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap no_timer_check clocksource=tsc tsc=perfect intel_pstate=disable selinux=0 enforcing=0 nmi_watchdog=0 softlockup_panic=0 isolcpus=1-39 nohz_full=0-39 idle=poll default_hugepagesz=1G hugepagesz=1G hugepages=16 rcu_nocbs=1-39 kthread_cpus=0 irqaffinity=0 rcu_nocb_poll rhgb quiet"
GRUB_DISABLE_RECOVERY="true"

3、编辑完文件进行保存

4、产生新的grub.cfg 文件

  对于/etc/default/grub进行编辑之后,需要产生grun.cfg;

 对于BIOS-based 系统

grub2-mkconfig -o /boot/grub2/grub.cfg

对于 UEFI-based system

grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

5、在生成新的配置文件之后需要重启

systemctl reboot

6、最后验证内核命令行是否修改成功

cat /proc/cmdline 
BOOT_IMAGE=/vmlinuz-3.10.0-693.2.2.rt56.623.el7.x86_64 root=/dev/mapper/centos-root ro crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap no_timer_check clocksource=tsc tsc=perfect intel_pstate=disable selinux=0 enforcing=0 nmi_watchdog=0 softlockup_panic=0 isolcpus=1-39 nohz_full=0-39 idle=poll default_hugepagesz=1G hugepagesz=1G hugepages=16 rcu_nocbs=1-39 kthread_cpus=0 irqaffinity=0 rcu_nocb_poll rhgb quiet

 

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