How do I change redhat kernel command line parameters for all boot entries?



  • Also see: grub2-mkconfig(1) — Generate a GRUB configuration file.

    This example shows changing the kernel logging.

    Initial check of the kernel logging.

    $ sysctl kernel.printk
    kernel.printk = 7       4       1       7
    

    Edit the file /etc/default/grub make changes to the GRUB_CMDLINE_LINUX variable.

    For this example "quite" was added to the end of the line.

    GRUB_CMDLINE_LINUX="console=ttyS0,115200n8 console=tty0 net.ifnames=0 rd.blacklist=nouveau crashkernel=auto quiet"
    

    Update the GRUB2 configuration file.

    $ sudo grub2-mkconfig -o /boot/grub2/grub.cfg
    Generating grub configuration file ...
    done
    

    Reboot when safe to do so.

    Check the status of kernel logging after reboot.

    $ sysctl kernel.printk
    kernel.printk = 4       4       1       7
    

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