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# vi /etc/default/grub GRUB_TIMEOUT=5 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" GRUB_DEFAULT=saved GRUB_SAVEDEFAULT=true GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT="console" GRUB_TERMINAL="serial console" GRUB_SERIAL_COMMAND="serial --speed=115200" GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap console=ttyS0,115200n8" GRUB_DISABLE_RECOVERY="true" # grub2-mkconfig -o /boot/grub2/grub.cfg # reboot |