通过grub2修改kernel参数
cp /boot/grub2/grub.cfg /root/grub.cfg.bak
view /etc/default/grub
作者：sinat_38723234
# If you change this file, run 'grub2-mkconfig -o /boot/grub2/grub.cfg' afterwards to update
# /boot/grub2/grub.cfg.
# Uncomment to set your own custom distributor. If you leave it unset or empty, the default
# policy is to determine the value from /etc/os-release
GRUB_DISTRIBUTOR=
GRUB_DEFAULT=saved
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=8
# GRUB_CMDLINE_LINUX_DEFAULT="resume=/dev/sda1 splash=silent quiet showopts"
GRUB_CMDLINE_LINUX_DEFAULT="resume=/dev/sda1 splash=silent quiet showopts crashkernel=128M,high crashkernel=32M,low"
GRUB_CMDLINE_LINUX=""
grub2-mkconfig -o /boot/grub2/grub.cfg
view /boot/grub2/grub.cfg (to check changes)
diff /boot/grub2/grub.cfg /root/grub.cfg.bak
作者：sinat_38723234
