cat /etc/grub2.cfg

GRUB2 : 부트로더

어떤 것들이 부팅될때 실행되나...

• /etc/grub.d/00_header: 부트 로더 헤더를 정의합니다.
• /etc/grub.d/00_tuned: 튜닝 관련 파라미터를 정의합니다.
• /etc/grub.d/01_users: 사용자 관련 설정을 정의합니다.
• /etc/grub.d/10_linux: 리눅스 운영체제 부팅 설정을 정의합니다.
• /etc/grub.d/20_linux_xen: Xen 가상화 설정을 정의합니다.
• /etc/grub.d/20_ppc_terminfo: PowerPC에 대한 정보를 정의합니다.
• /etc/grub.d/30_os-prober: 다른 운영체제를 스캔하여 grub.cfg 파일에 추가하는데 사용됩니다.
• /etc/grub.d/40_custom: 사용자 정의 메뉴 항목을 추가하는 데 사용됩니다.
• /etc/grub.d/41_custom: 사용자 정의 설정 파일을 불러오는 데 사용됩니다.

[root@localhost jammy]# cat /etc/grub2.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
set pager=1

if [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="${saved_entry}"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

terminal_output console
if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
  set timeout=5
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/00_tuned ###
set tuned_params=""
set tuned_initrd=""
### END /etc/grub.d/00_tuned ###

### BEGIN /etc/grub.d/01_users ###
if [ -f ${prefix}/user.cfg ]; then
  source ${prefix}/user.cfg
  if [ -n "${GRUB2_PASSWORD}" ]; then
    set superusers="root"
    export superusers
    password_pbkdf2 root ${GRUB2_PASSWORD}
  fi
fi
### END /etc/grub.d/01_users ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'CentOS Linux (3.10.0-1160.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1160.el7.x86_64-advanced-61c0f77c-eee4-455a-ba86-251fd4214de0' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod xfs
	set root='hd0,msdos1'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  d31bf70a-4207-477e-b43c-16d99250a9bf
	else
	  search --no-floppy --fs-uuid --set=root d31bf70a-4207-477e-b43c-16d99250a9bf
	fi
	linux16 /vmlinuz-3.10.0-1160.el7.x86_64 root=UUID=61c0f77c-eee4-455a-ba86-251fd4214de0 ro crashkernel=auto rhgb quiet LANG=en_US.UTF-8
	initrd16 /initramfs-3.10.0-1160.el7.x86_64.img
}
menuentry 'CentOS Linux (0-rescue-d1a591529f24485abcb5c19270e4137a) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-d1a591529f24485abcb5c19270e4137a-advanced-61c0f77c-eee4-455a-ba86-251fd4214de0' {
	load_video
	insmod gzio
	insmod part_msdos
	insmod xfs
	set root='hd0,msdos1'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  d31bf70a-4207-477e-b43c-16d99250a9bf
	else
	  search --no-floppy --fs-uuid --set=root d31bf70a-4207-477e-b43c-16d99250a9bf
	fi
	linux16 /vmlinuz-0-rescue-d1a591529f24485abcb5c19270e4137a root=UUID=61c0f77c-eee4-455a-ba86-251fd4214de0 ro crashkernel=auto rhgb quiet
	initrd16 /initramfs-0-rescue-d1a591529f24485abcb5c19270e4137a.img
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_ppc_terminfo ###
### END /etc/grub.d/20_ppc_terminfo ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###