– 설정 변경

# vim /etc/default/grub

 

– 설정사항 반영
BIOS:
# grub2-mkconfig -o /boot/grub2/grub.cfg
EFI:
# grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

(RHEL grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg

 

– 반영된것 확인

# ls -la /boot/grub2/../efi/EFI/redhat/grubenv

# ls -la /boot/grub2/grubenv

 

– 재부팅 후 적용 확인 (커널)

# cat /proc/cmdline

 

– EFI 사용 여부 확인

방법 1. grub. conf 의 위치

[root@Sample-local ~]# ls -la /boot/efi/EFI/redhat/grub.conf
-rwx—— 1 root root 869 2015-09-09 13:26 /boot/efi/EFI/redhat/grub.conf

[root@Sample-local ~]# ls -la /etc/grub.conf
lrwxrwxrwx. 1 root root 32 2015-09-09 13:26 /etc/grub.conf -> ../boot/efi/EFI/redhat/grub.conf

 

방법 2. efi 디렉토리 존재 유무

[root@Sample-local ~]# ll /sys/firmware
합계 0
drwxr-xr-x 4 root root 0 2015-09-09 04:52 acpi
drwxr-xr-x 3 root root 0 2015-09-09 13:27 efi
drwxr-xr-x 12 root root 0 2015-09-09 13:27 memmap

 

방법 3. dmesg 를 통한 EFI 메모리 할당 정보 확인
[root@Sample-local ~]# dmesg |grep EFI
EFI v2.30 by VMware, Inc.
EFI: mem00: type=10, attr=0xf, range=[0x0000000000000000-0x0000000000001000) (0MB)
EFI: mem01: type=7, attr=0xf, range=[0x0000000000001000-0x000000000009e000) (0MB)
EFI: mem02: type=2, attr=0xf, range=[0x000000000009e000-0x00000000000a0000) (0MB)
EFI: mem03: type=7, attr=0xf, range=[0x0000000000100000-0x000000007baa0000) (1977MB)
EFI: mem04: type=2, attr=0xf, range=[0x000000007baa0000-0x000000007d2e5000) (24MB)
EFI: mem05: type=4, attr=0xf, range=[0x000000007d2e5000-0x000000007da39000) (7MB)
EFI: mem06: type=2, attr=0xf, range=[0x000000007da39000-0x000000007de39000) (4MB)

CentOS 7, 8 grub2 설정 변경

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