安装Centos7后，启动时不显示Windows 7。 Centos 7 可以访问。
我的启动文件夹条目：
[root@localhost boot]# ls -ltr
total 89176
-rw-------. 1 root root 2840084 Jun 30 07:17 System.map-3.10.0-123.el7.x86_64
-rw-r--r--. 1 root root 122059 Jun 30 07:17 config-3.10.0-123.el7.x86_64
-rwxr-xr-x. 1 root root 4902656 Jun 30 07:17 vmlinuz-3.10.0-123.el7.x86_64
-rw-r--r--. 1 root root 228562 Jun 30 07:20 symvers-3.10.0-123.el7.x86_64.gz
drwxr-xr-x. 2 root root 4096 Nov 21 05:27 extlinux
drwxr-xr-x. 2 root root 26 Nov 21 05:28 grub
-rw-r--r--. 1 root root 867424 Nov 21 05:38 initrd-plymouth.img
-rw-r--r--. 1 root root 42219459 Nov 21 05:39 initramfs-0-rescue-4d161cb1c811459b927aed6f75f7deed.img
-rwxr-xr-x. 1 root root 4902656 Nov 21 05:39 vmlinuz-0-rescue-4d161cb1c811459b927aed6f75f7deed
-rw-r--r--. 1 root root 17637360 Nov 21 05:40 initramfs-3.10.0-123.el7.x86_64.img
-rw-r--r--. 1 root root 17584068 Nov 21 11:59 initramfs-3.10.0-123.el7.x86_64kdump.img
drwxr-xr-x. 6 root root 104 Nov 25 02:52 grub2
fdisk -l 输出
[root@localhost boot]# fdisk -l
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
Disk /dev/sda: 250.1 GB, 250059350016 bytes, 488397168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: gpt
# Start End Size Type Name
1 2048 206847 100M EFI System EFI system partition
2 206848 468991 128M Microsoft reser Microsoft reserved partition
3 468992 348162047 165.8G Microsoft basic Basic data partition
4 348162048 348164095 1M BIOS boot parti
5 348164096 349188095 500M Microsoft basic
6 349188096 488396799 66.4G Linux LVM
Disk /dev/mapper/centos-swap: 8262 MB, 8262778880 bytes, 16138240 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-root: 42.3 GB, 42341498880 bytes, 82698240 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-home: 20.7 GB, 20669530112 bytes, 40370176 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
黑屏输出
[root@localhost boot]# bklid
bash: bklid: command not found...
Similar command is: 'blkid'
[root@localhost boot]# blkid
/dev/sr0: UUID="2011-04-12-02-38-58-00" LABEL="GSP1RMCPRXFRER_EN_DVD" TYPE="udf"
/dev/sda1: UUID="20DD-5268" TYPE="vfat" PARTLABEL="EFI system partition" PARTUUID="ef67b4eb-4514-4824-a1ba-d8d045e96f26"
/dev/sda3: UUID="EAD6EA4AD6EA169B" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="fa8c0ee9-2913-45ec-b016-0c6eb2e4aab8"
/dev/sda5: UUID="368a42d5-e9f9-4c81-81e2-70afe2344b6b" TYPE="xfs" PARTUUID="7447a676-d39b-46fc-948b-f1c4a3b4bf9c"
/dev/sda6: UUID="VfFTVf-Rdy5-kLFT-Zyys-PIEf-PnOo-gSZfLZ" TYPE="LVM2_member" PARTUUID="b2677b42-22fb-42f8-a287-77ad0638b674"
/dev/mapper/centos-swap: UUID="155e4385-547c-4c0b-94bd-13882f078548" TYPE="swap"
/dev/dm-2: UUID="a4709eae-75fd-4423-8f11-64762df974df" TYPE="xfs"
/dev/dm-1: UUID="24a077fa-6b00-4da0-9d07-34048d84d853" TYPE="xfs"
grub2-mkconfig -o /boot/grub2/grub.cfg 命令输出
[root@localhost boot]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-123.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-123.el7.x86_64.img
Warning: Please don't use old title `CentOS Linux, with Linux 3.10.0-123.el7.x86_64' for GRUB_DEFAULT, use `Advanced options for CentOS Linux>CentOS Linux, with Linux 3.10.0-123.el7.x86_64' (for versions before 2.00) or `gnulinux-advanced-24a077fa-6b00-4da0-9d07-34048d84d853>gnulinux-3.10.0-123.el7.x86_64-advanced-24a077fa-6b00-4da0-9d07-34048d84d853' (for 2.00 or later)
Found linux image: /boot/vmlinuz-0-rescue-4d161cb1c811459b927aed6f75f7deed
Found initrd image: /boot/initramfs-0-rescue-4d161cb1c811459b927aed6f75f7deed.img
done
这是/boot/grub2/grub.cfg的内容
#
# 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/10_linux ###
menuentry 'CentOS Linux, with Linux 3.10.0-123.el7.x86_64' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-123.el7.x86_64-advanced-24a077fa-6b00-4da0-9d07-34048d84d853' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod xfs
set root='hd0,gpt5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt5 --hint-efi=hd0,gpt5 --hint-baremetal=ahci0,gpt5 --hint='hd0,gpt5' 368a42d5-e9f9-4c81-81e2-70afe2344b6b
else
search --no-floppy --fs-uuid --set=root 368a42d5-e9f9-4c81-81e2-70afe2344b6b
fi
linux16 /vmlinuz-3.10.0-123.el7.x86_64 root=UUID=24a077fa-6b00-4da0-9d07-34048d84d853 ro rd.lvm.lv=centos/swap vconsole.font=latarcyrheb-sun16 rd.lvm.lv=centos/root crashkernel=auto vconsole.keymap=us rhgb quiet
initrd16 /initramfs-3.10.0-123.el7.x86_64.img
}
menuentry 'CentOS Linux, with Linux 0-rescue-4d161cb1c811459b927aed6f75f7deed' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-4d161cb1c811459b927aed6f75f7deed-advanced-24a077fa-6b00-4da0-9d07-34048d84d853' {
load_video
insmod gzio
insmod part_gpt
insmod xfs
set root='hd0,gpt5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt5 --hint-efi=hd0,gpt5 --hint-baremetal=ahci0,gpt5 --hint='hd0,gpt5' 368a42d5-e9f9-4c81-81e2-70afe2344b6b
else
search --no-floppy --fs-uuid --set=root 368a42d5-e9f9-4c81-81e2-70afe2344b6b
fi
linux16 /vmlinuz-0-rescue-4d161cb1c811459b927aed6f75f7deed root=UUID=24a077fa-6b00-4da0-9d07-34048d84d853 ro rd.lvm.lv=centos/swap vconsole.font=latarcyrheb-sun16 rd.lvm.lv=centos/root crashkernel=auto vconsole.keymap=us rhgb quiet
initrd16 /initramfs-0-rescue-4d161cb1c811459b927aed6f75f7deed.img
}
if [ "x$default" = 'CentOS Linux, with Linux 3.10.0-123.el7.x86_64' ]; then default='Advanced options for CentOS Linux>CentOS Linux, with Linux 3.10.0-123.el7.x86_64'; fi;
### 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 ###
我尝试将以下条目添加到 40_custom 并运行“grub2-mkconfig -o /boot/grub2/grub.cfg”，但在输出中找不到窗口。该条目显示在启动菜单中，但单击时会出现错误“Missing BOOTMGR”。
menuentry 'Windows 7 (loader) (on /dev/sda3)' --class windows --class os $menuentry_id_option 'osprober-chain-EAD6EA4AD6EA169B' {
insmod part_gpt
insmod ntfs
set root='hd0,gpt3'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root –hint-bios=hd0,gpt3 --hint-efi=hd0,gpt3 --hint-baremetal=ahci1, gpt3 EAD6EA4AD6EA169B
else
search --no-floppy --fs-uuid --set=root EAD6EA4AD6EA169B
fi
chainloader +1
}
