10年前的老笔记本，运行Windows10很慢很慢，于是又安装了Centos7系统。结果安装完成Centos7后，启动时找不到Windows10的引导信息了。下面是自己的解决方案：
1. 先查看grub内的信息，没有Windows的引导信息：
1 [root@Centos7<21:31:31-10>~]# cat /boot/grub2/grub.cfg 2 # 3 # DO NOT EDIT THIS FILE 4 # 5 # It is automatically generated by grub2-mkconfig using templates 6 # from /etc/grub.d and settings from /etc/default/grub 7 # 8 9 ### BEGIN /etc/grub.d/00_header ### 10 set pager=1 11 12 if [ -s $prefix/grubenv ]; then 13 load_env 14 fi 15 if [ "${next_entry}" ] ; then 16 set default="${next_entry}" 17 set next_entry= 18 save_env next_entry 19 set boot_once=true 20 else 21 set default="${saved_entry}" 22 fi 23 24 if [ x"${feature_menuentry_id}" = xy ]; then 25 menuentry_id_option="--id" 26 else 27 menuentry_id_option="" 28 fi 29 30 export menuentry_id_option 31 32 if [ "${prev_saved_entry}" ]; then 33 set saved_entry="${prev_saved_entry}" 34 save_env saved_entry 35 set prev_saved_entry= 36 save_env prev_saved_entry 37 set boot_once=true 38 fi 39 40 function savedefault { 41 if [ -z "${boot_once}" ]; then 42 saved_entry="${chosen}" 43 save_env saved_entry 44 fi 45 } 46 47 function load_video { 48 if [ x$feature_all_video_module = xy ]; then 49 insmod all_video 50 else 51 insmod efi_gop 52 insmod efi_uga 53 insmod ieee1275_fb 54 insmod vbe 55 insmod vga 56 insmod video_bochs 57 insmod video_cirrus 58 fi 59 } 60 61 terminal_output console 62 if [ x$feature_timeout_style = xy ] ; then 63 set timeout_style=menu 64 set timeout=5 65 # Fallback normal timeout code in case the timeout_style feature is 66 # unavailable. 67 else 68 set timeout=5 69 fi 70 ### END /etc/grub.d/00_header ### 71 72 ### BEGIN /etc/grub.d/00_tuned ### 73 set tuned_params="" 74 set tuned_initrd="" 75 ### END /etc/grub.d/00_tuned ### 76 77 ### BEGIN /etc/grub.d/01_users ### 78 if [ -f ${prefix}/user.cfg ]; then 79 source ${prefix}/user.cfg 80 if [ -n "${GRUB2_PASSWORD}" ]; then 81 set superusers="root" 82 export superusers 83 password_pbkdf2 root ${GRUB2_PASSWORD} 84 fi 85 fi 86 ### END /etc/grub.d/01_users ### 87 88 ### BEGIN /etc/grub.d/10_linux ### 89 menuentry 'CentOS Linux (3.10.0-1062.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1062.el7.x86_64-advanced-8fae145c-1fb9-4762-afa7-c48c04d8476c' { 90 load_video 91 set gfxpayload=keep 92 insmod gzio 93 insmod part_msdos 94 insmod xfs 95 set root='hd0,msdos9' 96 if [ x$feature_platform_search_hint = xy ]; then 97 search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos9 --hint-efi=hd1,msdos9 --hint-baremetal=ahci1,msdos9 --hint='hd0,msdos9' 5db9c979-11bb-4030-8022-7a5dba6ad8a0 98 else 99 search --no-floppy --fs-uuid --set=root 5db9c979-11bb-4030-8022-7a5dba6ad8a0 100 fi 101 linux16 /vmlinuz-3.10.0-1062.el7.x86_64 root=/dev/mapper/centos_centos7-root ro crashkernel=auto rd.lvm.lv=centos_centos7/root rd.lvm.lv=centos_centos7/swap rhgb quiet LANG=zh_CN.UTF-8 102 initrd16 /initramfs-3.10.0-1062.el7.x86_64.img 103 } 104 menuentry 'CentOS Linux (0-rescue-02975b1e6081413ba80897bf0600a07e) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-02975b1e6081413ba80897bf0600a07e-advanced-8fae145c-1fb9-4762-afa7-c48c04d8476c' { 105 load_video 106 insmod gzio 107 insmod part_msdos 108 insmod xfs 109 set root='hd0,msdos9' 110 if [ x$feature_platform_search_hint = xy ]; then 111 search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos9 --hint-efi=hd1,msdos9 --hint-baremetal=ahci1,msdos9 --hint='hd0,msdos9' 5db9c979-11bb-4030-8022-7a5dba6ad8a0 112 else 113 search --no-floppy --fs-uuid --set=root 5db9c979-11bb-4030-8022-7a5dba6ad8a0 114 fi 115 linux16 /vmlinuz-0-rescue-02975b1e6081413ba80897bf0600a07e root=/dev/mapper/centos_centos7-root ro crashkernel=auto rd.lvm.lv=centos_centos7/root rd.lvm.lv=centos_centos7/swap rhgb quiet 116 initrd16 /initramfs-0-rescue-02975b1e6081413ba80897bf0600a07e.img 117 } 118 119 ### END /etc/grub.d/10_linux ### 120 121 ### BEGIN /etc/grub.d/20_linux_xen ### 122 ### END /etc/grub.d/20_linux_xen ### 123 124 ### BEGIN /etc/grub.d/20_ppc_terminfo ### 125 ### END /etc/grub.d/20_ppc_terminfo ### 126 127 ### BEGIN /etc/grub.d/30_os-prober ### 128 ### END /etc/grub.d/30_os-prober ### 129 130 ### BEGIN /etc/grub.d/40_custom ### 131 # This file provides an easy way to add custom menu entries. Simply type the 132 # menu entries you want to add after this comment. Be careful not to change 133 # the 'exec tail' line above. 134 ### END /etc/grub.d/40_custom ### 135 136 ### BEGIN /etc/grub.d/41_custom ### 137 if [ -f ${config_directory}/custom.cfg ]; then 138 source ${config_directory}/custom.cfg 139 elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then 140 source $prefix/custom.cfg; 141 fi 142 ### END /etc/grub.d/41_custom ###
2. 搜索epel并安装
1 [root@Centos7<21:13:54-2>~]# yum search epel 2 已加载插件：fastestmirror, langpacks 3 Loading mirror speeds from cached hostfile 4 * base: mirrors.cqu.edu.cn 5 * extras: mirrors.aliyun.com 6 * updates: mirrors.cqu.edu.cn 7 ========================================================== N/S matched: epel ========================================================== 8 epel-release.noarch : Extra Packages for Enterprise Linux repository configuration 9 10 名称和简介匹配 only，使用“search all”试试。 11 [root@Centos7<21:14:47-3>~]# yum -y install epel-release.noarch 12 已加载插件：fastestmirror, langpacks 13 Loading mirror speeds from cached hostfile 14 * base: mirrors.cqu.edu.cn 15 * extras: mirrors.aliyun.com 16 * updates: mirrors.cqu.edu.cn 17 正在解决依赖关系 18 --> 正在检查事务 19 ---> 软件包 epel-release.noarch.0.7-11 将被 安装 20 --> 解决依赖关系完成 21 22 依赖关系解决 23 24 ======================================================================================================================================= 25 Package 架构 版本 源 大小 26 ======================================================================================================================================= 27 正在安装: 28 epel-release noarch 7-11 extras 15 k 29 30 事务概要 31 ======================================================================================================================================= 32 安装 1 软件包 33 34 总下载量：15 k 35 安装大小：24 k 36 Downloading packages: 37 epel-release-7-11.noarch.rpm | 15 kB 00:00:00 38 Running transaction check 39 Running transaction test 40 Transaction test succeeded 41 Running transaction 42 正在安装 : epel-release-7-11.noarch 1/1 43 验证中 : epel-release-7-11.noarch 1/1 44 45 已安装: 46 epel-release.noarch 0:7-11 47 48 完毕！
3. 安装ntfs-3g
1 [root@Centos7<21:15:17-4>~]# yum -y install ntfs-3g 2 已加载插件：fastestmirror, langpacks 3 Loading mirror speeds from cached hostfile 4 epel/x86_64/metalink | 5.0 kB 00:00:00 5 * base: mirrors.cqu.edu.cn 6 * epel: ftp.yz.yamagata-u.ac.jp 7 * extras: mirrors.aliyun.com 8 * updates: mirrors.cqu.edu.cn 9 epel | 5.3 kB 00:00:00 10 (1/3): epel/x86_64/group_gz | 90 kB 00:00:05 11 (2/3): epel/x86_64/updateinfo | 1.0 MB 00:01:32 12 (3/3): epel/x86_64/primary_db | 6.9 MB 00:06:11 13 正在解决依赖关系 14 --> 正在检查事务 15 ---> 软件包 ntfs-3g.x86_64.2.2017.3.23-11.el7 将被 安装 16 --> 解决依赖关系完成 17 18 依赖关系解决 19 20 ======================================================================================================================================= 21 Package 架构 版本 源 大小 22 ======================================================================================================================================= 23 正在安装: 24 ntfs-3g x86_64 2:2017.3.23-11.el7 epel 265 k 25 26 事务概要 27 ======================================================================================================================================= 28 安装 1 软件包 29 30 总下载量：265 k 31 安装大小：612 k 32 Downloading packages: 33 警告：/var/cache/yum/x86_64/7/epel/packages/ntfs-3g-2017.3.23-11.el7.x86_64.rpm: 头V3 RSA/SHA256 Signature, 密钥 ID 352c64e5: NOKEYETA 34 ntfs-3g-2017.3.23-11.el7.x86_64.rpm 的公钥尚未安装 35 ntfs-3g-2017.3.23-11.el7.x86_64.rpm | 265 kB 00:00:57 36 从 file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7 检索密钥 37 导入 GPG key 0x352C64E5: 38 用户ID : "Fedora EPEL (7) <epel@fedoraproject.org>" 39 指纹 : 91e9 7d7c 4a5e 96f1 7f3e 888f 6a2f aea2 352c 64e5 40 软件包 : epel-release-7-11.noarch (@extras) 41 来自 : /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7 42 Running transaction check 43 Running transaction test 44 Transaction test succeeded 45 Running transaction 46 正在安装 : 2:ntfs-3g-2017.3.23-11.el7.x86_64 1/1 47 验证中 : 2:ntfs-3g-2017.3.23-11.el7.x86_64 1/1 48 49 已安装: 50 ntfs-3g.x86_64 2:2017.3.23-11.el7 51 52 完毕！
4. 重新建立grub.cfg文件，这个过程中会自动搜索到Windows10并将其添加进去
1 [root@Centos7<21:36:17-11>~]# grub2-mkconfig -o /boot/grub2/grub.cfg 2 Generating grub configuration file ... 3 Found linux image: /boot/vmlinuz-3.10.0-1062.el7.x86_64 4 Found initrd image: /boot/initramfs-3.10.0-1062.el7.x86_64.img 5 Found linux image: /boot/vmlinuz-0-rescue-02975b1e6081413ba80897bf0600a07e 6 Found initrd image: /boot/initramfs-0-rescue-02975b1e6081413ba80897bf0600a07e.img 7 Found Windows 10 (loader) on /dev/sda1 8 done
1 [root@Centos7<21:38:05-12>~]# grub2catt/grub2/grub.cfg 2 # 3 # DO NOT EDIT THIS FILE 4 # 5 # It is automatically generated by grub2-mkconfig using templates 6 # from /etc/grub.d and settings from /etc/default/grub 7 # 8 9 ### BEGIN /etc/grub.d/00_header ### 10 set pager=1 11 12 if [ -s $prefix/grubenv ]; then 13 load_env 14 fi 15 if [ "${next_entry}" ] ; then 16 set default="${next_entry}" 17 set next_entry= 18 save_env next_entry 19 set boot_once=true 20 else 21 set default="${saved_entry}" 22 fi 23 24 if [ x"${feature_menuentry_id}" = xy ]; then 25 menuentry_id_option="--id" 26 else 27 menuentry_id_option="" 28 fi 29 30 export menuentry_id_option 31 32 if [ "${prev_saved_entry}" ]; then 33 set saved_entry="${prev_saved_entry}" 34 save_env saved_entry 35 set prev_saved_entry= 36 save_env prev_saved_entry 37 set boot_once=true 38 fi 39 40 function savedefault { 41 if [ -z "${boot_once}" ]; then 42 saved_entry="${chosen}" 43 save_env saved_entry 44 fi 45 } 46 47 function load_video { 48 if [ x$feature_all_video_module = xy ]; then 49 insmod all_video 50 else 51 insmod efi_gop 52 insmod efi_uga 53 insmod ieee1275_fb 54 insmod vbe 55 insmod vga 56 insmod video_bochs 57 insmod video_cirrus 58 fi 59 } 60 61 terminal_output console 62 if [ x$feature_timeout_style = xy ] ; then 63 set timeout_style=menu 64 set timeout=5 65 # Fallback normal timeout code in case the timeout_style feature is 66 # unavailable. 67 else 68 set timeout=5 69 fi 70 ### END /etc/grub.d/00_header ### 71 72 ### BEGIN /etc/grub.d/00_tuned ### 73 set tuned_params="" 74 set tuned_initrd="" 75 ### END /etc/grub.d/00_tuned ### 76 77 ### BEGIN /etc/grub.d/01_users ### 78 if [ -f ${prefix}/user.cfg ]; then 79 source ${prefix}/user.cfg 80 if [ -n "${GRUB2_PASSWORD}" ]; then 81 set superusers="root" 82 export superusers 83 password_pbkdf2 root ${GRUB2_PASSWORD} 84 fi 85 fi 86 ### END /etc/grub.d/01_users ### 87 88 ### BEGIN /etc/grub.d/10_linux ### 89 menuentry 'CentOS Linux (3.10.0-1062.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1062.el7.x86_64-advanced-8fae145c-1fb9-4762-afa7-c48c04d8476c' { 90 load_video 91 set gfxpayload=keep 92 insmod gzio 93 insmod part_msdos 94 insmod xfs 95 set root='hd0,msdos9' 96 if [ x$feature_platform_search_hint = xy ]; then 97 search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos9 --hint-efi=hd0,msdos9 --hint-baremetal=ahci0,msdos9 5db9c979-11bb-4030-8022-7a5dba6ad8a0 98 else 99 search --no-floppy --fs-uuid --set=root 5db9c979-11bb-4030-8022-7a5dba6ad8a0 100 fi 101 linux16 /vmlinuz-3.10.0-1062.el7.x86_64 root=/dev/mapper/centos_centos7-root ro crashkernel=auto rd.lvm.lv=centos_centos7/root rd.lvm.lv=centos_centos7/swap rhgb quiet 102 initrd16 /initramfs-3.10.0-1062.el7.x86_64.img 103 } 104 menuentry 'CentOS Linux (0-rescue-02975b1e6081413ba80897bf0600a07e) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-02975b1e6081413ba80897bf0600a07e-advanced-8fae145c-1fb9-4762-afa7-c48c04d8476c' { 105 load_video 106 insmod gzio 107 insmod part_msdos 108 insmod xfs 109 set root='hd0,msdos9' 110 if [ x$feature_platform_search_hint = xy ]; then 111 search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos9 --hint-efi=hd0,msdos9 --hint-baremetal=ahci0,msdos9 5db9c979-11bb-4030-8022-7a5dba6ad8a0 112 else 113 search --no-floppy --fs-uuid --set=root 5db9c979-11bb-4030-8022-7a5dba6ad8a0 114 fi 115 linux16 /vmlinuz-0-rescue-02975b1e6081413ba80897bf0600a07e root=/dev/mapper/centos_centos7-root ro crashkernel=auto rd.lvm.lv=centos_centos7/root rd.lvm.lv=centos_centos7/swap rhgb quiet 116 initrd16 /initramfs-0-rescue-02975b1e6081413ba80897bf0600a07e.img 117 } 118 if [ "x$default" = 'CentOS Linux (3.10.0-1062.el7.x86_64) 7 (Core)' ]; then default='Advanced options for CentOS Linux>CentOS Linux (3.10.0-1062.el7.x86_64) 7 (Core)'; fi; 119 ### END /etc/grub.d/10_linux ### 120 121 ### BEGIN /etc/grub.d/20_linux_xen ### 122 ### END /etc/grub.d/20_linux_xen ### 123 124 ### BEGIN /etc/grub.d/20_ppc_terminfo ### 125 ### END /etc/grub.d/20_ppc_terminfo ### 126 127 ### BEGIN /etc/grub.d/30_os-prober ### 128 menuentry 'Windows 10 (loader) (on /dev/sda1)' --class windows --class os $menuentry_id_option 'osprober-chain-D440386240384D8C' { 129 insmod part_msdos 130 insmod ntfs 131 set root='hd0,msdos1' 132 if [ x$feature_platform_search_hint = xy ]; then 133 search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 D440386240384D8C 134 else 135 search --no-floppy --fs-uuid --set=root D440386240384D8C 136 fi 137 parttool ${root} hidden- 138 drivemap -s (hd0) ${root} 139 chainloader +1 140 } 141 ### END /etc/grub.d/30_os-prober ### 142 143 ### BEGIN /etc/grub.d/40_custom ### 144 # This file provides an easy way to add custom menu entries. Simply type the 145 # menu entries you want to add after this comment. Be careful not to change 146 # the 'exec tail' line above. 147 ### END /etc/grub.d/40_custom ### 148 149 ### BEGIN /etc/grub.d/41_custom ### 150 if [ -f ${config_directory}/custom.cfg ]; then 151 source ${config_directory}/custom.cfg 152 elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then 153 source $prefix/custom.cfg; 154 fi 155 ### END /etc/grub.d/41_custom ###
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