[SOLVED] How to add windows entry to grub in Redhat linux 7

mvikramreddy92 · 09-29-2014, 03:52 AM

Hi guys, I have installed Redhat 7 yesterday to learn about it as I require it in my VLSI LOGIC DESIGN course. But windows entry is not appearing in the grub2. so far, I've tried the following methods but failed:

1)

Code:

vi 15_Windows

cat 15_Windows
#!bin sh -e
echo "Adding Windows" >&2
cat <<EOF
menuentry "Windows 7 (loader) (on /dev/sda1)" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos1)'
chainloader +1
}
EOF

grub2-mkconfig -o /boot/grub2/grub2.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
Found linux image: /boot/vmlinuz-0-rescue-87b68a1785024296b22d609cd9c8d6db
Found initrd image: /boot/initramfs-0-rescue-87b68a1785024296b22d609cd9c8d6db.img
/usr/sbin/grub2-mkconfig: /etc/grub.d/15_Windows: bin: bad interpreter: No such file or directory

2) From procedure given in https://access.redhat.com/documentat...ng_a_new_Entry

Code:

cat /boot/grub2/grub.cfg> /etc/grub.d/40_custom

Then deleted all that's not required in 40_custom (asked to delete in the website) and added the following at the end of that:

Code:

#! /bin/sh -e
echo "Adding Windows" >&2
cat << EOF
menuentry "Windows" {
set root=(hd0,1)
chainloader +1
}
EOF

Then deleted all the files in grub.d except 0_header 40_custom and README (mentioned in the website)
Then did "chmod x" to this file and ran grub2-mkconfig -o /boot/grub2/grub.cfg
But I get some errors like "no command", "syntax errors" etc

For reference, here is my grub.cfg file:

Code:

         #
# 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 'Red Hat Enterprise Linux Workstation, with Linux 3.10.0-123.el7.x86_64' --class red --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-123.el7.x86_64-advanced-4a6c5451-605e-413d-b625-10770e12c372' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_msdos
        insmod xfs
        set root='hd0,msdos8'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos8 --hint-efi=hd0,msdos8 --hint-baremetal=ahci0,msdos8 --hint='hd0,msdos8'  ea043568-a806-49c0-8a4f-38b3e9c41abf
        else
          search --no-floppy --fs-uuid --set=root ea043568-a806-49c0-8a4f-38b3e9c41abf
        fi
 linux16 /vmlinuz-3.10.0-123.el7.x86_64 root=UUID=4a6c5451-605e-413d-b625-10770e12c372 ro rd.lvm.lv=rhel/root crashkernel=auto  rd.lvm.lv=rhel/swap vconsole.font=latarcyrheb-sun16 vconsole.keymap=us rhgb quiet
        initrd16 /initramfs-3.10.0-123.el7.x86_64.img
}
menuentry 'Red Hat Enterprise Linux Workstation, with Linux 0-rescue-87b68a1785024296b22d609cd9c8d6db' --class red --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-87b68a1785024296b22d609cd9c8d6db-advanced-4a6c5451-605e-413d-b625-10770e12c372' {
        load_video
        insmod gzio
        insmod part_msdos
        insmod xfs
        set root='hd0,msdos8'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos8 --hint-efi=hd0,msdos8 --hint-baremetal=ahci0,msdos8 --hint='hd0,msdos8'  ea043568-a806-49c0-8a4f-38b3e9c41abf
        else
          search --no-floppy --fs-uuid --set=root ea043568-a806-49c0-8a4f-38b3e9c41abf
        fi
linux16 /vmlinuz-0-rescue-87b68a1785024296b22d609cd9c8d6db root=UUID=4a6c5451-605e-413d-b625-10770e12c372 ro rd.lvm.lv=rhel/root crashkernel=auto  rd.lvm.lv=rhel/swap vconsole.font=latarcyrheb-sun16 vconsole.keymap=us rhgb quiet
        initrd16 /initramfs-0-rescue-87b68a1785024296b22d609cd9c8d6db.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/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 ###

Can anyone please guide me as I have to do this urgently?

EDIT:SOLVED

First I installed ntfs-3g package and then I followed this procedure from here and the entry is added now:
https://access.redhat.com/documentat...nstall_Command

After reinstalling, this was the code I found in grub.cfg:

Code:

### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Windows 8 (loader) (on /dev/sda1)' --class windows --class os $menuentry_id_option 'osprober-chain-903065DF3065CCB2' {
        insmod part_msdos
        insmod ntfs
        set root='hd0,msdos1'
        if [ x$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'  903065DF3065CCB2
        else
          search --no-floppy --fs-uuid --set=root 903065DF3065CCB2
        fi
        drivemap -s (hd0) ${root}
        chainloader +1
}
### END /etc/grub.d/30_os-prober ###

yancek · 09-29-2014, 11:52 AM

You neglected to indicate if you are using UEFI or BIOS mode to boot. If you are using BIOS mode, simple login as root and open a text editor and copy the entry you have in your first post (shown below) to the 40_custom file in the /etc/grub.d/directory. That is if your windows boot files are actually on that partition, sda1.

Code:

menuentry "Windows 7 (loader) (on /dev/sda1)" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos1)'
chainloader +1
}

Then as root run the "grub2-mkconfig..." command you show in your post. When you reboot, you should see the windows 7 entry.

If you are using UEFI, this won't work but you haven't said?

If you actually posted the entire grub.cfg file, I don't see how you could boot anything since you don't show any full menuentries. If the above doesn't work, you might google bootinfoscript, download and run it and post the output, a results.txt file which will give more detailed information.

mvikramreddy92 · 09-30-2014, 12:15 PM

Quote:

Originally Posted by yancek

You neglected to indicate if you are using UEFI or BIOS mode to boot. If you are using BIOS mode, simple login as root and open a text editor and copy the entry you have in your first post (shown below) to the 40_custom file in the /etc/grub.d/directory. That is if your windows boot files are actually on that partition, sda1.

Code:

menuentry "Windows 7 (loader) (on /dev/sda1)" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos1)'
chainloader +1
}

Then as root run the "grub2-mkconfig..." command you show in your post. When you reboot, you should see the windows 7 entry.

If you are using UEFI, this won't work but you haven't said?

If you actually posted the entire grub.cfg file, I don't see how you could boot anything since you don't show any full menuentries. If the above doesn't work, you might google bootinfoscript, download and run it and post the output, a results.txt file which will give more detailed information.

I added partial grub.cfg before by mistake. I have posted the actual grub.cfg now.
Anyway I have solved my issue. Thanks.