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Centos 7/Windows 7 Dual Boot Problem

Posted on 2014-09-13
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Last Modified: 2014-09-18
I have installed Centos 7 as a dual boot on my Windows 7 laptop.  Centos 7 installed successfully; however, when i reboot, I do not have an option to boot to my Windows 7 partition.  I instead get a list of various Centos systems to boot.  When i first installed Centos, the boot showed 3 flavors of Centos I could boot.  After I ran software update, the boot showed 4 options, with the main option have "(core) listed - but still no Windows 7.  The interface looks more like MBR vice grub
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Question by:DCCoolBreeze
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6 Comments
 
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Expert Comment

by:gheist
ID: 40320870
You need to tweak grub2 configuration to detect other OS partitions.
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Expert Comment

by:David Johnson, CD, MVP
ID: 40320888
did you select grub on the installation .. what steps did you use?
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Author Comment

by:DCCoolBreeze
ID: 40321005
Thanks for commenting... the installation never asked about grub.  i now know that grub2 is the boot loader.  I still have not figured out how to get the windows option loaded in grub2.
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DCCoolBreeze earned 0 total points
ID: 40321020
I was able to solve the problem.  Centos loaded grub2 as the boot loader.  My windows 7 partition was intact, but not seen by grub2.  So I had to manually add windows 7.  To do this i did the following:

su -

#gedit /etc/grub.d/06_custom

#! /bin/sh -e
echo "Adding custom boot entry(s)" >&2
 cat << EOF
menuentry "Chainload Windows 7" {
    set root=(hd0,msdos1)
    chainloader +1  
}
EOF

#chmod 755 /etc/grub.d/06_custom

#grub2-mkconfig -o /boot/grub2/grub.cfg

i found this information on http://members.iinet.net/~herman546/p20/GRUB2%20Configuration%20File%20Commands.html

I just changed the last line to reflect grub2 (#grub2-mkconfig -o /boot/grub2/grub.cfg)
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Expert Comment

by:gheist
ID: 40321022
You need to add something to /etc/sysconfig/grub, but i dont know what...
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Author Closing Comment

by:DCCoolBreeze
ID: 40329901
it worked!
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