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I read grub2 allows booting from an ISO image (at least for most live-cds). How can I add such an entry to my grub configuration? Please mention all files to modify and all commands to run since I haven't used grub2 before upgrading.

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possibly related: freenas grub2 booting iso –  Tobias Kienzler Jan 5 '11 at 15:17
    
Isn't that a duplicate? What's different about it? –  Michael Mrozek Jan 5 '11 at 15:29
    
@Michael Mrozek♦: That question doesn't state what its OP already knows about grub2, while my question is ground zero. Also I don't know if that question is specific to freenas only –  Tobias Kienzler Jan 5 '11 at 15:35
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I think this answer to Installing Grub (2) on a USB flash drive answers most of it - if it does I'll probably add an answer myself later –  Tobias Kienzler Jan 5 '11 at 15:43
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As far as I know while grub2 supports iso files and booting from CD it does not support loading systems from one yet.

cdboot module is compiled from cdboot.S which is support of booting from CD but not loading kernels (at least as of 1.98).

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