Boot livecd ISO from HDD
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With grub2, you can easily boot a livecd image from your hard drive.
General guide
Note
This is general example. It may not work with all livecds.
1. Copy the iso image to root folder for simplicity:
root # cp /home/user/downloads/systemrescuecd.iso /src.iso
2. Reboot and when grub2 loads press 'c' for console. Run the following commands (tab autocompletion is your friend):
loopback loop (hd0,2)/src.iso linux (loop)/boot/vmlinuz initrd (loop)/boot/initrd.lz boot