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How can I allow an existing paravirtualized instance to boot from a CD-ROM image?

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up vote 1 down vote accepted

You can't do this with PV. You can always do this with HVM and then switch the vanilla kernel with a PV Xen kernel.

If you are trying to install Debian, Ubuntu, Fedora, CentOs or Gentoo, you can always use xen-tools which will do all the work for you. I believe you also have virt-install but I don't know which distributions can be installed using that.

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you can create CD /DVD on nfs or ftp then can boot from cd/dvd or you can use

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