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On Friday, 2 March 2018 11:34:09 GMT Peter Humphrey wrote: |
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> On Friday, 2 March 2018 11:12:36 GMT Helmut Jarausch wrote: |
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> > Hi, |
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> > |
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> > I'd like to install a second Gentoo system on a partition by running |
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> > QEMU using that partition (directly) - this is to create and update a |
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> > Gentoo |
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> > system with different CFLAGS (for an older machine). |
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The QEMU guest's complete filesystem is contained within a *virtual* disk |
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image. As far as the host OS is concerned, the guest's disk with all |
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partitions on it, is a file. You can store this image file wherever you want |
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and map the QEMU on the host to launch it. |
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> > Having no experience in such setups my initial problem is how to |
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> > install grub2 on that partition (only). I don't want to modify the MBR |
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> > of the whole drive containing that partition. |
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You do not install the guest's GRUB or any other boot loader on the host's |
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partition. You install it within the virtual disk after you have launched the |
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guest having attached a LiveCD to it, using QEMU. |
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> I do the same for my Atom machine by NFS-exporting its /usr/portage to a |
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> chroot on my main machine. The question of booting doesn't arise; all that's |
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> needed is a copy of /etc/portage* and the world file. If that sounds |
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> interesting I can show you some more detail. |
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> |
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> * Things like -march and --jobs differ to suit the host machine, but that's |
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> about all. |
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As noted above you'll need to set up CFLAGS in the guest's make.conf file to |
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suit the *guest* platform and its CPU. Setting up "-march=native" won't work |
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here. |
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-- |
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Regards, |
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Mick |
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