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On Thu, Aug 29, 2013 at 10:47 AM, <gottlieb@×××.edu> wrote: |
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> I want to reinstall an old system to have combined root+usr. |
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> |
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> I have always used an lvm installation guide that was a "companion" to |
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> the handbook. That is it would tell you how to augment each handbook |
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> installation chapter for lvm (actually lvm2). |
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> |
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> I can't find this documentation now on gentoo.org. There is a big wiki |
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> page, but that is different as are daniel's 2-volume "learning linux |
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> lvm". |
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> |
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> The closest I found is the raid+lvm quick install guide, but i would be |
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> happier with the one I have used often in the past. |
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> |
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> Any clues (I am emotionally prepared to learn that it is right there on |
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> the installation web page, but my eyes and search commands are |
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> deficient). |
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|
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As James said, the docs are being reorganized. However, I did a |
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systemd+LVM installation (just because I was getting tired of not |
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knowing what the fuss was all about), and (in my experience) there are |
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almost no changes from the regular installation in the handbook. |
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|
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I put everything in LVM (/, /boot, everything). From my notes, the |
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only changes are: |
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|
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From the livecd: |
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1. Use partitions, not whole disks (GRUB2 got confused when I tried to |
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use whole disks). |
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2. Set the partition type as LVM (8e in fdisk). |
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3. Create the Physical Volume, the Volume Group, and the Logical |
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Volumes as desired. |
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4. Continue the normal installation, just using /dev/vg0/lvolX (or |
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whatever names you choose). |
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|
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After the chroot and emerging the kernel package: |
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1. Se the LVM options in the kernel. Compile, install it. |
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2. Emerge systemd. |
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3. Emerge dracut (USE="device-mapper", DRACUT_MODULES="systemd lvm", at least). |
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4. Set add_dracutmodules="systemd" in /etc/dracut.conf. |
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5. Weirdly, set lvmconf="no" in /etc/dracut.conf. I didn't even |
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touched /etc/lvm/lvm.conf, so I think leaving it out makes dracut to |
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autoconfigure it. If I put lvmconf="yes", the boot hangs. Didn't |
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investigated why. |
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6. Emerge GRUB2 (USE="device-mapper mount"); I don't know if GRUB |
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works with LVM, but GRUB2 does, so I used that. |
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7. Set GRUB_PRELOAD_MODULES="lvm", |
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GRUB_CMDLINE_LINUX="init=/usr/lib/systemd/systemd", in |
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/etc/default/grub. |
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8. Generate initramfs, generate /boot/grub2/grub.cfg, install GRUB2 |
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with grub2-install. |
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9. Reboot. Everything works. |
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|
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GRUB2 handles LVM just fine, I believe, but my LVM setup was dead |
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simple (the VG was just the only partition of all my disks). |
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dracut+systemd takes care of everything else; I didn't even had to do |
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something special in fstab, since I used labels. |
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|
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To extend/reduce your Logical Volumes you will need a livecd, or a |
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more complex initramfs, though. |
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|
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Regards. |
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-- |
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Canek Peláez Valdés |
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Posgrado en Ciencia e Ingeniería de la Computación |
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Universidad Nacional Autónoma de México |
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