> Sent: Sunday, October 27, 2019 at 3:20 AM
> From: "Pierre Labastie via blfs-support"
> <blfs-support@lists.linuxfromscratch.org>
> To: blfs-support@lists.linuxfromscratch.org
> Cc: "Pierre Labastie" <pierre.labas...@neuf.fr>
> Subject: Re: [blfs-support] Best approach for lvm2
>
> On 26/10/2019 14:46, Christopher Gregory via blfs-support wrote:
> > Hello,
> >
> > I am about to install another version of lfs/blfs on a new ssd hard drive,
> > and I am wanting to move all my drives to using lvm2. What I need to know
> > is the best approach for this. I understand that it needs to happen at the
> > partitioning stage of installing lfs.
> >
> > I was wondering if I used a distro such as fedora from a live dvd if I
> > would be able to achieve this on the new hard drive and then be able to use
> > jhalf as normal to install lfs. I was hoping to avoid having to have a
> > seperate /boot and having to use an initramfs image if at all possible, but
> > do not know if this would be achieveable or not.
> >
> > I am wanting to continue using guid partitions as well. I have not seen
> > antyhing on the lists that show that anyone has been able to install lfs on
> > an lvm2 controlled drive.
> >
>
> Maybe I've not communicated much on it, by I have done that :) here is the
> partition layout (you can have something simpler, but I need Windows [1] for
> my job). Note that there is nothing special with dos partitioning, and
> certainly gpt is OK:
>
> Device Boot Start End Sectors Size Id Type
> /dev/sda1 * 2048 2101247 2099200 1G 7 HPFS/NTFS/exFAT
> /dev/sda2 2101248 197413747 195312500 93.1G 7 HPFS/NTFS/exFAT
> /dev/sda3 197414910 620937215 423522306 202G 5 Extended
> /dev/sda4 620937216 625131519 4194304 2G b W95 FAT32
> /dev/sda5 197414912 620937215 423522304 202G 8e Linux LVM
>
> Now, the lvm layout is:
> /dev/mapper/vg-debian64: 37.26 GiB
> /dev/mapper/vg-swap: 7.46 GiB
> /dev/mapper/vg-home: 37.26 GiB
> /dev/mapper/vg-lfs: 60 GiB
>
> I first installed debian on /dev/mapper/vg-debian64, mounting
> /dev/mapper/vg-home on /home. Actually, I used the partitioning tool coming
> with the debian installer to shrink the NTFS partition and create the lvm
> setup. I installed grub onto the disk. Grub can perfectly well boot from an
> lvm partition.
>
> From debian, I mounted /dev/vg/lfs on /mnt/lfs, and installed lfs on it. Then
> I made an initramfs. The reason why it _is_ needed (no way without it, unless
> you have the root filesystem on a regular partition) is because the kernel
> does not know about lvm, so it needs some help to be able to mount an lvm root
> partition. The initramfs in the book works well for lvm.
>
> I created /boot/grub/grub.cfg on /dev/vg/lfs with
>
> # Begin /boot/grub/grub.cfg
> set default=0
> set timeout=5
>
> insmod ext2
> insmod lvm
> set root='lvm/vg/lfs'
>
> menuentry "GNU/Linux, Linux 5.3.6-lfs-SVN-20191017" {
> linux /boot/vmlinuz-5.3.6-lfs-SVN-20191017 root=/dev/vg/lfs ro quiet
> initrd /boot/microcode.img /boot/initrd.img-no-kmods
> }
> ...
>
> Then I ran update-grub on debian. There is a small problem here: update-grub
> only copies the first initrd, so I had to manually add the second to
> /boot/grub.gfg on /dev/vg/debian. Actually, It'd be better to merge both
> initramfs.
>
> And that's it.
>
> Pierre
> [1] I am not sure why Windows is using two small partitions + one big, but the
> computer came with that, and I just shrank the big partition to make room for
> linux.
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Hello Pierre,
I have finally got round to attempting this, and have spent a couple of days
now trying to get it to work.
I used Fedora 31 (as I am working with a developer to package his software in
rpm format) to create the lvm and the volumes. This went well. I then used
jhalfs to build the lfs system, and I got a completed install. I then went
ahead and added the entries to grub, and then the true nightmare began. No
matter what I put in the grub.cfg file it just refuses to find the kernel. I
have generated the initrd.img-no-kmods using the script in the book. Using
this script, it complains that there is a missing operand after
tmp/filename/lib but proceeds and completes the image.
I have no idea where you got the root=/dev/vg line from.
With my installation, I have rootvg in /dev with the following: (this is on
fedora 31)
lrwxrwxrwx. 1 root root 7 Nov 5 17:17 home -> ../dm-4
lrwxrwxrwx. 1 root root 7 Nov 5 17:17 opt -> ../dm-6
lrwxrwxrwx. 1 root root 7 Nov 5 17:17 root -> ../dm-7
lrwxrwxrwx. 1 root root 7 Nov 5 17:17 swap -> ../dm-3
lrwxrwxrwx. 1 root root 7 Nov 5 17:17 tmp -> ../dm-5
root [ /dev/rootvg ]# vgdisplay
--- Volume group ---
VG Name fedora_localhost-live
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size <464.76 GiB
PE Size 4.00 MiB
Total PE 118978
Alloc PE / Size 118978 / <464.76 GiB
Free PE / Size 0 / 0
VG UUID VbdXPM-nzJY-gQ1I-IbpW-N2NP-Ct5G-vKYL10
--- Volume group ---
VG Name rootvg
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 5
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size <222.59 GiB
PE Size 4.00 MiB
Total PE 56983
Alloc PE / Size 56983 / <222.59 GiB
Free PE / Size 0 / 0
VG UUID 7MAzgc-XlQZ-C53H-pKF8-ReV0-NaM2-ADSQQy
It does not matter if I use root=(lvm/rootvg-root) or /dev/mapper/rootvg-root
or any other varient, it complains that it can not find
vmlinuz-5.3.6-lfs-20191101-systemd.
I have even tried using UUID= and PARTUUID= with similar results.
I have a seperate /boot partition outside of the lvm, and a bios_grub (as I am
using guid partition) this is the way that Fedora sets things up, ie with a
seperate /boot. Even with updating grub on fedora, it still will not boot. I
have appended /boot to both the initrd file and the linux line.
After I had completed the installation of lfs, I proceeded to login to the
chroot and set the password for root, then I installed lvm2 and the script to
make the initramfs along with the runtime required files. This is the stage
that I am at now.
I am at a loss as to what is going wrong here. Fedora 31 is installed on an
external usb hard drive. I have three hard drives installed in my computer,
two of which are ssd drives.
Regards,
Christopher.
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