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lyallp
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Joined: 15 Jul 2004
Posts: 1557
Location: Adelaide/Australia
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 Posted: Fri Apr 07, 2017 4:21 am Post subject: [Partly Solved] grub boot - fail to find root fs by UUID |
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My system boots just fine if I have root=/dev/sdb4 on the vmlinuz lines but if I have my UUID or PARTUUID, it fails to find them
Once the kernel is up and running, all the filesystems mount using UUID, LABEL or PARTUUID just fine, it's only during boot.
Suggestions welcomed.
This is my physical config
| Code: | # lsblk --output NAME,SIZE,RO,TYPE,MOUNTPOINT,PARTLABEL,UUID,PARTUUID
NAME SIZE RO TYPE MOUNTPOINT PARTLABEL UUID PARTUUID
sdb 465.8G 0 disk
├─sdb4 433.8G 0 part / rootfs 7ee60652-08bf-4713-be21-e1da784ae165 3f1c359a-94b5-4cd8-9fa6-4994740586ee
├─sdb2 256M 0 part /boot boot 8712ef66-e2b9-46ca-aa4c-f7e0e31ab981 2261b5e6-9d10-4f04-9e41-ebb23130413a
├─sdb3 31.8G 0 part [SWAP] swap ce41e34e-986a-40ca-8cb2-efcbb17fa7f8 19765bb2-b6c6-4ebe-8022-00cbe2e3bef3
└─sdb1 4M 0 part efi 4a088fd5-9ede-466a-8a62-4f0d5e34b0d8
sr0 1024M 0 rom
sdc 5.5T 0 disk
├─sdc2 4.5T 0 part /mnt/e_drive Basic data partition 561C1EA31C1E7DE5 8e2074e1-d0cc-48f5-af53-aedf25d28a17
└─sdc1 1T 0 part /data Basic data partition f19f512a-c9c7-478a-9da3-8a3b67bec275 1a1b88b2-1499-44fd-884d-6db8ff8b0041
sda 465.8G 0 disk
├─sda2 465.3G 0 part /mnt/c_drive D8D453DAD453BA08 5ae35627-02
└─sda1 500M 0 part 1806505F06504044 5ae35627-01
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/etc/fstab is as follows
| Code: |
UUID=7ee60652-08bf-4713-be21-e1da784ae165 / btrfs rw,noatime 1 0
UUID=7ee60652-08bf-4713-be21-e1da784ae165 /home btrfs defaults,autodefrag,noatime,subvol=home 1 0
UUID=7ee60652-08bf-4713-be21-e1da784ae165 /var btrfs defaults,autodefrag,noatime,subvol=var 1 0
UUID=8712ef66-e2b9-46ca-aa4c-f7e0e31ab981 /boot ext2 noauto,noatime,defaults 1 0
UUID=ce41e34e-986a-40ca-8cb2-efcbb17fa7f8 none swap sw 0 0
/dev/cdrom /mnt/cdrom auto auto,users,ro 0 0
tmpfs /tmp tmpfs rw,nosuid,noatime,nodev,size=12G,mode=1777 0 0
PARTUUID=5ae35627-02 /mnt/c_drive ntfs-3g defaults,gid=ntfs,umask=0,umask=002,nls=utf8,silent,exec,ro 0 0
PARTUUID=8e2074e1-d0cc-48f5-af53-aedf25d28a17 /mnt/e_drive ntfs-3g defaults,gid=ntfs,umask=0,umask=002,nls=utf8,silent,exec 0 0
PARTUUID=1a1b88b2-1499-44fd-884d-6db8ff8b0041 /data xfs defaults,noatime 0 0
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grub.cfg entry as generated by 'grub-mkconfig -o /boot/grub/grub.cfg' (does not boot)
| Code: | menuentry 'Gentoo GNU/Linux, with Linux 4.9.16-gentoo' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.9.16-gentoo-advanced-7ee60652-08bf-4713-be21-e1da784ae165' {
load_video
if [ "x$grub_platform" = xefi ]; then
set gfxpayload=keep
fi
insmod gzio
insmod part_gpt
insmod ext2
set root='hd1,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt2 --hint-efi=hd1,gpt2 --hint-baremetal=ahci1,gpt2 8712ef66-e2b9-46ca-aa4c-f7e0e31ab981
else
search --no-floppy --fs-uuid --set=root 8712ef66-e2b9-46ca-aa4c-f7e0e31ab981
fi
echo 'Loading Linux 4.9.16-gentoo ...'
linux /vmlinuz-4.9.16-gentoo root=UUID=7ee60652-08bf-4713-be21-e1da784ae165 ro video=uvesafb:1024x768-32,mtrr:3,ywrap
} |
grub.cfg entry as follows, with the root=/dev/sdb4 substituted (boots)
| Code: | menuentry 'Gentoo GNU/Linux, with Linux 4.9.16-gentoo' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.9.16-gentoo-advanced-7ee60652-08bf-4713-be21-e1da784ae165' {
load_video
if [ "x$grub_platform" = xefi ]; then
set gfxpayload=keep
fi
insmod gzio
insmod part_gpt
insmod ext2
set root='hd1,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt2 --hint-efi=hd1,gpt2 --hint-baremetal=ahci1,gpt2 8712ef66-e2b9-46ca-aa4c-f7e0e31ab981
else
search --no-floppy --fs-uuid --set=root 8712ef66-e2b9-46ca-aa4c-f7e0e31ab981
fi
echo 'Loading Linux 4.9.16-gentoo ...'
linux /vmlinuz-4.9.16-gentoo root=/dev/sdb4 ro video=uvesafb:1024x768-32,mtrr:3,ywrap
}
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...Lyall
Last edited by lyallp on Fri Apr 07, 2017 9:17 am; edited 1 time in total |
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massimo
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Joined: 22 Jun 2003
Posts: 1226
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| Posted: Fri Apr 07, 2017 7:33 am Post subject: |
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I suppose for this to work you have to use an initramfs.
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54220
Location: 56N 3W
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| Posted: Fri Apr 07, 2017 8:18 am Post subject: |
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lyallp,
The UUID is a property of a filesystem. To use it to mount root, the userspace mount program is required in an initrd.
Likewise, LABEL is a filesystem property too.
The kernel understands PARTUUID and block device names with no userspace help.
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Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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lyallp
Veteran
Joined: 15 Jul 2004
Posts: 1557
Location: Adelaide/Australia
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| Posted: Fri Apr 07, 2017 8:51 am Post subject: |
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Cool, verified that PARTUUID does indeed work, but how do I convince grub-mkconfig to auto-generate PARTUUID rather than UUID?
I can manually edit the grub.cfg after generating but it would be nice to be automatically done.
I am not particularly interested in setting up a ramdisk as my previous install was a lot more complicated (software raid, LVM) and this system is much simpler with no raid, no logical volumes, etc.
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