hello everyone, my Proxmox 3.4 has problem in grub and need to redo it, I tried to boot with ubuntu and I did not have success if algume can show me some procedure appreciate.
Marcio Souza
Marcio Souza
grub with problem
- Thread starter Marcio Souza
- Start date
Which one?
I tried to boot with ubuntu and I did not have success.
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hello
run the following commands with the system cd rescue, returned me the following message:
cannot open /boot/grub/i386-pc/search_fs_file.mod : No space left on device.
sudo mkdir /media/USB
sudo mount /dev/pve/root /media/USB/
sudo mount /dev/sda1 /media/USB/boot
sudo mount -t proc proc /media/USB/proc
sudo mount -t sysfs sys /media/USB/sys
sudo mount -o bind /dev /media/USB/dev
sudo mount -t devpts pts /media/USB/pts/
chroot /media/USB /bin/bash
grub-install /dev/sda
run the following commands with the system cd rescue, returned me the following message:
cannot open /boot/grub/i386-pc/search_fs_file.mod : No space left on device.
sudo mkdir /media/USB
sudo mount /dev/pve/root /media/USB/
sudo mount /dev/sda1 /media/USB/boot
sudo mount -t proc proc /media/USB/proc
sudo mount -t sysfs sys /media/USB/sys
sudo mount -o bind /dev /media/USB/dev
sudo mount -t devpts pts /media/USB/pts/
chroot /media/USB /bin/bash
grub-install /dev/sda
Hi,
You have to boot from the system rescue cd and select option 5 "Boot an existing linux system installed on the disk", if it boots OK it will ask for user and password, then I need to see the grub.cfg, if it doesn't boot this way I can't help you, its out of my knowledge.
You have to boot from the system rescue cd and select option 5 "Boot an existing linux system installed on the disk", if it boots OK it will ask for user and password, then I need to see the grub.cfg, if it doesn't boot this way I can't help you, its out of my knowledge.
This happens because Proxmox creates three partitions on a drive:
1. a 1MB BIOS boot partition
2. a 256MB EFI partition
3. the rest
The BIOS boot partition is too small for grub to be installed into, which is why it complains there is no space left
Grub needs at least 9.3MB to install
I don't have the error output with me, but when following the grub recovery page: https://pve.proxmox.com/wiki/Recover_From_Grub_Failure
I get an error that it is not able to mount /dev/<proxmox>1 because it "can't find the magic block" or "doesn't know what fs it is"
not sure why you think that would be the case, but it is wrong. 1MB is enough for grub, just needs the code for loading the rest from /boot (stage1 / 1.5)
If you test it and run "grub-install /dev/sda" you'll see that it'll result in taking up 9.3MB
Unless there are other grub-install options or pre-requisites that are required.
So far, the issues are:
- unable to mount /dev/sdX1, because it is unable to determine the fs/magicblock/etc.
- you can reformat /dev/sdX1 to ext2, and then run "grub-install /dev/sdX", but you'll get the "No space left on device" error message
grub has a lot of checks to detect the installation scenario - if you give it a partition, it will install more than just the stage1(.5) there.. if your disk is partitioned correctly (GPT, correct UUIDs), a 1 MB BIOS boot partition is enough.
The scenario is that Proxmox is not able to boot. Proxmox had been installed and working prior to it no longer working. And upon following https://pve.proxmox.com/wiki/Recover_From_Grub_Failure
You get the following issues:
- unable to mount /dev/sdX1, because it is unable to determine the fs/magicblock/etc.
- you can reformat /dev/sdX1 to ext2, and then run "grub-install /dev/sdX", but you'll get the "No space left on device" error message
This is when using what Proxmox had already setup
I see. Is there a documented method for reinstalling grub for Proxmox? What do we need to do with the BIOS boot and EFI System partitions?
Code:
root@world:~# fdisk -l /dev/sdo
Disk /dev/sdo: 37.3 GiB, 40020664320 bytes, 78165360 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 19BA5C67-40CA-4F7F-9E4C-37E00A0ED190
Device Start End Sectors Size Type
/dev/sdo1 2048 4095 2048 1M BIOS boot
/dev/sdo2 4096 528383 524288 256M EFI System
/dev/sdo3 528384 78165326 77636943 37G Linux LVMthe installer simply does:
for legacy/BIOS boot
and:
with the vfat formatted ESP mounted at /boot/efi for EFI boot
FOO is the whole disk in both cases, and grub will do the rest automatically.
Code:
grub-install --target i386-pc --no-floppy --bootloader-id='proxmox' /dev/FOOand:
Code:
grub-install --target x86_64-efi --no-floppy --bootloader-id='proxmox' /dev/FOOFOO is the whole disk in both cases, and grub will do the rest automatically.