Arch Linux

percy_vere_uk

Member

Registered: 2016-01-08

Posts: 25

[solved] Cannot backup re-install

Hi

I have backed up severval arch systems using the following format:

tar -cvzp --atime-preserve --exclude=home/myself/Downloads/* --exclude=var/cache/* --exclude=mnt/* --exclude=var/log/* --exclude=proc/* -f arch2_26-11-16.tar.gz *

I use the format 

tar -xvzps --atime-preserve -f arch2_26-11-16.tar.gz -C /media/partition_to_install_to

To restore.

Changing /etc/fstab accordingly then 'grub-mkconfig -o /boot/grub/grub.cfg'

This method has always worked fine with gentoo.

When I try to install to a new partition with arch I always get the following boot error with all the arch backups:

Kernel panic - not synching: vfs: unable to mount root fs on unknown - block (0,0)[

Is there somthing additionally that I need to do when backing up or restoring with arch.

I know there are other backup methods but I would really like to continue using tar as it has always worked well with gentoo.

percy

Last edited by percy_vere_uk (2016-11-29 14:06:34)

Slithery

Administrator

From: Norfolk, UK

Registered: 2013-12-01

Posts: 5,776

Re: [solved] Cannot backup re-install

Are you editing your fstab and bootloader config to correctly point to the new root partition?

---

No, it didn't "fix" anything. It just shifted the brokeness one space to the right. - jasonwryan
Closing -- for deletion; Banning -- for muppetry. - jasonwryan

aur - dotfiles

percy_vere_uk

Member

Registered: 2016-01-08

Posts: 25

Re: [solved] Cannot backup re-install

slithery

The only file I have edited is /etc/fstab changed from:     

/dev/sdb2   /    ext4    rw,relatime,data=ordered    0 1     TO     /dev/sdb7    /     ext4     rw,relatime,data=ordered     0 1

Also tried a restore on /dev/sda 

 /dev/sda10    /    ext4   rw,relatime,data=ordered     0 1

Giving the same boot error.

Then    grub-mkconfig -o /boot/grub/grub.cfg

percy_vere_uk

Member

Registered: 2016-01-08

Posts: 25

Re: [solved] Cannot backup re-install

slithery

Problem solved, all I needed to do was  'chroot . /bin/bash'  prior to backup.

Never did this with gentoo, and never had a probem restoring.

Thanks for your input on this.

percy

percy_vere_uk

Member

Registered: 2016-01-08

Posts: 25

Re: [solved] Cannot backup re-install

As an addition to the above I found that I needed to:

chroot into the target system then       'mkinitcpio -p linux'         {To regenerate the kernel image}

In gentoo I do not have an initramfs  and  this is what foxed me!