mondo-devel Mailing List for Mondo Rescue

On 28/1/2021 12:04 μ.μ., Nikolaos Milas wrote:

> However, now, with CentOS 8, I have still been unable to re-install 
> GRUB successfully.

A correction to the above: as you'll have seen -if you have read my 
whole post-, in the end I managed to install GRUB!

(The above text was a left-over from my initial text composition; In 
parallel I was continuing efforts, and when I succeeded I forgot to 
update the above test.)

Cheers,
Nick

On 28/1/2021 9:57 π.μ., Nikolaos Milas wrote:

> What is the device.map? How can this error be avoided or fixed?

Interestingly, (I now remembered that) I had faced the same issue(s) 
again when restoring a CentOS 7 box, on the same environment (VM on a 
private cloud [GRNET ViMa VPS Service] for production systems addressed 
to the Public Research & Educational Institutions in Greece).

See the thread at: https://sourceforge.net/p/mondo/mailman/message/35572230/

At the time (4 years ago) I had found a solution, by re-installing GRUB, 
yet, the issue probably was never fixed.

However, now, with CentOS 8, I have still been unable to re-install GRUB 
successfully.

In the meantime, I made a new restore effort.

During this new effort, mondorestore did NOT ask me to do "mkinitrd 
initramfs" (or I missed it and it continued on). This has happened to me 
more than once: sometimes I am taken to do "mkinitrd initramfs" and 
sometimes not (or I miss it and it continues on, without my noticing it).

Bruno, any comments on this?

In the end, I restarted with CentOS 8 boot disk, entered Troubleshooting 
mode (Rescue / Option 1: Continue) and tried to re-install GRUB:

    chroot /mnt/sysroot

I noticed that /dev/vda1 was not mounted, so I did:

    mnt /dev/vda1 /boot

I saw that in /boot/grub2 there is a grub.cfg.pristine file (with 
current timestamp, which means it was probably created during restore). 
There is also the original (judging from timestamp) grub.cfg, which I 
renamed to grub.cfg.old and then I did:

    grub2-mkconfig -o /boot/grub2/grub.cfg

Then, to get the current UUIDs I did:

    blkid

and corrected /etc/fstab accordingly (using the current UUID for 
/dev/vda1), because the boot partition (/dev/vda1) is specified by UUID 
therein.

Finally I exited and rebooted, but still it won't boot.

I again entered Troubleshooting mode; this time, when I did:

    chroot /mnt/sysroot

I noticed that /dev/vda1 was normally mounted at /boot so I tried:

    grub2-install /dev/vda

which was executed successfully:

    Installing for i386-pc platform.
    Installation finished. No error reported.

Finally I retried rebooting and this time it booted successfully! In the 
login prompt there was a message:

    mailgwl login: [   22.150700] nf_conntrack: default automatic helper
    assignment has been turned off for security reasons and CT-based
    firewall rule not found. Use the iptables CT target to attach
    helpers instead.

I will need to investigate this, but the VM has been finally restored 
and working!

 From the above can you trace any possible issue with mondo that might 
need to get fixed to improve the restore procedure?

In any case, it is obvious that I wouldn't avoid the need to update 
/etc/fstab with the correct UUID (if it has changed). Could this be the 
cause that mondorestore fails to install GRUB successfully, i.e. due to 
the fact that the boot partition cannot be mounted correctly because of 
the UUID change?

Looking forward to your feedback.

All the best,
Nick

On 28/1/2021 3:15 π.μ., Bruno Cornec wrote:

> Your device.map file looks worng to me.
> If grub2 can't be reinstalled you won't boot.

Thanks Bruno,

What is the device.map? How can this error be avoided or fixed?

Is it pertinent to mondoarchive or to the backed-up box (VM) 
properties/configuration?

What are your suggestions?

Thanks again for all your efforts!

Cheers,
Nick

I think you have an issue during the restoration of grub:

Content of /mnt/RESTORING/boot/grub2/device.map
-------------------
# this device map was generated by anaconda
(hd0)      /dev/vda
(hd1)      /dev/vda
Now I'll use grub2-install
Launching: chroot /mnt/RESTORING grub2-install --force /dev/vda
Installing for i386-pc platform.
grub2-install: error: cannot find a GRUB drive for /dev/vda1.  Check your device.map.
grub2-install returned 1


Your device.map file looks worng to me.
If grub2 can't be reinstalled you won't boot.

Bruno.

Nikolaos Milas said on Wed, Jan 27, 2021 at 02:33:24PM +0200:

>On 27/1/2021 1:24 μ.μ., Nikolaos Milas wrote:
>
>>(I tried hard to download the mondorestore.log, for your reference, 
>>but I still haven't managed to do it successfully.)
>
>I finally managed to get the mondorestore.log file.
>
>You can see it here: http://iweb.noa.gr/files/mgw1mondorestore.log
>
>Thanks in advance for your advice!
>
>All the best,
>Nick
>
>
>
>
>
>
>
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-- 
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Open Source Profession, WW Linux Community Lead    http://github.com/bcornec
FLOSS projects:     http://mondorescue.org        http://project-builder.org
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On 27/1/2021 1:24 μ.μ., Nikolaos Milas wrote:

> (I tried hard to download the mondorestore.log, for your reference, 
> but I still haven't managed to do it successfully.)

I finally managed to get the mondorestore.log file.

You can see it here: http://iweb.noa.gr/files/mgw1mondorestore.log

Thanks in advance for your advice!

All the best,
Nick

Hello,

I am having a hard time trying to restore a Centos 8 VM.

I have taken a backup using mondoarchive (mondo-3.3.0-1.centos8.x86_64) 
within a CentOS 8 box, then I tried to mondorestore on another VM 
(smaller), automatically (using bootable backup ISO).

Boot partition /dev/vda1 is ext4, root partition /dev/vda2 is LVM and 
there is a swap partition too.

During mondorestore, it took me to do

    |mkinitrd initramfs...|

which seemed to complete successfully.

The whole process seemed to end successfully, but the new system is not 
bootable.

I tried: 
https://translate.google.com/translate?hl=&sl=auto&tl=en&u=https%3A%2F%2Fblog.techlab-xe.net%2Frestore-centos8-mondorescue%2F&sandbox=1

I entered CentOS 8 rescue mode (to prompt) and run:

blkid    ---->    I found new UUIDs

I then did:

     e2fsck -f /dev/vda1
     tune2fs -U <new_UUID> /dev/vda1

which appeared to finish successfully.

The system still remains non-bootable.

(I tried hard to download the mondorestore.log, for your reference, but 
I still haven't managed to do it successfully.)

Any hint please on restoring CentOS 8? Why it refuses to boot?

Any suggestions?

Thanks,
Nick

Hello,

Kwangdo Yi said on Thu, Jan 14, 2021 at 10:59:07AM -0500:
>I have an iso image, it seems like it is archived with a CD Rom drive but
>my server PC doesn't have a CD Rom drive. So I made a bootable USB with the
>iso file. 
> It goes to the boot screen but when I hit <enter>, it just keeps
>booting up with the vmlinux image in the USB. I need to restore the cloned
>image to my HDD. Is it not possible to use USB for mondorestore of a CD
>image?

Try the recipe here: http://trac.mondorescue.org/wiki/FAQ#Q42HowtotransformamondoCDDVDintoamondoUSBdevice
Worst case restore manually your content: http://trac.mondorescue.org/wiki/Documentation#Manualrestoration

Bruno.
-- 
HPE WW FLOSS Technology Strategist      http://www.hpe.com/engage/opensource
Open Source Profession, WW Linux Community Lead    http://github.com/bcornec
FLOSS projects:     http://mondorescue.org        http://project-builder.org
Musique ancienne?   http://www.musique-ancienne.org  http://www.medieval.org

Hi all,

I am new to the Mondorescue and struggling to restore my server PC with
Mondorescue.
I have an iso image, it seems like it is archived with a CD Rom drive but
my server PC doesn't have a CD Rom drive. So I made a bootable USB with the
iso file. It goes to the boot screen but when I hit <enter>, it just keeps
booting up with the vmlinux image in the USB. I need to restore the cloned
image to my HDD. Is it not possible to use USB for mondorestore of a CD
image?
Thanks.

Best Regards,

Kwangdo Yi
Embedded Software Engineer II
*FUJIFILM *Dimatix Inc.
7 Commerce Ave
West Lebanon, New Hampshire 03784
desk : 603 443 5359
cell: 858 335 5501
E-mail: kwa...@fu...
Web: http://www.dimatix.com

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Thanks Martin for the feedback. I updated the page accordingly and also added a receipt for the manual restoration of big files. Feel free to comment back.

Bruno.

Martin Ringwelski said on Thu, Oct 22, 2020 at 10:02:15AM +0200:

>Hi,
>
>this Thread is old, but I want to add something
>
>Am 05.04.20 um 01:21 schrieb Bruno Cornec:
>>
>> Could you try to use the recit detailed here:
>> http://trac.mondorescue.org/wiki/Documentation#Manualrestoration
>> If that doesn't help, let me know.
>>
>The afio command is not complete, it should be:
>
>afio -ivZ -P lzop /cdrom/archives/13.afio.lzo
>
>But I also have a question: How do I recreate big files that are
>backuped using slices?
>
>Thanks in advance
>
>Martin
>





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-- 
HPE WW FLOSS Technology Strategist      http://www.hpe.com/engage/opensource
Open Source Profession, WW Linux Community Lead    http://github.com/bcornec
FLOSS projects:     http://mondorescue.org        http://project-builder.org
Musique ancienne?   http://www.musique-ancienne.org  http://www.medieval.org