How to save data and run the server again / Ubuntu16.04?

baris35 · April 29, 2019, 2:46pm

Hello,
I am running ubuntu 16.04 and I have rented a server three days ago.
I am with OVH and during image installation I did not merge hdd partitions, just proceed with custom installation configuration.
Today I rebooted and server went offline.
Company says: "Connect in rescue mode and check the possible reasons."
But I do not know how to proceed.
I'd appreciate your help.

Extra Info:

root@rescue:~# cat /proc/mdstat

Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty]
md2 : active raid1 sda2[0] sdb2[1]
      1047488 blocks [2/2] [UU]

md3 : active raid1 sda3[0] sdb3[1]
      82226112 blocks [2/2] [UU]

md4 : active raid1 sda4[0] sdb4[1]
      3822690240 blocks [2/2] [UU]
      bitmap: 0/29 pages [0KB], 65536KB chunk

unused devices: <none>

root@rescue:~# fdisk -l

Disk /dev/ram0: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram1: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram2: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram3: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram4: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram5: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram6: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram7: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram8: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram9: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram10: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram11: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram12: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram13: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram14: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram15: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/sda: 3.7 TiB, 4000787030016 bytes, 7814037168 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: E0C93F06-7ADC-4E84-A797-D1CB307F0F28

Device          Start        End    Sectors  Size Type
/dev/sda1        2048    1048575    1046528  511M EFI System
/dev/sda2     1048576    3143679    2095104 1023M Linux RAID
/dev/sda3     3143680  167596031  164452352 78.4G Linux RAID
/dev/sda4   167596032 7812976639 7645380608  3.6T Linux RAID
/dev/sda5  7812976640 7814023167    1046528  511M Linux swap

Disk /dev/sdb: 3.7 TiB, 4000787030016 bytes, 7814037168 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: 0A3AD712-C9F7-4521-B0D6-233FF9A28323

Device          Start        End    Sectors  Size Type
/dev/sdb1        2048    1048575    1046528  511M EFI System
/dev/sdb2     1048576    3143679    2095104 1023M Linux RAID
/dev/sdb3     3143680  167596031  164452352 78.4G Linux RAID
/dev/sdb4   167596032 7812976639 7645380608  3.6T Linux RAID
/dev/sdb5  7812976640 7814023167    1046528  511M Linux swap

Disk /dev/md4: 3.6 TiB, 3914434805760 bytes, 7645380480 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
Disk /dev/md3: 78.4 GiB, 84199538688 bytes, 164452224 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
Disk /dev/md2: 1023 MiB, 1072627712 bytes, 2094976 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

root@rescue:~# mount /dev/md2 /mnt
root@rescue:~# cd /mnt/
root@rescue:/mnt# chroot /mnt
chroot: failed to run command �/bin/bash': No such file or directory

Thank you
Boris

Corona688 · April 29, 2019, 3:20pm

It needs /mnt/bin/bash to be present, or some other shell you specify like chroot /mnt /bin/sh

If /dev/md2 is not a "root directory", chroot will not work. Or you may need to mount further partitions inside /mnt. What does ls /mnt show? What ought to be in the other partitions?

baris35 · April 29, 2019, 3:24pm

Thank you,
Is this a simple process to save data or more complicated?

root@rescue:/mnt# ls
config-4.9.168-xxxx-std-ipv6-64  initrd.img-4.9.168-xxxx-std-ipv6-64
efi                              System.map-4.9.168-xxxx-std-ipv6-64
grub                             vmlinuz-4.9.168-xxxx-std-ipv6-64
root@rescue:/# chroot /mnt /bin/sh
chroot: failed to run command �/bin/sh': No such file or directory

MadeInGermany · April 29, 2019, 4:58pm

I think that chroot wants /bin/bash or /bin/sh relative to /mnt i.e. /mnt/bin/bash or /mnt/bin/sh.
It only makes sense if it hold the OS.
But your /dev/md2 is not the OS disk (it looks like a /boot disk). Try to mount /dev/md3 instead (umount first).

baris35 · April 29, 2019, 7:31pm

Thank you MadeInGermany,
Did not work. Then I call many ovh partner from Usa to Canada, Colombia to Brazil, Spain to France and Scandinavian counties, non of them responded.
Then, I reinstalled everything from scratch. I also received installation errors during new image installation and the company does not accept any failure message pop out on my screen. They say "that is not within the framework of our responsibility"
Lesson learnt: Backup all the time, do not trust any company.
I also had did it earlier but installation of codes will take too much time.
I will mark as "solved"

Thank you
Boris