Failing to boot after moving /boot folder to /
 

Hi there,
Recently I moved my /boot folder to / (this is my home directory with 16 TB space) for more space. After update now I can't boot up. It always says If I boot up in rescue mode, it says:My OS is Centos 7. I am new in system administration. I appreciate your help.

Best Regards
Zillur

Did you reinstall your boot loader?

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Steve Stites

Thank you. No. Do I need to do this? How can I reinstall boot loader?

Best Regards
Zillur

Is this the same system as in your other thread? If so you had three partitions /, /boot and /home. Did you really run the command as posted? If so it should not of done anything.

You can boot the install disc and reinstall grub

Thank you very much. I think, I ran the command. How can do this? I mean "boot the install disc and reinstall grub".

Best Regards
Zillur

Can you confirm that this thread is about your CentOS 7 system from this thread?
http://www.linuxquestions.org/questi...ot-4175563687/

One method to move /boot from /dev/sdb1 to / (/dev/sdb2):
unmount /boot
mount /dev/sdb1 to something else like /mnt/oldboot
cp -rp /mnt/oldboot/* /boot (make sure files are copied successfully)

Comment out or delete the /boot line in your /etc/fstab file.

Boot from the CentOS 7 DVD and select rescue mode.
Once at a shell prompt follow the instructions for chroot
chroot /mnt/sysimage

Since you have two drives do you know which is the boot drive? Usually it would be sda but your /home is on sda and the OS on sdb. I can't tell if your using a legacy MBR or UEFI. Legacy BIOS and MBR would be:

grub2-install /dev/sda

As a note for others who might be interested since the OP is actually using LVM do not move /boot from its own partition.

Thank you very much. Yes. It is the same system. Is there any way to boot without Centos 7 DVD? I can do this: only after successful boot up.

Best Regards
Zillur

You need some alternative boot device.

Thank you very much. What do you mean my alternative boot device? Sorry for asking details.

Best Regards
Zillur

A DVD or usb drive.

First you better check and see if CentOS 7 will boot using an xfs filesystem, as that is what the root filesystem is by default.

This is one of the reasons /boot has been a separate partition for ages - there are a few filesystems that will not support being used for boot. Fedora still uses ext4 for /boot, but does (like CentOS 7) use xfs for root.

Thank you very much.
Currently I don't have a Centos 7 DVD or USB. But, I have some writable DVD (16x|4.7GB|120min). Can I use these DVDs (Download the necessary files and write them to this DVD). If so, Can you give me the link where I can download the files? I appreciate your help very much.

Best Regards
Zillur

The DVD ISO.

https://www.centos.org/download/

Thank you very much. I have downloaded and burned the iso image on the disk from my mac. Now what I need to do? Only insert the disk into the DVD rom of the linux machine?

Best Regards
Zillur

Boot the DVD and when a menu displays select troubleshooting, then rescue mode and then continue. You will now be at a command line prompt. Type the commands

chroot /mnt/sysimage

cd /boot

Are there any files in the directory?