Writing a Bare-Metal Ubuntu Recovery Script in Bash

When Your Server Hits the Floor

You know the feeling. Your heart sinks. A client calls, or your monitoring dashboard flashes red. Total catastrophic failure. Relying on manual setups is a joke when the clock is ticking and people are yelling. You need a solid ubuntu disaster recovery plan. Not tomorrow. Right now. Writing a script to automate this mess saves you from those 3 AM cold sweats. Let's build one.

Starting from Absolute Scratch

A true bare metal restore bash script assumes you have nothing. Just a fresh, blank slab of hardware. Or a newly provisioned empty VM. First, you boot from a live USB or ISO. Your script needs to grab the wheel immediately. It has to look at those empty drives and know exactly what to do. No hesitation.

Automating the Partition Hustle

Nobody wants to manually run fdisk while panicking. Your bash script needs to handle the disk geometry automatically. Feed a layout directly into sfdisk to lay down the boot, root, and swap partitions. Make it silent. Make it ruthless. Something like dumping your saved layout into the drive. Boom. Formatted. Moving on.

The Great Data Migration

Here is where your system rebuild script does the heavy lifting. The drives are ready. Now you mount them and pull your archive. Tar and Rsync are your best friends here. Extract the root filesystem right onto the newly mounted drive. Keep an eye on permissions. If you mess up the flags, your restored system will be a chaotic, unbootable nightmare. Use strict archive flags and do not skip the extended attributes.

Waking the Dead

The files are there. The system is physically rebuilt. But it is asleep. It has no idea how to boot. You have to bind-mount the system directories into your new environment. Then, chroot in. Reinstall GRUB to the boot partition. Update the initramfs. Double-check your fstab UUIDs because they absolutely changed when you formatted those drives. Reboot. Watch it come alive.