User data script to automatically mount the additional vomue as home folder on AWS EC2

user-data-mount-separate-home-folder.b64

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user-data-mount-separate-home-folder.sh

#!/bin/bash

# Log all output for debugging
exec > >(tee /var/log/user-data.log) 2>&1

echo "Starting user data script at $(date)"

# Wait for the EBS volume to be available
echo "Waiting for EBS volume to be available..."
while [ ! -e /dev/nvme1n1 ]; do
  echo "Waiting for /dev/nvme1n1..."
  sleep 5
done

echo "EBS volume /dev/nvme1n1 is available"

# Create partition on the EBS volume
echo "Creating partition on /dev/nvme1n1..."
(
echo n # Add a new partition
echo p # Primary partition
echo 1 # Partition number
echo   # First sector (Accept default: 1)
echo   # Last sector (Accept default: varies)
echo w # Write changes
) | fdisk /dev/nvme1n1

# Wait a moment for the partition to be recognized
sleep 5

# Format the partition with XFS
echo "Formatting /dev/nvme1n1p1 with XFS..."
mkfs.xfs /dev/nvme1n1p1

# Get the UUID of the new partition
echo "Getting UUID of the partition..."
UUID=$(blkid -s UUID -o value /dev/nvme1n1p1)
echo "UUID: $UUID"

# Add entry to /etc/fstab
echo "Adding entry to /etc/fstab..."
echo "UUID=$UUID /home xfs defaults 0 0" >> /etc/fstab

# Create a temporary mount point to preserve existing home data
echo "Creating temporary mount point..."
mkdir -p /mnt/temp_home

# Mount the new volume temporarily
mount /dev/nvme1n1p1 /mnt/temp_home

# Copy existing /home contents to the new volume (if any)
if [ "$(ls -A /home 2>/dev/null)" ]; then
  echo "Copying existing /home contents to new volume..."
  cp -arv /home/* /mnt/temp_home/
fi

# Unmount the temporary mount
umount /mnt/temp_home
rmdir /mnt/temp_home

# Mount the new volume to /home
echo "Mounting new volume to /home..."
mount -av

# Reload systemd daemon
systemctl daemon-reload

# Verify the mount
echo "Verifying mount..."
df -h /home
mount | grep /home

echo "User data script completed successfully at $(date)"

# Optional: Create a marker file to indicate completion
touch /var/log/user-data-complete