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--- raspberry_pi_3_boot_to_usb [2016/12/14 16:32] – walkeradmin
+++ raspberry_pi_3_boot_to_usb [2023/03/09 22:35] (current) – external edit 127.0.0.1
@@ Line 50: / Line 50: @@
 \\
 <color red>NOTE - If you use the SAME boot SD Card each time to make a bootable disk, you only need to perform the steps above ONCE</color>
+\\
 \\
 ==== Prepare the USB storage device  ====
 \\
+Now that your Pi is USB boot-enabled, we can prepare a USB storage device to boot from.\\
+Start by inserting the USB storage device (which will be completely erased) into the Pi.\\
+Rather than downloading the Raspbian image again, we will copy it from the SD card on the Pi.\\
+The source device (sd card) will be <color red>/dev/mmcblk0</color> and the destination device (USB disk)\\
+should be <color red>/dev/sda</color> assuming you have no other USB devices connected.
+\\
+\\
+We will start by using Parted to create a 100MB FAT32 partition, followed by a Linux ext4 partition that will take up the rest of the disk.
+\\
+\\
+<file>
+sudo parted /dev/sda
+(parted) mktable msdos
+Warning: The existing disk label on /dev/sda will be destroyed
+and all data on this disk will be lost. Do you want to continue?
+Yes/No? Yes
+(parted) mkpart primary fat32 0% 100M
+(parted) mkpart primary ext4 100M 100%
+(parted) print
+Model: SanDisk Ultra (scsi)
+Disk /dev/sda: 30.8GB
+Sector size (logical/physical): 512B/512B
+Partition Table: msdos
+Disk Flags:
+Number  Start   End     Size    Type     File system  Flags
+      1049kB  99.6MB  98.6MB  primary  fat32        lba
+      99.6MB  30.8GB  30.7GB  primary  ext4         lba
+</file>
 \\
+Your <color red>parted</color> print output should look similar to the one above.
 \\
+\\
+Create the boot and root file systems:
+\\
+\\
+    sudo mkfs.vfat -n BOOT -F 32 /dev/sda1
+    sudo mkfs.ext4 /dev/sda2
+\\
+\\
+Mount the target file system and copy the running raspbian system to it:
+\\
+\\
+<file>
 sudo mkdir /mnt/target
 sudo mount /dev/sda2 /mnt/target/
@@ Line 87: / Line 105: @@
 sudo apt-get update; sudo apt-get install rsync
 sudo rsync -ax --progress / /boot /mnt/target
+</file>
+\\
+Regenerate ssh host keys:
+\\
+\\
+<file>
 cd /mnt/target
 sudo mount --bind /dev dev
@@ Line 99: / Line 122: @@
 sudo umount sys
 sudo umount proc
+</file>
+\\
+Edit <color red> /boot/cmdline.txt</color> so that it uses the USB storage device as the root file\\
+system instead of the SD card.
+\\
+\\
+    sudo sed -i "s,root=/dev/mmcblk0p2,root=/dev/sda2," /mnt/target/boot/cmdline.txt
+\\
+\\
+The same needs to be done for <color red>fstab:</color>
+\\
+\\
+    sudo sed -i "s,/dev/mmcblk0p,/dev/sda," /mnt/target/etc/fstab
+\\
+\\
+Finally, unmount the target file systems, and power the Pi off.
+\\ <file>
+cd ~
+sudo umount /mnt/target/boot
+sudo umount /mnt/target
+sudo poweroff
+</file>
+\\
+Disconnect the power supply from the Pi, remove the SD card, and reconnect the power supply. If all has gone well, the Pi should begin to boot after a few seconds.
+\\
+\\
+----
+==== NOTE ====
+\\
+\\
+Once you have done a couple, and you are comfortable with the sequence, you can copy and paste the commands in batches:
+\\
+\\
+<file>
+sudo mkdir /mnt/target
+sudo mount /dev/sda2 /mnt/target/
+sudo mkdir /mnt/target/boot
+sudo mount /dev/sda1 /mnt/target/boot/
+sudo apt-get update; sudo apt-get install rsync
+sudo rsync -ax --progress / /boot /mnt/target
+</file>
+\\
+<file>
+cd /mnt/target
+sudo mount --bind /dev dev
+sudo mount --bind /sys sys
+sudo mount --bind /proc proc
+sudo chroot /mnt/target
+rm /etc/ssh/ssh_host*
+dpkg-reconfigure openssh-server
+</file>
+\\
+exit
+\\
+<file>
+sudo umount dev
+sudo umount sys
+sudo umount proc
+</file>
+\\
+<file>
 sudo sed -i "s,root=/dev/mmcblk0p2,root=/dev/sda2," /mnt/target/boot/cmdline.txt
 sudo sed -i "s,/dev/mmcblk0p,/dev/sda," /mnt/target/etc/fstab
+</file>
+\\
+<file>
 cd ~
 sudo umount /mnt/target/boot
 sudo umount /mnt/target
-# sudo poweroff
+</file>
+\\
+\\
+sudo poweroff
 \\
 \\