Raspberry Pi 3 Model B+ – Reusable Raspbian Custom Image

Build a Custom Raspbian Image using only Raspbian Stretch running on a Raspberry Pi 3 Model B+. Create a non expanding image, customized with the applications & tools to meet your specification. Learn the basic commands for this six (6) part process to produce a Reusable Raspbian Image.

The Six (6) Part Process - Reusable Raspbian Custom Image

• Part OO — Introduction
• Part OA — Install Raspbian OS
• Part OB — Resize Partition & File System
• Part OC — Update Disk ID
• Part OD — Disable Auto Resize
• Part OE — Configure & Update
• Part OF — Create Backup Image

Disclaimer and word of caution, these methods & disk imaging processes will destroy all data stored on the SD card. Please ensure you have a full backup of any important data saved on the SD card before you start.

Usually it takes about 30-45 mins, on a fast connection, to complete all six (6) parts of the above process. Be patient, ensure you have stable power and do not unplug the power adapter.

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Part OA – Install Raspbian OS

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# Step A.01 - Install Applications - If Required
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sudo apt-get install gparted -y
sudo apt-get install eject -y


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# Step A.02 - Find Device - microSD - '/dev/sde'
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Menu --> Preferences --> GParted


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# Step A.03 - Verify MD5 - Raspbian Image
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sudo md5sum -c 2018-04-18-raspbian-stretch.img.md5


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# Step A.04 - Install OS - Raspbian Image
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sudo dd if=2018-04-18-raspbian-stretch.img of=/dev/sde bs=5M status=progress conv=sync

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Part OB – Resize Partition & File System

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# Step B.05 - ReSize 'root' Partition - Number 2
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sudo parted -m /dev/sde u s resizepart 2 6144MB


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# Step B.06 - Check 'root' FileSystem
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sudo e2fsck -f /dev/sde2


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# Step B.07 - ReSize 'root' FileSystem
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sudo resize2fs /dev/sde2


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# Step B.08 - Verify Changes Visually - /dev/sde
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Menu --> Preferences --> GParted

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Part OC – Update Disk ID

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# Step C.09 - Get Disk UUID - '/dev/sde' - 8 Hex Digits - 'xxxxxxxx'
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sudo blkid -o export /dev/sde | grep PTUUID


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# Step C.10 - Mount 'boot' & 'root' FileSystem
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sudo mkdir /media/pi/boot
sudo mkdir /media/pi/rootfs
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sudo mount /dev/sde1 /media/pi/boot
sudo mount /dev/sde2 /media/pi/rootfs


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# Step C.11 - Modify Auto Mount - '/etc/fstab'
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# a. Update 'PARTUUID=xxxxxxxx-01 /boot '
# b. Update 'PARTUUID=xxxxxxxx-02 /'
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sudo nano /media/pi/rootfs/etc/fstab


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# Step C.12 - Modify '/boot/cmdline.txt'
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# a. Update 'root=PARTUUID=xxxxxxxx-02'
# b. Delete 'init=/usr/lib/raspi-config/init_resize.sh'
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sudo nano /media/pi/boot/cmdline.txt

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Part OD – Disable Auto Resize

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# Step D.13 - Delete '/etc/init.d/resize2fs_once'
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sudo rm /media/pi/rootfs/etc/init.d/resize2fs_once


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# Step D.14 - Delete '/etc/rc3.d/S01resize2fs_once'
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sudo rm /media/pi/rootfs/etc/rc3.d/S01resize2fs_once


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# Step D.15 - Clean Up & UnMount 'boot' & 'root' FileSystem
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sudo umount /dev/sde1
sudo umount /dev/sde2
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sudo rmdir /media/pi/boot
sudo rmdir /media/pi/rootfs


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# Step D.16 - Eject Device - /dev/sde
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sudo eject /dev/sde

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Part OE – Configure & Update

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# Step E.17 - Install Applications
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sudo apt-get install xscreensaver -y
sudo apt-get install numlockx -y
sudo apt-get install eject -y
sudo apt-get install hdparm -y
sudo apt-get install sysbench -y
sudo apt-get install gparted -y


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# Step E.18 - Install Updates & Configure
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sudo apt-get update
sudo apt-get upgrade -y
sudo update-nodejs-and-nodered

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Part OF – Create Backup Image

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# Step F.19 - Create Backup - Raspbian Image
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sudo dd if=/dev/sde of=base.img bs=1M count=6400 status=progress conv=sync


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# Step F.20 - Create MD5 - Raspbian Image
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sudo md5sum base.img > base.img.md5

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