HarvsG/ThickPi.md

## ThickPi.md

      
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              ThickPi.md
            
          
    Ideas for network booting raspberry Pis


Configure an iSCSI target on a Pi

install ubuntu server https://ubuntu.com/download/iot/raspberry-pi-2-3 using belena etcher
log in via ssh user:ubuntu pw:ubuntu - enabled by default on ubuntu server. change password
sudo apt update && sudo apt upgrade -y
sudo su
sudo apt -y install targetcli-fb
plug in s usb drive and as su fdisk -l
fdisk /dev/sda then commands d to delete current parition n to start new, then keep defaults. Then exit with w
reboot or run partprobe
targetcli
cd /backstores/block
create disk /dev/sda1
/iscsi
create iqn.2019-09.local.ubuntu:server
/iscsi/iqn.2019-09.local.ubuntu:server/tpg1/acls
create iqn.2019-09.local.ubuntu:pi3b1 change pi3b1 to the name of your client
cd iqn.2019-09.local.ubuntu:pi3b1
set auth userid=pi3b1 set auth password=raspberry
/iscsi/iqn.2019-09.local.ubuntu:server/tpg1/luns
create /backstores/block/disk
exit
ss -napt | grep 3260 `LISTEN   0         256                 0.0.0.0:3260            0.0.0.0:*


Install BerryBoot on an SD card for each pi.

format an SD as Fat32, partition table should be MBR/MSDOS
Copy the conents of the berryboot zip to the root folder
add vncinstall ipv4=192.168.88.88/255.255.255.0/192.168.88.1 datadev=isci qmap=gb to the end of the cmdline.txt - changing IPs as appropriate, do not put it on a newline.
edit iscsi.sh as apporopriate and add /sbin/iscsistart -i "iqn.2019-09.local.ubuntu:pi3b1" -g 1 -t "iqn.2019-09.local.ubuntu:server" -a "192.168.0.7" -u "pi3b1" -w "password" to iscsi.sh using the iqns and settings used in 1
now if all is working you may find you boot into an empty boot menu with all options greyed out. If this is the case continue
edit cmdline.txt once more this time delete datadev=iscsi for now. reboot berryboot
this time you should boot into the berryboot set up - click through the menus, set up the iscsi manually.
It should add a new disk sda1, select this a format the disk
then it take you to a bootmenu editor with the correct amount of free space availible. Install any OS from the menu.
It will reboot and will fail, edit cmdline.txt once more and replace datadev=<some long hexadecimal> with datadev=iscsi and reboot.
You should now be in the bootmenu with the single OS you installed and a valid button through to the bootmenu editor.


Add new OS

copy a chosen OS from https://berryboot.alexgoldcheidt.com/images/, extract to a fat32 formatted USB. Connect the USB to the client pi and then long press Add OS and then add from USB stick.


Switch between OSs/projects easily with this methodology -(currently untested)


Edit OS root files by doing the following

Get the partition layout of the image


$ sudo fdisk -lu /var/lib/iscsi_disks/disk01.img
...
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
Device                           Boot  Start      End  Sectors  Size Id Type
/var/lib/iscsi_disks/disk01.img1        2048   262143   260096  127M  e W95 
/var/lib/iscsi_disks/disk01.img2      262144 20971519 20709376  9.9G 83 Linu


Calculate the offset from the start of the image to the start of the large partition


Sector size * Start = (in the case) 512 * 262144 = 134217728


Make a mount point


sudo mkdir /mnt/iscsiDisk01/
sudo mkdir /mnt/OS1/


Mount it on /dev/loop98 using the offset

sudo losetup -o 134217728 /dev/loop98 /var/lib/iscsi_disks/disk01.img


Now the partition resides on /dev/loop0. You can fsck it, mount it etc

sudo fsck -fv /dev/loop98
sudo mount -rw /dev/loop98 /mnt/iscsiDisk01


Now you can browse

cd /mnt/iscsiDisk01/images


NB. So far just dropping images into /mnt/iscsiDisk01/images/ doesn't seem to work - although I haven't yet tried images from https://berryboot.alexgoldcheidt.com/images/


Now mount an image


sudo mount -rw Debian_Stretch_Raspbian_2018.11.img192 /mnt/OS1
cd /mnt/OS1/


Make any changes


Unmount


cd /
sudo umount /mnt/OS1
sudo umount /mnt/iscsiDisk01
sudo losetup -d /dev/loop98

                                                                  +---+  +---+
                                                                  |SSD|  |SSD|
                                                                  |   |  |   |
 +------+            +-----------------------+                    |   |  |   |
 |ISP   |            |                       |                    +---+  +---+
 |Router|            |     8 port switch     |                        |  |
 |In    |  +------+  |                       |                        |  |
 |Modem |  |GlInet|  |                       |  +----+ +----+ +----+ ++--++
 |Mode  |  |Router|  |                       |  |pi 1| |pi 2| |pi 3| |pi 4|
 |      |  |?POE  |  |4 non poe 4 poe ports  |  |3B  | |3B  | |3B+ | |4B  |
 |      |  |VPN   |  |                       |  |Hole| |OSMC| |DATA| |NAS |
 +--+--++  +-+--+-+  +--+-+-+-+---+-+-+-+----+  +--+-+ +--+-+ +--+-+ +--+-+
    |  |     |  |       | | | |   | | | |          |      |      |      |
    |  +-----+  +-------+ | | |   | | | +----------+      |      |      |
    |                     | | |   | | +-------------------+      |      |
    |                     v | v   | +----------------------------+      |
    v                    AP | TV  +-------------------------------------+
   WAN                      |
                            v
                        x86 Laptop Server

Made on ASCIFLOW
Issues

 Headless set up is tricky. The vncinstall ipv4=192.168.88.88/255.255.255.0/192.168.88.1 above enables VNC for berryboot. However this does not garuntee that any OS booted will be headless. Even though berryboot's /boot/ folder becomes the /boot/ of the OS adding a ssh file does not seem to carry through
 There doesn't seem to be a way to add one's own OS to the system yet. I have tried the long press add OS button -> add from usb but it didn't recognise the USB (I havent checked the format yet).