Once a Pi is setup, it’s useful to clone the SD card and save the state. Here’s how.
# install shrink it
wget https://raw.githubusercontent.com/Drewsif/PiShrink/master/pishrink.sh
chmod +x pishrink.sh
sudo mv pishrink.sh /usr/local/bin
# insert sd, copy whole (incl. partitions) to a file.
# Will be the SIZE OF THE WHOLE SD CARD: we'll fix this later
sudo dd bs=4M if=/dev/mmcblk0 of=rpi.img conv=fsync
# shrink it
pishrink -p rpi.img
# write it: insert a fresh card
umount /dev/mmcblk0p1 /dev/mmcblk0p2 # if automounted
dd bs=4M if=rpi.img of=/dev/mmcblk0 status=process conv=fsync
# some useful commands
sudo fdisk -l /dev/mmcblk0 # 'physical' disk details
file original.img # img file partitions
losetup # mount a .img file (see note below)
fsck # check the filesystem/sSee more details on losetup too.
But wait! Is it exactly the same on a different machine? No! Change the cloned Pi a bit:
- Hostname (raspi-config and reboot)
- AP and MAC address-related (e.g. ap0 interface),
# get mac addr of wlan0 interface and change from masterpi's mac
iw dev
sudo vi /etc/udev/rules.d/70-persistent-net.rules
# change AP name
sudo vim /etc/hostapd/hostapd.conf