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RPi¶

Raspberry Pi 4 boot from usb ¶

sudo raspi-config
Advanced Options -> Boot Order -> B2 NVMe/USB
sudo reboot

# to get vendorId and deviceId
$ dmesg
$ sudo nano /boot/cmdline.txt
usb-storage.quirks=152d:1561:u console=serial0,115200 console=tty1 root=PARTUUID=fcf4cb94-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
$ echo program_usb_boot_mode=1 | sudo tee -a /boot/config.txt
# Check
$ mount | egrep "/([[:space:]]|boot)"

vcgencmd otp_dump | grep 17
17:1020000a=USB boot disabled
17:3020000a=USB boot enabled

sudo raspi-config
sudo rpi-update
sudo raspi-config --expand-rootfs

Trusted Key Problem ¶

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
8 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: https://packages.microsoft.com/repos/edge/dists/stable/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: https://download.sublimetext.com/apt/stable/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.

cd /etc/apt
sudo cp trusted.gpg trusted.gpg.d

Generate User Before Boot ¶

echo 'mypassword' | openssl passwd -6 -stdin | sudo tee -a /boot/userconf.txt
# /boot/userconf.txt
user:password-hash
# Enable ssh
touch /boot/ssh

Ruby¶

$ sudo apt-get install rbenv
$ echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> .bashrc
$ echo 'eval "$(rbenv init -)"' >> .bashrc
$ rbenv
$ git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
$ rbenv install --list
$ rbenv install 2.3.1
$ rbenv global 2.3.1

Server Images 64bit¶

https://downloads.raspberrypi.org/raspios_arm64/images/

Convert to server¶

(
  sudo apt --purge remove -y "x11-*"
  sudo apt --purge -y autoremove
  sudo apt update
  sudo apt upgrade -y
)

Swap ¶

Temporarily Stop Swap

sudo dphys-swapfile swapoff

Modify the size of the swap

sudo nano /etc/dphys-swapfile
CONF_SWAPSIZE=2048

Initialize Swap File

sudo dphys-swapfile setup

Start Swap

sudo dphys-swapfile swapon

Proxmox¶

See Proxmox.

Watchdog Timer ¶

ls -al /dev/watchdog*
crw------- 1 root root  10, 130 Nov  3  2016 /dev/watchdog
crw------- 1 root root 252,   0 Nov  3  2016 /dev/watchdog0

# /etc/systemd/system.conf
RuntimeWatchdogSec=10
ShutdownWatchdogSec=10min

dmesg | grep -i watchdog
[    0.763148] bcm2835-wdt 3f100000.watchdog: Broadcom BCM2835 watchdog timer
[    1.997557] systemd[1]: Hardware watchdog 'Broadcom BCM2835 Watchdog timer', version 0
[    2.000728] systemd[1]: Set hardware watchdog to 10s.

References¶