Raspberry Pi 4 Setup

pi4-setup.md

bootstrap

• burn raspbian image to sdcard
• remove and insert sdcard
  • touch /boot/ssd
• repeat for all sdcards

network pin (optional)

• grab both (eth and wlan) mac addresses from your raspberries
• plan your network

  • Device       | hostname   | MAC               | IP
    --------------------------------------------------------------
    RPI 1 (ETH)  | pi-node-01 | 00-00-00-00-00-01 | 192.168.15.11
    RPI 1 (WLAN) | pi-node-01 | 00-00-00-00-00-02 | 192.168.15.21
    --------------------------------------------------------------
    RPI 2 (ETH)  | pi-node-02 | 00-00-00-00-00-03 | 192.168.15.12
    RPI 2 (WLAN) | pi-node-02 | 00-00-00-00-00-04 | 192.168.15.22
    --------------------------------------------------------------
    RPI 3 (ETH)  | pi-node-03 | 00-00-00-00-00-05 | 192.168.15.13
    RPI 3 (WLAN) | pi-node-03 | 00-00-00-00-00-06 | 192.168.15.23
    --------------------------------------------------------------
    RPI 4 (ETH)  | pi-node-04 | 00-00-00-00-00-07 | 192.168.15.14
    RPI 4 (WLAN) | pi-node-04 | 00-00-00-00-00-08 | 192.168.15.24
    --------------------------------------------------------------
    RPI 5 (ETH)  | pi-node-05 | 00-00-00-00-00-09 | 192.168.15.15
    RPI 5 (WLAN) | pi-node-05 | 00-00-00-00-00-0A | 192.168.15.25
    --------------------------------------------------------------
    RPI 6 (ETH)  | pi-node-06 | 00-00-00-00-00-0B | 192.168.15.16
    RPI 6 (WLAN) | pi-node-06 | 00-00-00-00-00-0C | 192.168.15.26
    --------------------------------------------------------------
    RPI 7 (ETH)  | pi-node-07 | 00-00-00-00-00-0D | 192.168.15.17
    RPI 7 (WLAN) | pi-node-07 | 00-00-00-00-00-0E | 192.168.15.27
    --------------------------------------------------------------
    RPI 8 (ETH)  | pi-node-08 | 00-00-00-00-00-0F | 192.168.15.18
    RPI 8 (WLAN) | pi-node-08 | 00-00-00-00-00-10 | 192.168.15.28
    --------------------------------------------------------------
    

• for each network interface, assign the MAC with a fixed ip for both eth and wlan on your router

pi setup

system updates

• login as pi with password raspberry
• sudo apt-get update
• sudo apt-get upgrade

update user password

• sudo passwd
  • set a new password and take note

configure raspberry

• sudo raspi-config
• network options
  • hostname
    • fill
  • wireless lan
    • fill
• advanced options
  • expand filesystem
  • memory split -> set to 16
• localisation options
  • timezone
    • fill

allow temprary root login

• sudo nano /etc/ssh/sshd_config
  • set PermitRootLogin to yes
• sudo passwd root
  • set the new password
• sudo reboot

rename default user and groups

• login as root with the new password
• usermod -l wolfulus pi
• groupmod -n wolfulus pi
• mv /home/pi /home/wolfulus
• usermod -d /home/wolfulus wolfulus
• history -c
• logout

configure user access and disable root (ssh)

• login as wolfulus with pi password
• mkdir -p ~/.ssh
• chmod 700 ~/.ssh
• curl -L https://github.com/wolfulus.keys >> ~/.ssh/authorized_keys
• chmod 644 ~/.ssh/authorized_keys
• sudo nano /etc/ssh/sshd_config
  • comment PermitRootLogin yes line
  • set PubkeyAuthentication to yes
  • set RSAAuthentication to yes
  • set AuthorizedKeysFile to .ssh/authorized_keys
  • set PasswordAuthentication to no
  • set PermitEmptyPasswords to no
  • set PrintLastLog to no
  • set Banner to /var/banner

update motd

• sudo apt-get install figlet
• sudo bash -c "echo wolfulus.com | figlet >> /var/banner"
• sudo nano /etc/update-motd.d/10-uname
  • update as needed, usually

    #!/bin/sh
    hostname | figlet
    uname -snrvm
    

• sudo service ssh restart
• history -c

done

• repeat for every machine

k3s setup

(for raspbian)

• append cgroup_memory=1 cgroup_enable=memory to /boot/cmdline.txt

• sudo iptables -F

• sudo update-alternatives --set iptables /usr/sbin/iptables-legacy

• sudo update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy

• sudo reboot

server

• login into master
• curl -sfL https://get.k3s.io | sh -s - --write-kubeconfig-mode 644 --flannel-iface tailscale0
  • append --disable traefik --disable servicelb to be able to use nginx and/or any hostport ingress controller instead
  • append --disable local-storage to be able to change the location local-storage will create PVs
    • use helm to install local-path-provisioner
• sudo chown wolfulus:wolfulus /etc/rancher/k3s/k3s.yaml
• sudo cat /var/lib/rancher/k3s/server/node-token
  • take note

agents

• login into the worker machine
• curl -sfL https://get.k3s.io | K3S_URL=https://<SERVER-IP>:6443 K3S_TOKEN=<TOKEN> sh -s - --flannel-iface tailscale0
• repeat for every worker machine

check

• login into master
• kubectl get nodes

inlets tailscale

• just install tailscale on each node and have an agent (or server) running it too on a cloud provider instead.