Look at all of these single-board computers lying around. What are they even doing? Literally nothing. Let’s put them to good use.
Raspberry Pi SD Cards
I got the latest Raspbian Buster Lite image and extracted the image. To make things easier on myself, I decided to enable SSH-on-first-boot for the image so that I can just brainlessly
dd everything onto SD cards.
First, I executed
losetup -P /dev/loop99 2021-01-11-raspios-buster-armhf-lite.img
to mount the image on a loop device. 99 was chosen because snapd makes a goddamn million loop devices.
lsblk returned the following:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT loop0 7:0 0 818.2M 1 loop /snap/android-studio/98 loop1 7:1 0 373.8M 1 loop /snap/anbox/186 ... loop47 7:47 0 135.7M 1 loop /snap/chromium/1466 loop99 7:99 0 1.8G 0 loop ├─loop99p1 259:7 0 256M 0 part └─loop99p2 259:8 0 1.5G 0 part ...
Perfect! Once that was done, it was a simple
mkdir -p /tmp/bootsd mount /dev/loop99p1 /tmp/bootsd touch /tmp/bootsd/ssh
and the SD card image was ready. To clean everything up:
umount /tmp/bootsd losetup -d /dev/loop99
Finally, I plugged in the SD cards one by one and flashed them with
dd bs=64M of=/dev/sdb if=2021-01-11-raspios-buster-armhf-lite.img
As soon as I booted each of them, and they were assigned DHCP addresses, I SSH’ed into them to change the password because security.
Orange Pi SD Card
The Orange Pi One was set up in a similar fashion, except that I got the Armbian image from the Orange Pi website (scroll like, really far for the OPi One).
Getting k3s on them
ssh-copy-id to install my public key on all of the devices for passwordless login, and then used k3sup for quickly installing k3s on them:
k3sup join --sudo --server-user rancher --user pi --server-ip <my server's address> --ip <the pi's address>
Forking multiple instances of k3sup made life easier.
So now, I have 7 whole nodes on my kubernetes cluster! Fear my power!
$ kubectl get node NAME STATUS ROLES AGE VERSION zerg-1 NotReady <none> 2d1h v1.19.7+k3s1 # rpi k3os-28502 Ready master 6d2h v1.19.5+k3s2 orangepi Ready <none> 4d10h v1.19.7+k3s1 # opi zerg2 Ready <none> 2d1h v1.19.7+k3s1 # rpi zerg3 Ready <none> 2d1h v1.19.7+k3s1 # rpi k3os-10009 Ready <none> 5d23h v1.19.5+k3s2 k3os-3502 Ready <none> 3h13m v1.19.5+k3s2
Please ignore the inconsistent dashing scheme on the zerg* series.
Now what are they running? …unfortunately, still, absolutely nothing. Once again, my k3s cluster is a solution looking for a problem.
In my next post, I’ll talk about my Grafana + Prometheus setup.