What does everyone else run on their cluster?

[Ben Heininger]

What is everyone else using their cluster for?
Just trying to get other ideas as to what I can do with my cluster.

I got Docker swarm running mine and have used it to learn the basics of Ansible.
I wanted to learn Kubernetes but couldnt get it running since I only had RPi Zero 1.3s
Now that they are available I have some RPi Zero 2Ws on order to replace the 1.3s.
Ben

[Tom Szolyga]

I would like to learn more about how the RPI Zero 2Ws work in your Cluster Hat.  I want to upgrade mine.

[michael...@netscape.net]

My Cluster hat got expanded. It now includes the following:

Four Pi Zeros            -- Raspbian

One Pi 3b+                -- Raspbian (Controller)

Four Pi 3b+               -- Hypriot OS   -- I Could add another four quite easily. Only cash flow is the limiting factor.

One Banana Pi Pro  --  Armbian

While they all run Docker Swarm, I have them processing university data for 4 BOINC projects.

This eclectic little cluster has been running for years, (Four plus?)  now almost non-stop.

[Ben Heininger]

Michael, 

Thank you, that's interesting work.

Tom,

I tried transferring the sd card from the zero 1.3 to the zero 2w and it worked. The only downside was that it was still only 32 bit os. 

I downloaded the 64bit image for RPi1 and re-imaged the sd card, plugged it all back together and it fired up fine. I don't have any further information as I haven't found a valuable use for it yet.

Hopefully when I have 4x RPi Zero 2ws I can try Kubernetes again.

I also dont know what I can do with my original Zero 1.3s, maybe I need another clusterhat and another normal Pi?

[Ben Heininger]

Hi,
I finally have it all setup.
RPi4 4gb
4x RPi Zero 2w
Argon One m.2

128gb nvme ssd

Clusterhat 2.5

4 passive rpi zero heasinks
A large passive heatsink for the RPi4

7cm cpu fan

I have read a few tutorials about how to install kubernetes on a cluster but they all recommend not using sd cards as Kubernetes does a lot of reading and writing to them.

None of these tutorials describe how to do that though.

Is there some docimentation about how I run the zeros without sd cards?
Can I utilize the m.2 as a central pxe boot location for all the Pis?
Do I need to make the RPi4 boot from the m.2 and the Zeros to pxe boot?

What's the best way to approach this?

[tsw...@gmail.com]

Nice setup. Thank you for the pictures!

I have 3 clusterhats with 3 Model B bases each with 4 Zeros (not Zero 2s).

One I use for MPI programming in C and Python (using mpich and an NFS shared home directory).

One I use for Docker Swarm (mixing arm7 and arm6 executables in an image).

One I use for experimenting and it has not gotten a perminant role yet.

I have  run a Kubernetes cluster on a 6 stack of 3Bs and a Docker Swarm on a 4 stack of 3Bs.

They all boot from the SSDs.

I have also run both glusterfs and longhorn from the same SSDs as the host OS (not recommended for production).

I have not had any SSD issues to date but the clusters are not up 24x7 (longest continuous uptime about 1 month).

I have not tried Kubernetes (k3s version) on a clusterhat--I believe I would have to upgrade to Zero 2s before that is possible.

There are two websites that have been particularly useful in case you haven't stumbled across them

https://picluster.ricsanfre.com/docs/home/

https://rpi4cluster.com/

Best regards.

[Ian Goldsmith]

https://medium.com/@dhuck/the-missing-clusterhat-tutorial-45ad2241d73 you can but probably slower, see link.

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[Patricio Diaz]

I run k3s on my cluster, but had to look for something else besides raspberry pi zeros for the nodes. Check this post
https://dev.to/padiazg/from-pi-to-sky-how-my-kubernetes-cluster-evolved-beyond-raspberry-nf2
Now I'm working to find out if is it possible to use the Orange Pi Zero 2W or the Radxa Zeros, as they come with more RAM than any Rpi Zero available, not to mention the processors.