kubernetes - K3S on Raspberry Pi 4 - kubectl get pods runs into timeout

Question

Problem

When I connect a k3s agent to the server and run "kubectl get nodes" on the server. I get the following error:

root@k3s-master:/home/marc# kubectl get nodes
Error from server (Timeout): the server was unable to return a response in the time allotted, but may still be processing the request (get nodes)

But if the server is standalone, I can easily run "kubectl get nodes".

CPU utilisation on the server stays about 30-40%. And RAM usage is at 583M of 3.74G.

Specs

• 2x Raspberry Pi 4b with 4GB RAM
• Fresh install of raspbian lite (buster)
• Enabled legacy iptables and cgroups

K3S Installation

On the server, I've done:

curl -sfL https://get.k3s.io | sh -

And on the agent:

curl -sfL https://get.k3s.io | K3S_URL=https://k3s-master:6443 K3S_TOKEN=<token> sh -

Thanks in advance, it drives me crazy!

question from:https://stackoverflow.com/questions/65648589/k3s-on-raspberry-pi-4-kubectl-get-pods-runs-into-timeout

Answer 1

Thanks to stack overflows related question feature, I've stumbled upon this question: PI4 k3s install server currently unable to handle the request

There seems to be an issue regarding cgroup memory failures with buster kernel 5.4.x

Edit

Adding the cgroup didnt helped, so I switched to Ubuntu 20.05 and its working now.