when using k3sup to setup k3s with raspbian buster on raspberrypi 4b it works (armv7 architecture; with reference below). with an exact similar similar setup procedure of agent nodes on pi zeros, and running raspi-config, it errors with the following failures:
- CONFIG_CGROUP_CPUACCT: enabled
- CONFIG_CGROUP_DEVICE: enabled
- CONFIG_CGROUP_FREEZER: enabled
- CONFIG_CGROUP_SCHED: enabled
- CONFIG_CPUSETS: missing (fail)
- CONFIG_MEMCG: enabled
- CONFIG_KEYS: enabled
- CONFIG_VETH: enabled (as module)
a possible explanation may be that zeros are using armv6 architecture which have some reports mentioning that they may not be supported. There are also conflicting reports that it has been made possible to run on pi zeros.
~excerpt from : https://groups.google.com/g/clusterhat/c/iUcfVqJ1aL0
pi@cnat:~ $ kubectl get node -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
p4 Ready <none> 20m v1.17.2+k3s1 172.19.181.4 <none> Raspbian GNU/Linux 10 (buster) 4.19.97+ containerd://1.3.3-k3s1
p2 Ready <none> 5m46s v1.17.2+k3s1 172.19.181.2 <none> Raspbian GNU/Linux 10 (buster) 4.19.97+ containerd://1.3.3-k3s1
p1 Ready <none> 12m v1.17.2+k3s1 172.19.181.1 <none> Raspbian GNU/Linux 10 (buster) 4.19.97+ containerd://1.3.3-k3s1
cnat Ready master 31m v1.17.2+k3s1 192.168.5.234 <none> Raspbian GNU/Linux 10 (buster) 4.19.97-v7+ containerd://1.3.3-k3s1
p3 Ready <none> 114s v1.17.2+k3s1 172.19.181.3 <none> Raspbian GNU/Linux 10 (buster) 4.19.97+ containerd://1.3.3-k3s1
Is there any configuration or that will enable k3s (agent) to successfully operate on raspberry pi zero (w)? If so what is the node os/version and k3s setup for this? Any help appreciated as this has been some uphill battle.
(following reference : https://alexellisuk.medium.com/walk-through-install-kubernetes-to-your-raspberry-pi-in-15-minutes-84a8492dc95a )
Unfortunately, k3s can't run on Pi Zero because Pi zero is based on ARMv6 and K3S only support ARM starting ARMv7. (see this Github issue : https://github.com/k3s-io/k3s/issues/2699).
If you want a Raspberry Pi to run K3s, use a Raspberry Pi with an ARMv7 CPU (Ex : Raspberry pi 4).
In order to get past the errors you are seeing on the pi zero devices, I added the following to the /boot/cmdline.txt line "cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory".
However after starting and running a short while the k3s agent service will cord dump.