Hi

 

There are some guides on how to install Kubernetes on a Raspberry Pi cluster. I am trying to build such a cluster with Asus Tinker Boards as I think that these would make an even more powerful demo system. Unfortunately there are no guides for running Kubernetes on Tinker Boards.

 

I am using Armbian Ubuntu Xenial mainline image which is running very stable.

uname -a
Linux tinkerboard 4.11.0-rockchip #19 SMP PREEMPT Thu May 4 16:08:16 CEST 2017 armv7l armv7l armv7l GNU/Linux

 

When initializing the cluster with "kubeadm init" it runs into the following fatal error during preflight checks of the system:

[preflight] Some fatal errors occurred:
        unexpected kernel config: CONFIG_NETFILTER_XT_MATCH_COMMENT

and 

CONFIG_NETFILTER_XT_MATCH_COMMENT: not set

Is this an option that has to be included into kernel at compile time? If yes, I think this would be a useful option to be contained in the downloadable image - at least for users of Kubernetes.

 

Thanks for any support or hint.

 

Tom 

I got this error as well. Based on this message:

 

[preflight] If you know what you are doing, you can skip pre-flight checks with `--skip-preflight-checks`

 

I decided I knew what I was doing and ran:

# kubeadm init --skip-preflight-checks

Not sure if everything is working yet, but that error is resolved.

 

How's your cluster going? I too am looking at building out a small cluster with tinkerboards.

Added:

https://github.com/armbian/build/commit/72b42b5b10495d16562cd87bfbb889a054ced2a1

Awesome!

 

Should this come through in the nightly builds? https://dl.armbian.com/tinkerboard/nightly/

Can anyone confirm if this flag is built into the nightly builds.  I would like to build out a K8s cluster with 5x Tinker boards for some internal testing.

Thanks,
Scott

It will need built at the moment, it doesn't look like Tinker Board is in the nightly build list.  That isn't something I've toyed with, so I will defer to @Igor

A whole nightly building is on hold until upcoming bugfix release. Since I am currently playing out with Tinkerboard, I will make them and upload probably once during a day. If this is not fast enough, you need to setup build environment.

Edit:

https://dl.armbian.com/tinkerboard/Ubuntu_xenial_next_desktop_nightly.7z

https://dl.armbian.com/tinkerboard/Ubuntu_xenial_next_nightly.7z

 

 

The nightly you uploaded, and linked is working.  Thank you.

root@P3X-422:~# kubectl get po --all-namespaces
NAMESPACE     NAME                              READY     STATUS             RESTARTS   AGE
default       hypriot-5747f86854-4c25v          1/1       Running            0          4h
default       hypriot-5747f86854-9nk45          1/1       Running            0          4h
default       hypriot-5747f86854-dvsj7          1/1       Running            0          4h
kube-system   etcd-p3x-422                      1/1       Running            0          5h
kube-system   kube-apiserver-p3x-422            1/1       Running            0          5h
kube-system   kube-controller-manager-p3x-422   1/1       Running            0          5h
kube-system   kube-dns-66ffd5c588-cfsft         3/3       Running   0        5h
kube-system   kube-flannel-ds-867wz             2/2       Running            0          5h
kube-system   kube-flannel-ds-hbt8v             2/2       Running            0          5h
kube-system   kube-flannel-ds-vxdj2             2/2       Running            0          5h
kube-system   kube-proxy-f4f6n                  1/1       Running            0          5h
kube-system   kube-proxy-gmtpq                  1/1       Running            0          5h
kube-system   kube-proxy-sfm4k                  1/1       Running            0          5h
kube-system   kube-scheduler-p3x-422            1/1       Running            0          5h

Hi all,

 

I landed here (via Google) with the same error. Does the error prevent K8s from working correctly? I find the networking driver from Weaveworks to work better with arm boards than Flannel. I'd also recommend using a stock OS over Hypriot. I wrote a guide you guys may enjoy:

 

https://blog.alexellis.io/serverless-kubernetes-on-raspberry-pi/

 

I'm in the process of testing it all out on the Tinkerboard. I think it'll work fine once past this error and gives a sense of purpose to the cluster. 

 

Regards,

 

Alex