Microk8s not on default network interface

General Discussions microk8s
1

Hello,
I setup a kubernetes cluster using microk8s on a set of machines with two network interfaces.
I noticed that both the k8s services and the pods use the non-default interface, which is my case is the slowest one.
How can I tell microk8s and the pods to use a specific interface?
Even a solution where just the pods use the non-default network interface is welcome.

I apologize if this is trivial or if this has been discussed already, but I could not find anything that solved my problem.
Thank you

2

I personally haven’t tried this, but i think you can tell calico to use which interface using this env variable IP_AUTODETECTION_METHOD
You may want to edit the file in /var/snap/microk8s/current/args/cni-network/cni.yaml then do kubectl apply.
More info from calico site. Configuring calico/node

3

Thank you @balchua1 , I am going to try this right away.
Is there a way to check which interface is being used, other than spawning two pods and sniffing the traffic between the two?
Thank you

4

Maybe using calicoctl (calico cli) to inspect calico may help. Just guessing here. :blush:

5

Hello, for future reference: the trick seems to have worked.
I changed what suggested on my master node. Then, I find that is sufficient to do microk8.add using the “right” interface and the calico on the worker node is already going to be properly configured.
Thank you @balchua1 !