Friday, 29 April 2022

Having fun and games with Kubernetes networking

I'd forgotten how much I simply enjoy the opportunities for hacking - in the original naive sense of the word - that Kubernetes (K8s) offers.

Today I've been working to find out why CoreDNS didn't work in my cluster - clue, it was containerd that did it

However, I then started seeing: -

failed to allocate for range 0: no IP addresses available in range set: 10.48.131.1-10.48.131.62

from my CoreDNS pods, having "fixed" containerd.

Thankfully, Google Cloud have a doc for that: -

Pods display failed to allocate for range 0: no IP addresses available in range set error message

In part, it required me to stop containerd and kubelet, and clear out the previously defined IP address range: -

mkdir /var/lib/cni/networks

Once I did this, and restarted containerd and kubelet, we're back in the game !

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