Implement Cilium with eBPF

[xunholy]

Details

https://github.com/cilium/cilium

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[xunholy]

arm64 image available for testing https://hub.docker.com/r/cilium/cilium-dev/tags

helm install cilium cilium/cilium
--version v1.9.0-rc0
--namespace kube-system
--set config.disableEnvoyVersionCheck=true
--set agent.image=docker.io/cilium/cilium-dev:v1.9.0-rc0
--set operator.image=docker.io/cilium/operator-dev:v1.9.0-rc0

cilium/proxy#25

Note: with the docker.io/cilium/cilium-dev:v1.9.0-rc0 you need to run cilium-agent with --disable-envoy-version-check=true - once the above PR is merged there's no need to run with that flag

[xunholy]

@carpenike has some examples here: https://github.com/carpenike/k8s-gitops/blob/master/ansible/kubeadm/roles/cni/tasks/cilium.yml

[xunholy]

Currently using Cilium 1.9.x in the cluster without issues. Calico had issues when trying to run the eBPF data plane however, with Cilium there were no troubles, and Hubble UI is also working as expected.