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Cilium CNI

Cilium is used as the Container Network Interface (CNI) for this cluster, replacing the default kube-proxy.

Version

  • Cilium: 1.18.5

Installation

helm repo add cilium https://helm.cilium.io/
helm repo update

helm install cilium cilium/cilium \
  --version 1.18.5 \
  --namespace kube-system

Sysctl Override

Cilium requires rp_filter to be disabled on its interfaces to prevent mangled packets from being dropped. See system/sysctl.d/99-zzz-override_cilium.conf:

-net.ipv4.conf.lxc*.rp_filter = 0
-net.ipv4.conf.cilium_*.rp_filter = 0
net.ipv4.conf.all.rp_filter = 0

Verification

# Check Cilium pods are running
kubectl -n kube-system get pods -l app.kubernetes.io/name=cilium-agent

# Check Cilium status
kubectl -n kube-system exec ds/cilium -- cilium status