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hack: ATE_KIND_RESERVED_CPU reserves kubelet and system CPU on kind nodes #2495

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Merged
Benjamin Elder (BenTheElder) merged 2 commits into from
Oct 15, 2026
Merged

hack: ATE_KIND_RESERVED_CPU reserves kubelet and system CPU on kind nodes #2495

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add321d
hack: KIND_RESERVED_CPU reserves kubelet and system CPU on kind nodes
dims Oct 12, 2026
4af363c
hack: rename the kubelet reservation knob to ATE_KIND_RESERVED_CPU
dims Oct 15, 2026
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16 changes: 14 additions & 2 deletions hack/create-kind-cluster.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -29,8 +29,9 @@ if [[ $# -gt 0 ]]; then
echo "Creates the kind cluster '${KIND_CLUSTER_NAME}' and a local registry container on port ${reg_port}."
echo
echo "Configured through the environment:"
echo " KIND_CLUSTER_NAME Name of the cluster to create (default: kind)."
echo " IP_FAMILY Address families for pods and Services: ipv4, ipv6 or dual (default: ipv4)."
echo " KIND_CLUSTER_NAME Name of the cluster to create (default: kind)."
echo " IP_FAMILY Address families for pods and Services: ipv4, ipv6 or dual (default: ipv4)."
echo " ATE_KIND_RESERVED_CPU CPU reserved for the kubelet and the system on each node (default: none)."
exit 0
;;
esac
Expand Down Expand Up @@ -124,6 +125,17 @@ kubeadmConfigPatches:
serializeImagePulls: false
maxParallelImagePulls: 4
EOF
# Hundreds of sandboxes per node can starve the kubelet's node heartbeat; after
# the 300 s toleration the taint manager evicts every pod on the node. Opt in to
# a CPU reservation for the kubelet and the system, e.g. ATE_KIND_RESERVED_CPU=2.
if [[ -n "${ATE_KIND_RESERVED_CPU:-}" ]]; then
cat <<EOF >> "${ROOT}/bin/kind-config.yaml"
systemReserved:
cpu: "${ATE_KIND_RESERVED_CPU}"
kubeReserved:
cpu: "${ATE_KIND_RESERVED_CPU}"
EOF
fi

echo "Deleting existing kind cluster '${KIND_CLUSTER_NAME}' if it exists..."
"${ROOT}"/hack/kind.sh delete cluster --name "${KIND_CLUSTER_NAME}" || true
Expand Down
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