diff --git a/k8s/c3/README.md b/k8s/c3/README.md
new file mode 100644
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--- /dev/null
+++ b/k8s/c3/README.md
@@ -0,0 +1,4 @@
+## Test cluster c3
+
+* Raspberry PI (arm64)
+* Debian/Ubuntu
diff --git a/k8s/c3/kubeadm.yaml b/k8s/c3/kubeadm.yaml
new file mode 100644
index 0000000..6f27c2d
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+++ b/k8s/c3/kubeadm.yaml
@@ -0,0 +1,8 @@
+# kubeadm-config.yaml
+kind: ClusterConfiguration
+apiVersion: kubeadm.k8s.io/v1beta2
+kubernetesVersion: v1.21.1
+networking:
+  dnsDomain: c3.k8s.ooo
+  podSubnet: 2a0a:e5c0:13:e3::/64
+  serviceSubnet: 2a0a:e5c0:13:e4::/108