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34 lines
776 B
Markdown
34 lines
776 B
Markdown
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# Limit `NodePort` services
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A Kubernetes service of type `NodePort` uses a host port (on every node in the cluster) to receive traffic from any source.
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Kubernetes Network Policies cannot be used to control traffic to host ports.
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Although NodePort services can be useful, their use should be limited to services with additional upstream security checks.
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## Policy YAML
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[disallow_node_port.yaml](best_practices/disallow_node_port.yaml)
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````yaml
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apiVersion: kyverno.io/v1alpha1
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kind: ClusterPolicy
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metadata:
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name: disallow-node-port
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spec:
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rules:
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- name: disallow-node-port
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match:
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resources:
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kinds:
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- Service
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validate:
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message: "Disallow service of type NodePort"
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pattern:
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spec:
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type: "!NodePort"
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````
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