Network Policy

If you are running Cilium on Kubernetes, you can benefit from Kubernetes distributing policies for you. In this mode, Kubernetes is responsible for distributing the policies across all nodes and Cilium will automatically apply the policies. Three formats are available to configure network policies natively with Kubernetes:

Cilium supports running multiple of these policy types at the same time. However caution should be applied when using multiple policy types at the same time, as it can be confusing to understand the complete set of allowed traffic across multiple policy types. If close attention is not applied this may lead to unintended policy allow behavior.


For more information, see the official NetworkPolicy documentation.

Known missing features for Kubernetes Network Policy:

Feature Tracking Issue
ipBlock set with a pod IP


The CiliumNetworkPolicy is very similar to the standard NetworkPolicy. The purpose is provide the functionality which is not yet supported in NetworkPolicy. Ideally all of the functionality will be merged into the standard resource format and this CRD will no longer be required.

The raw specification of the resource in Go looks like this:

type CiliumNetworkPolicy struct {
        metav1.TypeMeta `json:",inline"`
        // +optional
        Metadata metav1.ObjectMeta `json:"metadata"`

        // Spec is the desired Cilium specific rule specification.
        Spec *api.Rule `json:"spec,omitempty"`

        // Specs is a list of desired Cilium specific rule specification.
        Specs api.Rules `json:"specs,omitempty"`

        // Status is the status of the Cilium policy rule
        // +optional
        Status CiliumNetworkPolicyStatus `json:"status"`

Describes the policy. This includes:

  • Name of the policy, unique within a namespace
  • Namespace of where the policy has been injected into
  • Set of labels to identify resource in Kubernetes
Field which contains a Rule Basics
Field which contains a list of Rule Basics. This field is useful if multiple rules must be removed or added automatically.
Provides visibility into whether the policy has been successfully applied


See Layer 3 Examples for a detailed list of example policies.


CiliumClusterwideNetworkPolicy is similar to CiliumNetworkPolicy, except (1) policies defined by CiliumClusterwideNetworkPolicy are non-namespaced and cluster-scoped, and (2) it enables the use of Node Selector. Internally the policy is composed of CiliumNetworkPolicy itself and thus the effects of this policy specification are also same.

The raw specification of the resource in go looks like this:

type CiliumClusterwideNetworkPolicy struct {

        // Status is the status of the Cilium policy rule
        // +optional
        // The reason this field exists in this structure is due a bug in the k8s code-generator
        // that doesn't create a `UpdateStatus` method because the field does not exist in
        // the structure.
        Status CiliumNetworkPolicyStatus `json:"status"`