feat(kubernetes-agent): add optional hostNetwork for NFS server pod #508
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Add persistence.nfs.hostNetwork option to allow the NFS server pod to use the host network. This is useful in environments with network policies that block traffic from the NFS CSI driver to the NFS server pod. When the NFS CSI driver (which runs with hostNetwork: true) attempts to mount the NFS volume, the traffic appears to come from the node IP rather than a pod. Network policies using namespaceSelector cannot match this traffic, causing mount failures with 'time out' or 'Name or service not known' errors. Setting hostNetwork: true on the NFS server pod allows it to bypass network policy enforcement, enabling successful NFS mounts in restricted environments.
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Summary
Add
persistence.nfs.hostNetworkoption to allow the NFS server pod to use the host network.Problem
When network policies are applied to a namespace, the NFS CSI driver cannot mount the NFS volume because:
hostNetwork: true, so traffic appears to come from node IPsnamespaceSelectorcannot match traffic from node IPsSolution
Add an optional
hostNetworksetting for the NFS server pod. When enabled:hostNetwork: truednsPolicy: ClusterFirstWithHostNetto ensure cluster DNS still worksUsage
Changes
charts/kubernetes-agent/templates/nfs-statefulset.yaml: Add conditional hostNetwork and dnsPolicycharts/kubernetes-agent/values.yaml: Addpersistence.nfs.hostNetworkoption (default: false)