By Default, Longhorn uses the default Kubernetes cluster CNI network that is limited to a single interface and shared with other workloads cluster-wide. In case you have a situation where network segregation is needed, Longhorn supports isolating Longhorn in-cluster data traffic with the Storage Network setting.

The Storage Network setting takes Multus NetworkAttachmentDefinition in format.

You can refer to for how to install and set up Multus NetworkAttachmentDefintion.

Applying the setting will add annotation and recreate all existing instance-manager, and backing-image-manager pods. Longhorn will apply the same annotation to any new instance-manager, backing-image-manager, and backing-image-data-source pods.

Setting Storage Network

The Multus NetworkAttachmentDefinition network for the storage network setting must be reachable in pods across different cluster nodes.

You can verify by creating a simple DaemonSet and try ping between pods.

Follow the to set Storage Network by changing the value for the default setting

Setting Storage Network After Longhorn Installation

Set the setting .

History

Available since v1.3.0