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Longhorn

Versions Supported​

Longhorn with Harbor Registry in Airgap Environments​

When you use the Longhorn pack in an airgapped environment, the Harbor Edge-Native Config pack is required for your cluster to function. However, you must change the image references in the Longhorn pack to use the base URL of the local Harbor registry. Otherwise, the cluster will fail to deploy, with the longhorn-driver-deployer pod stuck in the Init state.

  1. Log in to Palette.

  2. From the left Main Menu, select Profiles.

  3. Select the cluster profile you use to deploy the cluster with Longhorn.

  4. In the pack YAML for the Longhorn pack, replace the base URL of each image referenced in the pack with the Harbor registry.

    For example, the following is a snippet of the Longhorn pack's YAML before and after you replace the base URL.

    pack:
      namespace: "longhorn-system"
      namespaceLabels:
        "longhorn-system":
          "pod-security.kubernetes.io/enforce=privileged,pod-security.kubernetes.io/enforce-version=v{{
          .spectro.system.kubernetes.version | substr 0 4 }}"
      content:
        images:
          - image: gcr.io/spectro-images-public/packs/csi-longhorn/1.5.3/longhorn-engine:v1.5.3
          - image: gcr.io/spectro-images-public/packs/csi-longhorn/1.5.3/longhorn-manager:v1.5.3
          - image: gcr.io/spectro-images-public/packs/csi-longhorn/1.5.3/longhorn-ui:v1.5.3
          - image: gcr.io/spectro-images-public/packs/csi-longhorn/1.5.3/longhorn-instance-manager:v1.5.3
          - image: gcr.io/spectro-images-public/packs/csi-longhorn/1.5.3/longhorn-share-manager:v1.5.3

    Refer to Harbor Edge-Native Config pack documentation to learn how to find the node IP and port of the Harbor registry. If you have given the registry a domain name, you can use the domain name instead of the node IP.

Known Issues​

The following known issues exist in the Longhorn 1.5.X release.

  • A deadlock may occurs when using a RWX volume and a cluster node is recreated. This issue is disclosed as a known issue in the Longhorn GitHub repository] and a fix is on the roadmap. Workarounds provided by the community can be found in the issue discussion.

  • Rebooting or upgrading a cluster with Longhorn has a small possibility of triggering a race condition that causes pods to be stuck in the terminating state. This issue is related to a known issue in the Longhorn GitHub repository and a fix is on the roadmap.

  • Using Longhorn together in airgap environments with an external registry requires you to update the Longhorn pack image references to use the base URL of the Harbor registry. For more information, refer to Longhorn Deployer Stuck in Init State in Airgap Environments section.

Terraform​

Use the following Terraform snippet to reference the Longhorn pack in your Terraform template. Update the version number as needed.

data "spectrocloud_registry" "public_registry" {
  name = "Public Repo"
}

data "spectrocloud_pack_simple" "csi-longhorn-addon" {
  name    = "csi-longhorn"
  version = "1.6.0"
  type = "helm"
  registry_uid = data.spectrocloud_registry.public_registry.id
}