Harvester Upgrade Toolkit

Upgrade Toolkit is the primary component of Harvester Upgrade V2. It includes the Upgrade Manager and other auxiliary components that work together to facilitate the Upgrade V2 mechanics.

User Guide

Installation

Upgrade Toolkit is packaged as a Helm chart, Harvester Upgrade Manager. You can install it via Helm:

helm upgrade --install harvester-upgrade-manager harvester-upgrade-manager \
    --repo=https://charts.harvesterhci.io \
    --namespace=harvester-system

Kickstart an upgrade

Create a Version CR in the harvester-system namespace. This is almost the same as before.

cat <<EOF | kubectl apply -f -
apiVersion: harvesterhci.io/v1beta1
kind: Version
metadata:
  name: master-head
  namespace: harvester-system
spec:
  isoURL: https://releases.rancher.com/harvester/master/harvester-master-amd64.iso
EOF

Create an UpgradePlan CR with the desired version.

cat <<EOF | kubectl create -f -
apiVersion: management.harvesterhci.io/v1beta1
kind: UpgradePlan
metadata:
  generateName: hvst-upgrade-
spec:
  version: master-head
EOF

Additionally, upgrade can be triggered by creating an UpgradePlan CR with an existing ISO image on the cluster. The ISO image can be downloaded from a URL or uploaded to the cluster using the Harvester UI or CLI, and then referenced in the UpgradePlan CR.

For instance, to download the latest Harvester ISO from the releases page and use it for an upgrade, you can create a VirtualMachineImage CR as shown below:

cat <<EOF | kubectl create -f -
apiVersion: harvesterhci.io/v1beta1
kind: VirtualMachineImage
metadata:
  annotations:
    harvesterhci.io/os-upgrade-image: "True"
  name: harvester-master-amd64
  namespace: harvester-system
spec:
  backend: cdi
  displayName: harvester-master-amd64.iso
  sourceType: download
  url: https://releases.rancher.com/harvester/master/harvester-master-amd64.iso
  checksum: ""
  retry: 3
  targetStorageClassName: longhorn-static
EOF

Later, when the image is ready (actually, you don’t need to wait; the controller will automatically pick it up as soon as it becomes ready), you can create an UpgradePlan CR that references it (no need for referencing a Version CR):

cat <<EOF | kubectl create -f -
apiVersion: management.harvesterhci.io/v1beta1
kind: UpgradePlan
metadata:
  generateName: hvst-upgrade-
spec:
  image: harvester-master-amd64
EOF

Customized upgrades

Upgrade Toolkit supports upgrading a Harvester cluster using other container images that are not packaged in the ISO image for Upgrade Repo and also node-specific upgrade jobs. To do so, please see below.

When creating the UpgradePlan CR, specifying a different container image tag:

cat <<EOF | kubectl create -f -
apiVersion: management.harvesterhci.io/v1beta1
kind: UpgradePlan
metadata:
  generateName: hvst-upgrade-
spec:
  version: master-head
  upgrade: main-head
EOF

Or optionally, specify a few options to customize the upgrade process:

cat <<EOF | kubectl create -f -
apiVersion: management.harvesterhci.io/v1beta1
kind: UpgradePlan
metadata:
  generateName: hvst-upgrade-
spec:
  version: master-head
  upgrade: main-head
  imagePreloadOption:
    concurrency: -1
  nodeUpgradeOption:
    pauseNodes:
    - charlie-1-tink-system
    - charlie-3-tink-system
  restoreVM: true
EOF

For all the available options, see the output of kubectl explain upgradeplans.spec.

A successfully executed UpgradePlan looks like the following:

apiVersion: management.harvesterhci.io/v1beta1
kind: UpgradePlan
metadata:
  creationTimestamp: "2026-03-13T03:57:09Z"
  generateName: hvst-upgrade-
  generation: 3
  name: hvst-upgrade-864fh
  resourceVersion: "219468"
  uid: 24fde87d-491b-4af8-bafd-001fceb20a62
spec:
  imagePreloadOption:
    concurrency: 100
  nodeUpgradeOption: {}
  restoreVM: true
  upgrade: main-head
  version: v1.8.0-rc1
status:
  conditions:
  - lastTransitionTime: "2026-03-13T05:32:57Z"
    message: UpgradePlan has completed
    observedGeneration: 3
    reason: Succeeded
    status: "False"
    type: Progressing
  - lastTransitionTime: "2026-03-13T05:32:57Z"
    message: ""
    observedGeneration: 3
    reason: ReconcileSuccess
    status: "False"
    type: Degraded
  - lastTransitionTime: "2026-03-13T05:32:57Z"
    message: Entered one of the terminal phases
    observedGeneration: 3
    reason: Executed
    status: "False"
    type: Available
  currentPhase: Succeeded
  isoImageID: hvst-upgrade-864fh-iso
  nodeUpgradeStatuses:
    charlie-1-tink-system:
      state: ImageCleaned
    charlie-2-tink-system:
      state: ImageCleaned
    charlie-3-tink-system:
      state: ImageCleaned
  phaseTransitionTimestamps:
  - phase: Initializing
    phaseTransitionTimestamp: "2026-03-13T03:57:09Z"
  - phase: Initialized
    phaseTransitionTimestamp: "2026-03-13T03:57:09Z"
  - phase: ISODownloading
    phaseTransitionTimestamp: "2026-03-13T03:57:09Z"
  - phase: ISODownloaded
    phaseTransitionTimestamp: "2026-03-13T04:01:53Z"
  - phase: RepoCreating
    phaseTransitionTimestamp: "2026-03-13T04:01:53Z"
  - phase: RepoCreated
    phaseTransitionTimestamp: "2026-03-13T04:01:58Z"
  - phase: MetadataPopulating
    phaseTransitionTimestamp: "2026-03-13T04:01:58Z"
  - phase: MetadataPopulated
    phaseTransitionTimestamp: "2026-03-13T04:01:59Z"
  - phase: ImagePreloading
    phaseTransitionTimestamp: "2026-03-13T04:01:59Z"
  - phase: ImagePreloaded
    phaseTransitionTimestamp: "2026-03-13T04:12:00Z"
  - phase: ClusterUpgrading
    phaseTransitionTimestamp: "2026-03-13T04:12:00Z"
  - phase: ClusterUpgraded
    phaseTransitionTimestamp: "2026-03-13T04:27:15Z"
  - phase: NodeUpgrading
    phaseTransitionTimestamp: "2026-03-13T04:27:15Z"
  - phase: NodeUpgraded
    phaseTransitionTimestamp: "2026-03-13T05:30:42Z"
  - phase: CleaningUp
    phaseTransitionTimestamp: "2026-03-13T05:30:43Z"
  - phase: CleanedUp
    phaseTransitionTimestamp: "2026-03-13T05:32:56Z"
  - phase: Succeeded
    phaseTransitionTimestamp: "2026-03-13T05:32:57Z"
  previousVersion: v1.7.1
  provisionGeneration: 1
  releaseMetadata:
    harvester: v1.8.0-rc1
    harvesterChart: 1.8.0-rc1
    kubernetes: v1.35.2+rke2r1
    minUpgradableVersion: v1.7.0
    monitoringChart: 108.0.2+up77.9.1-rancher.11
    os: Harvester v1.8.0-rc1
    rancher: v2.14.0-alpha9
  version:
    isoChecksum: 3c6f98efc02959da524828b0c44273c8375b7815ce5fcf1c11581479d979daa6e184f3d20535041137282c3d2b4a12d9ba3ce847b051e9aecb5310b73f19523c
    isoURL: https://releases.rancher.com/harvester/v1.8.0-rc1/harvester-v1.8.0-rc1-amd64.iso

Upgrade-related events

During the upgrade, events are emitted at phase transitions and key points. View the events for an UpgradePlan with kubectl describe upgradeplans <upgradeplan-name>:

Events:
  Type     Reason                     Age                    From                      Message
  ----     ------                     ----                   ----                      -------
  Normal   PhaseTransition            105m                   upgradeplan-controller    Entering phase ISODownload
  Warning  ReconcileError             105m                   upgradeplan-controller    Pipeline error: VirtualMachineImage.harvesterhci.io "hvst-upgrade-864fh-iso" not found
  Normal   PhaseCompleted             100m                   upgradeplan-controller    Completed phase ISODownload
  Normal   PhaseTransition            100m                   upgradeplan-controller    Entering phase RepoCreate
  Warning  ReconcileError             100m                   upgradeplan-controller    Pipeline error: Deployment.apps "hvst-upgrade-864fh-repo" not found
  Warning  ReconcileError             100m                   upgradeplan-controller    Pipeline error: Service "hvst-upgrade-864fh-repo" not found
  Normal   PhaseCompleted             100m                   upgradeplan-controller    Completed phase RepoCreate
  Normal   PhaseTransition            100m                   upgradeplan-controller    Entering phase MetadataPopulate
  Normal   PhaseCompleted             100m                   upgradeplan-controller    Completed phase MetadataPopulate
  Normal   PhaseTransition            100m                   upgradeplan-controller    Entering phase ImagePreload
  Warning  ReconcileError             100m                   upgradeplan-controller    Pipeline error: Plan.upgrade.cattle.io "hvst-upgrade-864fh-image-preload" not found
  Normal   PhaseCompleted             90m                    upgradeplan-controller    Completed phase ImagePreload
  Normal   PhaseTransition            90m                    upgradeplan-controller    Entering phase ClusterUpgrade
  Normal   PhaseCompleted             75m                    upgradeplan-controller    Completed phase ClusterUpgrade
  Normal   PhaseTransition            75m                    upgradeplan-controller    Entering phase NodeUpgrade
  Normal   RestoreVMConfigMapCreated  63m                    vm-live-migrate-detector  ConfigMap harvester-system/hvst-upgrade-864fh-restore-vm created
  Normal   VMShutdownCompleted        63m                    vm-live-migrate-detector  Shutdown completed for 0 VM(s) on node charlie-1-tink-system, success: 0, failed: 0
  Normal   VMShutdownCompleted        39m                    vm-live-migrate-detector  Shutdown completed for 1 VM(s) on node charlie-2-tink-system, success: 1, failed: 0
  Normal   RestoreVMCompleted         26m                    restore-vm                Restored 1 VMs for node charlie-2-tink-system during upgrade hvst-upgrade-864fh, success: 1, failed: 0
  Normal   VMShutdownCompleted        25m                    vm-live-migrate-detector  Shutdown completed for 1 VM(s) on node charlie-3-tink-system, success: 1, failed: 0
  Warning  ReconcileError             12m                    upgradeplan-controller    Pipeline error: waiting for Rancher to complete node upgrades: secret custom-58afebea1719-machine-plan still has rke.cattle.io/post-drain annotation
  Normal   PhaseCompleted             12m                    upgradeplan-controller    Completed phase NodeUpgrade
  Normal   PhaseTransition            12m                    upgradeplan-controller    Entering phase ImageCleanup
  Warning  ReconcileError             12m                    upgradeplan-controller    Pipeline error: Plan.upgrade.cattle.io "hvst-upgrade-864fh-image-cleanup" not found
  Normal   RestoreVMCompleted         11m                    restore-vm                Restored 1 VMs for node charlie-3-tink-system during upgrade hvst-upgrade-864fh, success: 1, failed: 0
  Normal   PhaseCompleted             9m50s (x2 over 9m51s)  upgradeplan-controller    Completed phase ImageCleanup
  Normal   UpgradeSucceeded           9m50s (x2 over 9m50s)  upgradeplan-controller    Upgrade completed successfully

User-facing annotations

The following annotations can be set on an UpgradePlan CR to skip or override specific pre-flight checks.

Annotation	Value	Scope	Description
`management.harvesterhci.io/skip-webhook`	`"true"`	Webhook (create)	Bypasses all create-time validation checks
`management.harvesterhci.io/skip-single-replica-detached-vol`	`"true"`	Webhook (create)	Skips the detached single-replica Longhorn volume check (active single-replica volumes are still blocked)
`management.harvesterhci.io/allow-deletion`	`"true"`	Webhook (delete)	Allows deletion of a progressing UpgradePlan (hard-blocked during `ClusterUpgrading` and `NodeUpgrading` phases regardless)
`management.harvesterhci.io/skip-garbage-collection-threshold-check`	`"true"`	Controller (init phase)	Skips the kubelet disk-space / image GC threshold pre-flight check
`management.harvesterhci.io/min-certs-expiration-in-day`	Integer > 0	Controller (init phase)	Overrides the minimum certificate expiration window in days (default: 7)
`management.harvesterhci.io/upgrade-toolkit-image`	Image repo+name	Controller (all phases)	Overrides the default upgrade-toolkit container image (`rancher/harvester-upgrade-toolkit`); tag is still controlled by `spec.upgrade`

Example usage:

cat <<EOF | kubectl create -f -
apiVersion: management.harvesterhci.io/v1beta1
kind: UpgradePlan
metadata:
  generateName: hvst-upgrade-
  annotations:
    management.harvesterhci.io/skip-single-replica-detached-vol: "true"
    management.harvesterhci.io/min-certs-expiration-in-day: "3"
spec:
  version: master-head
EOF

Upgrade Workflow

The upgrade lifecycle is driven by a phase-based state machine. An UpgradePlan CR progresses through a strict sequence of phases (tracked in status.currentPhase). Each phase has an active (...ing) and completed (...ed) value. Certain phases can transition directly to Failed on unrecoverable errors (see diagram below).

Overall Phase Progression

stateDiagram-v2
    [*] --> Initialize
    Initialize --> ISODownload
    ISODownload --> RepoCreate
    RepoCreate --> MetadataPopulate
    MetadataPopulate --> ImagePreload
    ImagePreload --> ClusterUpgrade
    ClusterUpgrade --> NodeUpgrade
    NodeUpgrade --> ImageCleanup
    ImageCleanup --> Succeeded

    Initialize --> Failed
    ISODownload --> Failed
    ImagePreload --> Failed
    ClusterUpgrade --> Failed
    NodeUpgrade --> Failed
    ImageCleanup --> Failed

    Succeeded --> [*]
    Failed --> [*]

The 8 phases are:

Initialize (Initializing / Initialized): Loads the Version snapshot (when spec.image is not set), records the previous Harvester version, detects single-node clusters, and then runs pre-flight checks (disk space projection against the kubelet image GC threshold and API server certificate expiration). Pre-flight failures are terminal.
ISODownload (ISODownloading / ISODownloaded): Downloads the upgrade ISO via a VirtualMachineImage, or adopts a pre-uploaded image specified in spec.image.
RepoCreate (RepoCreating / RepoCreated): Deploys an Nginx Deployment and Service to serve the ISO contents as an upgrade repository.
MetadataPopulate (MetadataPopulating / MetadataPopulated): Fetches release metadata from the upgrade repository and populates status.releaseMetadata (Harvester, HarvesterChart, OS, Kubernetes, Rancher, MonitoringChart, MinUpgradableVersion).
ImagePreload (ImagePreloading / ImagePreloaded): Before entering ImagePreloading, runs an upgrade eligibility check (skipped when spec.force is true); failure is terminal. Then preloads container images onto all nodes via a system-upgrade-controller Plan. Concurrency is configurable; set to a negative value to skip entirely.
ClusterUpgrade (ClusterUpgrading / ClusterUpgraded): Applies cluster-level upgrade manifests via a Kubernetes Job.
NodeUpgrade (NodeUpgrading / NodeUpgraded): Upgrades individual nodes. Multi-node clusters use Rancher V2 Provisioning drain hooks; single-node clusters use a direct Job-based upgrade.
ImageCleanup (CleaningUp / CleanedUp): Removes stale container images from all nodes via a system-upgrade-controller Plan.

Per-Node State Transitions

During the ImagePreload, NodeUpgrade, and ImageCleanup phases, each node tracks its own state. The node states are grouped into ordinal tiers; a node can only move forward, never backward.

Multi-node cluster:

stateDiagram-v2
    [*] --> ImagePreloading

    state "ImagePreload" as ip {
        ImagePreloading --> ImagePreloaded
        ImagePreloading --> ImagePreloadFailed
    }

    ImagePreloaded --> UpgradePaused : if in pauseNodes
    ImagePreloaded --> PreDraining : otherwise

    state "NodeUpgrade (multi-node)" as nu {
        UpgradePaused --> PreDraining : removed from pauseNodes
        PreDraining --> PreDrained
        PreDraining --> PreDrainFailed
        PreDrained --> PostDraining
        PostDraining --> WaitingReboot
        PostDraining --> PostDrainFailed
        WaitingReboot --> PostDrained
    }

    PostDrained --> ImageCleaning

    state "ImageCleanup" as ic {
        ImageCleaning --> ImageCleaned
        ImageCleaning --> ImageCleanFailed
    }

    ImageCleaned --> [*]

Single-node cluster:

stateDiagram-v2
    [*] --> ImagePreloading

    state "ImagePreload" as ip {
        ImagePreloading --> ImagePreloaded
        ImagePreloading --> ImagePreloadFailed
    }

    ImagePreloaded --> UpgradePaused : if in pauseNodes
    ImagePreloaded --> SingleNodeUpgrading : otherwise

    state "NodeUpgrade (single-node)" as nu {
        UpgradePaused --> SingleNodeUpgrading : removed from pauseNodes
        SingleNodeUpgrading --> SingleNodeUpgraded
        SingleNodeUpgrading --> SingleNodeUpgradeFailed
    }

    SingleNodeUpgraded --> ImageCleaning

    state "ImageCleanup" as ic {
        ImageCleaning --> ImageCleaned
        ImageCleaning --> ImageCleanFailed
    }

    ImageCleaned --> [*]

Key points about node state transitions:

Forward-only: Node states are organized into ordinal groups (0-9). A node's state can only advance to a higher group, never regress.
Pause control: Nodes listed in spec.nodeUpgradeOption.pauseNodes enter UpgradePaused after image preload completes, in both multi-node and single-node clusters. They resume when removed from the list.
Failure states: During NodeUpgrade, the states PreDrainFailed, PostDrainFailed, and SingleNodeUpgradeFailed cause the overall UpgradePlan to transition to Failed. During ImagePreload and ImageCleanup, the overall phase fails when the system-upgrade-controller Plan's job fails, which is detected independently of per-node states.

Developer Guide

After making changes, build and test the upgrade-toolkit binary and container image.

# Lint the code
make lint

# Run unit tests and interation tests
make test

# Build the upgrade-toolkit binary (under `bin/`)
make build

# Build the container image
# The built image will be tagged with `rancher/harvester-upgrade-toolkit:<branch>-head`
make docker-build

To build and push the container image, run:

# Adapt the `REPO` value below to your own Docker Hub repository
REPO=starbops make docker-buildx

Kustomize manifests

Upgrade Toolkit comes with a set of Kustomize manifests that enable easy installation.

To build or update the Kustomize manifests, run:

make manifests

The generatedoutput is located in config/, and can be deployed with the following command:

# Specify the image name and tag in `IMG`
make deploy IMG=starbops/harvester-upgrade-toolkit:dev

Installer manifests

Upgrade Toolkit comes with a single file of installer manifests that enable easy installation.

To build or update the installer manifests, run:

# Specify the image name and tag in `IMG`
make build-installer IMG=starbops/harvester-upgrade-toolkit:dev

The built installer manifests are located in dist/installer.yaml, and can be installed via kubectl apply:

kubectl apply -f dist/installer.yaml

Helm chart

Upgrade Toolkit leverages Kubebuilder's Helm plugin to manage the local Helm chart.

Note

Kubebuilder’s Helm plugin generates Helm charts from the installer manifests. Futhermore, make build-installer depends on the Kustomize manifests generated by make manifests, so it is recommended to run make manifests first, update the Kustomize manifests under config/, and then generate the Helm chart in order to ensure everything is in sync.

# Update the local Helm chart
kubebuilder edit --plugins=helm/v2-alpha

Note

The kubebuilder edit --plugins=helm/v2-alpha command regenerates all template files under dist/chart/templates/. It does not preserve manual edits to templates. After running the plugin, the following manual fixups are required:

Delete dist/chart/templates/cert-manager/ (the project does not use cert-manager)
Delete dist/chart/templates/webhook/mutating-webhook-configuration.yaml and validating-webhook-configuration.yaml (replaced by the consolidated webhook.yaml)
In dist/chart/templates/manager/manager.yaml, replace all occurrences of .Values.certManager.enable with .Values.webhook.enable
In dist/chart/templates/monitoring/servicemonitor.yaml, remove the cert-manager TLS configuration block and use insecureSkipVerify: true only

The dist/chart/templates/webhook/webhook.yaml (which uses genCA()/genSignedCert() for self-signed cert generation) is not affected because the plugin does not delete unrecognized files.

Run the controller manager locally

Every time you make changes to the code, especially in the control loop, you may want to see the changes in action locally from your IDE or terminal.

To do so, make sure you have a Harvester cluster running and can be accessed via kubectl.

Install the UpgradePlan CRD:

# Make sure you have a valid KUBECONFIG env var, pointing to your cluster
make install

Run the controller manager locally (without starting the webhook server):

ENABLE_WEBHOOKS=false make run

Create the Version and UpgradePlan CRs to kickstart the upgrade process.

After the UpgradePlan CR passes the RepoCreated phase, set up a port-forward to allow the local controller manager to access the remote Upgrade Repo.

UP_NAME=$(kubectl get upgradeplans -o json | \
jq -r '.items[]
  | select(any(.status.conditions[]; .type=="Progressing" and .status=="True"))
  | .metadata.name')

# If privileges are not sufficient, run the following command as root with `sudo -E` prepended:
kubectl -n harvester-system port-forward svc/$UP_NAME-repo 80:80

The local controller manager should be able to access the remote Upgrade Repo, advance to the MetadataPopulated phase, and proceed further.

Install the local Helm chart

Make sure you have the container image built and pushed to a registry.

# Specify the image name and tag in `IMG`
make helm-deploy IMG=starbops/harvester-upgrade-toolkit:dev

Create the Version and UpgradePlan CRs to kickstart the upgrade process.

[WIP] Introduce new phases

The phase-based runner design facilitates well-organized phase ordering and allows for the easy integration of new phases.

Let's say we want to introduce a new phase called PreCheck. There will be three places in the codebase that require us to modify:

Update the pkg/upgradeplan/pipeline.go file
Create the new pkg/upgradeplan/phase_precheck.go file

License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.

Name		Name	Last commit message	Last commit date
Latest commit History 203 Commits
.github/workflows		.github/workflows
api/v1beta1		api/v1beta1
cmd		cmd
config		config
dist		dist
hack		hack
internal		internal
package		package
pkg		pkg
test		test
.dockerignore		.dockerignore
.gitignore		.gitignore
.golangci.yml		.golangci.yml
Dockerfile		Dockerfile
LICENSE		LICENSE
Makefile		Makefile
PROJECT		PROJECT
README.md		README.md
go.mod		go.mod
go.sum		go.sum

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Harvester Upgrade Toolkit

User Guide

Installation

Kickstart an upgrade

Customized upgrades

Upgrade-related events

User-facing annotations

Upgrade Workflow

Overall Phase Progression

Per-Node State Transitions

Developer Guide

Kustomize manifests

Installer manifests

Helm chart

Run the controller manager locally

Install the local Helm chart

[WIP] Introduce new phases

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Harvester Upgrade Toolkit

User Guide

Installation

Kickstart an upgrade

Customized upgrades

Upgrade-related events

User-facing annotations

Upgrade Workflow

Overall Phase Progression

Per-Node State Transitions

Developer Guide

Kustomize manifests

Installer manifests

Helm chart

Run the controller manager locally

Install the local Helm chart

[WIP] Introduce new phases

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