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fleet-docs/docs/install-usage-fleetCLI.md

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Install and Use Fleet CLI

Fleet CLI is a command-line interface(CLI) that allows you to interact directly with Fleet from your local machine. It enables you to create, apply and inspect bundles without requiring a GitRepo. Typical use cases include:

  • Testing and previewing bundle contents.
  • Creating bundles directly from Helm charts, Kubernetes manifests and fleet.yaml files.
  • Checking which clusters a bundle would target
  • Validating deployments without installing Fleet in the cluster

:::note You can use fleet apply without installing Fleet in your clusters. However, for cluster interaction (for example, fleet target, fleet deploy), Fleet must be installed. For more information, refer to Install Fleet. :::

Install Fleet CLI

Fleet CLI is a stand-alone binary you can download from the Fleet GitHub releases page.

Linux/macOS

curl -L -o fleet https://github.com/rancher/fleet/releases/download/v0.12.4/fleet-linux-amd64

# Make it executable and move to PATH

chmod +x fleet

sudo mv fleet /usr/local/bin/

Windows (PowerShell)

Invoke-WebRequest -Uri "https://github.com/rancher/fleet/releases/download/v0.12.4/fleet-windows-amd64.exe" -OutFile "fleet.exe"

Verify installation

fleet --version

Prerequisites

Make sure you have the following tools installed and configured:

  • A working Kubernetes cluster (e.g., via k3s, kind, or a cloud provider).
  • kubectl is configured for your cluster.
  • helm is installed.
  • Fleet CLI is installed and accessible in your terminal.

Verify prerequisites

kubectl get nodes  
helm version  
fleet --version

Key commands

Fleet provides several CLI commands to create, preview, and deploy bundles. These commands are useful for debugging and understanding the bundle lifecycle.

  • fleet target: Reads a bundle file and evaluates which clusters would receive it, based on selectors and targeting rules such as targets, targetOverrides, clusterGroups, and label selectors.
    • For example, fleet target my-bundle ./manifests.
  • fleet apply: creates or previews a bundle from local files, such as a Helm chart, Kubernetes manifests, or kustomize folders. This command works even without Fleet installed.
    • This applies for fleet.yaml, Helm charts and manifests. For example, fleet apply my-bundle ./manifests.
  • fleet deploy: deploys a bundle with or without pushing it to the cluster. You can use it with the output of fleet target or a dumped bundledeployment/content resource. You can use it for:
    • fleet apply -o - name ./folder to check the YAML of the bundle before creating it. For more information, refer to as in Convert a Helm chart into a bundle.
    • Target to debug selectors and verify which downstream clusters are targeted.
    • fleet deploy --dry-run to validate workload resources.

A diagram explaining how fleet CLI key commands work.

For more information, refer to Bundle Lifecycle With the CLI.

Deploy a Sample Bundle Using Fleet CLI

You can deploy workloads without using GitRepos by applying them locally with the CLI. For example, consider using the Fleet examples repository.

git clone https://github.com/rancher/fleet-examples  
cd fleet-examples/single-cluster

Apply it to the current cluster:

fleet apply -o my-cool-bundle manifests

This creates a Bundle resource in the namespace.

Convert a Helm Chart into a Bundle

You can use the Fleet CLI to convert a Helm chart into a bundle.

For example, you can download and convert the "external secrets" operator chart like this:

cat > targets.yaml <<EOF
targets:
- clusterSelector: {}
EOF

mkdir app
cat > app/fleet.yaml <<EOF
defaultNamespace: external-secrets
helm:
  repo: https://charts.external-secrets.io
  chart: external-secrets
EOF

fleet apply --compress --targets-file=targets.yaml -n fleet-default -o - external-secrets app > eso-bundle.yaml

kubectl apply -f eso-bundle.yaml

Make sure you use a cluster selector in targets.yaml, that matches all clusters you want to deploy to.

The blog post on Fleet: Multi-Cluster Deployment with the Help of External Secrets has more information.

Troubleshooting

If the bundle is not ready:

  • Check if fleet-controller and fleet-agent pods are running.
  • Make sure the fleet-local cluster is registered:
  • Inspect the bundle for error messages:
    • kubectl describe bundle -n fleet-local nginx-bundle
  • Delete and re-apply the bundle if you encounter Helm ownership conflicts.