Installing with Helm

Prerequisites

For this guide in particular, you will need:

• kubectl - the Kubernetes CLI
• Helm - the package manager for Kubernetes

Install Spin Operator With Helm

The following instructions are for installing Spin Operator using a Helm chart (using helm install).

Prepare the Cluster

Before installing the chart, you’ll need to ensure the following are installed:

• cert-manager to automatically provision and manage TLS certificates (used by spin-operator’s admission webhook system). For detailed installation instructions see the cert-manager documentation.

kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.5/cert-manager.yaml

• Kwasm Operator is required to install WebAssembly shims on Kubernetes nodes that don’t already include them. Note that in the future this will be replaced by runtime class manager.

# Add Helm repository if not already done
helm repo add kwasm http://kwasm.sh/kwasm-operator/

# Install KWasm operator
helm install \
  kwasm-operator kwasm/kwasm-operator \
  --namespace kwasm \
  --create-namespace \
  --set kwasmOperator.installerImage=ghcr.io/spinkube/containerd-shim-spin/node-installer:v0.18.0

# Provision Nodes
kubectl annotate node --all kwasm.sh/kwasm-node=true

Chart prerequisites

Now we have our dependencies installed, we can start installing the operator. This involves a couple of steps that allow for further customization of Spin Applications in the cluster over time, but here we install the defaults.

• First ensure the Custom Resource Definitions (CRD) are installed. This includes the SpinApp CRD representing Spin applications to be scheduled on the cluster.

kubectl apply -f https://github.com/spinkube/spin-operator/releases/download/v0.4.0/spin-operator.crds.yaml

• Next we create a RuntimeClass that points to the spin handler called wasmtime-spin-v2. If you are deploying to a production cluster that only has a shim on a subset of nodes, you’ll need to modify the RuntimeClass with a nodeSelector::

kubectl apply -f https://github.com/spinkube/spin-operator/releases/download/v0.4.0/spin-operator.runtime-class.yaml

• Finally, we create a containerd-spin-shim SpinAppExecutor. This tells the Spin Operator to use the RuntimeClass we just created to run Spin Apps:

kubectl apply -f https://github.com/spinkube/spin-operator/releases/download/v0.4.0/spin-operator.shim-executor.yaml

Installing the Spin Operator Chart

The following installs the chart with the release name spin-operator:

# Install Spin Operator with Helm
helm install spin-operator \
  --namespace spin-operator \
  --create-namespace \
  --version 0.4.0 \
  --wait \
  oci://ghcr.io/spinkube/charts/spin-operator

Upgrading the Chart

Note that you may also need to upgrade the spin-operator CRDs in tandem with upgrading the Helm release:

kubectl apply -f https://github.com/spinkube/spin-operator/releases/download/v0.4.0/spin-operator.crds.yaml

To upgrade the spin-operator release, run the following:

# Upgrade Spin Operator using Helm
helm upgrade spin-operator \
  --namespace spin-operator \
  --version 0.4.0 \
  --wait \
  oci://ghcr.io/spinkube/charts/spin-operator

Uninstalling the Chart

To delete the spin-operator release, run:

# Uninstall Spin Operator using Helm
helm delete spin-operator --namespace spin-operator

This will remove all Kubernetes resources associated with the chart and deletes the Helm release.

To completely uninstall all resources related to spin-operator, you may want to delete the corresponding CRD resources and the RuntimeClass:

kubectl delete -f https://github.com/spinkube/spin-operator/releases/download/v0.4.0/spin-operator.shim-executor.yaml
kubectl delete -f https://github.com/spinkube/spin-operator/releases/download/v0.4.0/spin-operator.runtime-class.yaml
kubectl delete -f https://github.com/spinkube/spin-operator/releases/download/v0.4.0/spin-operator.crds.yaml