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Installing Istio for Knative
This guide walks you through manually installing and customizing Istio for use with Knative.
If your cloud platform offers a managed Istio installation, we recommend installing Istio that way, unless you need the ability to customize your installation. If your cloud platform offers a managed Istio installation, the install guide for your specific platform will have those instructions.
Before you begin
- A Kubernetes cluster created.
istioctl(v1.5.4 or later) installed.
When you install Istio, there are a few options depending on your goals. For a basic Istio installation suitable for most Knative use cases, follow the Installing Istio without sidecar injection instructions. If you're familiar with Istio and know what kind of installation you want, read through the options and choose the installation that suits your needs.
You can easily customize your Istio installation with
istioctl. The below sections
cover a few useful Istio configurations and their benefits.
Choosing an Istio installation
You can install Istio with or without a service mesh:
Installing Istio without sidecar injection(Recommended default installation)
If you want to get up and running with Knative quickly, we recommend installing Istio without automatic sidecar injection. This install is also recommended for users who don't need the Istio service mesh, or who want to enable the service mesh by manually injecting the Istio sidecars.
Enter the following command to install Istio:
cat << EOF > ./istio-minimal-operator.yaml apiVersion: install.istio.io/v1alpha1 kind: IstioOperator spec: values: global: proxy: autoInject: disabled useMCP: false # The third-party-jwt is not enabled on all k8s. # See: https://istio.io/docs/ops/best-practices/security/#configure-third-party-service-account-tokens jwtPolicy: first-party-jwt addonComponents: pilot: enabled: true prometheus: enabled: false components: ingressGateways: - name: istio-ingressgateway enabled: true - name: cluster-local-gateway enabled: true label: istio: cluster-local-gateway app: cluster-local-gateway k8s: service: type: ClusterIP ports: - port: 15020 name: status-port - port: 80 name: http2 - port: 443 name: https EOF istioctl manifest apply -f istio-minimal-operator.yaml
Installing Istio with sidecar injection
If you want to enable the Istio service mesh, you must enable automatic sidecar injection. The Istio service mesh provides a few benefits:
Allows you to turn on mutual TLS, which secures service-to-service traffic within the cluster.
Allows you to use the Istio authorization policy, controlling the access to each Knative service based on Istio service roles.
To automatic sidecar injection, set
autoInject: enabled in addition to above
global: proxy: autoInject: enabled
Using Istio mTLS feature
Since there are some networking communications between knative-serving namespace and the namespace where your services running on, you need additional preparations for mTLS enabled environment.
- Enable sidecar container on
kubectl label namespace knative-serving istio-injection=enabled
PERMISSIVEon knative-serving system namespace.
cat <<EOF | kubectl apply -f - apiVersion: "security.istio.io/v1beta1" kind: "PeerAuthentication" metadata: name: "default" namespace: "knative-serving" spec: mtls: mode: PERMISSIVE EOF
For the official Istio installation guide, see the Istio Kubernetes Getting Started Guide.
For the full list of available configs when installing Istio with
istioctl, see the Istio Installation Options reference.
Clean up Istio
See the Uninstall Istio.
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