How do I check if my cluster has enabled the alpha features required for automatic sidecar injection?
Automatic sidecar injection requires the initilizer alpha feature. Run the following command to check if the initializer has been enabled (empty output indicates that initializers are not enabled):
kubectl api-versions | grep admissionregistration
In addition, the Kubernetes API server must be started with the Initializer plugin enabled. Failure to enable the Initializer plugin will result in the following error when trying to create the initializer deployment.
The Deployment “istio-initializer” is invalid: metadata.initializers.pending: Invalid value: “null”: must be non-empty when result is not set
Automatic sidecar injection is not working. How can I debug this?
Ensure that your cluster has met the prerequisites for the automatic sidecar injection. If your microservice is deployed in kube-system, kube-public or istio-system namespaces, they are exempted from automatic sidecar injection. Please use a different namespace instead.
Can I migrate an existing installation from Istio v0.1.x to v0.2.x?
Upgrading from Istio 0.1.x to 0.2.x is not supported. You must uninstall Istio v0.1, including pods with Istio sidecars and start with a fresh install of Istio v0.2.