Configuration Validation Webhook

Galley’s configuration validation ensures user authored Istio configuration is syntactically and semantically valid. It uses a Kubernetes ValidatingWebhook. The istio-galley ValidatingWebhookConfiguration has two webhooks.

  • pilot.validation.istio.io - Served on path /admitpilot and is responsible for validating configuration consumed by Pilot (e.g. VirtualService, Authentication).

  • mixer.validation.istio.io - Served on path /admitmixer and is responsible for validating configuration consumed by Mixer.

Both webhooks are implemented by the istio-galley service on port 443. Each webhook has its own clientConfig, namespaceSelector, and rules section. Both webhooks are scoped to all namespaces. The namespaceSelector should be empty. Both rules apply to Istio Custom Resource Definitions (CRDs).

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