How Kubernetes Admission Webhooks Cause Deployment Failures

Episode notes

Episode 69 of DevOps Daily with Fexingo: Lucas and Luna break down why Kubernetes admission webhooks can silently block deployments and cause production rollbacks. They walk through a real-world case where a mutating webhook injected a sidecar that broke pod startup, and a validating webhook rejected a critical ConfigMap update due to a missing label. You'll learn how MutatingAdmissionWebhook and ValidatingAdmissionWebhook configurations, failure policies, and ordering can turn a harmless change into a 20-minute outage. Lucas explains why setting failurePolicy: Ignore on non-critical webhooks can prevent cascading failures, and Luna shares a story from her team where a webhook timeout took down an entire staging cluster. By the end, you'll know how to audit your webhook chain using kubectl and a simple checklist to avoid silent deployment failures. #Kubernetes #AdmissionWebhooks #MutatingAdmissionWebhook #ValidatingAdmissionWebhook #DevOps #CI/CD #DeploymentFailure #K8sSecurity #CloudNative #DevOpsDaily #FexingoBusiness #BusinessPodcast #Technology #SoftwareOperations #K8sTroubleshooting #PodLifecycle #ClusterOps #SiteReliability Keep every episode free: buymeacoffee.com/fexingo