Identity and Access Management (IAM) controls who gets in, what they can see, and how they use it. In Kubernetes, Ingress resources decide how external traffic reaches internal services. The intersection of IAM and Ingress defines a security perimeter that is both flexible and fragile. One misconfigured rule can expose an entire cluster.
An IAM ingress strategy starts with mapping identities—human users, service accounts, and federated roles. Every identity must be tied to explicit permissions, defined in Policies or RoleBindings that match only what’s necessary. Over-permission is risk; under-permission is friction. Good ingress starts at the load balancer but is enforced all the way down to pod-level service accounts.
Secure Ingress resources do not rely on default settings. Configure TLS termination explicitly. Lock down allowed hosts and paths. Use annotations to integrate with identity providers, or to require authentication via OIDC or SAML before traffic reaches workloads. Without IAM enforcement at ingress, you can only hope external requests are safe—they are not.