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How to Configure Vault OIDC Auth for Users and Kubernetes Auth for Workloads

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HashiCorp Vault supports two distinct authentication methods tailored to different principals: OIDC for human engineers and Kubernetes service account tokens for automated workloads. With OIDC, Vault delegates identity verification to a trusted provider such as Okta, Entra ID, or Keycloak, meaning Vault never handles passwords directly and short-lived tokens force re-authentication through SSO. Administrators configure roles that map identity provider claims — including group membership — to Vault policies, so access rights stay in sync with upstream directory changes without manual Vault updates. External identity groups with group aliases allow IdP group membership to automatically drive Vault authorization, eliminating stale grants when users change teams. For machine workloads, Kubernetes auth uses the pod's native service account token as its sole credential, keeping the two authentication paths clearly separated by design.

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