io.k8s.api.certificates.v1.PodCertificateRequestSpec

maxExpirationSeconds is the maximum lifetime permitted for the certificate. If omitted, kube-apiserver will set it to 86400(24 hours). kube-apiserver will reject values shorter than 3600 (1 hour). The maximum allowable value is 7862400 (91 days). The signer implementation is then free to issue a certificate with any lifetime *shorter* than MaxExpirationSeconds, but no shorter than 3600 seconds (1 hour). This constraint is enforced by kube-apiserver. `kubernetes.io` signers will never issue certificates …

signerName indicates the requested signer. All signer names beginning with `kubernetes.io` are reserved for use by the Kubernetes project. There is currently one well-known signer documented by the Kubernetes project, `kubernetes.io/kube-apiserver-client-pod`, which will issue client certificates understood by kube-apiserver. It is currently unimplemented.

A PKCS#10 certificate signing request (DER-serialized) generated by Kubelet using the subject private key. Most signer implementations will ignore the contents of the CSR except to extract the subject public key. The API server automatically verifies the CSR signature during admission, so the signer does not need to repeat the verification. CSRs generated by kubelet are completely empty. The subject public key must be one of RSA3072, RSA4096, ECDSAP256, ECDSAP384, ECDSAP521, or ED25519. Note that this li…

unverifiedUserAnnotations allow pod authors to pass additional information to the signer implementation. Kubernetes does not restrict or validate this metadata in any way. Entries are subject to the same validation as object metadata annotations, with the addition that all keys must be domain-prefixed. No restrictions are placed on values, except an overall size limitation on the entire field. Signers should document the keys and values they support. Signers should deny requests that contain keys they d…