SAML で GKE Identity Service のクラスタを設定する

kubectl --kubeconfig=KUBECONFIG_PATH edit ClientConfigs default -n kube-public

apiVersion: authentication.gke.io/v2alpha1
kind: ClientConfig
metadata:
  name: default
  namespace: kube-public
spec:
  authentication:
  - name: NAME
   saml:
     idpEntityID: ENTITY_ID
     idpSingleSignOnURI: SIGN_ON_URI
     idpCertificateDataList: IDP_CA_CERT
     userAttribute: USER_ATTRIBUTE
     groupsAttribute: {'<var name="user attribute">GROUPS_ATTRIBUTE</var>'}}
     userPrefix: USER_PREFIX
     groupPrefix: GROUP_PREFIX
     attributeMapping:
       ATTRIBUTE_KEY_1 : ATTRIBUTE_CEL_EXPRESSION_1
       ATTRIBUTE_KEY_2 : ATTRIBUTE_CEL_EXPRESSION_2
  certificateAuthorityData: CERTIFICATE_STRING
  preferredAuthentication: PREFERRED_AUTHENTICATION
  server: <>

# Rest of the resource is managed by Google. DO NOT MODIFY.
...

apiVersion: v1
items:
- apiVersion: authentication.gke.io/v2alpha1
  kind: ClientConfig
...
  spec:
    authentication:
    - aws:
        region: us-west-2
      name: AWS Login
    - ldap:
    ...
    - saml:
      ...
    - azureAD:
      ...
    - oidc:
      name: Okta OIDC
      ...
    -oidc:
      name: Google OIDC
      ...