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    Granting TKE Cluster Permissions to API Gateway

    Last updated: 2023-03-31 10:34:01
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      Scenario

      This document describes how to authorize API Gateway to access the API server of a TKE cluster, offers solutions to authorization issues, and lists the permissions obtained by API Gateway in an YAML file.

      Prerequisites

      1. You have logged in to the API Gateway console.
      2. You have a TKE cluster and have obtained its admin role.

      Directions

      In the TKE tunnel configuration of API Gateway, if you reference a TKE cluster for the first time, you need to grant API Gateway the access to the cluster's API server and ensure that the cluster has private network access enabled.
      When the TKE tunnel is configured, the API Gateway system will automatically check whether the cluster has been authorized, and if not, it will prompt you for authorization. If the cluster access has already been granted to API Gateway, the system will display Authorized API Gateway. Each cluster only needs to be authorized for API Gateway once and doesn't require repeated authorizations for subsequent operations.

      How It Works

      The process for API Gateway to get the authorization is as follows:
      1. Under the kube-system namespace, create a ServiceAccount named apigw-ingress and a ClusterRole named apigw-ingress-clusterrole.
      2. Bind apigw-ingress and apigw-ingress-clusterrole through ClusterRoleBinding. Then, the permission of the apigw-ingress ServiceAccount is obtained by API Gateway to access the API server of the cluster.
      The permission of the apigw-ingress ServiceAccount is stored in the Secret prefixed with apigw-ingress-token-.
      For more information on the permissions obtained by API Gateway and the specific method, see the YAML used to create resources:
      apiVersion: rbac.authorization.k8s.io/v1
      kind: ClusterRole
      metadata:
        name: apigw-ingress-clusterrole
      rules:
        - apiGroups:
            - ""
          resources:
            - services
            - namespaces
            - endpoints
            - nodes
            - pods
          verbs:
            - get
            - list
            - watch
        - apiGroups:
            - apps
          resources:
            - deployments
            - replicasets
          verbs:
            - get
            - list
            - watch
        - apiGroups:
            - ""
          resources:
            - configmaps
            - secrets
          verbs:
            - "*"
        - apiGroups:
            - extensions
          resources:
            - ingresses
            - ingresses/status
          verbs:
            - "*"
        - apiGroups:
            - ""
          resources:
            - events
          verbs:
            - create
            - patch
            - list
            - update
        - apiGroups:
            - apiextensions.k8s.io
          resources:
            - customresourcedefinitions
          verbs:
            - "*"
        - apiGroups:
            - cloud.tencent.com
          resources:
            - tkeserviceconfigs
          verbs:
            - "*"
      ---
      apiVersion: v1
      kind: ServiceAccount
      metadata:
        namespace: kube-system
        name: apigw-ingress
      ---
      apiVersion: rbac.authorization.k8s.io/v1
      kind: ClusterRoleBinding
      metadata:
        name: apigw-ingress-clusterrole-binding
      roleRef:
        apiGroup: rbac.authorization.k8s.io
        kind: ClusterRole
        name: apigw-ingress-clusterrole
      subjects:
        - kind: ServiceAccount
          name: apigw-ingress
          namespace: kube-system

      Reminders

      After you successfully grant API Gateway the access to the TKE cluster, you cannot modify the resources reserved by API Gateway, including:
      The ServiceAccount named apigw-ingress under the kube-system namespace.
      The ClusterRole named apigw-ingress-clusterrole under the kube-system namespace.
      The ClusterRoleBinding named apigw-ingress-clusterrole-binding under the kube-system namespace.
      The Secret prefixed with apigw-ingress-token- in the kube-system namespace.

      FAQs

      Problem: During authorization, it is found that the private network access feature is not enabled for the TKE cluster.
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