[运维]7.ingress controller的API组迁移带来的权限问题

部署ingress controller pod后发现错误。这里是说没法列出networking.k8s.io 里的资源，也无法在discovery.k8s.io里的endpoints资源。

Failed to watch *v1.EndpointSlice: failed to list *v1.EndpointSlice: endpointslices.discovery.k8s.io is forbidden: User "system:serviceaccount:kube-system:nginx-ingress-serviceaccount" cannot list resource "endpointslices" in API group "discovery.k8s.io" at the cluster scope
ingressclasses.networking.k8s.io is forbidden: User "system:serviceaccount:kube-system:nginx-ingress-serviceaccount" cannot list resource "ingressclasses" in API group "networking.k8s.io" at the cluster scope

原有的rbac设置，可以看到这里ClusterRole设置了apiGroups为extension。但是最新的ingress controller已经从extension的api资源组移动到了networking.k8s.io 的API资源组，所以这里的权限已经不再适用。

apiVersion: v1
kind: ServiceAccount    
metadata:
  name: nginx-ingress-serviceaccount #创建一个serveerAcount
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: nginx-ingress-clusterrole   #这个ServiceAcount所绑定的集群角色
rules:
  - apiGroups:
      - "" 
    resources:    #此集群角色的权限，它能操作的API资源 
      - configmaps
      - endpoints
      - nodes
      - pods
      - secrets
    verbs:
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - nodes
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - services
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - "extensions"
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - ""
    resources:
        - events
    verbs:
        - create
        - patch
  - apiGroups:
      - "extensions"
    resources:
      - ingresses/status
    verbs:
      - update

 修改后的ClusterRole

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: nginx-ingress-clusterrole
rules:
  - apiGroups:
      - "" 
    resources:    
      - configmaps
      - endpoints
      - nodes
      - pods
      - secrets
    verbs:
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - nodes
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - services
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - "networking.k8s.io"  # 添加对 networking.k8s.io API 组的权限
    resources:
      - ingresses
      - ingressclasses   # 添加对 IngressClass 的权限
      - ingresses/status
    verbs:
      - get
      - list
      - watch
      - update           # 对 ingresses/status 的权限
  - apiGroups:
      - "discovery.k8s.io"  # 添加对 EndpointSlice 的权限
    resources:
      - endpointslices
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - ""
    resources:
        - events
    verbs:
        - create
        - patch
  - apiGroups:
      - "extensions"
    resources:
      - ingresses/status
    verbs:
      - update

其他配置文件:

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:         
  name: nginx-ingress-role  #这是一个角色，而非集群角色 
  namespace: kube-system
rules:  #角色的权限 
  - apiGroups:
      - ""
    resources:
      - configmaps
      - pods
      - secrets
      - namespaces
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - configmaps
    resourceNames:
      # Defaults to "<election-id>-<ingress-class>"
      # Here: "<ingress-controller-leader>-<nginx>"
      # This has to be adapted if you change either parameter
      # when launching the nginx-ingress-controller.
      - "ingress-controller-leader-nginx"
    verbs:
      - get
      - update
  - apiGroups:
      - ""
    resources:
      - configmaps
    verbs:
      - create
  - apiGroups:
      - ""
    resources:
      - endpoints
    verbs:
      - get
      - create
      - update

随后进行角色权限绑定： 

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding       #角色绑定
metadata:
  name: nginx-ingress-role-nisa-binding
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: nginx-ingress-role
subjects:
  - kind: ServiceAccount
    name: nginx-ingress-serviceaccount #绑定在这个用户 
    namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding      #集群绑定
metadata:
  name: nginx-ingress-clusterrole-nisa-binding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: nginx-ingress-clusterrole
subjects:
  - kind: ServiceAccount
    name: nginx-ingress-serviceaccount   #集群绑定到这个serviceacount
    namespace: kube-system   #集群角色是可以跨namespace，但是这里只指明给这个namespce来使用

 

原文地址：https://blog.csdn.net/weixin_45396500/article/details/142748348

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