kubernetes traefik multiple namespaces

官方文档在此 https://docs.traefik.io/user-guide/kubernetes/

官方文档在配置 RBAC 时使用了 ClusterRoleBinding, 当你想用多命名空间时,官方给了你一个提示

For namespaced restrictions, one RoleBinding is required per watched namespace along with a corresponding configuration of Træfik's kubernetes.namespaces parameter.

这就是坑人的地方了 !!!

traefik --help 这么显示的

默认值是一个"[]", 这到底是一个字符串还是列表

那么我是--kubernetes.namespaces="[env-a, env-b]" 还是 --kubernetes.namespaces=["env-a", "env-b"]

我们把帮助文档往上拉

好有个说明,那么我们就认为是这么填 --kubernetes.namespaces='env-a,env-b'

还是报错

经过万能的 google 搜索,发现了这个页面 https://github.com/containous/traefik/issues/1153

看一下-- help 就知道这里这个参数是个 map, 那么变通一下 --kubernetes.namespaces=env-a,env-b 没有引号, 官方文档真的能坑死人

让我们来看一下完整的配置

RBAC 我们使用 Role 和 RoleBinding

这样就能在不同的 namespace 启动不同的 traefik 实例来指向不同的 ingress

---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: traefik-ingress-controller
  namespace: default
rules:
  - apiGroups:
      - ""
    resources:
      - services
      - endpoints
      - secrets
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - extensions
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: traefik-ingress-controller
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: traefik-ingress-controller
subjects:
- kind: ServiceAccount
  name: traefik-ingress-controller
  namespace: default

deployment

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: traefik-ingress-controller
  namespace: default
---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: traefik-ingress-controller
  namespace: default
  labels:
    k8s-app: traefik-ingress-lb
spec:
  replicas: 1
  selector:
    matchLabels:
      k8s-app: traefik-ingress-lb
  template:
    metadata:
      labels:
        k8s-app: traefik-ingress-lb
        name: traefik-ingress-lb
    spec:
      serviceAccountName: traefik-ingress-controller
      terminationGracePeriodSeconds: 60
      containers:
      - image: traefik
        name: traefik-ingress-lb
        args:
        - --api
        - --kubernetes
        - --kubernetes.namespaces=default           #### 就是这里
        - --logLevel=INFO
---
kind: Service
apiVersion: v1
metadata:
  name: traefik-ingress-service
  namespace: default
spec:
  selector:
    k8s-app: traefik-ingress-lb
  ports:
    - protocol: TCP
      port: 80
      name: web
    - protocol: TCP
      port: 8080
      name: admin
  type: NodePort

---
apiVersion: v1
kind: Service
metadata:
  name: traefik-web-ui
  namespace: default
spec:
  selector:
    k8s-app: traefik-ingress-lb
  ports:
  - name: web
    port: 80
    targetPort: 8080
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: traefik-web-ui
  namespace: default
spec:
  rules:
  - host: traefik-ui.minikube
    http:
      paths:
      - path: /
        backend:
          serviceName: traefik-web-ui
          servicePort: web