使用kubeoperator安装k8s集群时自带的traefikingresscontroller

前提

承接上一篇文章：https://www.cnblogs.com/sanduzxcvbnm/p/15740596.html

traefik-ingress-controller和nginx-ingress-controller不能共存，因为都要占用主机的80和443端口，因此需要先卸载nginx-ingress-controller:kubectl delete -f nginx-ingress-controller.yaml

安装

使用设计到俩文件，分别是crds.yaml和traefik-ingress-controller.yaml

# cat crds.yaml

# ref: https://docs.traefik.io/providers/kubernetes-crd/

# All resources definition must be declared
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: ingressroutes.traefik.containo.us

spec:
  group: traefik.containo.us
  version: v1alpha1
  names:
    kind: IngressRoute
    plural: ingressroutes
    singular: ingressroute
  scope: Namespaced

---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: middlewares.traefik.containo.us

spec:
  group: traefik.containo.us
  version: v1alpha1
  names:
    kind: Middleware
    plural: middlewares
    singular: middleware
  scope: Namespaced

---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: ingressroutetcps.traefik.containo.us

spec:
  group: traefik.containo.us
  version: v1alpha1
  names:
    kind: IngressRouteTCP
    plural: ingressroutetcps
    singular: ingressroutetcp
  scope: Namespaced

---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: ingressrouteudps.traefik.containo.us

spec:
  group: traefik.containo.us
  version: v1alpha1
  names:
    kind: IngressRouteUDP
    plural: ingressrouteudps
    singular: ingressrouteudp
  scope: Namespaced

---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: tlsoptions.traefik.containo.us

spec:
  group: traefik.containo.us
  version: v1alpha1
  names:
    kind: TLSOption
    plural: tlsoptions
    singular: tlsoption
  scope: Namespaced

---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: tlsstores.traefik.containo.us

spec:
  group: traefik.containo.us
  version: v1alpha1
  names:
    kind: TLSStore
    plural: tlsstores
    singular: tlsstore
  scope: Namespaced

---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: traefikservices.traefik.containo.us

spec:
  group: traefik.containo.us
  version: v1alpha1
  names:
    kind: TraefikService
    plural: traefikservices
    singular: traefikservice
  scope: Namespaced

---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: serverstransports.traefik.containo.us

spec:
  group: traefik.containo.us
  version: v1alpha1
  names:
    kind: ServersTransport
    plural: serverstransports
    singular: serverstransport
  scope: Namespaced

# cat traefik-ingress-controller.yaml

kind: ServiceAccount
apiVersion: v1
metadata:
  namespace: kube-system
  name: traefik
  labels:
    app.kubernetes.io/name: traefik
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: traefik
  labels:
    app.kubernetes.io/name: traefik
rules:
  - apiGroups:
      - ""
    resources:
      - services
      - endpoints
      - secrets
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - extensions
      - networking.k8s.io
    resources:
      - ingresses
      - ingressclasses
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - extensions
      - networking.k8s.io
    resources:
      - ingresses/status
    verbs:
      - update
  - apiGroups:
      - traefik.containo.us
    resources:
      - ingressroutes
      - ingressroutetcps
      - ingressrouteudps
      - middlewares
      - tlsoptions
      - tlsstores
      - traefikservices
      - serverstransports
    verbs:
      - get
      - list
      - watch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: traefik
  labels:
    app.kubernetes.io/name: traefik
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: traefik
subjects:
  - kind: ServiceAccount
    name: traefik
    namespace: kube-system
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  namespace: kube-system
  name: traefik
  labels:
    app.kubernetes.io/name: traefik
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: traefik
  template:
    metadata:
      labels:
        app.kubernetes.io/name: traefik
    spec:
      serviceAccountName: traefik
      terminationGracePeriodSeconds: 60
      hostNetwork: true
      dnsPolicy: ClusterFirstWithHostNet
      nodeSelector:
        kubernetes.io/os: linux
        node-role.kubernetes.io/worker: ""
      containers:
      - image: registry.kubeoperator.io:8082/traefik:v2.4.8
        imagePullPolicy: IfNotPresent
        name: traefik
        resources:
        readinessProbe:
          httpGet:
            path: /ping
            port: 18443
          failureThreshold: 1
          initialDelaySeconds: 10
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 2
        livenessProbe:
          httpGet:
            path: /ping
            port: 18443
          failureThreshold: 3
          initialDelaySeconds: 10
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 2
        ports:
        - name: "traefik"
          containerPort: 18443
          protocol: "TCP"
        - name: "web"
          containerPort: 80
          protocol: "TCP"
        - name: "websecure"
          containerPort: 443
          protocol: "TCP"
        securityContext:
          capabilities:
            drop:
            - ALL
            add:
            - NET_BIND_SERVICE
        volumeMounts:
          - name: data
            mountPath: /data
          - name: tmp
            mountPath: /tmp
        args:
          - "--global.checknewversion"
          - "--global.sendanonymoususage"
          - "--entryPoints.traefik.address=:18443/tcp"
          - "--entryPoints.web.address=:80/tcp"
          - "--entryPoints.websecure.address=:443/tcp"
          - "--api.insecure=true"
          - "--api.dashboard=true"
          - "--ping=true"
          - "--providers.kubernetescrd"
          - "--providers.kubernetesingress"
      volumes:
        - name: data
          emptyDir: {}
        - name: tmp
          emptyDir: {}

---
apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  namespace: kube-system
  name: traefik-dashboard
  labels:
    app.kubernetes.io/name: traefik
spec:
  entryPoints:
    - traefik
  routes:
  - match: PathPrefix(`/dashboard`) || PathPrefix(`/api`)
    kind: Rule
    services:
    - name: api@internal
      kind: TraefikService

访问dashboard

通过查看traefik-ingress-controller.yaml文件内容，可以知道使用的端口号是18443

使用k8s集群中任一主机ip加上18443端口即可访问traefik对应的dashboard

不带端口号访问dashboard

通过查看traefik-ingress-controller.yaml文件，可以知道提供的除了traefik(18443)外，还有web(80)和websecure(443)。

另外当前通过18443端口访问dashboard是依据名为traefik-dashboard的IngressRoute，这里修改其中的entryPoints，把traefik修改为web，然后访问，会报错404。

参考这篇文章：https://www.cnblogs.com/sanduzxcvbnm/p/14986597.html ，使用的是配置文件

但是在这里使用的是命令行参数形式

因此还需要在annotations 要里加上kubernetes.io/ingress.class: traefik，最终文件内容如下(部分内容)：

apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  namespace: kube-system
  name: traefik-dashboard
  labels:
    app.kubernetes.io/name: traefik
    kubernetes.io/ingress.class: traefik # 新增
spec:
  entryPoints:
    - web # 把traefik修改成web
  routes:
  - match: Host(`www.daniel.com`) && PathPrefix(`/dashboard`) || PathPrefix(`/api`) # 新加上Host(`www.daniel.com`) &&
    kind: Rule
    services:
    - name: api@internal
      kind: TraefikService

在自己主机hosts文件中手动添加一条解析

此时使用网址http://www.daniel.com/dashboard/访问就会出现dashboard界面了 （最后的/一定要带，否则访问404）。

本身存在的18443对应的有关内容不能去掉，否则会造成traefik服务启动不起来

另外，注意到最后的内容：

    - name: api@internal
      kind: TraefikService

对应的是api接口,而不是dashboard的dashboard@internal。

这是因为默认使用了中间件，从而实现一条match匹配多个。
如果后面跟的是dashboard，那么访问的是dashboard的内容，中间件这儿会自动进行跳转，如果后面跟的是api,则默认使用的就是api的api@internal。

访问对应的接口数据：http://www.daniel.com/api/rawdata

官方文档描述如下

当 Traefik 检测到新服务时，它会创建相应的路由，然后我们可以访问相应的路由
查看 http://localhost:18443/api/rawdata 接口的数据，正常就可以看到 Traefik 已自动检测到新容器并更新了相应的配置。

配置ingress规则

卸载nginx-ingress-controller后，直接安装traefik-ingress-controller.yaml，原先的规则还能继续使用，但是不显示具体的IngressClass了

dashboard使用的这条IngressRoute要在自定义资源中查看