十、K8S初上手：部署Ingress和Traefik

Traefik

基于Ingress的控制器、负载均衡服务

文档： docs.traefik.io/providers/k…

​ docs.traefik.io/user-guides…

建立 traefik.res.yml

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
 
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: traefik-ingress-controller
 
rules:
  - apiGroups:
      - ""
    resources:
      - services
      - endpoints
      - secrets
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - extensions
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - extensions
    resources:
      - ingresses/status
    verbs:
      - update
  - apiGroups:
      - traefik.containo.us
    resources:
      - middlewares
      - ingressroutes
      - traefikservices
      - ingressroutetcps
      - ingressrouteudps
      - tlsoptions
      - tlsstores
    verbs:
      - get
      - list
      - watch
 
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: traefik-ingress-controller
 
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: traefik-ingress-controller
subjects:
  - kind: ServiceAccount
    name: traefik-ingress-controller
    namespace: default

应用 traefik 资源配置

$ kubectl apply -f traefik.res.yml
customresourcedefinition.apiextensions.k8s.io/ingressroutes.traefik.containo.us created
customresourcedefinition.apiextensions.k8s.io/middlewares.traefik.containo.us created
customresourcedefinition.apiextensions.k8s.io/ingressroutetcps.traefik.containo.us created
customresourcedefinition.apiextensions.k8s.io/ingressrouteudps.traefik.containo.us created
customresourcedefinition.apiextensions.k8s.io/tlsoptions.traefik.containo.us created
customresourcedefinition.apiextensions.k8s.io/tlsstores.traefik.containo.us created
customresourcedefinition.apiextensions.k8s.io/traefikservices.traefik.containo.us created
clusterrole.rbac.authorization.k8s.io/traefik-ingress-controller created
clusterrolebinding.rbac.authorization.k8s.io/traefik-ingress-controller created

创建traefik-service.yml

apiVersion: v1
kind: Service
metadata:
  name: traefik
 
spec:
  type: NodePort # 注意在这里指定为 NodePort,让服务可以被访问
  ports:
    - protocol: TCP
      name: web # web端,这个端口作为负载均衡调度使用
      port: 8000
    - protocol: TCP
      name: admin # traefit的管理后台
      port: 8080
    - protocol: TCP
      name: websecure # https访问的web端
      port: 4443
  selector:
    app: traefik

应用 traefik 服务配置

kubectl apply -f traefik.service.yml
service/traefik created

创建traefik-deploy.yml

apiVersion: v1
kind: ServiceAccount
metadata:
  namespace: default
  name: traefik-ingress-controller
 
---
kind: Deployment
apiVersion: apps/v1
metadata:
  namespace: default
  name: traefik
  labels:
    app: traefik
 
spec:
  replicas: 1
  selector:
    matchLabels:
      app: traefik
  template:
    metadata:
      labels:
        app: traefik
    spec:
      serviceAccountName: traefik-ingress-controller
      containers:
        - name: traefik
          image: traefik:v2.2
          args:
            - --api.insecure
            - --accesslog
            - --entrypoints.web.Address=:8000
            - --entrypoints.websecure.Address=:4443
            - --providers.kubernetescrd
            - --certificatesresolvers.myresolver.acme.tlschallenge
            - --certificatesresolvers.myresolver.acme.email=foo@you.com
            - --certificatesresolvers.myresolver.acme.storage=acme.json
            - --certificatesresolvers.myresolver.acme.caserver=https://acme-staging-v02.api.letsencrypt.org/directory
          ports:
            - name: web
              containerPort: 8000
            - name: websecure
              containerPort: 4443
            - name: admin
              containerPort: 8080

应用 traefik 的发布配置

$ kubectl apply -f traefik-deploy.yml
serviceaccount/traefik-ingress-controller created
deployment.apps/traefik created

看下发布安装的情况

# traefik 已经是 Running 的状态，在 default 的命名空间下
$ kubectl get pods  -o wide               
NAME                       READY   STATUS    RESTARTS   AGE     IP           NODE          NOMINATED NODE   READINESS GATES
k8s-app-5c8757d6dd-nnkpc   1/1     Running   0          78m     10.244.2.2   kube-node-2   <none>           <none>
traefik-759c474dd5-55qvx   1/1     Running   0          2m23s   10.244.1.3   kube-node-1   <none>           <none>
 
# 看下 Services 也是 OK 的,type 是 NodePort
$ kubectl get services  -o wide
NAME              TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)                                        AGE     SELECTOR
k8s-app-service   NodePort    10.105.32.4    <none>        80:32383/TCP                                   91m     app=k8s-app
kubernetes        ClusterIP   10.96.0.1      <none>        443/TCP                                        7h40m   <none>
traefik           NodePort    10.100.89.55   <none>        8000:31421/TCP,8080:30655/TCP,4443:32266/TCP   18m     app=traefik

看下traefit的管理后台

# 30655 这个端口对应的是 8080

http://节点任意IP:30655