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k8s部署ingress-nginx
作者:mmseoamin日期:2023-12-21

k8s部署ingress-nginx

  • 前言
  • 一、ingress-nginx是什么
  • 二、ingress-nginx 实现原理
  • 三、部署ingress-nginx
  • 四、编写使用Ingress样例代码
  • 总结

    前言

    k8s服务对外暴露有三种方式 NodePort,LoadBalancer,Ingress

    Nodeport: 服务暴露需要在集群每个节点都开放一个同样的端口,通过nodtIp:nodePort来访问,如果服务数量多了,开放的端口就难以管理

    LoadBalancer: 大部分情况下只适用于支持外部负载均衡器的云提供商(AWS,阿里云,华为云等)使用。每个服务都会由云服务提供一个IP作为入口,转发相应的流量,但每个LoadBlancer Service都会产生费用,成本比较高。如果想要在内网环境中使用就需要部署网络负载均衡器,比如MetalLB等组件,它主要提供两个功能:地址分配和外部通知。

      所以这次我们主要来介绍Ingress的部署和使用,Ingress可以把进入到集群内部的请求转发到集群中的一些服务上,从而可以把服务映射到集群外部。Ingress 能把集群内Service 配置成外网能够访问的 URL,流量负载均衡,提供基于域名访问的虚拟主机等

    一、ingress-nginx是什么

      ingress-nginx 在 kubernetes 中是一个具有七层协议(HTTP/HTTPS)的路由转发机制,通过策略以及结合具体提供转发服务的 Ingress Controller 来实现基于灵活的 ingress 策略定义的服务路由功能,ingress controller目前主要有两种:基于nginx服务的ingress controller和基于traefik的ingress controller,我们重点讲一下ingress-nginx。

    k8s提供的ingress,github地址:https://github.com/kubernetes/ingress-nginx
    nginx提供的ingress,github地址:https://github.com/nginxinc/kubernetes-ingress
    

    ingress-nginx主要有两部分组成 Ingress和Ingress-controller

    Ingress: 是k8s的一种资源对象,用来描述一个路由请求的yaml文件,将Nginx的配置抽象成一个

        Ingress对象,每添加一个新的服务只需写一个新的Ingress的yaml文件即可

    Ingress-controller: 将新加入的Ingress转化成Nginx的配置文件并使之生效

    二、ingress-nginx 实现原理

      Ingress-nginx简单的理解就是你原来需要改Nginx配置,然后配置各种域名对应哪个Service,现在变成每添加一个server就创建一个Ingress对象(yaml文件),不再需要去改Nginx,直接 部署yam就行了。Ingress Controller通过与Kubernetes API交互,动态感知集群中Ingress规则变化,然后读取他,按照他自己模板生成一段Nginx配置,再写到ingress-nginx-controller Pod里,最后reload 一下。

    ingress具体的工作原理如下:

    1. 部署一个ingress资源对象,yaml文件写明了哪个域名对应k8s集群中的哪个service。
    2. ingress contronler通过与k8s的api进行交互,动态的去感知k8s集群中ingress服务规则的变化,然后读取它再根据ingress-controller中的nginx配置模板,生成一段对应的nginx配置。
    3. 把该配置动态的写到ingress-nginx-controller的pod里,该ingress-nginx-controller的pod里面运行着一个nginx服务,控制器会把生成的nginx配置写入到nginx的配置文件中,然后reload一下,使其配置生效,以此来达到域名分配置及动态更新的效果
    4. 浏览器请求先到ingress-nginx-controller 服务,再按照定义的ingress规则,转发到k8s集群中对应的service。

    三、部署ingress-nginx

    ingress-nginx 部署文档地址:https://kubernetes.github.io/ingress-nginx/deploy/
    

    k8s部署ingress-nginx,网站地址,第1张

    1. 获取部署文件 deploy.yaml

      k8s部署ingress-nginx,在这里插入图片描述,第2张文档中有直接用部署的命令,但是yaml文件中有镜像因为网络的原因无法下载,所以需要先下载文件,进行替换

        wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.8.2/deploy/static/provider/cloud/deploy.yaml
    

    下图的镜像修改为

    registry.cn-hangzhou.aliyuncs.com/google_containers/nginx-ingress-controller:v1.1.0
    

    修改前

    k8s部署ingress-nginx,在这里插入图片描述,第3张

    修改后

    k8s部署ingress-nginx,在这里插入图片描述,第4张

    下面两个镜像修改为

    registry.cn-hangzhou.aliyuncs.com/google_containers/kube-webhook-certgen:v1.1.1
    

    修改前

    k8s部署ingress-nginx,在这里插入图片描述,第5张k8s部署ingress-nginx,在这里插入图片描述,第6张

    修改后

    k8s部署ingress-nginx,在这里插入图片描述,第7张

    修改ingress-nginx的暴露方式。官网默认的是LoadBalancer,如果想使用需要安装MetalLB,我们先修改成为NodePort方式。

    也可以直接复制下面修改好的yaml文件

    apiVersion: v1
    kind: Namespace
    metadata:
      labels:
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
      name: ingress-nginx
    ---
    apiVersion: v1
    automountServiceAccountToken: true
    kind: ServiceAccount
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx
      namespace: ingress-nginx
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission
      namespace: ingress-nginx
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: Role
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx
      namespace: ingress-nginx
    rules:
    - apiGroups:
      - ""
      resources:
      - namespaces
      verbs:
      - get
    - apiGroups:
      - ""
      resources:
      - configmaps
      - pods
      - secrets
      - endpoints
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - ""
      resources:
      - services
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - networking.k8s.io
      resources:
      - ingresses
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - networking.k8s.io
      resources:
      - ingresses/status
      verbs:
      - update
    - apiGroups:
      - networking.k8s.io
      resources:
      - ingressclasses
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - coordination.k8s.io
      resourceNames:
      - ingress-nginx-leader
      resources:
      - leases
      verbs:
      - get
      - update
    - apiGroups:
      - coordination.k8s.io
      resources:
      - leases
      verbs:
      - create
    - apiGroups:
      - ""
      resources:
      - events
      verbs:
      - create
      - patch
    - apiGroups:
      - discovery.k8s.io
      resources:
      - endpointslices
      verbs:
      - list
      - watch
      - get
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: Role
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission
      namespace: ingress-nginx
    rules:
    - apiGroups:
      - ""
      resources:
      - secrets
      verbs:
      - get
      - create
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRole
    metadata:
      labels:
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx
    rules:
    - apiGroups:
      - ""
      resources:
      - configmaps
      - endpoints
      - nodes
      - pods
      - secrets
      - namespaces
      verbs:
      - list
      - watch
    - apiGroups:
      - coordination.k8s.io
      resources:
      - leases
      verbs:
      - list
      - watch
    - apiGroups:
      - ""
      resources:
      - nodes
      verbs:
      - get
    - apiGroups:
      - ""
      resources:
      - services
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - networking.k8s.io
      resources:
      - ingresses
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - ""
      resources:
      - events
      verbs:
      - create
      - patch
    - apiGroups:
      - networking.k8s.io
      resources:
      - ingresses/status
      verbs:
      - update
    - apiGroups:
      - networking.k8s.io
      resources:
      - ingressclasses
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - discovery.k8s.io
      resources:
      - endpointslices
      verbs:
      - list
      - watch
      - get
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRole
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission
    rules:
    - apiGroups:
      - admissionregistration.k8s.io
      resources:
      - validatingwebhookconfigurations
      verbs:
      - get
      - update
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: RoleBinding
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx
      namespace: ingress-nginx
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: Role
      name: ingress-nginx
    subjects:
    - kind: ServiceAccount
      name: ingress-nginx
      namespace: ingress-nginx
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: RoleBinding
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission
      namespace: ingress-nginx
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: Role
      name: ingress-nginx-admission
    subjects:
    - kind: ServiceAccount
      name: ingress-nginx-admission
      namespace: ingress-nginx
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRoleBinding
    metadata:
      labels:
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: ClusterRole
      name: ingress-nginx
    subjects:
    - kind: ServiceAccount
      name: ingress-nginx
      namespace: ingress-nginx
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRoleBinding
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: ClusterRole
      name: ingress-nginx-admission
    subjects:
    - kind: ServiceAccount
      name: ingress-nginx-admission
      namespace: ingress-nginx
    ---
    apiVersion: v1
    data:
      allow-snippet-annotations: "true"
    kind: ConfigMap
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-controller
      namespace: ingress-nginx
    ---
    apiVersion: v1
    kind: Service
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-controller
      namespace: ingress-nginx
    spec:
      externalTrafficPolicy: Local
      ipFamilies:
      - IPv4
      ipFamilyPolicy: SingleStack
      ports:
      - appProtocol: http
        name: http
        port: 80
        protocol: TCP
        targetPort: http
      - appProtocol: https
        name: https
        port: 443
        protocol: TCP
        targetPort: https
      selector:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
      type: LoadBalancer
    ---
    apiVersion: v1
    kind: Service
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-controller-admission
      namespace: ingress-nginx
    spec:
      ports:
      - appProtocol: https
        name: https-webhook
        port: 443
        targetPort: webhook
      selector:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
      type: ClusterIP
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-controller
      namespace: ingress-nginx
    spec:
      minReadySeconds: 0
      revisionHistoryLimit: 10
      selector:
        matchLabels:
          app.kubernetes.io/component: controller
          app.kubernetes.io/instance: ingress-nginx
          app.kubernetes.io/name: ingress-nginx
      strategy:
        rollingUpdate:
          maxUnavailable: 1
        type: RollingUpdate
      template:
        metadata:
          labels:
            app.kubernetes.io/component: controller
            app.kubernetes.io/instance: ingress-nginx
            app.kubernetes.io/name: ingress-nginx
            app.kubernetes.io/part-of: ingress-nginx
            app.kubernetes.io/version: 1.8.2
        spec:
          containers:
          - args:
            - /nginx-ingress-controller
            - --publish-service=$(POD_NAMESPACE)/ingress-nginx-controller
            - --election-id=ingress-nginx-leader
            - --controller-class=k8s.io/ingress-nginx
            - --ingress-class=nginx
            - --configmap=$(POD_NAMESPACE)/ingress-nginx-controller
            - --validating-webhook=:8443
            - --validating-webhook-certificate=/usr/local/certificates/cert
            - --validating-webhook-key=/usr/local/certificates/key
            env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            - name: LD_PRELOAD
              value: /usr/local/lib/libmimalloc.so
            image: registry.k8s.io/ingress-nginx/controller:v1.8.2@sha256:74834d3d25b336b62cabeb8bf7f1d788706e2cf1cfd64022de4137ade8881ff2
            imagePullPolicy: IfNotPresent
            lifecycle:
              preStop:
                exec:
                  command:
                  - /wait-shutdown
            livenessProbe:
              failureThreshold: 5
              httpGet:
                path: /healthz
                port: 10254
                scheme: HTTP
              initialDelaySeconds: 10
              periodSeconds: 10
              successThreshold: 1
              timeoutSeconds: 1
            name: controller
            ports:
            - containerPort: 80
              name: http
              protocol: TCP
            - containerPort: 443
              name: https
              protocol: TCP
            - containerPort: 8443
              name: webhook
              protocol: TCP
            readinessProbe:
              failureThreshold: 3
              httpGet:
                path: /healthz
                port: 10254
                scheme: HTTP
              initialDelaySeconds: 10
              periodSeconds: 10
              successThreshold: 1
              timeoutSeconds: 1
            resources:
              requests:
                cpu: 100m
                memory: 90Mi
            securityContext:
              allowPrivilegeEscalation: true
              capabilities:
                add:
                - NET_BIND_SERVICE
                drop:
                - ALL
              runAsUser: 101
            volumeMounts:
            - mountPath: /usr/local/certificates/
              name: webhook-cert
              readOnly: true
          dnsPolicy: ClusterFirst
          nodeSelector:
            kubernetes.io/os: linux
          serviceAccountName: ingress-nginx
          terminationGracePeriodSeconds: 300
          volumes:
          - name: webhook-cert
            secret:
              secretName: ingress-nginx-admission
    ---
    apiVersion: batch/v1
    kind: Job
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission-create
      namespace: ingress-nginx
    spec:
      template:
        metadata:
          labels:
            app.kubernetes.io/component: admission-webhook
            app.kubernetes.io/instance: ingress-nginx
            app.kubernetes.io/name: ingress-nginx
            app.kubernetes.io/part-of: ingress-nginx
            app.kubernetes.io/version: 1.8.2
          name: ingress-nginx-admission-create
        spec:
          containers:
          - args:
            - create
            - --host=ingress-nginx-controller-admission,ingress-nginx-controller-admission.$(POD_NAMESPACE).svc
            - --namespace=$(POD_NAMESPACE)
            - --secret-name=ingress-nginx-admission
            env:
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            image: registry.k8s.io/ingress-nginx/kube-webhook-certgen:v20230407@sha256:543c40fd093964bc9ab509d3e791f9989963021f1e9e4c9c7b6700b02bfb227b
            imagePullPolicy: IfNotPresent
            name: create
            securityContext:
              allowPrivilegeEscalation: false
          nodeSelector:
            kubernetes.io/os: linux
          restartPolicy: OnFailure
          securityContext:
            fsGroup: 2000
            runAsNonRoot: true
            runAsUser: 2000
          serviceAccountName: ingress-nginx-admission
    ---
    apiVersion: batch/v1
    kind: Job
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission-patch
      namespace: ingress-nginx
    spec:
      template:
        metadata:
          labels:
            app.kubernetes.io/component: admission-webhook
            app.kubernetes.io/instance: ingress-nginx
            app.kubernetes.io/name: ingress-nginx
            app.kubernetes.io/part-of: ingress-nginx
            app.kubernetes.io/version: 1.8.2
          name: ingress-nginx-admission-patch
        spec:
          containers:
          - args:
            - patch
            - --webhook-name=ingress-nginx-admission
            - --namespace=$(POD_NAMESPACE)
            - --patch-mutating=false
            - --secret-name=ingress-nginx-admission
            - --patch-failure-policy=Fail
            env:
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            image: registry.k8s.io/ingress-nginx/kube-webhook-certgen:v20230407@sha256:543c40fd093964bc9ab509d3e791f9989963021f1e9e4c9c7b6700b02bfb227b
            imagePullPolicy: IfNotPresent
            name: patch
            securityContext:
              allowPrivilegeEscalation: false
          nodeSelector:
            kubernetes.io/os: linux
          restartPolicy: OnFailure
          securityContext:
            fsGroup: 2000
            runAsNonRoot: true
            runAsUser: 2000
          serviceAccountName: ingress-nginx-admission
    ---
    apiVersion: networking.k8s.io/v1
    kind: IngressClass
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: nginx
    spec:
      controller: k8s.io/ingress-nginx
    ---
    apiVersion: admissionregistration.k8s.io/v1
    kind: ValidatingWebhookConfiguration
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission
    webhooks:
    - admissionReviewVersions:
      - v1
      clientConfig:
        service:
          name: ingress-nginx-controller-admission
          namespace: ingress-nginx
          path: /networking/v1/ingresses
      failurePolicy: Fail
      matchPolicy: Equivalent
      name: validate.nginx.ingress.kubernetes.io
      rules:
      - apiGroups:
        - networking.k8s.io
        apiVersions:
        - v1
        operations:
        - CREATE
        - UPDATE
        resources:
        - ingresses
      sideEffects: None
    [root@k8s-master 1.9]# vim deploy.yaml 
    [root@k8s-master 1.9]# cd ..
    [root@k8s-master ingress-nginx]# vim deploy.yaml 
    [root@k8s-master ingress-nginx]# vim deploy.yaml 
    [root@k8s-master ingress-nginx]# cat deploy.yaml 
    apiVersion: v1
    kind: Namespace
    metadata:
      labels:
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
      name: ingress-nginx
    ---
    apiVersion: v1
    automountServiceAccountToken: true
    kind: ServiceAccount
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx
      namespace: ingress-nginx
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission
      namespace: ingress-nginx
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: Role
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx
      namespace: ingress-nginx
    rules:
    - apiGroups:
      - ""
      resources:
      - namespaces
      verbs:
      - get
    - apiGroups:
      - ""
      resources:
      - configmaps
      - pods
      - secrets
      - endpoints
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - ""
      resources:
      - services
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - networking.k8s.io
      resources:
      - ingresses
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - networking.k8s.io
      resources:
      - ingresses/status
      verbs:
      - update
    - apiGroups:
      - networking.k8s.io
      resources:
      - ingressclasses
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - coordination.k8s.io
      resourceNames:
      - ingress-nginx-leader
      resources:
      - leases
      verbs:
      - get
      - update
    - apiGroups:
      - coordination.k8s.io
      resources:
      - leases
      verbs:
      - create
    - apiGroups:
      - ""
      resources:
      - events
      verbs:
      - create
      - patch
    - apiGroups:
      - discovery.k8s.io
      resources:
      - endpointslices
      verbs:
      - list
      - watch
      - get
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: Role
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission
      namespace: ingress-nginx
    rules:
    - apiGroups:
      - ""
      resources:
      - secrets
      verbs:
      - get
      - create
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRole
    metadata:
      labels:
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx
    rules:
    - apiGroups:
      - ""
      resources:
      - configmaps
      - endpoints
      - nodes
      - pods
      - secrets
      - namespaces
      verbs:
      - list
      - watch
    - apiGroups:
      - coordination.k8s.io
      resources:
      - leases
      verbs:
      - list
      - watch
    - apiGroups:
      - ""
      resources:
      - nodes
      verbs:
      - get
    - apiGroups:
      - ""
      resources:
      - services
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - networking.k8s.io
      resources:
      - ingresses
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - ""
      resources:
      - events
      verbs:
      - create
      - patch
    - apiGroups:
      - networking.k8s.io
      resources:
      - ingresses/status
      verbs:
      - update
    - apiGroups:
      - networking.k8s.io
      resources:
      - ingressclasses
      verbs:
      - get
      - list
      - watch
    - apiGroups:
      - discovery.k8s.io
      resources:
      - endpointslices
      verbs:
      - list
      - watch
      - get
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRole
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission
    rules:
    - apiGroups:
      - admissionregistration.k8s.io
      resources:
      - validatingwebhookconfigurations
      verbs:
      - get
      - update
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: RoleBinding
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx
      namespace: ingress-nginx
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: Role
      name: ingress-nginx
    subjects:
    - kind: ServiceAccount
      name: ingress-nginx
      namespace: ingress-nginx
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: RoleBinding
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission
      namespace: ingress-nginx
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: Role
      name: ingress-nginx-admission
    subjects:
    - kind: ServiceAccount
      name: ingress-nginx-admission
      namespace: ingress-nginx
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRoleBinding
    metadata:
      labels:
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: ClusterRole
      name: ingress-nginx
    subjects:
    - kind: ServiceAccount
      name: ingress-nginx
      namespace: ingress-nginx
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRoleBinding
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: ClusterRole
      name: ingress-nginx-admission
    subjects:
    - kind: ServiceAccount
      name: ingress-nginx-admission
      namespace: ingress-nginx
    ---
    apiVersion: v1
    data:
      allow-snippet-annotations: "true"
    kind: ConfigMap
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-controller
      namespace: ingress-nginx
    ---
    apiVersion: v1
    kind: Service
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-controller
      namespace: ingress-nginx
    spec:
      externalTrafficPolicy: Local
      ipFamilies:
      - IPv4
      ipFamilyPolicy: SingleStack
      ports:
      - appProtocol: http
        name: http
        port: 80
        protocol: TCP
        targetPort: http
      - appProtocol: https
        name: https
        port: 443
        protocol: TCP
        targetPort: https
      selector:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
      type: NodePort
    ---
    apiVersion: v1
    kind: Service
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-controller-admission
      namespace: ingress-nginx
    spec:
      ports:
      - appProtocol: https
        name: https-webhook
        port: 443
        targetPort: webhook
      selector:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
      type: ClusterIP
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-controller
      namespace: ingress-nginx
    spec:
      minReadySeconds: 0
      revisionHistoryLimit: 10
      selector:
        matchLabels:
          app.kubernetes.io/component: controller
          app.kubernetes.io/instance: ingress-nginx
          app.kubernetes.io/name: ingress-nginx
      strategy:
        rollingUpdate:
          maxUnavailable: 1
        type: RollingUpdate
      template:
        metadata:
          labels:
            app.kubernetes.io/component: controller
            app.kubernetes.io/instance: ingress-nginx
            app.kubernetes.io/name: ingress-nginx
            app.kubernetes.io/part-of: ingress-nginx
            app.kubernetes.io/version: 1.8.2
        spec:
          containers:
          - args:
            - /nginx-ingress-controller
            - --publish-service=$(POD_NAMESPACE)/ingress-nginx-controller
            - --election-id=ingress-nginx-leader
            - --controller-class=k8s.io/ingress-nginx
            - --ingress-class=nginx
            - --configmap=$(POD_NAMESPACE)/ingress-nginx-controller
            - --validating-webhook=:8443
            - --validating-webhook-certificate=/usr/local/certificates/cert
            - --validating-webhook-key=/usr/local/certificates/key
            env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            - name: LD_PRELOAD
              value: /usr/local/lib/libmimalloc.so
            image: registry.cn-hangzhou.aliyuncs.com/google_containers/nginx-ingress-controller:v1.1.0
            imagePullPolicy: IfNotPresent
            lifecycle:
              preStop:
                exec:
                  command:
                  - /wait-shutdown
            livenessProbe:
              failureThreshold: 5
              httpGet:
                path: /healthz
                port: 10254
                scheme: HTTP
              initialDelaySeconds: 10
              periodSeconds: 10
              successThreshold: 1
              timeoutSeconds: 1
            name: controller
            ports:
            - containerPort: 80
              name: http
              protocol: TCP
            - containerPort: 443
              name: https
              protocol: TCP
            - containerPort: 8443
              name: webhook
              protocol: TCP
            readinessProbe:
              failureThreshold: 3
              httpGet:
                path: /healthz
                port: 10254
                scheme: HTTP
              initialDelaySeconds: 10
              periodSeconds: 10
              successThreshold: 1
              timeoutSeconds: 1
            resources:
              requests:
                cpu: 100m
                memory: 90Mi
            securityContext:
              allowPrivilegeEscalation: true
              capabilities:
                add:
                - NET_BIND_SERVICE
                drop:
                - ALL
              runAsUser: 101
            volumeMounts:
            - mountPath: /usr/local/certificates/
              name: webhook-cert
              readOnly: true
          dnsPolicy: ClusterFirst
          nodeSelector:
            kubernetes.io/os: linux
          serviceAccountName: ingress-nginx
          terminationGracePeriodSeconds: 300
          volumes:
          - name: webhook-cert
            secret:
              secretName: ingress-nginx-admission
    ---
    apiVersion: batch/v1
    kind: Job
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission-create
      namespace: ingress-nginx
    spec:
      template:
        metadata:
          labels:
            app.kubernetes.io/component: admission-webhook
            app.kubernetes.io/instance: ingress-nginx
            app.kubernetes.io/name: ingress-nginx
            app.kubernetes.io/part-of: ingress-nginx
            app.kubernetes.io/version: 1.8.2
          name: ingress-nginx-admission-create
        spec:
          containers:
          - args:
            - create
            - --host=ingress-nginx-controller-admission,ingress-nginx-controller-admission.$(POD_NAMESPACE).svc
            - --namespace=$(POD_NAMESPACE)
            - --secret-name=ingress-nginx-admission
            env:
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            image: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-webhook-certgen:v1.1.1
            imagePullPolicy: IfNotPresent
            name: create
            securityContext:
              allowPrivilegeEscalation: false
          nodeSelector:
            kubernetes.io/os: linux
          restartPolicy: OnFailure
          securityContext:
            fsGroup: 2000
            runAsNonRoot: true
            runAsUser: 2000
          serviceAccountName: ingress-nginx-admission
    ---
    apiVersion: batch/v1
    kind: Job
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission-patch
      namespace: ingress-nginx
    spec:
      template:
        metadata:
          labels:
            app.kubernetes.io/component: admission-webhook
            app.kubernetes.io/instance: ingress-nginx
            app.kubernetes.io/name: ingress-nginx
            app.kubernetes.io/part-of: ingress-nginx
            app.kubernetes.io/version: 1.8.2
          name: ingress-nginx-admission-patch
        spec:
          containers:
          - args:
            - patch
            - --webhook-name=ingress-nginx-admission
            - --namespace=$(POD_NAMESPACE)
            - --patch-mutating=false
            - --secret-name=ingress-nginx-admission
            - --patch-failure-policy=Fail
            env:
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            image: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-webhook-certgen:v1.1.1
            imagePullPolicy: IfNotPresent
            name: patch
            securityContext:
              allowPrivilegeEscalation: false
          nodeSelector:
            kubernetes.io/os: linux
          restartPolicy: OnFailure
          securityContext:
            fsGroup: 2000
            runAsNonRoot: true
            runAsUser: 2000
          serviceAccountName: ingress-nginx-admission
    ---
    apiVersion: networking.k8s.io/v1
    kind: IngressClass
    metadata:
      labels:
        app.kubernetes.io/component: controller
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: nginx
    spec:
      controller: k8s.io/ingress-nginx
    ---
    apiVersion: admissionregistration.k8s.io/v1
    kind: ValidatingWebhookConfiguration
    metadata:
      labels:
        app.kubernetes.io/component: admission-webhook
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
        app.kubernetes.io/version: 1.8.2
      name: ingress-nginx-admission
    webhooks:
    - admissionReviewVersions:
      - v1
      clientConfig:
        service:
          name: ingress-nginx-controller-admission
          namespace: ingress-nginx
          path: /networking/v1/ingresses
      failurePolicy: Fail
      matchPolicy: Equivalent
      name: validate.nginx.ingress.kubernetes.io
      rules:
      - apiGroups:
        - networking.k8s.io
        apiVersions:
        - v1
        operations:
        - CREATE
        - UPDATE
        resources:
        - ingresses
      sideEffects: None
    
    1. 部署ingress-nginx
    kubectl apply -f deploy.yaml
    
    1. 检查是否部署成功
    kubectl get all -n ingress-nginx
    

    k8s部署ingress-nginx,在这里插入图片描述,第8张

    四、编写使用Ingress样例代码

    1. 准备后端springboot项目yaml文件
    apiVersion: v1
    kind: Service
    metadata:
      name: demo
      namespace: test
    spec:
      selector:
        app: demo
      ports:
        - port: 8080
          targetPort: 8080
      type: ClusterIP
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: demo
      namespace: test
      labels:
        app: demo
    spec:
      replicas: 1
      template:
        metadata:
          name: demo
          labels:
            app: demo
        spec:
          containers:
            - name: demo
              image: ingress-demo:1.0
              imagePullPolicy: IfNotPresent
              ports:
                - containerPort: 8080
          restartPolicy: Always
      selector:
        matchLabels:
          app: demo
    

    其中的镜像是自己写的java项目demo,这个需要自己准备了, 我就不提供了

    部署后端代码

    kubectl apply -f demo.yaml
    
    1. 准备Ingress资源对象yaml文件
    apiVersion: networking.k8s.io/v1
    kind: Ingress
    metadata:
      namespace: test
      name: demo-ingress
    spec:
      ingressClassName: nginx
      rules:
        - host: test.cisco.com
          http:
            paths:
              - path: /demo
                pathType: Prefix
                backend:
                  service:
                    name: demo
                    port:
                      number: 8080
    

    部署ingress

    kubectl apply -f demo-ingress.yaml
    
    1. 修改本地hosts 配置域名 test.cisco.com

      k8s部署ingress-nginx,在这里插入图片描述,第9张

    2. 浏览器访问后端方法

      k8s部署ingress-nginx,在这里插入图片描述,第10张

      成功访问到了后端接口。

    注意:千万不要开代理,不然访问不到,本人就是因为开了clash的原因,导致一直访问不到,开始怀疑人生了。

    总结

    以上就是ingress的介绍,部署和实际使用样例,如有不足之处,还请各位大佬纠正。