k8s部署Ingress并创建规则的详细介绍

一、Ingress介绍

Ingress由两部分组成：Ingress controller和Ingress服务
通过 Service 发现 Pod 进行关联。基于域名访问
通过 Ingress Controller 实现 Pod 负载均衡
支持 TCP/UDP 4 层负载均衡和 HTTP 7 层负载均衡
底层实现是nignx

二、Ingress文件获取

1.1 、说明

官方地址：https://github.com/kubernetes/ingress-nginx

部署文件说明

## 这个地址被墙,需要科学上网！！！
# mandatory.yaml为ingress所有资源yml文件的集合
# 若是单独部署，需要分别下载configmap.yaml、namespace.yaml、rbac.yaml、service-nodeport.yaml、with-rbac.yaml
wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/mandatory.yaml
# service-nodeport.yaml为ingress通过nodeport对外提供服务，注意默认nodeport暴露端口为随机，可以编辑该文件自定义端口
wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/baremetal/service-nodeport.yaml

1.2 、文件内容

ingress-controller.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
kind: ConfigMap
  name: nginx-configuration
  namespace: ingress-nginx
  name: tcp-services
  name: udp-services
kind: ServiceAccount
  name: nginx-ingress-serviceaccount
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
  name: nginx-ingress-clusterrole
rules:
  - apiGroups:
      - ""
    resources:
      - configmaps
      - endpoints
      - nodes
      - pods
      - secrets
    verbs:
      - list
      - watch
      - get
      - services
      - "extensions"
      - ingresses
      - events
      - create
      - patch
      - ingresses/status
      - update
kind: Role
  name: nginx-ingress-role
      - namespaces
    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"
kind: RoleBinding
  name: nginx-ingress-role-nisa-binding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
subjects:
  - kind: ServiceAccount
    name: nginx-ingress-serviceaccount
    namespace: ingress-nginx
kind: ClusterRoleBinding
  name: nginx-ingress-clusterrole-nisa-binding
  kind: ClusterRole
apiVersion: apps/v1
kind: DaemonSet 
  name: nginx-ingress-controller
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: ingress-nginx
      app.kubernetes.io/part-of: ingress-nginx
  template:
    metadata:
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
      annotations:
        prometheus.io/port: "10254"
        prometheus.io/scrape: "true"
    spec:
      hostNetwork: true
      serviceAccountName: nginx-ingress-serviceaccount
      containers:
        - name: nginx-ingress-controller
          image: siriuszg/nginx-ingress-controller:0.20.0
          args:
            - /nginx-ingress-controller
            - --configmap=$(POD_NAMESPACE)/nginx-configuration
            - --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services
            - --udp-services-configmap=$(POD_NAMESPACE)/udp-services
            - --publish-service=$(POD_NAMESPACE)/ingress-nginx
            - --annotations-prefix=nginx.ingress.kubernetes.io
          securityContext:
            allowPrivilegeEscalation: true
            capabilities:
              drop:
                - ALL
              add:
                - NET_BIND_SERVICE
            # www-data -> 33
            runAsUser: 33
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
                  fieldPath: metadata.namespace
          ports:
            - name: http
              containerPort: 80
            - name: https
              containerPort: 443
          livenessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          readinessProbe:
kind: Service
  #type: NodePort
  ports:
  - name: http
    port: 80
    targetPort: 80
    protocol: TCP
  - name: https
    port: 443
    targetPort: 443

三、k8s应用 ingress-controller.yaml

应用

kubectl apply -f ingress-controller.yaml

如图：

查看是否完成

kubectl get pods --all-namespaces

四、创建Ingress规则

如果没有部署和服务==>查看k8s部署并映射tomcat8

查看自己创建的服务，以tomcat8为例

kubectl get all

自己创建文件 ingress-tomcat8.yaml

vi ingress-tomcat8.yaml

ingress-tomcat8.yaml规则内容

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: web
spec:
  rules: 
  - host: k8s.tomcat8.com
    http:
      paths:
        - backend:
           serviceName: tomcat8
           servicePort: 80

如图: