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Ingress使用示例

news 2025/9/20 7:01:00

当需要「一个IP，多个网站」时（基于域名路由）

场景目标

一个IP：192.168.100.100 (Ingress Controller的External-IP)
三个域名：
- app1.com -> 转发到 app1-service
- app2.com -> 转发到 app2-service
- api.app1.com -> 转发到 api-service

步骤一：部署后端应用和Service

1.部署三个简单的Web应用（例如Nginx）并为它们创建对应的Service。

apiVersion: apps/v1
kind: Deployment
metadata:name: app1-deployment
spec:replicas: 2selector:matchLabels:app: app1template:metadata:labels:app: app1 # Pod标签，会被Service的selector匹配spec:containers:- name: nginximage: nginxports:- containerPort: 80
---
apiVersion: apps/v1
kind: Deployment
metadata:name: app2-deployment
spec:replicas: 2selector:matchLabels:app: app2template:metadata:labels:app: app2spec:containers:- name: nginximage: nginxports:- containerPort: 80
---
apiVersion: apps/v1
kind: Deployment
metadata:name: api-deployment
spec:replicas: 2selector:matchLabels:app: apitemplate:metadata:labels:app: apispec:containers:- name: nginximage: nginxports:- containerPort: 80

2. 创建Service (`services.yaml`)

apiVersion: v1
kind: Service
metadata:name: app1-service # Service名称，Ingress规则会引用这个名字
spec:selector:app: app1 # 选择标签为 app: app1 的Podports:- protocol: TCPport: 80 # Service端口targetPort: 80 # Pod端口type: ClusterIP
---
apiVersion: v1
kind: Service
metadata:name: app2-service
spec:selector:app: app2ports:- protocol: TCPport: 80targetPort: 80type: ClusterIP
---
apiVersion: v1
kind: Service
metadata:name: api-service
spec:selector:app: apiports:- protocol: TCPport: 80targetPort: 80type: ClusterIP

步骤二：编写Ingress规则

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:name: my-main-ingressannotations:# 明确指定使用nginx ingress controllerkubernetes.io/ingress.class: "nginx"# 其他常用注解示例：# nginx.ingress.kubernetes.io/rewrite-target: / # 如果需要重写路径# nginx.ingress.kubernetes.io/ssl-redirect: "false" # 关闭强制HTTPS跳转（默认true）
spec:# rules字段定义了所有的路由规则rules:# 规则一：匹配主机名 app1.com- host: app1.comhttp:paths:- path: / # 匹配根路径及其所有子路径pathType: Prefixbackend:service:name: app1-service # 转发到名为app1-service的Serviceport:number: 80 # 转发到该Service的80端口# 规则二：匹配主机名 app2.com- host: app2.comhttp:paths:- path: /pathType: Prefixbackend:service:name: app2-serviceport:number: 80# 规则三：匹配主机名 api.app1.com- host: api.app1.comhttp:paths:- path: /pathType: Prefixbackend:service:name: api-serviceport:number: 80# 您可以继续添加更多规则...# - host: another.example.com#   http:#     paths:#     - path: /#       pathType: Prefix#       backend:#         service:#           name: another-service#           port:#             number: 80