微服务 在 k8s 中部署网关 Gateway 服务

在 k8s 中部署网关 Gateway 服务

[root@master microservic-test]# cd gateway-service/
[root@master gateway-service]# ls
Dockerfile  pom.xml  src  target
[root@master gateway-service]# cd target/
[root@master target]# ls
classes  gateway-service.jar  gateway-service.jar.original  generated-sources  maven-archiver  maven-status


[root@master gateway-service]# cat Dockerfile 
FROM java:8-jdk-alpine
RUN  apk add -U tzdata && \
     ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
COPY ./target/gateway-service.jar ./
EXPOSE 9999
CMD java -jar /gateway-service.jar

[root@master gateway-service]# docker build -t reg.harbor.com/microservice/gateway:v1 .
Sending build context to Docker daemon  43.45MB
Step 1/5 : FROM java:8-jdk-alpine
 ---> 3fd9dd82815c
Step 2/5 : RUN  apk add -U tzdata &&      ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
 ---> Using cache
 ---> a9034491fdd5
Step 3/5 : COPY ./target/gateway-service.jar ./
 ---> db38bc07283d
Step 4/5 : EXPOSE 9999
 ---> Running in a292d38e4aaa
Removing intermediate container a292d38e4aaa
 ---> 75e7856ae711
Step 5/5 : CMD java -jar /gateway-service.jar
 ---> Running in 349f78c72d84
Removing intermediate container 349f78c72d84
 ---> 292feb2950b5
Successfully built 292feb2950b5
Successfully tagged reg.harbor.com/microservice/gateway:v1



[root@master gateway-service]# docker push reg.harbor.com/microservice/gateway:v1
The push refers to repository [reg.harbor.com/microservice/gateway]
7f8ea654d86b: Pushed 
8994a8716f11: Mounted from microservice/eureka 
a1e7033f082e: Mounted from microservice/eureka 
78075328e0da: Mounted from microservice/eureka 
9f8566ee5135: Mounted from microservice/eureka 
v1: digest: sha256:32bd210362f8638c80e967d6ca7744ddfd16953c58d7c4d2d17198cd79e7093b size: 1370

2)服务的配置文件

为所有微服务提供统一的入口，只要来的请求都会经过gateway

[root@master ~]# cd microservic-test/gateway-service/src/main/resources/
[root@master resources]# cat application-fat.yml 
spring:
  cloud:
    gateway:
      discovery:
        locator:
          #开启以服务id去注册中心获取转发地址
          enabled: true
          ##灏..serviceId
          lower-case-service-id: true
      routes:
        - id: product-service
          uri: lb://product-service
          filters:
            - StripPrefix=1
          predicates:
            - Path=/product/**

        - id: order-service
          uri: lb://order-service
          filters:
            - StripPrefix=1
          predicates:
            - Path=/order/**

        - id: stock-service
          uri: lb://stock-service
          filters:
            - StripPrefix=1
          predicates:
            - Path=/stock/**

eureka:
  instance:
    prefer-ip-address: true
  client:
    register-with-eureka: true
    fetch-registry: true
    service-url:
      defaultZone: http://eureka-0.eureka.ms:8888/eureka,http://eureka-1.eureka.ms:8888/eureka,http://eureka-2.eureka.ms:8888/eureka

  3）部署服务

[root@master k8s]# cat gateway.yaml 
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: gateway 
  namespace: ms 
spec:
  rules:
    - host: gateway.ctnrs.com 
      http:
        paths:
        - path: /
          backend:
            serviceName: gateway
            servicePort: 9999
---
apiVersion: v1
kind: Service
metadata:
  name: gateway
  namespace: ms
spec:
  ports:
  - port: 9999 
    name: gateway
  selector:
    project: ms
    app: gateway
---
apiVersion: apps/v1
kind: Deployment 
metadata:
  name: gateway
  namespace: ms 
spec:
  replicas: 1
  selector:
    matchLabels:
      project: ms
      app: gateway
  template:
    metadata:
      labels:
        project: ms 
        app: gateway
    spec:
      imagePullSecrets:
      - name: registry-pull-secret
      containers:
      - name: gateway
        image: reg.harbor.com/microservice/gateway:v1
        imagePullPolicy: Always
        ports:
          - protocol: TCP
            containerPort: 9999 
        resources:
          requests:
            cpu: 0.5
            memory: 256Mi
          limits:
            cpu: 1
            memory: 1Gi
        readinessProbe:
          tcpSocket:
            port: 9999
          initialDelaySeconds: 60
          periodSeconds: 10
        livenessProbe:
          tcpSocket:
            port: 9999
          initialDelaySeconds: 60
          periodSeconds: 10

[root@master k8s]# kubectl get pod -n ms
NAME                       READY   STATUS    RESTARTS   AGE
eureka-0                   1/1     Running   0          23h
eureka-1                   1/1     Running   0          22h
eureka-2                   1/1     Running   0          22h
gateway-77bb7dbbc8-xqkk5   1/1     Running   0          2m18s


[root@master k8s]# kubectl get svc -n ms
NAME      TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE
eureka    ClusterIP   None           <none>        8888/TCP   23h
gateway   ClusterIP   10.233.53.75   <none>        9999/TCP   10m

[root@master k8s]# kubectl get ingress -n ms
NAME      CLASS    HOSTS               ADDRESS   PORTS   AGE
eureka    <none>   eureka.ctnrs.com              80      22h
gateway   <none>   gateway.ctnrs.com             80      10s


[root@master k8s]# kubectl describe ingress gateway -n ms
Name:             gateway
Namespace:        ms
Address:          
Default backend:  default-http-backend:80 (<error: endpoints "default-http-backend" not found>)
Rules:
  Host               Path  Backends
  ----               ----  --------
  gateway.ctnrs.com  
                     /   gateway:9999 (10.233.90.39:9999)
Annotations:         Events:
  Type               Reason  Age    From                      Message
  ----               ------  ----   ----                      -------
  Normal             CREATE  7m12s  nginx-ingress-controller  Ingress ms/gateway
  Normal             CREATE  7m12s  nginx-ingress-controller  Ingress ms/gateway

可以看到网关服务的pod也注册到eureak，所以启动服务的时候默认都会注册到eureak