Kubernetes 上的客户端负载均衡

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>io.vertx.howtos</groupId>
  <artifactId>k8s-client-slide-lb-microservice</artifactId>
  <version>1.0.0-SNAPSHOT</version>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <vertx.version>5.0.0.CR2</vertx.version>

    <main.verticle>io.vertx.howtos.clientsidelb.MicroServiceVerticle</main.verticle>
    <launcher.class>io.vertx.launcher.application.VertxApplication</launcher.class>

  </properties>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>io.vertx</groupId>
        <artifactId>vertx-stack-depchain</artifactId>
        <version>${vertx.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <dependencies>
    <dependency>
      <groupId>io.vertx</groupId>
      <artifactId>vertx-core</artifactId>
    </dependency>
    <dependency>
      <groupId>io.vertx</groupId>
      <artifactId>vertx-launcher-application</artifactId>
    </dependency>
    <dependency>
      <groupId>io.vertx</groupId>
      <artifactId>vertx-service-resolver</artifactId>
    </dependency>

  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.13.0</version>
        <configuration>
          <release>11</release>
        </configuration>
      </plugin>
      <plugin>
        <groupId>com.google.cloud.tools</groupId>
        <artifactId>jib-maven-plugin</artifactId>
        <version>3.4.4</version>
        <configuration>
          <to>
            <image>client-side-lb/microservice</image>
          </to>
          <container>
            <mainClass>${launcher.class}</mainClass>
            <args>
              <arg>${main.verticle}</arg>
            </args>
            <ports>
              <port>8080</port>
            </ports>
          </container>
        </configuration>
      </plugin>
    </plugins>
  </build>

</project>

plugins {
  java
  application
  id("com.google.cloud.tools.jib") version "3.4.4"
}

repositories {
  mavenCentral()
}

val vertxVersion = "5.0.0.CR2"
val verticle = "io.vertx.howtos.clientsidelb.MicroServiceVerticle"

dependencies {
  implementation("io.vertx:vertx-core:${vertxVersion}")
  implementation("io.vertx:vertx-service-resolver:${vertxVersion}")
  implementation("io.vertx:vertx-launcher-application:${vertxVersion}")
}

jib {
  to {
    image = "client-side-lb/microservice"
  }
  container {
    mainClass = "io.vertx.launcher.application.VertxApplication"
    args = listOf(verticle)
    ports = listOf("8080")
  }
}

tasks.wrapper {
  gradleVersion = "8.11.1"
}

apiVersion: apps/v1
kind: Deployment
metadata:
  name: microservice-deployment
  labels:
    app: microservice
spec:
  replicas: 1
  selector:
    matchLabels:
      app: microservice
  template:
    metadata:
      labels:
        app: microservice
    spec:
      containers:
        - name: microservice
          image: client-side-lb/microservice:latest
          imagePullPolicy: IfNotPresent
          env:
            - name: HTTP_PORT
              value: "8080"
          ports:
            - containerPort: 8080

apiVersion: v1
kind: Service
metadata:
  name: microservice
spec:
  selector:
    app: microservice
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080
  type: LoadBalancer

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: observe-endpoints
  namespace: default
rules:
  - apiGroups: [""]
    resources: ["endpoints"]
    verbs: ["get", "watch", "list"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: observe-endpoints
  namespace: default
roleRef:
  kind: Role
  name: observe-endpoints
  apiGroup: rbac.authorization.k8s.io
subjects:
  - kind: ServiceAccount
    name: default
    namespace: default