Menerapkan contoh layanan mikro Java di Amazon EKS dan mengekspos layanan mikro menggunakan Application Load Balancer

Vijay Thompson dan Akkamahadevi Hiremath, Amazon Web Services

Ringkasan

Pola ini menjelaskan cara menerapkan contoh layanan mikro Java sebagai aplikasi kontainer di Amazon Elastic Kubernetes Service (Amazon EKS) dengan menggunakan eksctl utilitas baris perintah dan Amazon Elastic Container Registry (Amazon ECR). Anda dapat menggunakan Application Load Balancer untuk memuat keseimbangan lalu lintas aplikasi.

Prasyarat dan batasan

Prasyarat

Batasan

Arsitektur

Tumpukan teknologi target

Arsitektur target

Diagram berikut menunjukkan arsitektur untuk containerizing Java microservice di Amazon EKS.

Alat

Epik

eksctl create cluster --name <your-cluster-name> --version <version-number> --nodes=1 --node-type=t2.small

package eksExample;
import static spark.Spark.get;

public class HelloWorld {
    public static void main(String[] args) {
        get("/", (req, res) -> {
            return "Hello World!";
        });
    }
}

├── Dockerfile
├── deployment.yaml
├── ingress.yaml
├── pom.xml
├── service.yaml
└── src
    └── main
        └── java
            └── eksExample
                └── HelloWorld.java

aws ecr get-login-password --region <region>| docker login --username <username> --password-stdin <account_number>.dkr.ecr.<region>.amazonaws.com
docker buildx build --platform linux/amd64 -t hello-world-java:v1 .
docker tag hello-world-java:v1 <account_number>.dkr.ecr.<region>.amazonaws.com/<repository_name>:v1
docker push <account_number>.dkr.ecr.<region>.amazonaws.com/<repository_name>:v1

Sumber daya terkait

Informasi tambahan

Contoh file POM

<?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>helloWorld</groupId>
  <artifactId>helloWorld</artifactId>
  <version>1.0-SNAPSHOT</version>


  <dependencies>
    <dependency>
      <groupId>com.sparkjava</groupId><artifactId>spark-core</artifactId><version>2.0.0</version>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId><artifactId>maven-jar-plugin</artifactId><version>2.4</version>
        <configuration><finalName>eksExample</finalName><archive><manifest>
              <addClasspath>true</addClasspath><mainClass>eksExample.HelloWorld</mainClass><classpathPrefix>dependency-jars/</classpathPrefix>
            </manifest></archive>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.1</version>
        <configuration><source>1.8</source><target>1.8</target></configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId><artifactId>maven-assembly-plugin</artifactId>
        <executions>
          <execution>
            <goals><goal>attached</goal></goals><phase>package</phase>
            <configuration>
              <finalName>eksExample</finalName>
              <descriptorRefs><descriptorRef>jar-with-dependencies</descriptorRef></descriptorRefs>
              <archive><manifest><mainClass>eksExample.HelloWorld</mainClass></manifest></archive>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

Contoh Dockerfile

FROM bellsoft/liberica-openjdk-alpine-musl:17

RUN apk add maven
WORKDIR /code

# Prepare by downloading dependencies
ADD pom.xml /code/pom.xml
RUN ["mvn", "dependency:resolve"]
RUN ["mvn", "verify"]

# Adding source, compile and package into a fat jar
ADD src /code/src
RUN ["mvn", "package"]

EXPOSE 4567
CMD ["java", "-jar", "target/eksExample-jar-with-dependencies.jar"]

Contoh berkas penyebaran

apiVersion: apps/v1
kind: Deployment
metadata:
  name: microservice-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app.kubernetes.io/name: java-microservice
  template:
    metadata:
      labels:
        app.kubernetes.io/name: java-microservice
    spec:
      containers:
      - name: java-microservice-container
        image: .dkr.ecr.amazonaws.com/:
        ports:
        - containerPort: 4567

Contoh file layanan

apiVersion: v1
kind: Service
metadata:
  name: "service-java-microservice"
spec:
  ports:
    - port: 80
      targetPort: 4567
      protocol: TCP
  type: NodePort
  selector:
    app.kubernetes.io/name: java-microservice

Contoh file sumber daya ingress

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: "java-microservice-ingress"
  annotations:
    kubernetes.io/ingress.class: alb
    alb.ingress.kubernetes.io/load-balancer-name: apg2
    alb.ingress.kubernetes.io/target-type: ip
  labels:
    app: java-microservice
spec:
  rules:
    - http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: "service-java-microservice"
                port:
                  number: 80