elasticsearch-无法将spring引导应用程序连接到logstash-它始终引发未知主机异常

当我尝试运行 docker 容器中的所有内容时，我在将我的 spring boot 应用程序与 logstash 连接时遇到问题。分享一下我做了什么：

这是我的 docker-compose.yaml

version: '3.8'

services:

  learndockerpostgres:
    container_name: learndockerpostgres
    build: .
    ports:
      - 8080:8080
    depends_on:
      - postgres_db
      - logstash
    networks:
      - learn-application

  postgres_db:
    image: postgres:latest
    container_name: postgres_db
    restart: always
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: root
      POSTGRES_DB: client
    ports:
      - 5432:5432
    networks:
      - learn-application

  postgres_admin:
    image: dpage/pgadmin4
    container_name: pgadmin
    restart: always
    environment:
      PGADMIN_DEFAULT_EMAIL: admin@admin.com
      PGADMIN_DEFAULT_PASSWORD: root
    ports:
      - 5050:80
    depends_on:
      - postgres_db

  rabbitmq:
    image: rabbitmq:3.8-management-alpine
    container_name: rabbitmq
    environment:
      RABBITMQ_DEFAULT_USER: myuser
      RABBITMQ_DEFAULT_PASS: mypassword
    ports:
      - 5672:5672
      - 15672:15672
    networks:
      - learn-application

  elasticsearch:
    container_name: elasticsearch
    image: elasticsearch:7.14.1
    volumes:
      - elasticsearch:/usr/share/elasticsearch/data
    restart: unless-stopped
    environment:
      discovery.type: single-node
      ES_JAVA_OPTS: "-Xmx256m -Xms256m"
      ELASTIC_PASSWORD: changeme
      xpack.security.enabled: true
    ports:
      - 9200:9200
      - 9300:9300
    networks:
      - elastic

  logstash:
    container_name: logstash
    image: logstash:7.14.1
    volumes:
      - ./env/logstash/pipeline:/usr/share/logstash/pipeline:ro
    restart: unless-stopped
    environment:
      LS_JAVA_OPTS: "-Xmx256m -Xms256m"
      ELASTIC_USER: elastic
      ELASTIC_PASSWORD: changeme
      XPACK_MONITORING_ELASTICSEARCH_USERNAME: elastic
      XPACK_MONITORING_ELASTICSEARCH_PASSWORD: changeme
      XPACK_MONITORING_ELASTICSEARCH_HOSTS: "elasticsearch:9200"
      XPACK_MONITORING_ENABLED: "true"
    ports:
      - 5000:5000
      - 9600:9600
    networks:
      - elastic
      - learn-application
    depends_on:
      - elasticsearch

  kibana:
    container_name: kibana
    image: kibana:7.14.1
    restart: unless-stopped
    environment:
      ELASTICSEARCH_USERNAME: elastic
      ELASTICSEARCH_PASSWORD: changeme
      XPACK_MONITORING_UI_CONTAINER_ELASTICSEARCH_ENABLED: "true"
    ports:
      - 5601:5601
    depends_on:
      - elasticsearch
      - logstash
    networks:
      - elastic

volumes:
  elasticsearch:

networks:
  elastic:
  learn-application:

这是我的Dockerfile：

FROM openjdk:11
VOLUME /learndockerpostgres
EXPOSE 8080
ARG JAR_FILE=target/learn-docker-postgres-0.0.1-SNAPSHOT.jar
ADD ${JAR_FILE} learn-docker-postgres.jar
ENTRYPOINT ["java", "-jar", "learn-docker-postgres.jar"]

这是我的 application.yaml 文件：

server:
    port: 8080
    application:
        name: learn-docker-postgres

logstash:
    host: logstash
    port: 5000

spring:
    jpa:
        show-sql: true
        generate-ddl: true
        properties:
            hibernate:
                dialect: org.hibernate.dialect.PostgreSQLDialect

        hibernate:
            ddl-auto: update

    datasource:
        driver-class-name: org.postgresql.Driver
        url: jdbc:postgresql://postgres_db:5432/client
        username: postgres
        password: root

项目：https://gitlab.com/markozivkovic95/learn-docker-postgres/-/tree/main/我看不出任何问题，但例外情况是：

00:17:54,988 |-WARN in net.logstash.logback.appender.LogstashTcpSocketAppender[logstash] - Log destination logstash:5000: connection failed. java.net.ConnectException: Connection refused (Connection refused)
at java.net.ConnectException: Connection refused (Connection refused)
at  at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
at  at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:412)
at  at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:255)
at  at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:237)
at  at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at  at java.base/java.net.Socket.connect(Socket.java:609)
at  at net.logstash.logback.appender.AbstractLogstashTcpSocketAppender$TcpSendingEventHandler.openSocket(AbstractLogstashTcpSocketAppender.java:717)
at  at net.logstash.logback.appender.AbstractLogstashTcpSocketAppender$TcpSendingEventHandler.onStart(AbstractLogstashTcpSocketAppender.java:637)
at  at net.logstash.logback.appender.AsyncDisruptorAppender$EventClearingEventHandler.onStart(AsyncDisruptorAppender.java:351)
at  at net.logstash.logback.encoder.com.lmax.disruptor.BatchEventProcessor.notifyStart(BatchEventProcessor.java:224)
at  at net.logstash.logback.encoder.com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:120)
at  at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at  at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at  at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at  at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at  at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at  at java.base/java.lang.Thread.run(Thread.java:829)