Elasticsearch客户端无法连接docker容器中的elasticsearch答案

【问题标题】：Elasticsearch client can't connect elasticsearch in docker containerElasticsearch客户端无法连接docker容器中的elasticsearch
【发布时间】：2020-07-03 06:08:15
【问题描述】：

我正在尝试在容器内使用来自 Java 应用程序的 Elasticsearch，该应用程序也在容器内。如果没有 docker 容器，我的应用程序会正确连接到本地 elasticsearch。我的 docker-compose 文件：

version: "3.7"

volumes:
  postgis:

services:
  database:
    container_name: database
    build:
      postgis/
    ports:
      - 5432:5432
    volumes:
      - ./postgis:/var/lib/postgresql:rw
    restart: on-failure
    networks:
      - net

  application:
    depends_on:
      - database
      - es
    container_name: application
    build:
      application/
    ports:
      - $LORRYAPP_DEBUG_PORT:8080
    volumes:
      - ./application:/app:rw
    environment:
      LORRYAPP_OPTS: $LORRYAPP_OPTS
    restart: on-failure
    networks:
      - net

  es:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.6.1
    ports:
      - "9200:9200"
      - "9300:9300"
    environment:
      - discovery.type=single-node
    networks:
      - net

networks:
  net:
    driver: bridge

在ctor中初始化es-client：

public ElasticSearchDao(ObjectMapper mapper) {
    this.esClient = new RestHighLevelClient(RestClient.builder(HttpHost.create("http://localhost:9200")));
    this.mapper = mapper;
}

堆栈跟踪：

java.net.ConnectException: Connection refused
        at org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:788) ~[elasticsearch-rest-client-7.4.0.jar!/:7.4.0]
        at org.elasticsearch.client.RestClient.performRequest(RestClient.java:218) ~[elasticsearch-rest-client-7.4.0.jar!/:7.4.0]
        at org.elasticsearch.client.RestClient.performRequest(RestClient.java:205) ~[elasticsearch-rest-client-7.4.0.jar!/:7.4.0]
        at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1454) ~[elasticsearch-rest-high-level-client-7.4.0.jar!/:7.4.0]
        at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1424) ~[elasticsearch-rest-high-level-client-7.4.0.jar!/:7.4.0]
        at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1394) ~[elasticsearch-rest-high-level-client-7.4.0.jar!/:7.4.0]
        at org.elasticsearch.client.RestHighLevelClient.index(RestHighLevelClient.java:836) ~[elasticsearch-rest-high-level-client-7.4.0.jar!/:7.4.0]

ES 可通过浏览器访问。 http://0.0.0.0:9200/,http://127.0.0.1:9200/,http://localhost:9200/回复：

{
  "name" : "254bdb7bcc2a",
  "cluster_name" : "docker-cluster",
  "cluster_uuid" : "vm537RNGSiG3dW8ag2MDTw",
  "version" : {
    "number" : "7.6.1",
    "build_flavor" : "default",
    "build_type" : "docker",
    "build_hash" : "aa751e09be0a5072e8570670309b1f12348f023b",
    "build_date" : "2020-02-29T00:15:25.529771Z",
    "build_snapshot" : false,
    "lucene_version" : "8.4.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

【问题讨论】：

如果你说的是跨容器，那就不是 localhost。 Docker 网络很好地解析了容器名称，所以 es 在你的情况下
Url 应该设置为http://es:9200 用于容器间通信。

标签： java spring-boot docker elasticsearch docker-compose

【解决方案1】：

我认为这可能与我很久以前提出的问题有关。

Accessing Elasticsearch Docker instance using NEST

它针对 C#，这确实是容器的问题。在我的情况下发生的事情是客户端将连接到 docker，获取仅用于容器间通信的内部 IP，然后尝试使用该 IP 保持连接打开 - 这显然不起作用。

【讨论】：

那么你做了什么？
@SriniMurthy 你读过我在这里链接的问题吗？ ;)