无法连接到我的 Elasticsearch 实例：NoNodeAvailableException

Question

无法连接到我的 Elasticsearch，开始于：

docker-compose up

运行命令：

curl -XGET http://localhost:9200/_nodes/http?pretty

输出：

{
  "cluster_name" : "elasticsearch",
  "nodes" : {
    "qD18rHzhQaexExUw5sBgXg" : {
      "name" : "Scanner",
      "transport_address" : "172.19.0.3:9300",
      "host" : "172.19.0.3",
      "ip" : "172.19.0.3",
      "version" : "6.2.3",
      "build" : "fcbb46d",
      "http_address" : "172.19.0.3:9200",
      "http" : {
        "bound_address" : [ "0.0.0.0:9200" ],
        "publish_address" : "172.19.0.3:9200",
        "max_content_length_in_bytes" : 104857600
      }
    }
  }
}

与传输客户端连接：

public Client client() throws Exception {
    Settings settings = Settings.builder()
        .put("spring.data.elasticsearch.cluster-nodes", "localhost:9300")
        .build();

    TransportClient client = TransportClient.builder()
        .settings(settings)
        .build()
        .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300));
    return client;
}

得到错误：

Caused by: NoNodeAvailableException[None of the configured nodes are available: [{#transport#-1}{localhost}{127.0.0.1:9300}]]
    at org.elasticsearch.client.transport.TransportClientNodesService.ensureNodesAreAvailable(TransportClientNodesService.java:326)
    at org.elasticsearch.client.transport.TransportClientNodesService.execute(TransportClientNodesService.java:223)

docker-compose.yml

services:
  elasticsearch:
    image: elasticsearch
    ports:
      - '9200:9200'
      - '9300:9300'
  kibana:
    image: kibana
    ports:
      - '5601:5601'
    environment:
      - ELASTICSEARCH_URL=http://elasticsearch:9200

Dockerfile

FROM elasticsearch, kibana
EXPOSE 9200
EXPOSE 9300

（运行本地安装的 Elasticsearch 没有 Docker 它可以工作！）

我做错了什么？知道如何解决吗？

Answer 1

传输端点绑定在 elasticsearch 容器内的本地主机上。这就是为什么它只能从容器本身访问。

传输端点应该绑定到elasticsearch容器中的0.0.0.0（"transport_address" : "0.0.0.0:9300"），并且可以通过localhost:9300在主机上的localhost访问它。

因此，您可以使用以下docker-compose.yaml：

version: "3"
services:
  elasticsearch:
    image: elasticsearch
    command: "-Etransport.host=0.0.0.0"
    ports:
      - '9200:9200'
      - '9300:9300'
  kibana:
    image: kibana
    ports:
      - '5601:5601'
    environment:
      - ELASTICSEARCH_URL=http://elasticsearch:9200

更新：

如果你只是使用上面的docker-compose.yaml，elasticsearch容器在启动时会失败并出现以下错误：

elasticsearch_1  | [2018-03-26T07:44:13,475][INFO ][o.e.n.Node               ] [rzYPgrJ] starting ...
elasticsearch_1  | [2018-03-26T07:44:13,663][INFO ][o.e.t.TransportService   ] [rzYPgrJ] publish_address {172.17.0.2:9300}, bound_addresses {0.0.0.0:9300}
elasticsearch_1  | [2018-03-26T07:44:13,688][INFO ][o.e.b.BootstrapChecks    ] [rzYPgrJ] bound or publishing to a non-loopback address, enforcing bootstrap checks
elasticsearch_1  | ERROR: [1] bootstrap checks failed
elasticsearch_1  | [1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
elasticsearch_1  | [2018-03-26T07:44:13,696][INFO ][o.e.n.Node               ] [rzYPgrJ] stopping ...
elasticsearch_1  | [2018-03-26T07:44:13,747][INFO ][o.e.n.Node               ] [rzYPgrJ] stopped
elasticsearch_1  | [2018-03-26T07:44:13,747][INFO ][o.e.n.Node               ] [rzYPgrJ] closing ...
elasticsearch_1  | [2018-03-26T07:44:13,762][INFO ][o.e.n.Node               ] [rzYPgrJ] closed

那是因为我们将 transport endpoint 更改为在 0.0.0.0 上收听。

为了修复它，需要将主机上的vm.max_map_count sysctl 参数至少增加到262144：

sudo sysctl -w vm.max_map_count=262144

现在你可以通过docker-compose up成功启动两个容器了。

Answer 2

当降级到 elasticsearch:2.4.4 时它可以工作，我怀疑它与 SpringData 与最新的 Elasticsearch 不兼容有关。

   ...
    services:
      elasticsearch:
        image: elasticsearch:2.4.4
        ports:
          - '9200:9200'
          - '9300:9300'
      kibana:
        image: kibana:4.6.1
    ...

图表：

https://github.com/spring-projects/spring-data-elasticsearch

https://www.elastic.co/support/matrix