kuberntes上的跨簇elasticsearch

Question

我在2个不同的kubernetes VMS上有2个弹性集群，我尝试使用交叉集群进行连接。但是它不起作用，我在下面添加了详细信息，有人可以帮助我，告诉我我做错了什么或错过了什么吗？我尝试从一个弹性连接到另一个，如下所示：

GET _cluster/设置

{
  "persistent" : {
    "cluster" : {
      "remote" : {
        "cluster_three" : {
          "mode" : "proxy",
          "proxy_address" : "122.22.111.222:30005"
        },
        "cluster_two" : {
          "mode" : "sniff",
          "skip_unavailable" : "false",
          "transport" : {
            "compress" : "true"
          },
          "seeds" : [
            "122.22.222.182:30005"
          ]
        },
        "cluster_one" : {
          "seeds" : [
            "127.0.0.1:9200"
          ],
          "transport" : {
            "ping_schedule" : "30s"
          }
        }
      }
    }
  },
  "transient" : { }
      }
    }

我尝试在集群2上搜索，得到以下错误：

{"statusCode":502,"error":"Bad Gateway","message":"Client request timeout"}

但是当我在elastic to cluste_two上做curl时，我得到了这个: curl 122.22.222.182:30005

{
  "name" : "elasticsearch-client-7dcc49ddsdsd4-ljwasdpl",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "bOkaIrcFTgetsadaaY114N4a1EQ",
  "version" : {
    "number" : "7.10.2",
    "build_flavor" : "oss",
    "build_type" : "docker",
    "build_hash" : "747e1cc71def077253878a59143c1f785asdasafa92b9",
    "build_date" : "2021-01-13T00:42:12.435326Z",
    "build_snapshot" : false,
    "lucene_version" : "8.7.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"

这是我在kubernetes上为cluste_two配置的svc：

NAME                      TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
elasticsearch-client      NodePort    10.111.11.28   <none>        9200:30005/TCP   27m
elasticsearch-discovery   ClusterIP   10.111.11.11   <none>        9300/TCP         27m

Answer 1

Elasticsearch发现在端口9300而不是9200上工作，当您运行curl时，它将作为客户端请求通过端口30005。

请检查9300是否已打开以连接跨群集。当您的elasticsearch-discovery服务作为clusterIP运行时，您可能需要根据需要使用NodePort of LoadBalancer更改它的类型以暴露出K8s。

例如

# From cluster 1, we’ll define how the cluster-2 can be accessed
PUT /_cluster/settings
{
  "persistent" : {
    "cluster" : {
      "remote" : {
        "us-cluster" : {
          "seeds" : [
            "127.0.0.1:9300"
          ]
        }
      }
    }
  }
}

您还可以查看：https://www.elastic.co/blog/cross-datacenter-replication-with-elasticsearch-cross-cluster-replication