这两道题目非常具有代表性，分别是跨集群复制和跨集群检索，需要相应的 许可 这里在虚拟机上搭建集群完成这两道题目，这里补充一下 elasticsearch 和 kibana 的配置文件

# elasticsearch.yml
cluster.name: cluster2
node.name: cluster2-node
path.data: /home/jie/es8/cluster2/data
path.logs: /home/jie/es8/cluster2/logs
bootstrap.memory_lock: true
network.host: 192.168.78.10
http.port: 9202
transport.port: 9302
discovery.seed_hosts: ["cluster2-node"]
cluster.initial_master_nodes: ["cluster2-node"]
xpack.security.enabled: false

# jvm.options
-Xms1g
-Xmx1g

# kibana.yml
server.port: 5603
server.host: "0.0.0.0"
elasticsearch.hosts: ["http://192.168.78.10:9202"]

一、题目

跨集群查询

# 向 cluster_one 写入数据
POST test/_bulk
{"index": {}}
{"cluster_name": "cluster_one"}

# 向 cluster_two写入数据
POST test/_bulk
{"index": {}}
{"cluster_name": "cluster_two"}

1.1 考点

1. 跨集群查询配置
2. 跨集群查询检索
3. 节点角色

这里需要注意的是节点角色需要有 remote_cluster_client 角色

1.2 答案

# 建立远程连接
PUT _cluster/settings
{
  "persistent": {
    "cluster": {
      "remote": {
        "cluster_one": {
          "seeds": [
            "192.168.78.10:9301"
          ]
        },
        "cluster_two": {
          "seeds": [
            "192.168.78.10:9302"
          ]
        }
      }
    }
  }
}

# 查看远程连接信息
GET _remote/info

# 搜索 cluster_one 和 cluster_two 集群的 test 索引
POST cluster_one:test,cluster_two:test/_search

二、题目

跨集群复制

2.1 考点

1. 许可证适用：Stack Management -> License Management -> Start a 30-day trial
2. 跨集群复制

2.2 答案

创建远程连接集群

PUT _cluster/settings
{
  "persistent": {
    "cluster": {
      "remote": {
        "cluster_one": {
          "seeds": [
            "192.168.78.10:9301"
          ]
        },
        "cluster_two": {
          "seeds": [
            "192.168.78.10:9302"
          ]
        }
      }
    }
  }
}

创建主从索引的过程整体是通过 kibana 操作完成的
Stack Management -> Cross-Cluster Replication -> Create a follower index

最后要记得启动