Es集群搭建核心思想
   1.配置相同集群名称
   2.配置不同的节点ID

   3.修改X台服务器elasticsearch.yml配置

服务器环境->准备三台服务器集群

服务器集群配置：

修改elasticsearch.yml文件

[root@chenxi elasticsearch]# vim elasticsearch.yml

---------------------------------- Cluster -----------------------------------

#

Use a descriptive name for your cluster:

取消注释，修改节点集群名称，保证三台服务器节点集群名称相同

cluster.name: chenxi

------------------------------------ Node ------------------------------------

#

Use a descriptive name for the node:

取消注释，每个节点名称不一样，其他两台为node-2, node-3

node.name: node-1

---------------------------------- Network -----------------------------------

#

Set the bind address to a specific IP (IPv4 or IPv6):

取消注释，服务器IP地址

network.host: 192.168.0.1

--------------------------------- Discovery ----------------------------------

#

Pass an initial list of hosts to perform discovery when new node is started:

The default list of hosts is ["127.0.0.1", "[::1]"]

取消注释，多个服务器集群IP

discovery.zen.ping.unicast.hosts: ["192.168.0.1","192.168.0.2","192.168.0.3"]
#

Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):

取消注释，设置最小主节点为1

discovery.zen.minimum_master_nodes: 1

关闭防火墙

注意克隆data文件会导致数据不同步
启动错误信息：
        某台集群服务器报错 failed to send join request to master 时
解决办法：
        清除每台服务器data文件

集群验证地址：
http://192.168.0.1:9200/_cat/nodes?pretty

如成功显示如下：
192.168.0.1 18 93 1 0.00 0.00 0.00 mdi * node-1
192.168.0.2 20 96 2 0.00 0.03 0.11 mdi - node-2
192.168.0.3 20 96 2 0.00 0.05 0.11 mdi - node-3