es-集群扩展节点

以下为es7.2.0版本

原集群：（现增加两个节点node_76和node_211）
1、老节点: 下载配置文件elasticsearch.ym、下载秘钥文件elastic-certificates.p12(无密码可以不用)、查看对应版本、查看node节点和集群状态
[root@elastic20 config]# curl -u elastic:test_elastic 16.168.139.20:9200/_cat/nodes
16.168.139.116 73 99 1 0.09 0.17 0.16 mdi * node_116
16.168.139.20  33 99 0 0.16 0.07 0.06 mdi - node_20
16.168.139.45  46 99 1 0.26 0.16 0.09 mdi - node_45

2、----安装同版本es----
新节点：
优化文件描述符、安装jdk、安装同版本es、创建es账号、上传配置文件、秘钥文件，
修改配置文件中（node名、本机ip、发现ip、可成为主节点ip）启动服务、加入开机启动

安装具体参考：https://www.jianshu.com/p/d584579df340

配置文件elasticsearch.yml：(我的文件是复制老节点来的，只修改node.name、network.host、cluster.initial_master_nodes、 discovery.seed_hosts)
带认证的需要拷贝：elastic-certificates.p12这个文件到新节点（和老节点位置一样就行）
# ======================== Elasticsearch Configuration =========================
 cluster.name: cluster-Es
 node.name: node_76
 network.host: 16.168.139.76
 node.master: true
 node.data: true
 # head 插件需要这打开这两个配置
 http.cors.allow-origin: "*"
 http.cors.enabled: true
 http.max_content_length: 200mb
 # 可以选举的主节点
 cluster.initial_master_nodes: ["16.168.139.20:9300","16.168.139.45:9300","16.168.139.116:9300","16.168.139.211:9300","16.168.139.76:9300"]
 discovery.seed_hosts: ["16.168.139.20:9300","16.168.139.45:9300","16.168.139.116:9300","16.168.139.211:9300","16.168.139.76:9300"]
 gateway.recover_after_nodes: 2
 network.tcp.keep_alive: true
 network.tcp.no_delay: true
 transport.tcp.compress: true
 #集群内同时启动的数据任务个数，默认是2个
 cluster.routing.allocation.cluster_concurrent_rebalance: 16
 #添加或删除节点及负载均衡时并发恢复的线程个数，默认4个
 cluster.routing.allocation.node_concurrent_recoveries: 16
 #初始化数据恢复时，并发恢复线程的个数，默认4个
 cluster.routing.allocation.node_initial_primaries_recoveries: 16
 #开启 xpack 功能，如果要禁止使用密码，请将以下内容注释，直接启动不需要设置密码
 xpack.security.enabled: true
 xpack.security.transport.ssl.enabled: true
 xpack.security.transport.ssl.verification_mode: certificate
 xpack.security.transport.ssl.keystore.path: elastic-certificates.p12
 xpack.security.transport.ssl.truststore.path: elastic-certificates.p12

完成以上步骤后可以查看下nodes和集群状态；
[root@sxsyjj-ymzs-db-07 data]# curl -u elastic:test_elastic 16.168.139.76:9200/_cat/nodes
16.168.139.76   8 99 10 0.80 0.77 0.40 mdi - node_76
16.168.139.45  54 99  9 0.63 0.44 0.31 mdi - node_45
16.168.139.20  37 93  2 0.66 0.28 0.14 mdi - node_20
16.168.139.211 54 99  7 0.16 0.14 0.09 mdi - node_211
16.168.139.116 37 99  5 0.15 0.22 0.17 mdi * node_116
[root@sxsyjj-ymzs-db-07 ~]# curl -u elastic:test_elastic 16.168.139.76:9200/_cluster/health?pretty
{
  "cluster_name" : "cluster-Es",
  "status" : "green",
  "timed_out" : false,
  "number_of_nodes" : 5,
  "number_of_data_nodes" : 5,
  "active_primary_shards" : 581,
  "active_shards" : 640,
  "relocating_shards" : 7,
  "initializing_shards" : 0,
  "unassigned_shards" : 0,
  "delayed_unassigned_shards" : 0,
  "number_of_pending_tasks" : 0,
  "number_of_in_flight_fetch" : 0,
  "task_max_waiting_in_queue_millis" : 0,
  "active_shards_percent_as_number" : 100.0
}
[root@sxsyjj-ymzs-db-07 ~]# 

3、老节点--配置文件中以下两项修改为和新节点一样，不用重启（防止下次重启时报警或故障）
 cluster.initial_master_nodes: ["16.168.139.20:9300","16.168.139.45:9300","16.168.139.116:9300","16.168.139.211:9300","16.168.139.76:9300"]
 discovery.seed_hosts: ["16.168.139.20:9300","16.168.139.45:9300","16.168.139.116:9300","16.168.139.211:9300","16.168.139.76:9300"]

参考：
https://blog.csdn.net/yabingshi_tech/article/details/120909507