安全的移除Es数据节点步骤

说明：想要安全的移除一个es节点，不改变分片的数量，100%不会引起数据丢失，即保证这个节点的所有数据被其他节点接收。然后停止这个节点的实例。

两个节点禁用策略：

代码语言：javascript复制

curl -XPUT http://0.0.0.0:9200/_cluster/settings?pretty -d '{"transient":{"cluster.routing.allocation.exclude._ip":"10.10.10.11,10.10.10.12"}}'

Data-node节点下线过程：

• 步骤1：将节点从集群路由策略中排除

代码语言：javascript复制

curl -XPUT http://0.0.0.0:9200/_cluster/settings?pretty -d '{"transient":{"cluster.routing.allocation.exclude._ip":"10.10.10.11"}}'

PUT _cluster/settings
{
  "transient": {
    "cluster.routing.allocation.exclude._ip": "10.1.22.129"
  }
}

执行结果：
{
  "acknowledged" : true,
  "persistent" : { },
  "transient" : {
    "cluster" : {
      "routing" : {
        "allocation" : {
          "exclude" : {
            "_ip" : "10.1.22.129"
          }
        }
      }
    }
  }
}

• 步骤2：等待节点上分片全部被迁移

代码语言：javascript复制

curl http://0.0.0.0:9200/_cluster/health?pretty
curl http://0.0.0.0:9200/_cluster/pending_tasks?pretty
curl http://0.0.0.0:9200/_cluster/allocation/explain?pretty

1.检查集群状态
http://10.1.34.146:9200/_cluster/health?pretty
{
   cluster_name: "my-es6-test",
   status: "green",
   timed_out: false,
   number_of_nodes: 4,
   number_of_data_nodes: 4,
   active_primary_shards: 150,
   active_shards: 272,
   relocating_shards: 0,
   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
}

2.若出现pening_tasks，当pending_tasks的等级>=HIGH时，存在集群无法新建索引的风险
http://10.1.34.146:9200/_cluster/pending_tasks?pretty
{
  "tasks": []
}

3.若集群中出现UNASSIGNED shards,检查原因，查看是否是分配策略导致无法迁移分片
http://10.1.22.129:9200/_cluster/allocation/explain?pretty

4.查看节点数据是否已迁移，都是 0 表示数据也已经迁移
http://10.1.34.146:9200/_nodes/{node-6}/stats/indices?pretty
{
   _nodes: {
       total: 0,
       successful: 0,
       failed: 0
   },
   cluster_name: "my-es6-test",
   nodes: { }
}

• 步骤3：下线节点

代码语言：javascript复制

[localhost~]$ ps aux | grep Elasticsearch
[localhost~]$ ps -ef | grep Elasticsearch

kill -9 {pid}

• 步骤4：取消节点禁用策略

代码语言：javascript复制

curl -XPUT http://0.0.0.0:9200/_cluster/settings?pretty -d '{"transient":{"cluster.routing.allocation.exclude._ip": null}}'

PUT _cluster/settings
{
  "transient": {
    "cluster.routing.allocation.exclude._ip": null
  }
}

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