Elasticsearch 常用运维命令（持续更新）

• 查看所有分片状态

GET /_cat/shards

• 查看指定索引的分片状态

GET /_cat/shards?index=***

• 对集群中分配失败的索引进行重新分配

POST /_cluster/reroute?retry_failed=true

• 查看集群状态

GET /_cluster/health

执行结果为：

{
  "cluster_name" : "docker-cluster",
  "status" : "yellow",
  "timed_out" : false,
  "number_of_nodes" : 1,
  "number_of_data_nodes" : 1,
  "active_primary_shards" : 637,
  "active_shards" : 637,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 97,
  "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" : 86.78474114441417
}

• 查看索引级状态

GET /_cluster/health?level=indices

• 查看分片级状态

GET /_cluster/health?level=shards

• 查看索引分片分配异常原因

GET _cluster/allocation/explain

执行结果为：

{
  "index" : "plume_log_run_20200922",
  "shard" : 0,
  "primary" : false,
  "current_state" : "unassigned",
  "unassigned_info" : {
    "reason" : "CLUSTER_RECOVERED",
    "at" : "2020-10-26T04:34:49.042Z",
    "last_allocation_status" : "no_attempt"
  },
  "can_allocate" : "no",
  "allocate_explanation" : "cannot allocate because allocation is not permitted to any of the nodes",
  "node_allocation_decisions" : [
    {
      "node_id" : "rUDBHtUIRZqE3NPPBZ1NRw",
      "node_name" : "es",
      "transport_address" : "172.31.0.2:9300",
      "node_attributes" : {
        "ml.machine_memory" : "25111240704",
        "xpack.installed" : "true",
        "transform.node" : "true",
        "ml.max_open_jobs" : "20"
      },
      "node_decision" : "no",
      "deciders" : [
        {
          "decider" : "same_shard",
          "decision" : "NO",
          "explanation" : "the shard cannot be allocated to the same node on which a copy of the shard already exists [[plume_log_run_20200922][0], node[rUDBHtUIRZqE3NPPBZ1NRw], [P], s[STARTED], a[id=eYEZ-ftURmeb7uunPeqpcg]]"
        }
      ]
    }
  ]
}