elasticsearch

Elasticsearch 集群管理

概述

Elasticsearch 索引管理、查询 DSL、集群运维等技能。

集群管理

集群状态

# 集群健康
curl -X GET "localhost:9200/_cluster/health?pretty"

# 集群状态
curl -X GET "localhost:9200/_cluster/state?pretty"

# 集群统计
curl -X GET "localhost:9200/_cluster/stats?pretty"

# 节点信息
curl -X GET "localhost:9200/_nodes?pretty"
curl -X GET "localhost:9200/_nodes/stats?pretty"

# 分片分配
curl -X GET "localhost:9200/_cat/shards?v"
curl -X GET "localhost:9200/_cat/allocation?v"

Cat API

# 常用 cat 命令
curl -X GET "localhost:9200/_cat/health?v"
curl -X GET "localhost:9200/_cat/nodes?v"
curl -X GET "localhost:9200/_cat/indices?v"
curl -X GET "localhost:9200/_cat/shards?v"
curl -X GET "localhost:9200/_cat/segments?v"
curl -X GET "localhost:9200/_cat/count?v"
curl -X GET "localhost:9200/_cat/recovery?v"
curl -X GET "localhost:9200/_cat/thread_pool?v"

索引管理

索引操作

# 创建索引
curl -X PUT "localhost:9200/my_index" -H 'Content-Type: application/json' -d'
{
  "settings": {
    "number_of_shards": 3,
    "number_of_replicas": 1
  },
  "mappings": {
    "properties": {
      "title": { "type": "text" },
      "content": { "type": "text" },
      "timestamp": { "type": "date" },
      "status": { "type": "keyword" }
    }
  }
}'

# 删除索引
curl -X DELETE "localhost:9200/my_index"

# 查看索引
curl -X GET "localhost:9200/my_index?pretty"
curl -X GET "localhost:9200/my_index/_mapping?pretty"
curl -X GET "localhost:9200/my_index/_settings?pretty"

# 索引别名
curl -X POST "localhost:9200/_aliases" -H 'Content-Type: application/json' -d'
{
  "actions": [
    { "add": { "index": "my_index_v2", "alias": "my_index" } },
    { "remove": { "index": "my_index_v1", "alias": "my_index" } }
  ]
}'

索引设置

# 修改设置
curl -X PUT "localhost:9200/my_index/_settings" -H 'Content-Type: application/json' -d'
{
  "index": {
    "number_of_replicas": 2
  }
}'

# 关闭/打开索引
curl -X POST "localhost:9200/my_index/_close"
curl -X POST "localhost:9200/my_index/_open"

# 刷新索引
curl -X POST "localhost:9200/my_index/_refresh"

# 强制合并
curl -X POST "localhost:9200/my_index/_forcemerge?max_num_segments=1"