02elasticsearch集群探索

这篇关于elasticsearch集群.

探索集群

elasticearch提供了标准的接口供访问。

安装很简单，先把集群跑起来：

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[jimo@jimo-pc elasticsearch-6.0.0]$ ls
bin  config  lib  LICENSE.txt  modules  NOTICE.txt  plugins  README.textile
[jimo@jimo-pc elasticsearch-6.0.0]$ bin/elasticsearch

Cluster Health

健康状态：

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[jimo@jimo-pc elasticsearch-6.0.0]$ curl http://localhost:9200/_cat/health?v
epoch      timestamp cluster       status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1512218799 20:46:39  elasticsearch green           1         1      0   0    0    0        0             0                  -                100.0%

注意的就是颜色：

  • Green - everything is good (cluster is fully functional)
  • Yellow - all data is available but some replicas are not yet allocated (cluster is fully functional)
  • Red - some data is not available for whatever reason (cluster is partially functional)

获得节点列表：

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[jimo@jimo-pc elasticsearch-6.0.0]$ curl http://localhost:9200/_cat/nodes?v
ip        heap.percent ram.percent cpu load_1m load_5m load_15m node.role master name
127.0.0.1           22          44   8    0.49    0.45     0.45 mdi       *      I9nSfCF

List All Indices

列出所有索引：

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[jimo@jimo-pc elasticsearch-6.0.0]$ curl http://localhost:9200/_cat/indices?v
health status index uuid pri rep docs.count docs.deleted store.size pri.store.size

看起来一个都没有。

Create an Index

既然没有就创建一个：采用PUT方式

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[jimo@jimo-pc elasticsearch-6.0.0]$ curl -XPUT 'localhost:9200/customer?pretty&pretty'
{
  "acknowledged" : true,
  "shards_acknowledged" : true,
  "index" : "customer"
}
# 结果
[jimo@jimo-pc elasticsearch-6.0.0]$ curl -XGET 'localhost:9200/_cat/indices?v&pretty'
health status index    uuid                   pri rep docs.count docs.deleted store.size pri.store.size
yellow open   customer AmBi42pqTlOf9UbIMgvWWw   5   1          0            0      1.1kb          1.1kb

可以看到上面pri（primary shard）和rep（replica）的默认数量。该Index还没有document关联。

Index and Query a Document

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# -d 是指定数据，下面创建了一篇ID为1的document
[jimo@jimo-pc elasticsearch-6.0.0]$ curl -XPUT 'localhost:9200/customer/doc/1?pretty&pretty' -H 'Content-Type: application/json' -d' { "name": "John Doe" } '
{
  "_index" : "customer",
  "_type" : "doc",
  "_id" : "1",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 0,
  "_primary_term" : 1
}

查询：

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[jimo@jimo-pc elasticsearch-6.0.0]$ curl -XGET 'localhost:9200/customer/doc/1?pretty&pretty'
{
  "_index" : "customer",
  "_type" : "doc",
  "_id" : "1",
  "_version" : 1,
  "found" : true,
  "_source" : {
    "name" : "John Doe"
  }
}

Delete an Index

删除索引：

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[jimo@jimo-pc elasticsearch-6.0.0]$ curl -XDELETE 'localhost:9200/customer?pretty&pretty'
{
  "acknowledged" : true
}
# 结果：
[jimo@jimo-pc elasticsearch-6.0.0]$ curl -XGET 'localhost:9200/_cat/indices?v&pretty'
health status index uuid pri rep docs.count docs.deleted store.size pri.store.size

小结

API命令的格式：

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PUT /customer
PUT /customer/doc/1
{
  "name": "John Doe"
}
GET /customer/doc/1
DELETE /customer

模式：

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<REST Verb> /<Index>/<Type>/<ID>
03-数据修改