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Elasticsearch提供了一个非常全面和强大的REST API,您可以使用与您的集群进行交互。为数不多的可以用API的事情如下:- 检查您的集群、节点和索引健康状态和统计数据
- 管理集群、节点和索引数据和元数据
- 执行CRUD(创建、读取、更新和删除)索引和搜索操作
- 执行高级搜索操作,比如分页、排序、过滤、脚本、聚合,和许多其他人
1. 可以使用 _cat API查看elasticsearch的健康状况,但是启动时不能以守护进程方式启动。
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| [iyunv@Server01 ~]# curl '127.0.0.1:9200/_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
1463648421 17:00:21 elasticsearch green 1 1 0 0 0 0 0 0 - 100.0%
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健康状态有三个状态:
- Green:集群一切正常
- Yellow:数据可用,副本不可用
- Red:部分数据不可用,也可能有部分数据能用。
2. 查看节点列表
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| [iyunv@Server01 ~]# curl '127.0.0.1:9200/_cat/nodes?v'
host ip heap.percent ram.percent load node.role master name
127.0.0.1 127.0.0.1 2 43 0.00 d * Analyzer
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3. 查看索引
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| [iyunv@Server01 ~]# curl '127.0.0.1:9200/_cat/indices?v'
health status index pri rep docs.count docs.deleted store.size pri.store.size
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没有任何索引
4. 创建“customer”并查看索引
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| [iyunv@Server01 ~]# curl -XPUT '127.0.0.1:9200/customer?pretty'
{
"acknowledged" : true
}
[iyunv@Server01 ~]# curl '127.0.0.1:9200/_cat/indices?v'
health status index pri rep docs.count docs.deleted store.size pri.store.size
yellow open customer 5 1 0 0 260b 260b
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yellow 正如前面所说的副本不可用,有5个分片和1个副本(默认值),它包含0文件。
5. 添加索引文档
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| [iyunv@Server01 ~]# curl -XPUT '127.0.0.1:9200/customer/external/1?retty' -d '{"name":"Little Boy"}'
{"_index":"customer","_type":"external","_id":"1","_version":1,"_shards":{"total":2,"successful":1,"failed":0},"created":true}
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6. 查询文档
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| [iyunv@Server01 ~]# curl -XGET '127.0.0.1:9200/customer/external/1?pretty'
{
"_index" : "customer",
"_type" : "external",
"_id" : "1",
"_version" : 1,
"found" : true,
"_source" : {
"name" : "Little Boy"
}
}
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6.删除索引
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| [iyunv@Server01 ~]# curl -XDELETE '127.0.0.1:9200/customer?pretty'
{
"acknowledged" : true
}
[iyunv@Server05 ~]# curl '127.0.0.1:9200/_cat/indices?v'
health status index pri rep docs.count docs.deleted store.size pri.store.size
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以上就是Elasticsearch在集群方面常用的API,借助这些API,我们可以很快的查询服务器的状态,发现服务器的运行问题。
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