ElasticSearch 7.x API查询第一节------常用cat APIs(未完待续....)

实验环境：ES集群三台（talos112、talos113、talos114）、Kibana（talos201）

软件版本：JDK 1.8、ElasticSearch 7.5.2、Kibana 7.5.2

总结说明：

1. 所有查询都支持v参数，用来返回表格的表头信息，如: GET /_cat/master?v
2. 所有查询都支持help参数，用来返回本查询支持的字段，如：GET /_cat/master?help
3. 所有查询结果默认是可读数字，如大小用mb等，这时无法排序。所以可以用bytes参数指定为b以后，对字段排序

实验步骤：

1. 查询当前的master节点(GET /_cat/master?v)

   GET /_cat/master?v
   

   id                     host            ip              node
   6ogILCk-QUOCEW0QkzvGXQ 192.168.100.112 192.168.100.112 talos-es-node1

    

2. 查询所有节点的IP、端口、节点名信息(GET /_cat/nodes?h=ip,port,heapPercent,name&v)

   GET /_cat/nodes?h=ip,port,heapPercent,name&v

   ip              port heapPercent name
   192.168.100.113 9300          14 talos-es-node2
   192.168.100.112 9300           9 talos-es-node1
   192.168.100.114 9300          15 talos-es-node3

   查询所有节点的属性信息(GET /_cat/nodeattrs?v)

   GET /_cat/nodeattrs?v

   node           host            ip              attr              value
   talos-es-node2 192.168.100.113 192.168.100.113 ml.machine_memory 1021906944
   talos-es-node2 192.168.100.113 192.168.100.113 ml.max_open_jobs  20
   talos-es-node2 192.168.100.113 192.168.100.113 xpack.installed   true
   talos-es-node1 192.168.100.112 192.168.100.112 ml.machine_memory 1021906944
   talos-es-node1 192.168.100.112 192.168.100.112 xpack.installed   true
   talos-es-node1 192.168.100.112 192.168.100.112 ml.max_open_jobs  20
   talos-es-node3 192.168.100.114 192.168.100.114 ml.machine_memory 1021906944
   talos-es-node3 192.168.100.114 192.168.100.114 ml.max_open_jobs  20
   talos-es-node3 192.168.100.114 192.168.100.114 xpack.installed   true
   

    

3. 查询所有索引信息(GET /_cat/indices?v)

   GET /_cat/indices?v

   health status index                        uuid                   pri rep docs.count docs.deleted store.size pri.store.size
   green  open   .kibana_task_manager_1       FIVIocjNRVyM5UKVR9zxpw   1   1          2            0     86.7kb         43.3kb
   green  open   kibana_sample_data_ecommerce lTEaxWGRRJmnTpNGJzQqvQ   1   1       4675            0      9.9mb            5mb
   green  open   .apm-agent-configuration     xr7eAOVaTsiiPQwNkTBcIg   1   1          0            0       566b           283b
   green  open   kibana_sample_data_logs      _5R84kkQTQKmA26JfDub2Q   1   1      14074            0     22.9mb         11.4mb
   green  open   kibana_sample_data_flights   5nsN5u7xSoWYLP15dq4eUQ   1   1      13059            0     12.8mb          6.3mb
   green  open   .kibana_1                    Hu11PqvVRmS7ODaQCClTnw   1   1        156            4      2.1mb            1mb
   

    

4. 查询所有索引信息并排序(GET /_cat/indices?bytes=b&s=stors.size:desc&v)

   GET /_cat/indices?bytes=b&s=store.size:desc&v

   health status index                        uuid                   pri rep docs.count docs.deleted store.size pri.store.size
   green  open   kibana_sample_data_logs      _5R84kkQTQKmA26JfDub2Q   1   1      14074            0   24018838       12038759
   green  open   kibana_sample_data_flights   5nsN5u7xSoWYLP15dq4eUQ   1   1      13059            0   13463951        6690300
   green  open   kibana_sample_data_ecommerce lTEaxWGRRJmnTpNGJzQqvQ   1   1       4675            0   10477642        5272162
   green  open   .kibana_1                    Hu11PqvVRmS7ODaQCClTnw   1   1        156            4    2215720        1109527
   green  open   .kibana_task_manager_1       FIVIocjNRVyM5UKVR9zxpw   1   1          2            0      88838          44419
   green  open   .apm-agent-configuration     xr7eAOVaTsiiPQwNkTBcIg   1   1          0            0        566            283
   

    

5. 查询(节点的)分片分配情况(GET /_cat/allocation?v)

   GET /_cat/allocation?v

   shards disk.indices disk.used disk.avail disk.total disk.percent host            ip              node
        4       12.5mb     2.2gb     14.7gb     16.9gb           13 192.168.100.114 192.168.100.114 talos-es-node3
        4       17.5mb     2.2gb     14.7gb     16.9gb           13 192.168.100.113 192.168.100.113 talos-es-node2
        4       17.8mb     2.5gb     14.4gb     16.9gb           14 192.168.100.112 192.168.100.112 talos-es-node1
   

6.  查询(索引的)文档总数(GET /_cat/count/?v)

   GET /_cat/count?v

   epoch      timestamp count
   1585557332 08:35:32  31874
   

   7.  查询集群尚未执行完的更改任务(pending_tasks)(GET /_cat/pending_tasks?v)

   GET /_cat/pending_tasks?v

   insertOrder timeInQueue priority source