ElasticSearch 7.x API查詢第一節------常用cat APIs(未完待續....)

實驗環境：ES集羣三臺（talos112、talos113、talos114）、Kibana（talos201）

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

總結說明：

1. 所有查詢都支持v參數，用來返回表格的表頭信息，如: GET /_cat/master?v
2. 所有查詢都支持help參數，用來返回本查詢支持的字段，如：GET /_cat/master?help
3. 所有查詢結果默認是可讀數字，如大小用mb等，這時無法排序。所以可以用bytes參數指定爲b以後，對字段排序

實驗步驟：

1. 查詢當前的master節點(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. 查詢所有節點的IP、端口、節點名信息(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

   查詢所有節點的屬性信息(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. 查詢所有索引信息(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. 查詢所有索引信息並排序(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. 查詢(節點的)分片分配情況(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.  查詢(索引的)文檔總數(GET /_cat/count/<index>?v)

   GET /_cat/count?v

   epoch      timestamp count
   1585557332 08:35:32  31874
   

   7.  查詢集羣尚未執行完的更改任務(pending_tasks)(GET /_cat/pending_tasks?v)

   GET /_cat/pending_tasks?v

   insertOrder timeInQueue priority source