1、_cat列入所有有效命令
GET /_cat
返回：有个猫...所以不难想象为啥是cat api
=^.^=
/_cat/allocation
/_cat/shards
/_cat/shards/{index}
/_cat/master
/_cat/nodes
/_cat/tasks
/_cat/indices
/_cat/indices/{index}
/_cat/segments
/_cat/segments/{index}
/_cat/count
/_cat/count/{index}
/_cat/recovery
/_cat/recovery/{index}
/_cat/health
/_cat/pending_tasks
/_cat/aliases
/_cat/aliases/{alias}
/_cat/thread_pool
/_cat/thread_pool/{thread_pools}
/_cat/plugins
/_cat/fielddata
/_cat/fielddata/{fields}
/_cat/nodeattrs
/_cat/repositories
/_cat/snapshots/{repository}
/_cat/templates
2、通用参数
2.1 verbose参数，显示命令详细信息
GET /_cat/master?v result: id host ip node Sa5md_zERDebxloO004ffQ 192.168.31.10 192.168.31.10 vmstation.es.1 没有加?v的情况，result： Sa5md_zERDebxloO004ffQ 192.168.31.10 192.168.31.10 vmstation.es.1
2.2 help参数，显示有效列的详细说明
GET /_cat/master?help result: id | | node id host | h | host name ip | | ip address node | n | node name
2.3 header参数，选择显示的列
GET /_cat/nodes?h=ip,port,heapPercent,name result: 192.168.31.10 9300 43 vmstation.es.1
2.4、响应体返回格式，支持json,yaml,text(default),smile,cbor
json格式
GET /_cat/indices?format=json&pretty result: [ { "health" : "green", "status" : "open", "index" : ".monitoring-kibana-6-2018.12.24", "uuid" : "vkJltBs1T8qEfdUDdyDYzA", "pri" : "1", "rep" : "0", "docs.count" : "1345", "docs.deleted" : "0", "store.size" : "453.3kb", "pri.store.size" : "453.3kb" }, { "health" : "green", "status" : "open", "index" : "user2", "uuid" : "xo9Zb2OkRWeqV5bRKNDKGg", "pri" : "1", "rep" : "0", "docs.count" : "12", "docs.deleted" : "0", "store.size" : "7.9kb", "pri.store.size" : "7.9kb" }, ..... ]
2.5、多个参数混合使用，一个问号，参数用&连接
GET /_cat/nodes?v&h=ip,port,heapPercent,name result: ip port heapPercent name 192.168.31.10 9300 59 vmstation.es.1
2.6、排序sort，缺省是asc排序
GET /_cat/indices?v&h=health,index,store.size&s=store.size:desc result: health index store.size green .monitoring-es-6-2018.12.24 10mb green .monitoring-es-6-2018.12.20 5mb green .monitoring-es-6-2018.12.25 4.4mb green .monitoring-kibana-6-2018.12.24 453.3kb green .monitoring-kibana-6-2018.12.20 318kb green .monitoring-kibana-6-2018.12.25 195.2kb yellow bus 86kb yellow blog 34.3kb green shirts 25kb yellow home 16.8kb green user 13.7kb green .kibana_1 12kb green bus2 11.6kb green user2 7.9kb green user3 261b
多个字段排序： GET /_cat/indices?v&h=health,index,store.size,pri.store.size&s=store.size:desc,pri.store.size:desc result： health index store.size pri.store.size green .monitoring-es-6-2018.12.24 10mb 10mb green .monitoring-es-6-2018.12.20 5mb 5mb green .monitoring-es-6-2018.12.25 4.6mb 4.6mb green .monitoring-kibana-6-2018.12.24 453.3kb 453.3kb green .monitoring-kibana-6-2018.12.20 318kb 318kb green .monitoring-kibana-6-2018.12.25 202.4kb 202.4kb yellow bus 86kb 86kb yellow blog 34.3kb 34.3kb green shirts 25kb 25kb yellow home 16.8kb 16.8kb green user 13.7kb 13.7kb green .kibana_1 12kb 12kb green bus2 11.6kb 11.6kb green user2 7.9kb 7.9kb green user3 261b 261b
3、aliases显示别名、过滤器、路由信息
GET /_cat/aliases?v result: alias index filter routing.index routing.search .kibana .kibana_1 - - -
4、allocation显示每个数据节点分配多少碎片以及它们使用多少磁盘空间的快照
GET /_cat/allocation?v&format=json
result：
[
{
"shards" : "20",
"disk.indices" : "21.4mb",
"disk.used" : "4gb",
"disk.avail" : "12.9gb",
"disk.total" : "16.9gb",
"disk.percent" : "23",
"host" : "192.168.31.10",
"ip" : "192.168.31.10",
"node" : "vmstation.es.1"
},
{
"shards" : "7",
"disk.indices" : null,
"disk.used" : null,
"disk.avail" : null,
"disk.total" : null,
"disk.percent" : null,
"host" : null,
"ip" : null,
"node" : "UNASSIGNED"
}
]
#7个碎片是曾经属于一个集群，现在只有单节点，但是索引建立的时候使用它作为副本，所以信息都是未知的。
5、count显示所有索引或者某个索引的文档数量
GET /_cat/count?v result: epoch timestamp count 1545709338 03:42:18 47638
或者单个索引
GET /_cat/count/bus?v result: epoch timestamp count 1545709383 03:43:03 27
6、fielddata
GET /_cat/fielddata?v result: id host ip node field size Sa5md_zERDebxloO004ffQ 192.168.31.10 192.168.31.10 vmstation.es.1 type 552b
7、indices显示每个索引的横截面。此信息跨越节点。
GET /_cat/indices?v result: health status index uuid pri rep docs.count docs.deleted store.size pri.store.size green open .monitoring-kibana-6-2018.12.24 vkJltBs1T8qEfdUDdyDYzA 1 0 1345 0 453.3kb 453.3kb green open user2 xo9Zb2OkRWeqV5bRKNDKGg 1 0 12 0 7.9kb 7.9kb yellow open bus G4DrNdPhRWK_rBuEaluwsA 3 1 27 3 86kb 86kb green open .monitoring-es-6-2018.12.25 Gl01crYyQImkxCTGvB3Xkg 1 0 16845 189 15.6mb 15.6mb green open shirts NLF5tjIuSz-JbUQcc_VbiQ 1 0 7 0 25kb 25kb green open .monitoring-kibana-6-2018.12.20 GRwFygbPRw62Qeoyg-68Mg 1 0 719 0 318kb 318kb green open .monitoring-kibana-6-2018.12.25 TmCzVC4wQrmmElX8Bbmjdg 1 0 866 0 710.2kb 710.2kb green open .monitoring-es-6-2018.12.20 IH3moZNyQfCHp8ZUjelmWA 1 0 9548 215 5mb 5mb yellow open home CSyKu2FJTZGtSIg0jOltcw 2 1 7 0 16.8kb 16.8kb green open .monitoring-es-6-2018.12.24 jCgptARpQ8S-B3Gn8adYSQ 1 0 23936 25 10mb 10mb yellow open blog G7leckf1RQGHNCZKROpBCg 2 1 33 6 34.3kb 34.3kb green open .kibana_1 olE1g78PTl-FxApa5LXhtg 1 0 3 0 12kb 12kb green open user3 -ArWuP3ZRsGsoiLwMxRyKQ 1 0 0 0 261b 261b green open bus2 j2ckAmxCRjuH6xVCU1aATA 1 0 27 0 11.6kb 11.6kb green open user WdRH_r9DSDOtySMxlRYe_g 2 0 12 0 13.7kb 13.7kb
单个索引（支持通配符）：
GET /_cat/indices/bus*?v&h=index,status,pri,rep,docs.count result: index status pri rep docs.count bus2 open 1 0 27 bus open 3 1 27
或者
GET /_cat/indices?v&index=bus*
8、master显示master节点
GET /_cat/master?v result: id host ip node Sa5md_zERDebxloO004ffQ 192.168.31.10 192.168.31.10 vmstation.es.1
9、nodeattrs显示节点属性
GET /_cat/nodeattrs?v&h=node,id,pid,host,port,attr,value result: node id pid host port attr value vmstation.es.1 Sa5m 1763 192.168.31.10 9300 ml.machine_memory 1911832576 vmstation.es.1 Sa5m 1763 192.168.31.10 9300 xpack.installed true vmstation.es.1 Sa5m 1763 192.168.31.10 9300 ml.max_open_jobs 20 vmstation.es.1 Sa5m 1763 192.168.31.10 9300 ml.enabled true
10、nodes显示集群拓扑
GET /_cat/nodes?v&format=json
result:
[
{
"ip" : "192.168.31.10",
"heap.percent" : "40",
"ram.percent" : "95",
"cpu" : "7",
"load_1m" : "0.25",
"load_5m" : "0.19",
"load_15m" : "0.13",
"node.role" : "mdi",
"master" : "*",
"name" : "vmstation.es.1"
}
]
列内容包括：
id | id,nodeId | unique node id pid | p | process id ip | i | ip address port | po | bound transport port http_address | http | bound http address version | v | es version flavor | f | es distribution flavor type | t | es distribution type build | b | es build hash jdk | j | jdk version disk.total | dt,diskTotal | total disk space disk.used | du,diskUsed | used disk space disk.avail | d,da,disk,diskAvail | available disk space disk.used_percent | dup,diskUsedPercent | used disk space percentage heap.current | hc,heapCurrent | used heap heap.percent | hp,heapPercent | used heap ratio heap.max | hm,heapMax | max configured heap ram.current | rc,ramCurrent | used machine memory ram.percent | rp,ramPercent | used machine memory ratio ram.max | rm,ramMax | total machine memory file_desc.current | fdc,fileDescriptorCurrent | used file descriptors file_desc.percent | fdp,fileDescriptorPercent | used file descriptor ratio file_desc.max | fdm,fileDescriptorMax | max file descriptors cpu | cpu | recent cpu usage load_1m | l | 1m load avg load_5m | l | 5m load avg load_15m | l | 15m load avg uptime | u | node uptime node.role | r,role,nodeRole | m:master eligible node, d:data node, i:ingest node, -:coordinating node only master | m | *:current master name | n | node name completion.size | cs,completionSize | size of completion fielddata.memory_size | fm,fielddataMemory | used fielddata cache fielddata.evictions | fe,fielddataEvictions | fielddata evictions query_cache.memory_size | qcm,queryCacheMemory | used query cache query_cache.evictions | qce,queryCacheEvictions | query cache evictions request_cache.memory_size | rcm,requestCacheMemory | used request cache request_cache.evictions | rce,requestCacheEvictions | request cache evictions request_cache.hit_count | rchc,requestCacheHitCount | request cache hit counts request_cache.miss_count | rcmc,requestCacheMissCount | request cache miss counts flush.total | ft,flushTotal | number of flushes flush.total_time | ftt,flushTotalTime | time spent in flush get.current | gc,getCurrent | number of current get ops get.time | gti,getTime | time spent in get get.total | gto,getTotal | number of get ops get.exists_time | geti,getExistsTime | time spent in successful gets get.exists_total | geto,getExistsTotal | number of successful gets get.missing_time | gmti,getMissingTime | time spent in failed gets get.missing_total | gmto,getMissingTotal | number of failed gets indexing.delete_current | idc,indexingDeleteCurrent | number of current deletions indexing.delete_time | idti,indexingDeleteTime | time spent in deletions indexing.delete_total | idto,indexingDeleteTotal | number of delete ops indexing.index_current | iic,indexingIndexCurrent | number of current indexing ops indexing.index_time | iiti,indexingIndexTime | time spent in indexing indexing.index_total | iito,indexingIndexTotal | number of indexing ops indexing.index_failed | iif,indexingIndexFailed | number of failed indexing ops merges.current | mc,mergesCurrent | number of current merges merges.current_docs | mcd,mergesCurrentDocs | number of current merging docs merges.current_size | mcs,mergesCurrentSize | size of current merges merges.total | mt,mergesTotal | number of completed merge ops merges.total_docs | mtd,mergesTotalDocs | docs merged merges.total_size | mts,mergesTotalSize | size merged merges.total_time | mtt,mergesTotalTime | time spent in merges refresh.total | rto,refreshTotal | total refreshes refresh.time | rti,refreshTime | time spent in refreshes refresh.listeners | rli,refreshListeners | number of pending refresh listeners script.compilations | scrcc,scriptCompilations | script compilations script.cache_evictions | scrce,scriptCacheEvictions | script cache evictions search.fetch_current | sfc,searchFetchCurrent | current fetch phase ops search.fetch_time | sfti,searchFetchTime | time spent in fetch phase search.fetch_total | sfto,searchFetchTotal | total fetch ops search.open_contexts | so,searchOpenContexts | open search contexts search.query_current | sqc,searchQueryCurrent | current query phase ops search.query_time | sqti,searchQueryTime | time spent in query phase search.query_total | sqto,searchQueryTotal | total query phase ops search.scroll_current | scc,searchScrollCurrent | open scroll contexts search.scroll_time | scti,searchScrollTime | time scroll contexts held open search.scroll_total | scto,searchScrollTotal | completed scroll contexts segments.count | sc,segmentsCount | number of segments segments.memory | sm,segmentsMemory | memory used by segments segments.index_writer_memory | siwm,segmentsIndexWriterMemory | memory used by index writer segments.version_map_memory | svmm,segmentsVersionMapMemory | memory used by version map segments.fixed_bitset_memory | sfbm,fixedBitsetMemory | memory used by fixed bit sets for nested object field types and type filters for types referred in _parent fields suggest.current | suc,suggestCurrent | number of current suggest ops suggest.time | suti,suggestTime | time spend in suggest suggest.total | suto,suggestTotal | number of suggest ops
选择显示内容:
GET /_cat/nodes?v&format=json&h=id,i,p,http,v,j,dt,du,hc,hp,hx,rc,rp,rm
result:
[
{
"id" : "Sa5m",
"i" : "192.168.31.10",
"p" : "1763",
"http" : "192.168.31.10:9200",
"v" : "6.5.1",
"j" : "1.8.0_172",
"dt" : "16.9gb",
"du" : "4.1gb",
"hc" : "461mb",
"hp" : "45",
"rc" : "1.6gb",
"rp" : "94",
"rm" : "1.7gb"
}
]
11、显示正在等待的任务
GET /_cat/pending_tasks?v
result:
insertOrder timeInQueue priority source
1685 855ms HIGH update-mapping [foo][t]
1686 843ms HIGH update-mapping [foo][t]
1693 753ms HIGH refresh-mapping [foo][[t]]
1688 816ms HIGH update-mapping [foo][t]
1689 802ms HIGH update-mapping [foo][t]
1690 787ms HIGH update-mapping [foo][t]
1691 773ms HIGH update-mapping [foo][t]
12、plugins显示每个运行插件节点的视图，该信息跨节点。
GET /_cat/plugins?v&s=component&h=name,component,version,description result: name component version description vmstation.es.1 analysis-ik 6.5.1 IK Analyzer for Elasticsearch
13、recovery是正在进行的和先前完成的索引碎片恢复的视图。
只要索引碎片移动到集群中的不同节点，就会发生恢复事件。这可以在快照恢复、复制级别更改、节点失败或节点启动时发生。最后一种类型称为本地存储恢复，是当节点启动时从磁盘加载碎片的正常方式。
GET /_cat/recovery?v&format=json
result：
[
{
"index" : "user2",
"shard" : "0",
"time" : "333ms",
"type" : "existing_store",
"stage" : "done",
"source_host" : "n/a",
"source_node" : "n/a",
"target_host" : "192.168.31.10",
"target_node" : "vmstation.es.1",
"repository" : "n/a",
"snapshot" : "n/a",
"files" : "0",
"files_recovered" : "0",
"files_percent" : "100.0%",
"files_total" : "4",
"bytes" : "0",
"bytes_recovered" : "0",
"bytes_percent" : "100.0%",
"bytes_total" : "8105",
"translog_ops" : "0",
"translog_ops_recovered" : "0",
"translog_ops_percent" : "100.0%"
},
{
"index" : "bus",
"shard" : "0",
"time" : "388ms",
"type" : "existing_store",
"stage" : "done",
"source_host" : "n/a",
"source_node" : "n/a",
"target_host" : "192.168.31.10",
"target_node" : "vmstation.es.1",
"repository" : "n/a",
"snapshot" : "n/a",
"files" : "0",
"files_recovered" : "0",
"files_percent" : "100.0%",
"files_total" : "28",
"bytes" : "0",
"bytes_recovered" : "0",
"bytes_percent" : "100.0%",
"bytes_total" : "21695",
"translog_ops" : "0",
"translog_ops_recovered" : "0",
"translog_ops_percent" : "100.0%"
},
... ...
]
14、thread_pool显示线程池信息
GET /_cat/thread_pool?v result: node_name name active queue rejected vmstation.es.1 analyze 0 0 0 vmstation.es.1 ccr 0 0 0 vmstation.es.1 fetch_shard_started 0 0 0 vmstation.es.1 fetch_shard_store 0 0 0 vmstation.es.1 flush 0 0 0 vmstation.es.1 force_merge 0 0 0 vmstation.es.1 generic 0 0 0 vmstation.es.1 get 0 0 0 vmstation.es.1 index 0 0 0 vmstation.es.1 listener 0 0 0 vmstation.es.1 management 1 0 0 vmstation.es.1 ml_autodetect 0 0 0 vmstation.es.1 ml_datafeed 0 0 0 vmstation.es.1 ml_utility 0 0 0 vmstation.es.1 refresh 0 0 0 vmstation.es.1 rollup_indexing 0 0 0 vmstation.es.1 search 0 0 0 vmstation.es.1 search_throttled 0 0 0 vmstation.es.1 security-token-key 0 0 0 vmstation.es.1 snapshot 0 0 0 vmstation.es.1 warmer 0 0 0 vmstation.es.1 watcher 0 0 0 vmstation.es.1 write 0 0 0
15、shards显示碎片视图
GET /_cat/shards?v&format=json
result:
[
{
"index" : "bus2",
"shard" : "0",
"prirep" : "p",
"state" : "STARTED",
"docs" : "27",
"store" : "11.6kb",
"ip" : "192.168.31.10",
"node" : "vmstation.es.1"
},
{
"index" : ".kibana_1",
"shard" : "0",
"prirep" : "p",
"state" : "STARTED",
"docs" : "3",
"store" : "12kb",
"ip" : "192.168.31.10",
"node" : "vmstation.es.1"
},
... ...
]
按索引显示：
GET /_cat/shards/bus?v result: index shard prirep state docs store ip node bus 1 p STARTED 7 27.8kb 192.168.31.10 vmstation.es.1 bus 1 r UNASSIGNED bus 2 p STARTED 9 37kb 192.168.31.10 vmstation.es.1 bus 2 r UNASSIGNED bus 0 p STARTED 11 21.1kb 192.168.31.10 vmstation.es.1 bus 0 r UNASSIGNED
16、segments显示碎片中的分段信息
GET /_cat/segments?v&format=json result: index shard prirep ip segment generation docs.count docs.deleted size size.memory committed searchable version compound
user2 0 p 192.168.31.10 _0 0 12 0 7.5kb 2726 true true 7.5.0 true
bus 0 p 192.168.31.10 _q 26 7 3 5.3kb 1982 true true 7.5.0 false
bus 0 p 192.168.31.10 _r 27 1 0 3.7kb 1827 true true 7.5.0 true
bus 0 p 192.168.31.10 _s 28 1 0 3.7kb 1827 true true 7.5.0 true
bus 0 p 192.168.31.10 _t 29 1 0 3.7kb 1827 true true 7.5.0 true
bus 0 p 192.168.31.10 _u 30 1 0 3.9kb 1965 true true 7.5.0 true
bus 1 p 192.168.31.10 _7 7 1 0 3.9kb 1829 true true 7.5.0 true
bus 1 p 192.168.31.10 _8 8 1 0 3.9kb 1829 true true 7.5.0 true
bus 1 p 192.168.31.10 _9 9 1 0 3.9kb 1829 true true 7.5.0 true
bus 1 p 192.168.31.10 _a 10 1 0 3.9kb 1829 true true 7.5.0 true
bus 1 p 192.168.31.10 _b 11 1 0 3.9kb 1829 true true 7.5.0 true
bus 1 p 192.168.31.10 _c 12 1 0 3.8kb 1829 true true 7.5.0 true
bus 1 p 192.168.31.10 _f 15 1 0 3.5kb 1538 true true 7.5.0 true
... ...