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cat nodes

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cat nodes

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The nodes command shows the cluster topology. For example

GET /_cat/nodes?v

Might look like:

ip        heap.percent ram.percent cpu load_1m load_5m load_15m node.role master name
127.0.0.1           65          99  42    3.07                  mdi       *      mJw06l1

The first few columns (ip, heap.percent, ram.percent, cpu, load_*) tell you where your nodes live and give a quick picture of performance stats.

The last (node.role, master, and name) columns provide ancillary information that can often be useful when looking at the cluster as a whole, particularly large ones. How many master-eligible nodes do I have?

Columns

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Below is an exhaustive list of the existing headers that can be passed to nodes?h= to retrieve the relevant details in ordered columns. If no headers are specified, then those marked to Appear by Default will appear. If any header is specified, then the defaults are not used.

Aliases can be used in place of the full header name for brevity. Columns appear in the order that they are listed below unless a different order is specified (e.g., h=pid,id versus h=id,pid).

When specifying headers, the headers are not placed in the output by default. To have the headers appear in the output, use verbose mode (v). The header name will match the supplied value (e.g., pid versus p). For example:

GET /_cat/nodes?v&h=id,ip,port,v,m

Might look like:

id   ip        port  v         m
veJR 127.0.0.1 59938 5.2.2 *

Header	Alias	Appear by Default	Description	Example
`id`	`nodeId`	No	Unique node ID	k0zy
`pid`	`p`	No	Process ID	13061
`ip`	`i`	Yes	IP address	127.0.1.1
`port`	`po`	No	Bound transport port	9300
`http_address`	`http`	No	Bound http address	127.0.0.1:9200
`version`	`v`	No	Elasticsearch version	5.2.2
`build`	`b`	No	Elasticsearch Build hash	5c03844
`jdk`	`j`	No	Running Java version	1.8.0
`disk.avail`	`d`, `disk`, `diskAvail`	No	Available disk space	1.8gb
`heap.current`	`hc`, `heapCurrent`	No	Used heap	311.2mb
`heap.percent`	`hp`, `heapPercent`	Yes	Used heap percentage	7
`heap.max`	`hm`, `heapMax`	No	Maximum configured heap	1015.6mb
`ram.current`	`rc`, `ramCurrent`	No	Used total memory	513.4mb
`ram.percent`	`rp`, `ramPercent`	Yes	Used total memory percentage	47
`ram.max`	`rm`, `ramMax`	No	Total memory	2.9gb
`file_desc.current`	`fdc`, `fileDescriptorCurrent`	No	Used file descriptors	123
`file_desc.percent`	`fdp`, `fileDescriptorPercent`	Yes	Used file descriptors percentage	1
`file_desc.max`	`fdm`, `fileDescriptorMax`	No	Maximum number of file descriptors	1024
`cpu`		No	Recent system CPU usage as percent	12
`load_1m`	`l`	No	Most recent load average	0.22
`load_5m`	`l`	No	Load average for the last five minutes	0.78
`load_15m`	`l`	No	Load average for the last fifteen minutes	1.24
`uptime`	`u`	No	Node uptime	17.3m
`node.role`	`r`, `role`, `nodeRole`	Yes	Master eligible node (m); Data node (d); Ingest node (i); Coordinating node only (-)	mdi
`master`	`m`	Yes	Elected master (*); Not elected master (-)	*
`name`	`n`	Yes	Node name	I8hydUG
`completion.size`	`cs`, `completionSize`	No	Size of completion	0b
`fielddata.memory_size`	`fm`, `fielddataMemory`	No	Used fielddata cache memory	0b
`fielddata.evictions`	`fe`, `fielddataEvictions`	No	Fielddata cache evictions	0
`query_cache.memory_size`	`qcm`, `queryCacheMemory`	No	Used query cache memory	0b
`query_cache.evictions`	`qce`, `queryCacheEvictions`	No	Query cache evictions	0
`request_cache.memory_size`	`rcm`, `requestCacheMemory`	No	Used request cache memory	0b
`request_cache.evictions`	`rce`, `requestCacheEvictions`	No	Request cache evictions	0
`request_cache.hit_count`	`rchc`, `requestCacheHitCount`	No	Request cache hit count	0
`request_cache.miss_count`	`rcmc`, `requestCacheMissCount`	No	Request cache miss count	0
`flush.total`	`ft`, `flushTotal`	No	Number of flushes	1
`flush.total_time`	`ftt`, `flushTotalTime`	No	Time spent in flush	1
`get.current`	`gc`, `getCurrent`	No	Number of current get operations	0
`get.time`	`gti`, `getTime`	No	Time spent in get	14ms
`get.total`	`gto`, `getTotal`	No	Number of get operations	2
`get.exists_time`	`geti`, `getExistsTime`	No	Time spent in successful gets	14ms
`get.exists_total`	`geto`, `getExistsTotal`	No	Number of successful get operations	2
`get.missing_time`	`gmti`, `getMissingTime`	No	Time spent in failed gets	0s
`get.missing_total`	`gmto`, `getMissingTotal`	No	Number of failed get operations	1
`indexing.delete_current`	`idc`, `indexingDeleteCurrent`	No	Number of current deletion operations	0
`indexing.delete_time`	`idti`, `indexingDeleteTime`	No	Time spent in deletions	2ms
`indexing.delete_total`	`idto`, `indexingDeleteTotal`	No	Number of deletion operations	2
`indexing.index_current`	`iic`, `indexingIndexCurrent`	No	Number of current indexing operations	0
`indexing.index_time`	`iiti`, `indexingIndexTime`	No	Time spent in indexing	134ms
`indexing.index_total`	`iito`, `indexingIndexTotal`	No	Number of indexing operations	1
`indexing.index_failed`	`iif`, `indexingIndexFailed`	No	Number of failed indexing operations	0
`merges.current`	`mc`, `mergesCurrent`	No	Number of current merge operations	0
`merges.current_docs`	`mcd`, `mergesCurrentDocs`	No	Number of current merging documents	0
`merges.current_size`	`mcs`, `mergesCurrentSize`	No	Size of current merges	0b
`merges.total`	`mt`, `mergesTotal`	No	Number of completed merge operations	0
`merges.total_docs`	`mtd`, `mergesTotalDocs`	No	Number of merged documents	0
`merges.total_size`	`mts`, `mergesTotalSize`	No	Size of current merges	0b
`merges.total_time`	`mtt`, `mergesTotalTime`	No	Time spent merging documents	0s
`refresh.total`	`rto`, `refreshTotal`	No	Number of refreshes	16
`refresh.time`	`rti`, `refreshTime`	No	Time spent in refreshes	91ms
`script.compilations`	`scrcc`, `scriptCompilations`	No	Total script compilations	17
`script.cache_evictions`	`scrce`, `scriptCacheEvictions`	No	Total compiled scripts evicted from cache	6
`search.fetch_current`	`sfc`, `searchFetchCurrent`	No	Current fetch phase operations	0
`search.fetch_time`	`sfti`, `searchFetchTime`	No	Time spent in fetch phase	37ms
`search.fetch_total`	`sfto`, `searchFetchTotal`	No	Number of fetch operations	7
`search.open_contexts`	`so`, `searchOpenContexts`	No	Open search contexts	0
`search.query_current`	`sqc`, `searchQueryCurrent`	No	Current query phase operations	0
`search.query_time`	`sqti`, `searchQueryTime`	No	Time spent in query phase	43ms
`search.query_total`	`sqto`, `searchQueryTotal`	No	Number of query operations	9
`search.scroll_current`	`scc`, `searchScrollCurrent`	No	Open scroll contexts	2
`search.scroll_time`	`scti`, `searchScrollTime`	No	Time scroll contexts held open	2m
`search.scroll_total`	`scto`, `searchScrollTotal`	No	Completed scroll contexts	1
`segments.count`	`sc`, `segmentsCount`	No	Number of segments	4
`segments.memory`	`sm`, `segmentsMemory`	No	Memory used by segments	1.4kb
`segments.index_writer_memory`	`siwm`, `segmentsIndexWriterMemory`	No	Memory used by index writer	18mb
`segments.version_map_memory`	`svmm`, `segmentsVersionMapMemory`	No	Memory used by version map	1.0kb
`segments.fixed_bitset_memory`	`sfbm`, `fixedBitsetMemory`	No	Memory used by fixed bit sets for nested object field types and type filters for types referred in _parent fields	1.0kb
`suggest.current`	`suc`, `suggestCurrent`	No	Number of current suggest operations	0
`suggest.time`	`suti`, `suggestTime`	No	Time spent in suggest	0
`suggest.total`	`suto`, `suggestTotal`	No	Number of suggest operations	0

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