cat nodesedit

The nodes command shows the cluster topology.

% curl 192.168.56.10:9200/_cat/nodes
SP4H 4727 192.168.56.30 9300 1.5.2 1.8.0_25 72.1gb 35.4 93.9mb 79 239.1mb 0.45 3.4h d m Boneyard
_uhJ 5134 192.168.56.10 9300 1.5.2 1.8.0_25 72.1gb 33.3 93.9mb 85 239.1mb 0.06 3.4h d * Athena
HfDp 4562 192.168.56.20 9300 1.5.2 1.8.0_25 72.2gb 74.5 93.9mb 83 239.1mb 0.12 3.4h d m Zarek

The first few columns tell you where your nodes live. For sanity it also tells you what version of ES and the JVM each one runs.

nodeId pid  ip            port version jdk
u2PZ   4234 192.168.56.30 9300 1.5.2   1.8.0_25
URzf   5443 192.168.56.10 9300 1.5.2   1.8.0_25
ActN   3806 192.168.56.20 9300 1.5.2   1.8.0_25

The next few give a picture of your heap, memory, and load.

diskAvail heapPercent heapMax ramPercent  ramMax load
   72.1gb        31.3  93.9mb         81 239.1mb 0.24
   72.1gb        19.6  93.9mb         82 239.1mb 0.05
   72.2gb        64.9  93.9mb         84 239.1mb 0.12

The last 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? How many client nodes? It looks like someone restarted a node recently; which one was it?

uptime data/client master name
  3.5h d           m      Boneyard
  3.5h d           *      Athena
  3.5h d           m      Zarek

Columnsedit

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:

% curl 192.168.56.10:9200/_cat/nodes?v&h=id,ip,port,v,m
id   ip            port version m
pLSN 192.168.56.30 9300 1.5.2   m
k0zy 192.168.56.10 9300 1.5.2   m
6Tyi 192.168.56.20 9300 1.5.2   *
% curl 192.168.56.10:9200/_cat/nodes?h=id,ip,port,v,m
pLSN 192.168.56.30 9300 1.5.2 m
k0zy 192.168.56.10 9300 1.5.2 m
6Tyi 192.168.56.20 9300 1.5.2 *
HeaderAliasAppear by DefaultDescriptionExample

id

nodeId

No

Unique node ID

k0zy

pid

p

No

Process ID

13061

host

h

Yes

Host name

n1

ip

i

Yes

IP address

127.0.1.1

port

po

No

Bound transport port

9300

version

v

No

Elasticsearch version

1.5.2

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

load

l

No

Most recent load average

0.22

uptime

u

No

Node uptime

17.3m

node.role

r, role, dc, nodeRole

Yes

Data node (d); Client node (c)

d

master

m

Yes

Current master (*); master eligible (m)

m

name

n

Yes

Node name

Venom

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

filter_cache.memory_size

fcm, filterCacheMemory

No

Used filter cache memory

0b

filter_cache.evictions

fce, filterCacheEvictions

No

Filter cache evictions

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

id_cache.memory_size

im, idCacheMemory

No

Used ID cache memory

216b

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

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

percolate.current

pc, percolateCurrent

No

Number of current percolations

0

percolate.memory_size

pm, percolateMemory

No

Memory used by current percolations

0b

percolate.queries

pq, percolateQueries

No

Number of registered percolation queries

0

percolate.time

pti, percolateTime

No

Time spent percolating

0s

percolate.total

pto, percolateTotal

No

Total percolations

0

refresh.total

rto, refreshTotal

No

Number of refreshes

16

refresh.time

rti, refreshTime

No

Time spent in refreshes

91ms

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, searchFetchCurrent

No

Current query phase operations

0

search.query_time

sqti, searchFetchTime

No

Time spent in query phase

43ms

search.query_total

sqto, searchFetchTotal

No

Number of query operations

9

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.index_writer_max_memory

siwmx, segmentsIndexWriterMaxMemory

No

Maximum memory index writer may use before it must write buffered documents to a new segment

32mb

segments.version_map_memory

svmm, segmentsVersionMapMemory

No

Memory used by version map

1.0kb