nodes 命令展示了集群拓扑结构。
% GET /_cat/nodes
192.168.56.30 9 78 22 1.80 2.05 2.51 mdi * bGG90GE
192.168.56.10 6 75 14 1.24 2.45 1.37 md - I8hydUG
192.168.56.20 5 71 12 1.07 1.05 1.11 di - H5dfFeA
前几列告诉您可用的节点并且描述了一下 heap（堆），memory（内存），cpu，和 load（平均负载）。
ip heap.percent ram.percent cpu load_1m load_5m load_15m
192.168.56.30 9 78 22 1.80 2.05 2.51
192.168.56.10 6 75 14 1.24 2.45 1.37
192.168.56.20 5 71 12 1.07 1.05 1.11
最后几列提供了在查看整个集群（特别是大集群）时的一些有用的辅助信息。我有多少个 master-eligible（master 资格的）节点。
下面是一个已存在的 header（标题）的详细列表，它可以传递 nodeattrs?h= 以在有序的列中获取更详细的信息。如果没有指定 header（标题），那么这些标记默认情况下就会有。如果指定了 header（标题），将不使用默认值。
为了更简洁，可以使用别名替换完整的标题名称。列的显示是有序的，它们在下面被列出了，除非指定了其它的顺序（例如，h=attr，value 与 h=value，attr 相反）。
在指定标题时，默认的输出中标题不会被替换。为了使标题可以出现在输出中，使用 verbose（详细的）模式（v）。标题名将匹配提供的值（例如，pid 与 p 相对）。例如 :
% curl 192.168.56.10:9200/_cat/nodes?v&h=id,ip,port,v,m
id ip port v m
pLSN 192.168.56.30 9300 {version} -
k0zy 192.168.56.10 9300 {version} -
6Tyi 192.168.56.20 9300 {version} *
% curl 192.168.56.10:9200/_cat/nodes?h=id,ip,port,v,m
pLSN 192.168.56.30 9300 {version} -
k0zy 192.168.56.10 9300 {version} -
6Tyi 192.168.56.20 9300 {version} *
| Header（标题） | Alias（别名） | Appear by Default（默认显示） | Description（描述） | Example（示例） |
|---|---|---|---|---|
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 | 5.0.1 |
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, 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 |
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 |