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[[cat-nodes]]
== Nodes
The `nodes` command shows the cluster topology.
[source,shell]
--------------------------------------------------
% curl 192.168.56.10:9200/_cat/nodes
SP4H 4727 192.168.56.30 9300 1.0.0.Beta2 1.6.0_27 72.1gb 35.4 93.9mb 79 239.1mb 0.45 3.4h d m Boneyard
_uhJ 5134 192.168.56.10 9300 1.0.0.Beta2 1.6.0_27 72.1gb 33.3 93.9mb 85 239.1mb 0.06 3.4h d * Athena
HfDp 4562 192.168.56.20 9300 1.0.0.Beta2 1.6.0_27 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.
[source,shell]
--------------------------------------------------
nodeId pid ip port es jdk
u2PZ 4234 192.168.56.30 9300 1.0.0.Beta1 1.6.0_27
URzf 5443 192.168.56.10 9300 1.0.0.Beta1 1.6.0_27
ActN 3806 192.168.56.20 9300 1.0.0.Beta1 1.6.0_27
--------------------------------------------------
The next few give a picture of your heap, memory, and load.
[source,shell]
--------------------------------------------------
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?
[source,shell]
--------------------------------------------------
uptime data/client master name
3.5h d m Boneyard
3.5h d * Athena
3.5h d m Zarek
--------------------------------------------------
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