what do"yellow" and "red" state exactly mean in es2unix?

Question

Es2unix,one of the elasticsearch's monitor tool.There are some states while es2unix monitoring elasticsearch,such as red or yellow,to present the cluster's health.

I want to know what the exact state can be called red or yellow.Is it related to CPU used rate?or memory used rate?

PS:If you could recommend some book about elasticsearch for a newer like me,I will thank you much.

not only book,good article also ok.thanks – Mudingxi Chanshi Sep 18 '14 at 12:35 — Mudingxi Chanshi, Sep 18 '14 at 12:35
Better Explained by @javanna in the following link – Kumar Kailash Sep 19 '14 at 09:07 — Kumar Kailash, Sep 19 '14 at 09:07
thanks.It's more details. – Mudingxi Chanshi Sep 22 '14 at 07:59 — Mudingxi Chanshi, Sep 22 '14 at 07:59

score 1 · Accepted Answer · answered Sep 18 '14 at 12:46

The status red, yellow or green isn't related to the CPU or memory use, it's related to the shards and replicas allocation.

The yellow status indicates your cluster is operational (all shards are up) but the replicas are not allocated. In case of failure of one of your node, the data contained in the node's shards will be unavailable.

You will find here the (excellent) ElasticSearch Definitive Guide (along the reference documentation).

Later, you could take a look at some of the webinars and blog articles provided by the official website too.

what do"yellow" and "red" state exactly mean in es2unix?

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