How to check Elasticsearch cluster health?

Question

I tried to check it via

curl -XGET 'http://localhost:9200/_cluster/health' 

but nothing happened. Seems it's waiting for something. The console did not come back. Had to kill it with CTRL+C.

I also tried to check for existing indices via

curl -XGET 'http://localhost:9200/_cat/indices?v' 

Same behavior as above.

Answer 1

To check on elasticsearch cluster health you need to use

curl localhost:9200/_cat/health 

More on the cat APIs here.

I usually use elasticsearch-head plugin to visualize that.

You can find it's github project here.

It's easy to install sudo $ES_HOME/bin/plugin -i mobz/elasticsearch-head and then you can open localhost:9200/_plugin/head/ in your web brower.

You should have something that looks like this :

Answer 2

You can check elasticsearch cluster health by using (CURL) and Cluster API provieded by elasticsearch:

$ curl -XGET 'localhost:9200/_cluster/health?pretty' 

This will give you the status and other related data you need.

{  "cluster_name" : "xxxxxxxx",  "status" : "green",  "timed_out" : false,  "number_of_nodes" : 2,  "number_of_data_nodes" : 2,  "active_primary_shards" : 15,  "active_shards" : 12,  "relocating_shards" : 0,  "initializing_shards" : 0,  "unassigned_shards" : 0,  "delayed_unassigned_shards" : 0,  "number_of_pending_tasks" : 0,  "number_of_in_flight_fetch" : 0 }