Best URL for load balancer HTTP health check


(Matt Hughes) #1

With a standard LB in front of an N-node cluster, what's the best URL in
the ES API to check the health of a particular node (so as to know to
remove it at least temporarily).

There is the node info API:

curl -XGET 'http://localhost:9200/_nodes'

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/cluster-nodes-info.html

But that's returning node info for all the nodes in the cluster that
localhost is a member of. I want something like /_nodes/_current. Or
maybe the fact that a particular node can even process any GET request
(e.g., http://localhost:9200/_cluster/health) signifies that it is
responsive enough and can take requests?

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(Mark Walkom) #2

If you just curl http://IP:9200 you will get a response, if it's not 200
then chances are it's not part of the cluster and something is wrong.

Regards,
Mark Walkom

Infrastructure Engineer
Campaign Monitor
email: markw@campaignmonitor.com
web: www.campaignmonitor.com

On 14 August 2014 07:35, Matt Hughes hughes.matt@gmail.com wrote:

With a standard LB in front of an N-node cluster, what's the best URL in
the ES API to check the health of a particular node (so as to know to
remove it at least temporarily).

There is the node info API:

curl -XGET 'http://localhost:9200/_nodes'

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/cluster-nodes-info.html

But that's returning node info for all the nodes in the cluster that
localhost is a member of. I want something like /_nodes/_current. Or
maybe the fact that a particular node can even process any GET request
(e.g., http://localhost:9200/_cluster/health) signifies that it is
responsive enough and can take requests?

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(system) #3