Merge "Add docs about elasticsearch cluster"
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@ -155,3 +155,63 @@ And for Kibana:
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$ kubectl get service kibana -o yaml | awk '/nodePort: / {print $NF}'
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31426
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ElasticSearch cluster
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=====================
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Documentation above describes using elasticsearch as one node service without
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ability to scale --- stacklight doesn't require elasticsearch cluster. This one
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node elasticsearch is master-eligible, so could be scaled with any another
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master, data or client node.
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For more details about master, data and client node types please read
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`elasticsearch node documentation <https://www.elastic.co/guide/en/
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elasticsearch/reference/5.2/modules-node.html>`_.
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CCP implementation of elasticsearch cluster contains three available services:
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* ``elasticsearch`` --- master-eligible service, represents master node;
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* ``elasticsearch-data`` --- data (non-master) service, represents data node,
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contains `elasticsearch-data` volume for storing data;
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* ``elasticsearch-client`` --- special type of coordinating only node that can
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connect to multiple clusters and perform search and other operations across
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all connected clusters. Represents tribe node type.
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All these services can be scaled and deployed on several nodes with replicas -
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they will form cluster. It can be checked with command:
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::
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$ curl -X GET http://elasticsearch.ccp.svc.cluster.local:9200/_cluster/health?pretty
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which will print total number of cluster nodes and number of data nodes. More
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detailed info about each cluster node called with command:
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::
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$ curl -X GET http://elasticsearch.ccp.svc.cluster.local:9200/_cluster/state?pretty
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For example, we need elasticsearch cluster with 2 data nodes. Then, topology
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will be look like:
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::
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replicas:
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elasticsearch-data: 2
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...
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nodes:
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node1:
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roles:
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- controller
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...
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node[2-3]:
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roles:
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- es-data
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roles:
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es-data:
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- elasticsearch-data
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controller:
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- elasticsearch
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- elasticsearch-client
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...
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