CODEWITHSUNDEEP
elasticsearch
michael Salam
michael Salam

Reputation: 343

how to have two nodes on localhost server elasticsearch

I'm working on localhost, and in order to understand what cluster is and what a node is, i want to have two nodes on my localhost.

just to make it clear: when I lunch the elasticsearch from bin/elasticsear, i'm luching a cluster, right?

if yes, then where is the node?

and how can I have two nodes on my cluster?

update

You may ask why do I need that?

It is because, as you may know, each index in an elasticsearch cluster has shads. default is 5 shards for one index, and default is each index has 1 replica, so each index be default has 10 shards, 5 for original data, and 5 for replica. in elasticsearch, it is impossible to put the replica's shards and the original shards on the same node. thus, in my case, i have one cluster running 5 original shards for each index, but i don't have the 5 replica's shads. that's why my index status is yellow (not green, not red), i want it to be green, thus i need another node in my cluster to put the shards, but i just have one elasticsearch server (localhost), that's why i need another node on my localhost elasticsearch server

Upvotes: 0

Views: 1047

Answers (1)

Richa
Richa

Reputation: 7649

Whenever you start elasticsearch server a master node gets up by default.In order to run another node, just go to another terminal and start your elastic-search server again. Make sure that:

  • discovery.zen.ping.multicast.enabled: true in elasticsearch.yml.

Since elasticsearch is distributed in nature, the newly added instance will be automatically detected by the already existing node(s).You can verify this from the terminal.

Suppose the name of existing node was node1 and newly added node is node2.

  • On the terminal where node1 was running you will see this message:

    [node1] added [node2]

  • On the terminal where node2 has been started you will see message:

    [node2] detected_master [node1]

Both the nodes detected each other automatically. You can run following query in sense to check the nodes running:

GET /_cluster/state

This will list all the nodes

Upvotes: 0

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