Elasticsearch 7.13 2 nodes cluster

Elastic Stack Elasticsearch
1

Hi
I have two nodes(xnode1, xnode2) cluster on elasticsearch 7.13. I made cluster succesfully, it showing 2 nodes in cluster.
For testing i stop xnode2, it showing 1 node cluster. but when stop xnode1 , then try curl with xnode2 it showing : master_not_discovered_exception.

When i stooping 2nd node xnode2 getting

[2021-06-15T07:10:31,830][WARN ][o.e.c.c.ClusterFormationFailureHelper] [xnode1] master not discovered or elected yet, an election requires a node with id [D4NWZ2baTf2hdUF6VgZ65A], have discovered [{xnode2}{Q8_O0deGQomb2mGM5KN4Ew}{3cAb9kpeS1SpCGOlN17MFQ}{192.168.10.2}{192.168.10.2:9300}{cdfhilmrstw}] which is not a quorum; discovery will continue using [192.168.10.1:9300] from hosts providers and [{vodaxsimnode1}{D4NWZ2baTf2hdUF6VgZ65A}{JdGeacDuT6Cvcl0poLgDJQ}{192.168.10.1}{192.168.10.1:9300}{cdfhilmrstw}, {xnode2}{Q8_O0deGQomb2mGM5KN4Ew}{3cAb9kpeS1SpCGOlN17MFQ}{192.168.10.22}{192.168.10.2:9300}{cdfhilmrstw}] from last-known cluster state; node term 3, last-accepted version 49 in term 3
 
 Please help me, i want make cluster with two nodes. Thanks
 
 Configuration on xnode1 :
 
 cluster.name: mucluster
 node.name: xnode1
 #network.host: 0.0.0.0
 network.host: 192.168.10.1
 http.port: 8207
 
discovery.seed_hosts : ["192.168.10.1","192.168.10.2"]
 
cluster.initial_master_nodes: ["192.168.10.1","192.168.10.2"]
#cluster.initial_master_nodes: ["xnode1","xnode2"]
 
 
 
 Configuration on xnode2 :
  
 cluster.name: mucluster
 node.name: xnode2
 #network.host: 0.0.0.0
 network.host: 192.168.10.2
 http.port: 8207
 
discovery.seed_hosts : ["192.168.10.1","192.168.10.2"]
 
cluster.initial_master_nodes: ["192.168.10.1","192.168.10.2"]
#cluster.initial_master_nodes: ["xnode1","xnode2"]
2

This older post provides more details.

Also, this part of docs may also be of benefit to understand the situation when you are down to 2 master-eligible nodes and one is removed.

3

A 2 node cluster can not be highly available and continue operating fully if one node goes down. Please read this section in the docs for further details.

4

But cluster made success and when i stop 2nd node, then cluster showing 1 node. but when i stop 1st node then , then there is no master, means in my case only first node becoming master.
in previous version i did that. please help if i have two nodes

what will my configuration for 3rd node, if going to add

5

In order to elect a master a strict majority of master eligible nodes need to be available. The majority of 2 is 2 which means a 2-node cluster can not elect a master as soon as one node is down. If you add a third node with the same main configuration you have 3 master eligible nodes in the cluster. The majority of 3 is 2 which means that even if 1 node goes offline the remaining 2 can elect a master and continue operating safely.

6

okay, but i my case only first node become master, even i stopped 2nd node first working.
[If 2nd node stopped then in cluster showing 1 node] , but when stooping 1st one this one become issue, why i can not make 2nd node master, already given in configuration.

7

I am not sure I understand. It doesn't matter which node is elected master when both nodes are available.

8

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