Node is not added to the cluster

Elastic Stack Elasticsearch
1

I created a cluster for five nodes. However, one of the nodes does not see the rest and creates a cluster where this node is the only participant. I do everything in the same way on all nodes. Here is its config:

cluster.name: lynx
node.name: poi-1
node.master: true
node.data: true
network.bind_host: 0.0.0.0
network.host: 10.10.10.13
http.port: 9200
discovery.zen.ping.unicast.hosts: [“10.10.10.11”, “10.10.10.12”, “10.10.10.13”, “10.10.10.14”, “10.10.10.15”]

ps: I already had a cluster with this name on these nodes, I parsed it, there were reasons for this.

Please tell me how can I fix this?

2

Glad that I could help! :grinning:

1 Like
3

At the moment, you have provided moral support image
But the problem with the cluster persists)

4

It looks like you are running an older version of Elasticsearch (up to 6.x). If all your nodes are master eligible you need to set minimum_master_nodes to 3 in order to avoid split-brain scenarios and multiple separate clusters forming.

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5

Yes, that's what I did - I only use three nodes as a master. And all five nodes as a "node.data".

For my problem, maybe I need to clear the old cluster data? I just don’t know how to do it. On other servers there was the same problem, each of them saw only himself in a cluster, I ran this command: curl -XDELETE localhost:9200/_all (the current data is not very important to me, this is a test cluster) And after that four nodes gathered into a cluster, all but one.

6

If you have 3 master eligible node you must set minimum_master_nodes to 2 unless you are using Elasticsearch 7.x. I do not see this set in your config above.

1 Like
7

Thank you very much! I read about discovery.zen.minimum_master_nodes - this is a really important parameter for cluster integrity!

8

Thank you very much again! I did it!

9

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