Help Request - Nodes aren't showing up in cluster formation

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I’m trying to stand up a new OpenSearch instance using the RPM install method. I’m on Step 5 of the cluster formation documentation. When I execute the suggested _cat query:

curl -XGET https://<private-ip>:9200/_cat/nodes?v -u 'admin:admin' --insecure

I only see three of my twelve data nodes.

How do I troubleshoot this? Being new to OpenSearch in general, I’m unsure how to proceed.

2

I’ve solved this particular issue. Some of the data nodes had incorrect cluster UUIDs, so deleting the nodes’ data folders and letting them regenerate fixed the issue.

I found the issue by checking /var/log/opensearch/clusterName.log on one of the master nodes, and solved it with some help from here.

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