All nodes green, cluster yellow (or green?)

Elastic Stack Elasticsearch
1

Hello

I'm running ElasticSearch 6.8.(mix of 8 and 10).

Kibana shows that all nodes are green, but cluster is yellow.

Graylog disagrees with Kibana - "Elasticsearch cluster is green".

What's happening, what should I fix and how do I prevent such a thing?

2

You should not run mixed version clusters as it can interfere with shard allocation. Upgrade all nodes to the same version.

3

Thank you. I thought about it, but was busy with lots of other tasks. Will try tomorrow, I was planning to upgrade anyway.

4

Right after I've upgraded a master node to 6.8.11, cluster became Green. As far as I understand the result, master should not have older version than other nodes. Others can have different patchlevel.

5

All data nodes need to have exactly the same version. It is therefore recommended to have ALL nodes on exactly the same version.

6

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