# Clastic cluster unstable

**URL:** <https://discuss.elastic.co/t/clastic-cluster-unstable/290475>\
**Category:** Elasticsearch\
**Created:** [November 29, 2021, 5:45pm UTC](https://discuss.elastic.co/t/clastic-cluster-unstable/290475 "2021-11-29T17:45:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rp346](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rp346/32/53882_2.png) [@rp346](https://discuss.elastic.co/u/rp346)\
**Post date:** [November 29, 2021, 5:45pm UTC](https://discuss.elastic.co/t/clastic-cluster-unstable/290475/1 "2021-11-29T17:45:58Z")

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I have ELB stack running in kubernetes. But noticed issue with two out of 3 nodes with following error

```auto
{"type": "server", "timestamp": "2021-11-29T17:42:37,326Z", "level": "WARN", "component": "o.e.c.c.ClusterFormationFailureHelper", "cluster.name": "prod-eks-logs", "node.name": "es-master-2.elasticsearch", "message": "master not discovered or elected yet, an election requires at least 2 nodes with ids from [nnYFjBsuSN25apManWU-aA, nRV2B7R3QxWYiaXoxCMiAw, Bs1vhzBRQbyJVuv3jtWJbQ], have discovered [{es-master-2.elasticsearch}{nRV2B7R3QxWYiaXoxCMiAw}{HkGh-ZY3SmmyF-dwJaSw2g}{10.0.17.246}{10.0.17.246:9300}{cdfhilmrstw}, {es-master-0.elasticsearch}{Bs1vhzBRQbyJVuv3jtWJbQ}{RdXrp-17RrK1rQjk463wXw}{10.0.19.35}{10.0.19.35:9300}{cdfhilmrstw}, {es-master-1.elasticsearch}{nnYFjBsuSN25apManWU-aA}{9P45vPl3QBeqvIYkxxEIkw}{10.0.16.228}{10.0.16.228:9300}{cdfhilmrstw}] which is a quorum; discovery will continue using [10.0.19.35:9300, 10.0.16.228:9300] from hosts providers and [{es-master-2.elasticsearch}{nRV2B7R3QxWYiaXoxCMiAw}{HkGh-ZY3SmmyF-dwJaSw2g}{10.0.17.246}{10.0.17.246:9300}{cdfhilmrstw}] from last-known cluster state; node term 24, last-accepted version 500416 in term 24" }

```

Would like to know what is causing this and how can i prevent this in future.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 27, 2021, 5:46pm UTC](https://discuss.elastic.co/t/clastic-cluster-unstable/290475/2 "2021-12-27T17:46:32Z")

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