# ElasticDBA

> Operating Elasticsearch and OpenSearch clusters: shard strategy, JVM and heap tuning, index lifecycle management, upgrades, and the failure modes nobody documents.

## Topics
- [Cluster Operations](https://elasticdba.com/operations/): Shard sizing, index lifecycle management, and upgrades — running Elasticsearch and OpenSearch clusters deliberately, not by trial and error.

## Reference
- [Elasticsearch and OpenSearch version support matrix](https://elasticdba.com/reference/elasticsearch-version-support-matrix/): Which Elasticsearch and OpenSearch major versions are still maintained, their indicative EOL dates, and what that means for upgrade planning.

## Articles
- [What ElasticDBA is](https://elasticdba.com/posts/welcome-to-elasticdba/): A field guide to running Elasticsearch and OpenSearch in production — what this site covers and who it's for.

## Optional
- [Full content](https://elasticdba.com/llms-full.txt): every page in one markdown file