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Update docker-migrate.md

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aetter 2021-06-06 18:34:33 -07:00
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# Docker migration # Docker migration
If you use Docker images, we highly recommend that you perform what amounts to a [cluster restart upgrade](../upgrade-migrate/). Update your cluster configuration with new images, new settings, and new environment variables. Then stop and start the cluster. This process requires downtime, but takes very few steps. If you use Docker Compose, we highly recommend that you perform what amounts to a [cluster restart upgrade](../upgrade-migrate/). Update your cluster configuration with new images, new settings, and new environment variables. Then stop and start the cluster. This process requires downtime, but takes very few steps and lets you continue to treat the cluster as a single entity that you can reliably deploy and redeploy.
If you use a container orchestration system like Kubernetes and want to avoid downtime, think of the process not as an upgrade of each node, but as a decommissioning and replacement of each node. Gradually add OpenSearch nodes to the cluster while removing Elasticsearch OSS nodes. The most important step is to leave your data volumes intact. **Don't** run `docker-compose down -v`.
The most important step is to leave your data volumes intact. **Don't** run `docker-compose down -v` or any similar command. If you use a container orchestration system like Kubernetes (or manage your containers manually) and want to avoid downtime, think of the process not as an upgrade of each node, but as a decommissioning and replacement of each node. Gradually add OpenSearch nodes to the cluster while removing Elasticsearch OSS nodes.