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Opensearch – best way to stop the node for maintenance break

Solved1.23K views29th January 2024opensearch
3
Piotr Borowski [DevOps Member]550 9th November 2023 0 Comments

Hi,

Could you please write me what is the safe procedure for temporarily shutting down one OpenSearch node in the cluster because of maintenance works ( like updating java etc.) - lest assume example 30 minutes break.

Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 29th January 2024

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Piotr Borowski [DevOps Member]550 Posted 15th November 2023 0 Comments

1. Disable shard allocation (before shutting down data nodes).

PUT _cluster/settings
{
"persistent": {
"cluster.routing.allocation.enable": "primaries"
}
}

2. Stop non-essential indexing and perform a flush (optional).

POST /_flush

3. Disable a single node.

• If Elasticsearch is running with systemd (currently in the lab):

sudo systemctl stop opensearch

4. Make any necessary changes.

5. Restart the modified node.

sudo systemctl start opensearch

GET _cat/nodes

6. Re-enable shard allocation.

PUT _cluster/settings
{
"persistent": {
"cluster.routing.allocation.enable": null
}
}

Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 29th January 2024
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