Elasticsearch upgrade Snapshot in cluster nodes

Elastic Stack Elasticsearch
1

Hi Team,
I am trying to upgrade my 7.2 ES cluster to 7.7.1.
I have a few questions on the snapshot process.

I have a 6 node cluster - 3 Master and 3 Data Nodes.

1. How should i take snapshots?
Should i create a repo in all 6 nodes and do manual snapshots of the data sparartely?
or
Should i create a common filesystem and take a snapshot from Kibana Dev tools.

2. What are the exact steps that i need to follow in a cluster backup?
I did test upgrade steps for a single node, but on a cluster, im unsure.

Here's what i did in a single node:

  • create a repo directory
  • add path.repo in ES
  • restart es and take snapshot as per doc.
  • Flush and stop Es service
  • install 7.7.1 using rpm, upgrade
  • enable service back.

Please do help me understand the process.

Thanks

Katara.

2

The snapshot repo needs to be available to all nodes, and the snapshot itself happens at the cluster level, not the node level.

https://www.elastic.co/guide/en/elasticsearch/reference/7.9/setup-upgrade.html is the upgrade process to follow.

3

@warkolm,
Thank you for your response.

So if I create a common file system (NFS) accessible to all ,
then take snapshot via Kibana Dev tools, the cluster level snapshot will be taken.

Is my understanding right?

Katara

4

Yes, that will work.

5

Thank you very much!! @warkolm