Elastic Cluster restart with one master node

Elastic Stack Elasticsearch
1

I have 6 nodes elastic cluster.
node1 - master
node2 - master
node3 - data
node4 - data
node5 - data
node6 - master, data

node1,2,3,4 and node5 are primary nodes
node6 is DR node

I want to all primary nodes and start with DR node.
I was unable to up the cluster with one node. Got error ''master not discovered or elected yet, an election requires at least 2 nodes''

is there way to up the cluster with only DR node.?

Thank You!

2

No that is not possible. A majority of master eligible nodes need to be available for the cluster to operate properly. See the docs for further details. The arrangement you are describing will therefore not work.

3

Thank You.
Then there should be (at least) 2 master nodes(live)

4

There need to be a strict majority (not fixed count) of master nodes available, e.g. 2 out of 3, 3 out of 4 etc.

5

If I want to start the elastic cluster in DR side and down all primary nodes. Then I have to setup 2 or more nodes in DR side.isn't it?

6

No, you can only add new master nodes if the cluster has an elected master, which requires a majority of master eligible nodes are available. If you want a DR cluster I would recommend setting up 2 separate clusters and either restoring a snapshot or write to both clusters in parallel.

7

is there way to setup both primary and DR nodes in the same cluster?

8

Not that I am aware of.

9

There's no notion of "primary" and "DR" nodes in Elasticsearch but this is the wrong way to think about building a resilient cluster. A properly configured cluster can carry on working even if the underlying infrastructure suffers a severe outage, possibly even losing a whole zone of its nodes all at once. The reference manual has comprehensive guidance on this subject.

10

Thank you!

11

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