Server migration recommendation? 3 nodes to 4 nodes

[smlbiobot (SML)]

Hi, right now my production servers consist of 3 nodes: A, B, C. I would like to add E, D and then get rid of A. What’s the best way to achieve this?

If I simply add E, D with the existing config and then remove A from the cluster when the status is green, would that work? My hunch is that it should but I would like to verify this before I proceed.

Thanks!

[warkolm (Mark Walkom)]

@smlbiobot

If I simply add E, D with the existing config and then remove A from the cluster when the status is green, would that work? My hunch is that it should but I would like to verify this before I proceed.

It will indeed.

[smlbiobot (SML)]

Thanks — that’s handy!

When should I add the discovery.zen.minimum_master_nodes: 3 settings, which is currently set to 2? Should I add it to the 4th instance and then reboot the original 3?

[warkolm (Mark Walkom)]

Yep. You can also change it via API in the short term so you are protected along the way.