Hot/Warm Architecture - Two nodes on the same server

Elastic Stack Elasticsearch
1

Hi there,

Is it technically possible to run multiple elasticsearch nodes on the same physical server? For example in a Hot/Warm architecture could we fill a chassis with half SSD's and half HDD's and run a Hot node and Warm node side-by-side? Then scale the cluster horizontally adding new servers with a Hot and Warm node on each?

Is this recommended? What would be the drawbacks apart from the obvious sharing of hardware resource and high availability if a server dies? Has anyone out there attempted this or something similar before?

Thanks
Steve

2

Yes, it's technically possible, and people do do this. The main drawbacks are as you describe. You should set cluster.routing.allocation.same_shard.host to true to avoid having two copies of the same shard on the same host.

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