# Elasticsearch cluster with AWS Spot Instances
**URL:** https://discuss.elastic.co/t/elasticsearch-cluster-with-aws-spot-instances/19106
**Category:** Elasticsearch
**Created:** [August 5, 2014, 10:36pm UTC](https://discuss.elastic.co/t/elasticsearch-cluster-with-aws-spot-instances/19106 "2014-08-05T22:36:17Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Felipe\_Hummel](https://discuss.elastic.co/u/Felipe_Hummel)
#### Post date: [August 5, 2014, 10:36pm UTC](https://discuss.elastic.co/t/elasticsearch-cluster-with-aws-spot-instances/19106/1 "2014-08-05T22:36:17Z")
Hey guys, I've been thinking about the idea of running a elasticsearch
cluster in AWS/EC2 mixing "normal" (on-demand or reserved) instances with
spot instances.
The motivation is simple: spot instances run just as fast as a normal
instance but with a much lower price/hour. With the "only" caveat being
that the instance can die at any moment (if the floating price goes higher
than your bid).
The idea is to have a 50/50 or 30/70 split between normal and spot
instances. For example, 4 normal instances and 8 spot instances.
My questions/doubts are:
- Has any one tried this kind of setup?
- One "safety" issue is that master/primary shards can be allocated in spot
instances which are prone to die. Anyway around this? Maybe allocate all
primaries in the "normal instances"?
- The number of spot instances can't be much higher than the number of
normal instances. That would mean that, maybe, a shard woulnd't have a
replica in at least one of the normal instances, which could be risky.
Anyway around this?
Any thoughts?
Thanks
Felipe Hummel
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 1:10am UTC](https://discuss.elastic.co/t/elasticsearch-cluster-with-aws-spot-instances/19106/2 "2017-07-06T01:10:38Z")