# Is discourse 'stateless'?
**URL:** https://meta.discourse.org/t/is-discourse-stateless/72380
**Category:** Development
**Created:** [October 18, 2017, 11:01pm UTC](https://meta.discourse.org/t/is-discourse-stateless/72380 "2017-10-18T23:01:54Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@iamphi](https://meta.discourse.org/u/iamphi)
#### Post date: [October 18, 2017, 11:01pm UTC](https://meta.discourse.org/t/is-discourse-stateless/72380/1 "2017-10-18T23:01:54Z")
I’ve identify these 3 components for my discourse forum hosted with AWS, behind an Elastic Load Balancer.
A) web server (nginx/unicorn/RoR/redis). EC2 instance
B) file storage. S3
C) postgres db. RDS.
Is the A component stateless? Can I have many instance of A behind the ELB? Can I scale up/down A?
My immediate task is to replace the current instance with a lower tier instance. My approach is to snapshot the current instance, spin up a new lower tier instance of the snapshot, add to ELB, and remove the old instance from ELB.
But in the future can I use autoscaling with A?
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### Author:  [@zogstrip](https://meta.discourse.org/u/zogstrip)
#### Post date: [October 18, 2017, 11:06pm UTC](https://meta.discourse.org/t/is-discourse-stateless/72380/2 "2017-10-18T23:06:37Z")
Redis is not in A but in the D component.
In that case, yes, A is « stateless » 😉
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### Author:  [@iamphi](https://meta.discourse.org/u/iamphi)
#### Post date: [October 18, 2017, 11:55pm UTC](https://meta.discourse.org/t/is-discourse-stateless/72380/3 "2017-10-18T23:55:08Z")
What state does redis hold? Is it okay to ignore it briefly to do my instance replacement? Does putting the forum into readonly mode help flush/freeze redis?