pooling instances to shared VMs #322

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opened 2025-04-28 12:36:01 +02:00 by kiara · 0 comments

kiara commented

2025-04-28 12:36:01 +02:00

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As a host,
I want to pool Fediversity instances to shared VMs,
so that usage spikes are ameliorated granting users a smoother experience.

implementation notes

ways to achieve this include:

pooling a user's services into VMs shared across their resources (c.f. #339, #341)
pooling a service across different users into a shared VM
- note this comes with security concerns
- performance gains may particularly impact applications prone to resource usage spikes
- user-level CRUD likely involves LDAP or Terraform more broadly (in our Nix context possibly using declarative-runtime - vault, postgresql, ldap, applications...)
- may involve use of SRV records
  - more on this at vanrein/architecture#1
- challenge: what does this mean for migration (#100) when hosting providers have a shared single instance differing in version?
  - potentially address by initially making a separate instance of the desired version for this, perhaps with the intent to eventually reconcile this into the shared one
~~this may be addressed for now by #327~~

**As** a host, **I want** to pool Fediversity instances to shared VMs, **so that** usage spikes are ameliorated granting users a smoother experience. ## implementation notes ways to achieve this include: - pooling a user's services into VMs shared across their resources (c.f. #339, #341) - pooling a service across different users into a shared VM - note this comes with security concerns - performance gains may particularly impact applications prone to resource usage spikes - user-level CRUD likely involves LDAP or Terraform more broadly (in our Nix context possibly using [declarative-runtime](https://github.com/applicative-systems/declarative-runtime) - [vault](https://registry.terraform.io/providers/hashicorp/vault/latest/docs), [postgresql](https://registry.terraform.io/providers/cyrilgdn/postgresql/latest/docs), [ldap](https://registry.terraform.io/providers/Ouest-France/ldap/latest/docs), applications...) - may involve use of SRV records - more on this at https://git.fediversity.eu/vanrein/architecture/issues/1 - challenge: what does this mean for migration (#100) when hosting providers have a shared single instance differing in version? - potentially address by initially making a separate instance of the desired version for this, perhaps with the intent to eventually reconcile this into the shared one - ~~this may be addressed for now by #327~~

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