meta/architecture-docs/Fediversity-architecture-notes.md

<!-- Note: we're "abusing" the classDiagram for the moment as we sketch this out -->

```mermaid
graph TB

Core[<b>Core-services</b><br><small>DNS<br>Email<br>identity_management<br>secret_management<br>authentication<br>SASL</small>]

Services[<b>Services</b><br><small>NextCloud<br>secure_document_collaboration<br>Forgejo<br>webmail<br>HedgeDoc<br>project_planning</small>]

FediServices[<b>FediServices</b><br><small>Matrix<br>Pixelfed<br>Peertube<br>Mastadon<br>GotoSocial<br>activityPub</small>]

Administration[<b>Administration</b><br><small>monitoring<br>alerting<br>graphing<br>restore_backups</small>]

Management_UI[<b>Management_UI</b><br><small>human-oriented<br>administration<br>replication<br>migration</small>]

Storage[<b>Storage</b><br><small>exclusive_filesystem<br>shared_blob<br>zfs</small>]

Hardware[<b>Hardware</b><br><small>Storage<br>Networking<br>Operating-system<br>Virtualization</small>]

Virtualization[<b>Virtualization</b><br><small>Proxmox</small>]

Nixos[<b>Nixos</b><br><small>Application</small>]

LinuxOS[<b>LinuxOS</b><br><small>Application</small>]

NixOps[<b>NixOps</b><br><small>orchestration</small>]

Hardware --> Storage
Hardware --> Virtualization
Virtualization --> Nixos
Virtualization --> LinuxOS
Services --> Core
FediServices --> Core
Services --> Storage
FediServices --> Storage
Nixos --> Services
Nixos --> FediServices
Management_UI --> NixOps
Management_UI --> Administration
```

* human-centric
* easy, automated, replication and migration to different datacenter provider
* blob storage replicated generically
* files on the exclusive filesystems replicated via application-aware process, e.g.:
  * asynchronous, but "live" database replication
  * shutdown app then rsync directories
  * ZFS replication and snapshot-ing
* Strengths, Weaknesses, Opportunities, and Threats awareness for all apps
* Not everything needs to start on Nix, NixOs, or with NixOps
* Do not use "Open Core"
  * GitLab
  * Dovcot
  * Zimbra
* LXC containers (not Docker-style)