Here's my messy-cabled 9u rack.
It has:
- Fiber gateway out of view on top of the rack.
- Switch, which also powers 2 Ruckus APs and 2 other switches.
- Mikrotik RB5009 router.
- Raspberry Pi x3 all running Debian Bookworm. I have too many pis right now, running Home Assistant, LibreNMS, Log collection, and a read-only NUT server that orchestrates shutdowns and startups on power loss. I need to consolidate these.
- 1L PCs. One is on Debian serving media and files. The other is a test server where I'm trying out Immich on openSUSE. I'm considering moving to that and rootless podman for services. To that end I have another of these 1L boxes on my desk trying other options (MicroOS, Fedora IoT, maybe others).
- HDs. These are backup drives for the 1L server. I keep them powered off except when needed.
- UPS and a managed, switched PDU.
Everything is set up for low energy consumption (~90w), remote admin, and recovery from power loss.
It's not very exciting, but: Network UPS Tools (NUT).
Keep everything in good shape in the event of a power outage.