Sunny Pi is a Raspberry Pi 4 (Model B, rev 1.5) (2 GB RAM) that serves as a backup for some of the most important services provided by the Pi 400. Its hostname is sunny.

Pages

  • Deployment guide (steps for deploying all the software onto a fresh Raspberry Pi)

Hardware

The device is a Raspberry Pi 4 Model B (rev 1.5) with 2 GB RAM.

It’s powered by a 15W USB PD power supply connected via a USB-C cable.

It uses a 64 GB microSD card for its root filesystem.

Networking

Sunny Pi has a static IPv4 address of 192.168.1.40 and hostname sunny.

Software

Sunny Pi uses Ubuntu Server, specifically Ubuntu Server 25.04 (Plucky Puffin).

Redundancy with Pi 400

Limitations of the redundant setup

The main single point of failure that sunny and rpi share is their network connection, as they are both connected to the same network switch. The switch also has a single dependency on a Devolo Powerline adapter. While the switch has operated without issues for 2 years (deployed Oct 2023), the Powerline adapter has gone down in the past, taking anything connected to the switch offline. I plan to remove this single point of failure by connecting sunny to a different Powerline adapter.