UPS for NAS - Automatic Shutdown

[rsaeon]

@jayanttyagi

Coz turning on ups back and your devices can be pita, if you are out.

Use a smart plug to cut power after shutdown, that way when you turn on the smart plug, your system boots up with that bios setting (power on after power loss).

@jayanttyagi

With proper ups or maybe a better way including info about about battery percent, we can shutdown when really needed like 30% battery or so.

This is what I did with my IoT battery monitors, when voltage crossed a threshold, the script initiated shutdown. I use mqtt to communicate between the various systems, nodered for logic and telegram for notifications.

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Making the battery monitors: DIY Wi-Fi Battery Monitor for Inverters/UPS (IoT Lead Acid Battery?)

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The system in action:

@rsaeon

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Some explanation:

@rsaeon

I’ll try and summarize:

1. mqtt flow starting with battery status: logging battery voltages reported by tasmota into influxdb
2. mqtt flow starting with pve netwatch: updating global arrays ‘pve_nodes-offline’ or ‘pve_nodes-online’ with whether a node is online or offline, as reported by a virtualized router
3. mqtt flow starting with deb netwatch: this section basically watches my vms, if they go offline and a shutdown isn’t planned or ongoing, then they’re started/restarted, depending on if they crashed or hanged — status is pulled in from proxmox’s metrics that are directly sent to influxdb, the mqtt trigger is from another virtualized router
4. flow that’s run every 30 seconds: get battery voltages from influxdb and start processing the data in the battery monitor node:

• if there’s a power outage, immediately shutdown the workstation cluster
• also if there’s a outage, start logging battery voltages to telegram, all of the link-out nodes are to telegram in this flow
• if the battery voltages fall to low, trigger shutdown of the other cluster
• five minutes after the shutdown signal, turn off all the sockets in the “pdu” (a bunch of tasmota smart plugs)
• after power returns and has been available for 10 minutes, trigger start-up by turning on the “pdu” (triggered by the BIOS setting of power on after ac power loss).

This was one of my earliest node-red flows so it’s probably in need a lot of refinement.

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A older clip of the automated staggered start-up sequence:

Staggered Start-Up of Proxmox Nodes