49 lines
1.6 KiB
Markdown
49 lines
1.6 KiB
Markdown
|
+++
|
|||
|
|
date = '2025-11-03T09:31:57+01:00'
|
|||
|
|
draft = false
|
|||
|
|
tags = [ "homelab" ]
|
|||
|
|
title = 'A little energy-conciousness'
|
|||
|
|
+++
|
|||
|
|
|
|||
|
|
I like when things take care of themselves.
|
|||
|
|
But before you can automate backups, the machine to be backed up has to be awake.
|
|||
|
|
Pennsardin — my big desktop tower running a RAID 5 array — has an annoying tendency to sleep deeply.
|
|||
|
|
|
|||
|
|
Instead of leaving it powered on 24/7 just “for convenience,” I chose **energy sobriety**.
|
|||
|
|
My main server stays on, but the others only wake up when they actually have work to do —
|
|||
|
|
in this case, during nightly backups.
|
|||
|
|
|
|||
|
|
A short Bash script, a bit of patience, and the process flows naturally.
|
|||
|
|
|
|||
|
|
```bash
|
|||
|
|
#!/usr/bin/env bash
|
|||
|
|
|
|||
|
|
MAC="00:52:54:46:58:34"
|
|||
|
|
echo "[+] Waking up Pennsardin via Wake-on-LAN"
|
|||
|
|
wakeonlan ${MAC}
|
|||
|
|
|
|||
|
|
echo "[+] Waiting for Pennsardin to respond"
|
|||
|
|
until ping -c1 192.168.0.12 &>/dev/null; do
|
|||
|
|
sleep 1
|
|||
|
|
printf "."
|
|||
|
|
done
|
|||
|
|
echo -e "\n[+] Pennsardin is online"
|
|||
|
|
|
|||
|
|
echo "[+] Connecting to lomig@pennsardin ..."
|
|||
|
|
exec ssh lomig@192.168.0.12
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
Here’s the idea:
|
|||
|
|
|
|||
|
|
1. A Wake-on-LAN packet brings the system out of its nap.
|
|||
|
|
2. A simple loop waits for the first ping reply — making sure the machine is really awake.
|
|||
|
|
3. Finally, an SSH connection triggers the backup sequence.
|
|||
|
|
|
|||
|
|
This little ritual sums up my homelab philosophy perfectly:
|
|||
|
|
automate without wasting.
|
|||
|
|
You don’t need an always-on cluster to handle a few backups and a blog — just a bit of organization, restraint, and common sense.
|
|||
|
|
|
|||
|
|
Next step?
|
|||
|
|
Scheduling this wake-up via systemd, and letting Pennsardin go back to sleep once the backup is done.
|
|||
|
|
A digital butler — punctual and energy-conscious.
|