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How to remotely reboot a Linux host if SSH fails to connect? (lemmy.nz)

submitted 8 months ago* (last edited 8 months ago) by sylverstream@lemmy.nz to c/selfhosted@lemmy.world

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Edit2: Thanks all for your responses! I have checked the logs, https://lemmy.nz/comment/6192604, and based on that removed tracker-miner-fs as it's a search/index tool which I don't need. No idea why it took over all memory. I'll also get a WiFi Smartplug as a kill switch. Hopefully that solves it. Thanks again heaps!

I've got a HP ProDesk G3 which I'm using as home server, I've installed Ubuntu on it. Earlier this week the services I host on it stopped (Immich & Frigate). I tried to SSH, but it just hung after asking for a password. I could ping it, but it was just unresponsive.

I had to force reboot it manually. This is fine, but I'm not always at home.

The chip has Intel vPro as far as I know, which could be an option, but I have no idea how this works. The documentation on the Intel site seems focused on enterprises. I tried to connect with RealVNC which does not work, so I think I've got to install/configure something on the server first.

I also asked Bing Chat but it came up with non existing packages & commands. Welcome your thoughts!

/edit: I just found this, which seems to be exactly what I need: https://manpages.ubuntu.com/manpages/focal/en/man7/amt-howto.7.html

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[–] cmnybo@discuss.tchncs.de 4 points 8 months ago

You could connect an ESP32 to the power and reset switches through opto-isolators or relays. You will have to do a little bit of programming, but you can host a website on the ESP32 that will allow you to operate the switches remotely.

If you want to get a bit fancier, you could connect the UART on the ESP32 to a serial port on the server through a TTL to RS-232 level converter and have a remote serial terminal embedded in the web page too. That won't do much good if the server is completely locked up though.