An Ubuntu kernel bug causes container crashes

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Nope. Back before VMs were thing it was common to do "lights out" style remote management via a console server. That console server would then have serial (the old 9 pin d-sub plug[1]). You could then connect to your remote servers local TTY. However it did sometimes require some prior set up, depending on your distro[2].

This wasn't just limited to Linux either. It was a common UNIX trick :)

This is a bit of a lost art these days though. iLo, IPMI have replaced the need for serial. Then virtualisation and, to a lesser extent, containerisation have lowered the bar even further plus also moving the industry towards more ephemeral systems that can be destroyed and rebuilt automatically rather than the old habits of nursing failed hosts back to health.

[1] https://duckduckgo.com/?q=9+pin+d-sub+plug&t=newext&atb=v316...

[2] https://www.kernel.org/doc/html/v5.3/admin-guide/serial-cons... (a lot of distros at the time did ship a kernel with this support compiled in. I don't know how common it is now).

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They even have a way to build arbitrary os images: https://github.com/rancher/elemental-toolkit

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They even have a way to build arbitrary os images: https://github.com/rancher/elemental-toolkit

It's pretty great

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