TIL: you can easily get the `aws` CLI tool to set up a SSH server that connects to an EC2 node's serial console. Super useful! (can even get to grub this way)
TIL2: NixOS's default serial-getty seems to exit and NOT restart itself after too many login failures (need `systemd.services."serial-getty@".serviceConfig.Restart = "always”;`). Glad I tested this before I need it.










