If you connect to this serial port any computing device with a terminal emulation program, it will be possible to work on the Linux PC as if you were using the PC locally in text mode. We get then what is called a serial console It is also possible to send a copy of the boot messages, and start a login prompt on the serial port of the PC. For instance the Linux Kernel has a netconsole feature, to send the boot messages over the network to another Linux computer. Now it is perfectly fine to send the boot messages and start a login prompt on something else. (Actually it spawns multiple login prompts, you can switch between them with Ctrl-alt-F1, Ctrl-alt-F2, etc. This is called in Unix-speak the default console, or system console.ĭuring boot, the kernel sends its boot messages, like device detection, to this default console, and at the end of the boot processes, fires a "login: " prompt on this console. When you start Unix/Linux on a PC, the default input device is the attached keyboard (PS/2 or USB), and the default output device is the available VGA /HDMI / Display port of the PC. you are familiar with xm console from Xen and you want to use a similar feature here.your keyboard layout is borked on the guest.your guest freezes or kernel panics, you want to debug it, but it is impossible to capture all messages on VNC screen.you lost network access to the guest and VNC is either too slow for you or does not have the features you need (i.e.Starting serial terminal on interface serial0 (press control-O to exit) If you do a lot of work over ssh on your pve server you would maybe appreciate to connect to your running VMs Note: This apply to qemu/kvm virtualization. Why would I need a serial terminal / serial console? 4.1.2 Instruct grub2 to send the boot messages on the VGA display and on the serial port.4.1.1 Reboot the VM, verify that the emulated serial port is there.4.1 Configure the terminal if not present.3.1 Add a virtual serial port to the VM.1 Why would I need a serial terminal / serial console?.
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