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support/azure/virtual-machines/linux/serial-console-linux.md

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ms.topic: article
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ms.tgt_pltfrm: vm-linux
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ms.workload: infrastructure-services
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ms.date: 01/09/2025
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ms.date: 02/10/2025
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ms.author: mbifeld
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---
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Serial console text only takes up a portion of the screen size (often after using a text editor). | Serial consoles do not support negotiating about window size ([RFC 1073](https://www.ietf.org/rfc/rfc1073.txt)), which means that there will be no SIGWINCH signal sent to update screen size, and the VM will have no knowledge of your terminal's size. Install xterm or a similar utility to provide you with the `resize` command, and then run `resize`.
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Pasting long strings doesn't work. | The serial console limits the length of strings pasted into the terminal to 2048 characters to prevent overloading the serial port bandwidth.
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Erratic keyboard input in SLES BYOS images. Keyboard input is only sporadically recognized. | This is an issue with the Plymouth package. Plymouth should not be run in Azure as you don't need a splash screen, and Plymouth interferes with the platform's ability to use Serial Console. Remove Plymouth with `sudo zypper remove plymouth` and then reboot. Alternatively, modify the kernel line of your GRUB config by appending `plymouth.enable=0` to the end of the line. You can do this by [editing the boot entry at boot time](./serial-console-grub-single-user-mode.md#single-user-mode-in-suse-sles), or by editing the GRUB_CMDLINE_LINUX line in `/etc/default/grub`, rebuilding GRUB with `grub2-mkconfig -o /boot/grub2/grub.cfg`, and then rebooting.
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Serial console and serial logs may be unavailable following a live migration for VMs with Trusted Launch and Secure Boot enabled. | Serial console and serial logs will be available following a subsequent reboot.
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Serial console and logs might not be available after live migration for VMs with Trusted Launch and Secure Boot enabled. | Serial console and logs will be available after the next reboot..
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## Frequently asked questions
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