Azure serial console linux. Download the serial console logs Once retrieved, check the logs to see if the reason for the failed ignition can be identified. In this edition of Azure Tips and Tricks, Alfred from the Azure Serial Console team will show you how to enable GRUB on your Ubuntu virtual machine. 0-1104-azure x86_64) Sep 10, 2025 · The Azure Serial Console can be used to send a SysRq to an Azure virtual machine using the keyboard icon in the following command bar. Sep 13, 2025 · Add a Virtual Serial Port in vSphere a virtual port vSphere to shutdown power off virtual machine serial console Special Administration Console (SAC) VM settings Add other device → Serial port serial port Use Network ==> Connects the VM serial port over TCP/IP Use named pipe ==> Creates a bidirectional communication channel between the VM and another process (e. You will also learn how to use GRUB to enter single user mode. 15. Apr 17, 2025 · This article describes how to prepare on-premises machines before you migrate them to Azure using the Migration and modernization tool. For the serial console to function properly, the guest operating system must be configured to read and write console messages to the serial port. While fixing the problem by deleting huge syslog files the console in the web-interface stopped responding to my keyboard input and only prints… Jul 8, 2025 · The serial console is the fastest method to resolve the boot issue. It allows you to directly fix the issue without having to present the system disk to a recovery VM. It appears that Ubuntu does not have a serial console server by default. This command provides access to a text-based console for Linux and Windows virtual machines (VMs) and virtual machine scale set instances. It is really annoying. You can use the Azure Serial Console to send SysRq signals to your Linux system. Use steps 1-3 of the VM Repair Commands to prepare a Repair VM. The serial Apr 19, 2023 · Do you have feedback for Azure Serial Console? cross-platform parity (Windows, Linux) feature requests any other feedback Feel free to let us know in one of three ways: Reply to this pinned issue Upvote and comment here: Serial Console F In this video of the Azure and Tips and Tricks series, Craig from the Azure Serial Console team will show you how to get started with the Azure Serial Consol Jun 22, 2021 · On Azure, SysRq keys can be sent from the GUI interface of the serial console of a virtual machine. Azure Sep 9, 2024 · The Azure VM Serial Console provides access to a text-based console for Linux virtual machines. service systemctl enable serial-getty@ttyS0. Sep 26, 2018 · Alfred Sin joins Donovan Brown to discuss the Azure Serial Console, which is now generally available in all public clouds. Selecting Serial console in the Help section of the Azure portal provides access to the serial console. Review Mar 31, 2023 · This is because the Serial console here is connected to the virtual serial port on the VM, so it's unaffected by the lack of SSH or any other connectivity. Eventually, GRUB in Ubuntu is actually really easy to modify. You can use the console to troubleshoot your SSH connection in an interactive shell. See above for the grub configuration. Most Endorsed Azure Linux distributions have the serial console configured by default. Select a method for migrating VMware vSphere VMs. The GRUB rescue console prompt isn't shown in the Azure serial console log, but it can be shown in the Azure boot diagnostics screenshot. Oct 8, 2023 · I have port 22 open for ssh, but unable to connect to linux VM even after redeploy. , SSH is misconfigured). Mar 1, 2021 · In this post, I will present the apps (including Azure Console) that we can use to connect to an Azure Linux VM. I googled the web, and used CoPilot ( which is sometimes useless ) it says to install a packages called sersial-console-serial. For more information, see Configure Azure Storage firewalls and virtual networks. Jun 8, 2020 · RedHat Enterprise Linux running version 7. For example, loglevel=6 will print all messages less than 6 (not equal to just less than). Azure Portal/CLI/PowerShell: The interfaces used to access and manage the Serial Console. It is using COM1 port of the virtual machine. For Linux VMs, the serial connection connects to the ttys0 serial port of the VM or virtual machine scale set instance, providing access to it independent of the network or operating system state. (Offline method) Create a Rescue VM to fix VM boot issues manually. 04 VM created with secure boot enabled. Serial Console. Jul 8, 2025 · During the boot process, the boot loader tries to locate the Linux kernel and hand off the boot control. I think the server was originally set up from a non-azure image since I did have to modify GRUB_CMDLINE_LINUX to actually display the grub loader in Azure Serial console. Serial Console connects to the ttyS0 or COM1 serial port of the VM or virtual machine scale set instance, providing access independent of the network state. Jul 8, 2025 · Use the serial console Connect to the serial console of the VM from the Azure portal. Mar 20, 2024 · We have setup the Use Serial Console with custom boot diagnostics storage account firewall enabled for a while now but looks something change on MS end. More details are available in the Serial Console documentation. Apr 15, 2024 · This article describes how to use Serial Console for GRUB in Azure virtual machines. The serial console can only be accessed by using the Azure Sep 15, 2025 · Troubleshoot Azure Linux VM when there's no access to Azure Serial Console and the disk layout uses Logical Volume Manager Applies to: ️ Linux VMs This article provides a troubleshooting guide for an Azure Linux virtual machine (VM) where all the following conditions are presented: The VM isn't booting up. There are several apps in the market, but in this post, I will present only the free solutions we can easily find in the net. You will also lea I followed this tutorial and now I'm able to connect to serial line. , a terminal emulator or The Serial Console in the Azure portal provides access to a text-based console for Linux virtual machines (VMs) and virtual machine scale set instances. The Serial Console in the Azure portal provides access to a text-based console, please refer this document for more details. Use the Azure Serial Console: The Azure Serial Console allows you to interact directly with the VM even when SSH is unavailable. com to *. Oct 12, 2018 · Introduction Microsoft recently announced that the Azure Virtual Machine Serial Console is generally available in global Azure regions. 2 image and subsequently updated to AlmaLinux 9. The steps can vary based on the type of Linux OS used and access to the root account. Create your free account today with Microsoft Azure: https://azure. serialconsole. How can I send modifier keys to Azure's Serial Console? Sep 29, 2022 · Hi, my HD on my azure vm was full and my only way to access the vm was via the azure cloud serial console. Review URL and port access for machines you want to migrate. I have deployed a Linux VM on MS Azure, I connect to the same via serial console. This feature allows you to mimic pressing the SysRq key and characters entered on a physical keyboard. Resetting the NIC, redeploying the VM, reapplying the VM, assigning a new NIC and replacing the old, nothing seems to work. Mar 30, 2023 · Step 1: Go to set after you reboot the VM from the serial console blade, you don't see GRUB show up. 6 LTS testvm1 ttyS0 testvm1 login: Imran123 Password: Last login: Mon Mar 27 06:38:41 UTC 2023 from 49. May 14, 2024 · Hi everyone,We've just created a couple of Azure Clearpass VM appliances but we're having problems with establishing a serial console connection. If this handoff can't be performed, the virtual machine (VM) enters a GRUB rescue console. Navigate to your VM in the Azure portal>Under Support + troubleshooting>select Serial console Jul 28, 2024 · Safe Mode Safe Mode Azure serial console a text-based console virtual machines (VMs) virtual machine scale set instances Linux Windows Serial Console ttyS0 COM1 serial port VM virtual machine scale set instance independent of the network operating system state serial console Azure portal Azure CLI Contributor higher VM virtual machine scale set Regions Serial Console regions https://learn Note This reference is part of the serial-console extension for the Azure CLI (version 2. The following message appears near the end of the output: The SELinux configuration is managed by the system administrator. 04. I'm now trying to repeat the process Common errors Next steps Learn more about the Azure Serial Console for Linux VMs Learn more about the Azure Serial Console for Windows VMs Aug 29, 2019 · In this video of the Azure Tips and Tricks series, Ken from the Azure Serial Console team will show you how to enable GRUB on your RHEL VM. Make sure you meet the necessary prerequisites for your distribution. For PC style serial ports it’s the config option next to menu option: Character devices ‣ Serial drivers ‣ 8250/16550 and compatible serial support ‣ Console on 8250/16550 and compatible serial port You must compile serial support into the kernel Dec 18, 2023 · The Azure Serial Console allows you to connect to your VM when SSH or RDP are not available. MAC provides a more controlled environment for resource access and removes the ability of the root user to access all resources on the operating system (OS) without restrictions. When an Azure Linux VM boots with some services, it doesn't boot properly. i am using terminal with ssh key authentication, and am using this exact same ssh key… Applies to: ️ Linux VMs [!INCLUDE CentOS End Of Life] Grand Unified Bootloader (GRUB) operates at an early stage in a Linux virtual machine (VM) boot process. Sep 18, 2024 · Step 2: Use the Serial Console for Deeper Insights Azure provides access to the serial console for Linux and Windows VMs. Use the Azure serial console to interrupt Feb 7, 2018 · When attempting to access either an Ubuntu Linux VM or Windows Server 2016 VM (after enabling SAC), I receive the following error: "The serial console connection to the VM encountered an error: 'Fo Azure Serial Console issue and feature tracking Overview This repository is offered for tracking features and issues with the Azure Serial Console. 04 VM using ssh over public IP, i am getting your account has expired; please contact your system administrator. The below has the most well-known apps (including Azure Serial Console). The Azure Serial Console works with Windows and Linux virtual machines. You will Feb 6, 2025 · I want to operate on my Rocky linux boot process to get into emergency mode, but I do not see it in serial console. Identify the specific kernel-related boot issue. This works for both Windows & Linux VMs. May 14, 2020 · The Azure Serial Console works with Windows and Linux virtual machines. For more tips and tricks, visit: https://azuredev. Console Output and Screenshot support for Azure virtual machines. If you don't have serial console access, follow the offline approach to access the contents of the problematic OS disk from a rescue virtual machine. 83 on pts/0 Welcome to Ubuntu 18. This out-of-band management capability is invaluable for troubleshooting scenarios where traditional network connectivity (like SSH or RDP) is unavailable or compromised, such as a misconfigured Aug 23, 2025 · A simple and effective guide to address access and connection issues to an Azure VM using Azure Serial Console. Apr 15, 2024 · To identify a dracut boot issue, use the Azure portal to view the serial console log output of the VM in the boot diagnostics pane, serial console pane, or use AZ CLI. Apr 6, 2025 · Forgetting your VM password or losing your SSH key can be stressful, but Azure provides multiple ways to recover access. Also we have a client with a enterprise subscription and we can connect without problems So, do you know if Microsoft May 12, 2019 · I need to gain root access to a newly-created VM hosted on Microsoft Azure. Jul 16, 2021 · However, there are other ways for troubleshooting Azure VM from portal. 1. However, when connected via the Azure serial console and… Mar 13, 2019 · Azure VM now have serial console access via Azure portal. The kernel supports a parameter to do this called console= meaning we can use /etc/default/grub to setup both. Dec 21, 2023 · This command sends the Alt-SysRq-F key combination to the server's serial port. Right now it is not working with firewall enabled. refer this document for more details. Using Run Command Demonstrate how to use Azure serial console to interact with GRUB which allow's appending of directives to the kernel command line. Mar 14, 2021 · The Azure Serial Console provides a way to interact with your Linux VM at a lower level, even if the networking configuration isn’t working (e. anyone… Nov 2, 2022 · I am trying to login to a linux server using the Azure serial console option provided in the browser GUI of Azure Portal. How can I do this by using screen or minicom or something else? Mar 26, 2018 · Microsoft finally listened to the feedback from its users and today announced the public preview of both Serial Console access for both Linux and Windows VMs. Below are three methods to reset your credentials. To get to the console, select "Support + troubleshooting/Serial console" in the menu of the machine on the Azure portal. Sep 10, 2025 · You can manipulate many configuration files including how the kernel will boot. Aug 7, 2024 · The serial console can be disabled for a specific VM or virtual machine scale set by disabling the boot diagnostics setting. press Enter for maintenance or P May 13, 2020 · The Serial Console in the Azure portal provides access to a text-based console for Azure virtual machines (VMs) and virtual machine scale set instances. 3 image. Aug 10, 2021 · I got a linux VM in Azure and from the screenshot via the Boot Diagnostics menu, I can see that it gives the following message : "you are in emergency mode. To perform offline recovery, the ability to create a VM and manage disks in Azure is required. console. Mar 27, 2018 · Source: https://azure. Nov 6, 2024 · Use the Azure portal to view the serial console log output of the VM in the boot diagnostics blade, serial console blade, or AZ CLI to identify the specific kernel panic string. Reset Password via Azure CLI: az vm user update --resource-group <ResourceGroupName> --name <VMName> --username <AdminUsername> --password <NewPassword> Serial Console for VM: For Linux: Use the Azure Serial Console to Jul 1, 2021 · Serial console We need to tell the kernel to output to serial and we need to tell grub to output to serial. azure. Applies to: ️ Windows VMs [!INCLUDE Feedback] The Serial Console in the Azure portal provides access to a text-based console for Windows virtual machines (VMs) and virtual machine scale set instances. Interestingly, VMs created initially from an AlmaLinux 9. Manual access to single-user mode is required to reconfigure fstab. 4. com to your firewall allow list. This serial connection connects to the COM1 serial port of the VM or virtual machine scale set instance, providing access to it independent of the network or operating system state. If the user account is expired or you want to create a new account, you can use the following methods to create a new local admin account and regain access to the VM. When I click the 'Azure Serial console' on the Azure resource screen of a VM, a CLI interface is visible but it shows that… Sep 15, 2025 · Reset the password by using the serial console with single-user mode You can use the serial console to reset the admin user or root account through single-user mode for VM access. Azure serial console access is only available via Azure portal. Try resetting the password again or create a new local administrator account. Hey all, I have a VM that I just migrated from on prem to Azure and the NIC is not connecting. While the first blog post discussed various tracing activities, such as using Azure activity 6 days ago · The Azure VM Serial Console can be used for console access to your VM if modifying fstab results in a boot failure. 04 VMs that have secure boot enabled, so a machine operator key (MOK) needs to be installed upon rebooting of these VMs. Some older distros such as SLES 11 are not configured to display Login prompt in the Azure Serial Console In this article, we'll review various Linux distributions and document configurations on how to make GRUB available. Bi-Directional Serial Console for Azure Virtual Machines and Virtual Machine Scale Sets using a Windows example. This serial connection connects to the ttys0 serial port of the VM or virtual machine scale set instance, providing access to it independent of the network or operating system state. 207. In case that it doesn't work, you need to make sure that you have all of the prerequisites in place and you can follow these steps. Jul 8, 2019 · The serial console gives you an excellent troubleshooting "back door" into your Windows or Linux VMs in Azure. com. May 13, 2020 · The Azure Serial Console works with Windows and Linux virtual machines. In GRUB, you can modify your boot Sep 15, 2025 · Tools to recover Linux VM from no boot scenarios VM Serial Console With the Azure Serial Console, you could recover several no boot scenarios, for example: Booting the system over previous kernel versions Booting the system in single-user mode Azure VM repair commands With this tool, you can create a repair VM and attach a copy of the OS disk Aug 13, 2025 · Azure CLI を使用してシリアル コンソールにアクセスする Azure CLI を使用して、Linux または Windows を実行する仮想マシンまたは仮想マシン スケール セット インスタンスのシリアル コンソールに接続する方法については、 az serial-console を参照してください。 The Serial Console in the Azure portal provides access to a text-based console for Linux virtual machines (VMs) and virtual machine scale set instances. It is a great tool to troubleshoot Azure IaaS VMs if you lost access to the machine using RDP, SSH, or PowerShell remoting. tips Get started with 12 months of free services and $200 USD in credit. Alternatively, you can use a functioning Linux VM with Azure-level access to the corrupted disks. microsoft. com/en-us/blog/virtual-machine-serial-console-access/ Now, you can debug fstab error on a Linux VM for example, with direct serial-based access and fix issues with the little effort. Just sits there with a red x on the connection. . (Serial console in the Azure portal) The `az vm serial-console` command is part of the Azure Command-Line Interface (Azure CLI) and provides a secure, interactive way to connect to the serial console of an Azure Virtual Machine (VM). In this video of the Azure and Tips and Tricks series, Craig from the Azure Serial Console team will show you how to get started with the Azure Serial Console on a Linux Virtual Machine. After installing the agent, if I ran the command mokutil --list-new, it displayed the Acronis key, and once I connected to the VMs serial console and rebooted it, the machine booted showing the MokManager, in which I was able to install the Acronis key. Mar 9, 2022 · Situation Azure Serial Console displays unexpected characters (Ä and Ü) in place of open and closing brackets and does not accept user input as expected. g. Aug 22, 2024 · To do this, add your network or the client/browser's Internet IPs as firewall exclusions. Troubleshooting Steps: Use the Azure Reset Password Tool: Go to Azure Portal > VM > Reset password. For more information, see Virtual machine serial console for Linux. For Windows VMs, view Event Viewer logs by running eventvwr. For Windows VMs, the serial connection connects to the COM1 serial port of the VM or virtual machine scale set instance In this video of the Azure and Tips and Tricks series, Craig from the Azure Serial Console team will show you how to get started with the Azure Serial Console on a Linux Virtual Machine. Mar 13, 2019 · Azure VM now have serial console access via Azure portal. If you receive a "Web socket is closed or couldn't be opened" error message, add *. We can gain recovery or e We have some clients with a CSP subscription and some days ago we can connect to Linux vm via serial console without problem, but now since 1 or 2 weeks ago we can’t, it only say “the serial console connection was closed. This article provides an overview of each tool and its intended use case to minimize confusion about these power management options. To configure the storage firewall for Azure Serial Console, see Use Serial Console with custom boot diagnostics storage account firewall enabled. You must use the Serial Console to access GRUB. Prerequisites Azure Serial Console is ONLY available in ARM resources and NOT in ASM (Classic Sep 14, 2020 · An Azure service that is used to provision Windows and Linux virtual machines. service Wait until the changes will be replicated, then connect directly from the Azure Console. Oct 19, 2020 · To enable the Serial Console you have to log into your on-premise Linux VM and run the following: systemctl start serial-getty@ttyS0. Sep 15, 2025 · Provides a troubleshooting guide for an Azure Linux VM when there's no access to Azure Serial Console and the disk layout uses Logical Volume Manager. As the VM has dropped us into emergency mode, something has gone wrong. How can I solve the problem? Aug 7, 2024 · The serial console can be disabled for a specific VM or virtual machine scale set by disabling the boot diagnostics setting. Jun 3, 2024 · What happened to the serial console in Azure portal? This feature has been particular useful when dealing with issues when SSH or remote access isn't available and for booting into recovery mode. Go to "Boot Diagnostics"-->"Serial Console" 3. This is done on FreePBX (running CentOS) by sending the keys Alt + F9 on the console and issuing the command !passwd root. Sep 15, 2025 · Applies to: ️ Linux VMs This article provides three methods to reset local Linux Virtual Machine (VM) passwords. Dec 19, 2023 · This is the second installment of the Azure Serial Console blog, which provides insights to improve defenders’ preparedness when investigating Azure Serial Console activity on Azure Linux virtual machines. Support for Serial Console comes naturally to Linux VMs. But, sometimes you just need these to sit and wait and can't hit the every few minutes to keep the serial console alive. Apr 15, 2024 · The Unix security model is based on Discretionary Access Control (DAC). Serial console can now be turned off for all VMs in a subscription. This command is specifically designed to connect to the serial console of a virtual machine hosted within Microsoft’s Azure cloud platform. Jump To: [02:12] Demo Start For more information:Virtual Machine Mar 1, 2023 · Microsoft Threat Hunting Azure Serial Console Attack and Defense - Part 2 Tuesday, December 19, 2023 This is the second installment of the Azure Serial Console blog, which provides insights to improve defenders’ preparedness when investigating Azure Serial Console activity on Azure Linux virtual machines. See below for a quick video on how to access Serial Console. Navigate to the VM’s “Serial Console” and log in. 6 LTS (GNU/Linux 5. When you review the serial console Sep 15, 2025 · To troubleshoot Scenario 1: Network Hyper-V driver is disabled and Scenario 2: NIC media access control (MAC) address is changed or doesn't match, you need serial console access for your Linux VM. Jan 8, 2025 · The following issues can occur due to incorrect HugePages configuration: After you migrate a Linux VM from on-premises to Azure, the VM doesn't boot properly. Apr 15, 2024 · Check the serial console from the Azure portal or through the Azure CLI. Azure can access it by going to the Azure portal and visiting the Support + Troubleshooting section. Jul 29, 2025 · The Serial Console in the Azure portal provides access to a text-based console for Linux virtual machines (VMs) and virtual machine scale set instances. Dec 19, 2023 · This section of the blog covers how to log Azure Linux virtual machine events using Sysmon for Linux and Microsoft Defender for Endpoint (for Linux) agents to capture the Azure serial console activity artifacts. Typically, ignition will fail due to connectivity issues with the infrastructure Feb 1, 2018 · In the meantime, to allow the serial console connection to succeed you can use the workaround of explicitly granting a role-based access at the subscription, resource group or virtual machine level: May 3, 2019 · I was able to create a vhd images and upload it to Azure, however I cannot access the serial console. Using Azure Portal (Help Section) Navigate to your VM in the Azure Portal: Go to Help > Reset password (for Windows) or Reset SSH (for Linux). Step 3: Restart and Resize the VM Oct 7, 2024 · Hi Burzynski, Christopher, If you've lost SSH access to your Azure Linux VM after running a yum update, there are a few ways to regain access and troubleshoot the issue. Jan 3, 2024 · I have installed the Acronis cloud protect agent on a couple of Ubuntu 20. It operates before the Linux kernel is loaded and before any system services (such as networking or SSH) are started, so GRUB isn't accessible via SSH. Jul 29, 2025 · The Serial Console in the Azure portal provides access to a text-based console for Linux virtual machines (VMs) and virtual machine scale set instances. 2. 0 or higher). Security-Enhanced Linux (SELinux) implements Mandatory Access Control (MAC) for Linux by using kernel modules and user space tools. Mar 20, 2022 · 仮想マシン (Azure VM)のシリアルコンソールの機能概要から、利用開始までの設定手順、シリアルコンソールを使って仮想マシンへ接続する方法、シリアル接続時のアクティビティログの出力内容を紹介していま To retrieve the serial console logs in Azure: 1. The serial console is the fastest method to resolve the boot issue. I am trying to see if I can serial console it and while it looks like the console tries to launch, it doesn't return a command Common Commands Common Common Common Common Common Common Common Common Common Common Common Common Common Common Common Common Common Common Common Common Jun 18, 2018 · Known issue as Az Serial Console Feature is not supported using the boot diagnostic storage account in combination with Azure Storage Firewall. The serial console can only be accessed by using the Azure Feb 14, 2025 · If you cannot access the VM via SSH, you can use the Azure Serial Console to troubleshoot further. 213. Choosing "Send SysRq Command" opens a dialog, which provides common SysRq options or accept a sequence of SysRq commands entered into the dialog. Bi-Directional Serial Console for Azure Virtual Machines and Virtual Machine Scale Sets using a Linux example. com Jan 6, 2022 · Serial consoles are a great way to find kernel panics that are too gruesome to make it to logs or even a video console. 7. Anyway to get rid of the timeout? Apr 27, 2018 · Azure's Virtual Machine Serial Console provides access to a text-based console for Linux and Windows Virtual Machines on Azure. Azure Data Explorer Feb 13, 2021 · my solution was by entering Serial Console on Azure Portal check on netstat -anlp for checking SSH service is listening, allowing rule of the SSH port on firewall In my case the SSH is non-standard port let's assume its 1234 (in your case may vary) in the Serial console try the following command to add ssh rule. The system Aug 23, 2025 · Guida pratica per risolvere problemi di connessione e accesso a una VM Azure utilizzando la Azure Serial Console. In this article, you: Review migration limitations. Turn off boot diagnostics from the Azure portal to disable the serial console for the VM or the virtual machine scale set. Bitvise Client Putty Client & Putty Generator Azure Serial Console Before start Sep 15, 2025 · Requirements for offline recovery If the Serial Console requirements for online recovery can't be met, perform offline recovery by using a rescue VM. It only shows booting process after some modules are started. For Linux VMs, check the logs in /var/log/ and /boot/grub/. Access to Azure CLI or Azure Cloud Shell is Aug 26, 2025 · The service URL of the Serial Console is changed from *. Check out my Pluralsight training: https://www I previously installed the Acronis backup agent on an Ubuntu 20. The system administrator can resolve this issue by using one of the following methods. Follow the single-user mode documentation to access single-user mode for each supported Linux partner image. Jun 21, 2025 · Azure Serial Console Service: The core Azure service that manages the serial console connections. Unfortunately the Azure serial console always disconnects on a reboot and takes so long to reconnect that the VM is well past the GRUB menu when it comes back up. msc. To be able to use Azure Serial Console on this machine, you will need to remove the firewall limitation to your VNET and leaving that storage account to allow connections from “all networks” Mar 31, 2018 · @enihcam The way I'm interpreting your question is that you're trying to compile a custom kernel ultimately for image upload and usage in Azure, and you need to know how to configure it such that serial console works with your image. The Serial Console in the Azure portal provides access to a text-based console for Linux virtual machines (VMs) and virtual machine scale set instances. Use the Azure serial console to interrupt Not all Linux Azure VMs are configured by default for GRUB access and neither are they all configured to be interrupted with the sysrq commands. Jul 29, 2025 · The Serial Console in the Azure portal provides access to a text-based console for Windows virtual machines (VMs) and virtual machine scale set instances. With this feature we are being able to access the Virtual Machine (Windows or Linux) via a text-based console, which is connected to the COM1 virtual machines port. Boot diagnostics. Sep 10, 2025 · Applies to: ️ Linux VMs ️ Windows VMs This article lists common error messages that you might see within the Azure Serial Console, and provides steps to mitigate the errors. Is it normal wh Linux Serial Console ¶ To use a serial port as console you need to compile the support into your kernel - by default it is not compiled in. Nov 10, 2023 · in azure when connecting from a macbook to an ubuntu 18. After you downsize an Azure Linux VM, it doesn't boot properly. In my demo I am Jan 8, 2025 · To fix the issue, follow these steps: Access the VM using one of the following methods: Boot the VM in single-user mode using the Azure Serial Console if the serial console is working. Replace <server_ip> with the server's IP address, <username> with the iDRAC user name, and <password> with the iDRAC password. Check hypervisor and operating system requirements for machines you want to migrate. Mar 31, 2019 · The serial console feature is available for Windows and Linux VM images. It allows you to interact directly with the VM’s operating system, bypassing network-level SSH restrictions. Follow the prompts to set a new password or SSH key. It is not depending on the virtual machine’s network or operating system state. Enable Sep 10, 2025 · Applies to: ️ Linux VMs ️ Windows VMs The Azure Serial Console provides several powerful tools for power management on your virtual machine (VM) or virtual machine scale set. Mar 26, 2018 · Serial Console for Virtual Machines is available in all global regions starting today! You can access it by going to the Azure portal and visiting the Support + Troubleshooting section. To reconnect press enter” and nothing happen. Both of them Sep 5, 2019 · In this edition of Azure Tips and Tricks, Alfred from the Azure Serial Console team will show you how to enable GRUB on your Ubuntu virtual machine. Serial console enables you to use an interactive shell in situations where you may be unable to SSH or RDP into your VM, which make it super-easy for troubleshooting and self-serve diagnosing of your VM. This serial connection is to COM1 serial port of the virtual machine Oct 12, 2018 · Resetting RHEL Root PW with Azure Serial Console Florin Loghiade in Azure Azure Linux Console Azure Serial Console Azure VM Debugging Azure VMs Azure Windows Console Red Hat Azure VM RHEL VM Debugging VM Diagnostics Sep 16, 2025 · If you're unable to access the VM using the Azure Serial Console, then the repair must be done in offline mode, as the VM isn't booting. Mar 26, 2023 · I tried to login with serial console, In Vm ->serial console -> Only username and password its login successfully like below: Output Ubuntu 18. The Linux images in Azure do support serial access. In this edition of Azure Tips and Tricks, Alfred from the Azure Serial Console team will show you how to use the Azure Serial Console to drop into single user mode and fix a broken fstab entry In this video of the Azure Tips and Tricks series, Ken from the Azure Serial Console team will show you how to enable GRUB on your RHEL VM. Apr 11, 2018 · Then you must ensure that the guest OS is configured to allow serial console access. 3 maintain serial console accessibility. This is ideal for recover machines/data, modify system configurations & troubleshooting. Repair the Linux VM using the Azure VM repair commands. Serial console enables you to use an interactive shell in situations Apr 26, 2018 · In this Ask the Admin, I'll show you how to access an Azure Windows Server virtual machine using the serial console independently of the OS and network. You Oct 28, 2011 · To set the console loglevel in Red Hat Enterprise Linux 6, pass loglevel=' as a boot time parameter. Jul 15, 2024 · Specifically, the serial console remains blank after deploying a Azure VM from the custom AlmaLinux 9. The extension will automatically install the first time you run an az serial-console send command. Cloud end-users may notice this issue after patching. it works only when you allowed the network. For most Windows images that are created in February 2018 or after that, it will work out-of-the-box. The creation of the log analytics workspace and enabling Azure activity monitoring is covered in Part 1 of the blog. Learn more about extensions. Dec 17, 2024 · The az serial-console command is part of the Azure Command-Line Interface (CLI), commonly referred to as az. This repository is monitored by the Azure Serial Console product team in order to engage with our community and discuss questions, customer scenarios, or feature requests. The more experienced Linux/Unix sys admins will appreciate the single user and emergency modes that are accessible via the Azure Serial Console making Disk Swap and VM deletion for many recovery scenarios redundant. The sign-in prompt is displayed slowly, and you can't sign in. Access the virtual machine in question in the Azure console 2. Apr 19, 2022 · An Azure service that is used to provision Windows and Linux virtual machines. Note: Azure serial console expects device ttyS0 and a baud rate of 115200 or 9600. Dec 10, 2021 · The bi-directional Azure Serial Console is impacted by this incompatibility, however, serial logs and screenshots in boot diagnostics continue to be available for virtual machine troubleshooting. It also Sep 26, 2018 · The latest features for serial console include a subscription-level enable/disable feature, support for magic SysRq keys, support for non-maskable interrupts, accessibility improvements, and performance and stability improvements. The top bar of the console holds a tool for sending SysRq keys. The details on this feature are in our documentation for Linux and Windows VMs. After I have installed Docker I get this output below every 2 minutes or so. Aug 11, 2025 · Serial Console in the Azure portal provides access to a text-based console for virtual machines (VMs) and virtual machine scale set instances running either Linux or Windows. Now I want to change the width of terminal. If you are using Serial Console on a virtual machine scale set, ensure you upgrade your virtual machine scale set instances to the latest model. eammq xyird byjn rjvfk nsdlway bjilozs hkre cztck bdenn inzf