![]() ![]() ![]() On older distros, it might be disabled completely. The sysrq key is enabled on some newer Linux distros by default, although on others it might be configured for accepting values only for certain SysRq functions. How to configure Linux VM to accept SysRq keys In this article, we'll review various Linux distributions and document configurations on how to make GRUB available. Some older distros such as SLES 11 are not configured to display Login prompt in the Azure Serial Console 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. If you do not have access to GRUB watch this video and see, how you can easily automate the disk swap procedure to recover your VM Challenges You could even force the VM to boot from an alternative kernel should you have multiple kernels on disk in the scenario where your primary kernel becomes corrupt.ĭisk Swap – can be automated using either: Other extensions such as Custom Script are available however these options require that the Linux waagent be up and in a healthy state which is not always the case.Įnsuring you have access to the Azure Serial Console and GRUB means that a password change or an incorrect configuration can be rectified in a matter of minutes instead of hours. ![]() The Reset Password feature is known as an Extension and communicates with the Linux Guest agent. The method of recovery depends on the problem being experienced, for example a lost or misplaced password can be reset through Azure portal options -> Reset Password. 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. You can manipulate many configuration files including how the kernel will boot. With the Azure Serial Console, you can interact with your Linux VM as if you were at a system's console. Progress is being made continually to tooling and features to ensure services are recovered quickly. In a Cloud environment, this process has been challenging. There are a number of methods to help recovery of Linux VMs. Watch this video below to see how you can quickly recover your Linux VM once you have access to GRUB Ensure you take backups of files before making changes ![]()
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March 2023
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