Provided a newer kernel is available, you should be able to either manually (or automatically) update the kernel. If any changes were made, reboot your Compute Instance for the new kernel to take affect. Otherwise, if no changes were made, click Cancel. Make any desired changes and click the Save Changes button. *Primary disk: the disk assigned as the “Root Device” within the instance’s Configuration Profile. Since this kernel is maintained regardless of reboots or system updates, it may be preferred in some use cases. Specific Linode Kernel: Allows you to specify the exact Linode kernel to use.This should only be used on older Linux distributions that have Grub (not Grub 2) installed, like CentOS 6. GRUB (Legacy): Uses the upstream distribution-supplied kernel that’s installed on the primary disk*.This is the most common option and has been the default for most new Compute Instances created after August 2018. If a custom kernel has been installed instead, that is used instead. GRUB 2: Uses the upstream distribution-supplied kernel that’s installed on the primary disk.Direct Disk: Instead of a Linux Kernel, this uses the MBR (Master Boot Record) of the primary disk*. This setting was the default for most distributions prior to August 2018. Since new kernel releases are rolled out over a short time period, the actual kernel used by your system may be one or two releases behind. Latest 64 bit and Latest 32 bit: Uses one of the latest 64-bit or 32-bit Linode kernels at the time the Compute Instance boots/reboots, depending on which option you selected.Review the Kernel dropdown menu selection. This may be located within the More Options Ellipses dropdown menu. Navigate to your Compute Instance in the Cloud Manager and click the Configuration tab.įind your current Configuration and click the corresponding Edit link. To determine the actual kernel version installed on your system, see Determining Which Kernel Is Installed. This is especially true if the Compute Instance hasn’t been rebooted in a while or wasn’t rebooted after a change to the instance’s Configuration. These instructions may not accurately reflect the actual kernel version installed. If you are using a Linode kernel (not an upstream kernel), you can also view the kernel version. You can use the Cloud Manager to view the type of kernel you are using. View and Modify the Kernel in the Cloud Manager If the kernel ends with something similar to linode123, a Linode kernel is being used and the string matches the precise Linode kernel release. In this example, the kernel ends with generic, which is common in Ubuntu systems to designate that this is an upstream kernel. The kernel version should be a string that’s similar to 5.4.0-80-generic. cat /proc/version: Outputs a string that contains the kernel version and release details.Can only be used on distributions with systemd (Debian, Ubuntu, CentOS, openSUSE, and more). hostnamectl: Outputs an organized list of system details, including the kernel version.uname -r: Outputs a single line with just the kernel version.Run one of the following commands to display the kernel version: Log in to the Compute Instance through either SSH or Lish. The following instructions cover the most common methods: There are may ways you can determine which kernel version is installed on your Linux system. Most of the distribution images available on Linode use the upstream distribution-supplied kernel by default. For more information on custom compiled kernels, review our guides for Debian, Ubuntu, and CentOS. Compiling a kernel can let you use features not available in the upstream or Linode kernels, but it takes longer to compile the kernel from source than to download it from your package manager. The Current Kernels page displays a list of all the available Linode kernels.Ĭustom-compiled kernel: A kernel that you compile from source. If selected, these kernels are provided to your Compute Instance at boot (not directly installed on your system). Linode kernel: Linode also maintains kernels that can be used on a Compute Instance. It also may support features not present in the Linode kernel (for example, SELinux). A major benefit of this kernel is that the distribution was designed with this kernel in mind and all updates are managed through the distributions package management system. Upstream kernel (or distribution-supplied kernel): This kernel is maintained and provided by your Linux distribution. Your Compute Instance is capable of running one of three kinds of kernels: This guide covers the types of kernels that can be assigned to a Compute Instance and how to view, update, or change the kernel. The kernel interfaces with the system’s hardware and it controls the operating system’s core functionality. The primary component of every Linux system is the Linux kernel.
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