Install the Red Hat Enterprise Linux for Real Time (real-time kernel)

Although the real-time kernel is not necessary for low latency workloads, using the real-time kernel can optimize low latency performance. You can install it on a host by using RPM packages, and include it in a Red Hat Enterprise Linux for Edge (RHEL for Edge) image deployment.

Prerequisites

  • You have a Red Hat subscription that includes Red Hat Enterprise Linux for Real Time (real-time kernel). For example, your host machine is registered and Red Hat Enterprise Linux (RHEL) is attached to a RHEL for Real Time subscription.

  • You are using x86_64 architecture.

Procedure

  1. Enable the real-time kernel repository by running the following command:

    $ sudo subscription-manager repos --enable rhel-9-for-x86_64-rt-rpms

  2. Install the real-time kernel by running the following command:

    $ sudo dnf install -y kernel-rt

  3. Query the real-time kernel version by running the following command:

    $ RTVER=$(rpm -q --queryformat '%{version}-%{release}.%{arch}' kernel-rt | sort | tail -1)

  4. Make a persistent change in GRUB that designates the real-time kernel as the default kernel by running the following command:

    $ sudo grubby --set-default="/boot/vmlinuz-${RTVER}+rt"

  5. Restart the host to activate the real-time kernel.

Next steps

  1. Prepare your MicroShift workloads for low latency.

  2. Optional: Use a blueprint to install the real-time kernel in a RHEL for Edge image.

← Previous: Use Red Hat Enterprise Linux for Real Time | ↑ Up: Lower latency in MicroShift applications | ⌂ Home: Red Hat build of MicroShift | Next: Install the Red Hat Enterprise Linux for Real Time (real-time kernel) in a Red Hat Enterprise Linux for Edge (RHEL for Edge) image →