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51 lines
1.7 KiB
Plaintext
51 lines
1.7 KiB
Plaintext
// Module included in the following assemblies:
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//
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// microshift_configuring/microshift_low_latency/microshift-low-latency.adoc
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:_mod-docs-content-type: PROCEDURE
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[id="microshift-low-latency-install-kernelrt_{context}"]
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= Installing the {op-system-rt-kernel}
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Although the real-time kernel is not necessary for low latency workloads, using the {op-system-rtk} can optimize low latency performance. You can install it on a host by using RPM packages, and include it in a {op-system-ostree-first} image deployment.
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.Prerequisites
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* You have a Red Hat subscription that includes {op-system-rt-kernel}. For example, your host machine is registered and Red Hat Enterprise Linux (RHEL) is attached to a RHEL for Real Time subscription.
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* You are using x86_64 architecture.
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.Procedure
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. Enable the {op-system-rtk} repository by running the following command:
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+
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[source,terminal]
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----
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$ sudo subscription-manager repos --enable rhel-9-for-x86_64-rt-rpms
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----
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. Install the real-time kernel by running the following command:
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[source,terminal]
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----
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$ sudo dnf install -y kernel-rt
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----
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. Query the real-time kernel version by running the following command:
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[source,terminal]
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----
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$ RTVER=$(rpm -q --queryformat '%{version}-%{release}.%{arch}' kernel-rt | sort | tail -1)
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----
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. Make a persistent change in GRUB that designates the real-time kernel as the default kernel by running the following command:
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[source,terminal]
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----
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$ sudo grubby --set-default="/boot/vmlinuz-${RTVER}+rt"
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----
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. Restart the host to activate the real-time kernel.
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.Next steps
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. Prepare your {microshift-short} workloads for low latency.
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. Optional: Use a blueprint to install the real-time kernel in a {op-system-ostree} image.
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