Red Hat build of MicroShift

Reference blueprint for installing Red Hat Enterprise Linux for Real Time (real-time kernel) in a RHEL for Edge image

An image blueprint is a persistent definition of required image customizations that you can use to create multiple builds. You can edit, rebuild, delete, and save the blueprint to easily rebuild images.

Example blueprint used to install the real-time kernel in a RHEL for Edge image

name = "microshift-low-latency"
description = "RHEL 9.4 and MicroShift configured for low latency"
version = "0.0.1"
modules = []
groups = []
distro = "rhel-94"

[[packages]]
name = "microshift"
version = "*"

[[packages]]
name = "microshift-greenboot"
version = "*"

[[packages]]
name = "microshift-networking"
version = "*"

[[packages]]
name = "microshift-selinux"
version = "*"

[[packages]]
name = "microshift-low-latency"
version = "*"

# Kernel RT is only available for x86_64
[customizations.kernel]
name = "kernel-rt"

[customizations.services]
enabled = ["microshift", "microshift-tuned"]

[customizations.firewall]
ports = ["22:tcp", "80:tcp", "443:tcp", "5353:udp", "6443:tcp", "30000-32767:tcp", "30000-32767:udp"]

[customizations.firewall.services]
enabled = ["mdns", "ssh", "http", "https"]

[[customizations.firewall.zones]]
name = "trusted"
sources = ["10.42.0.0/16", "169.254.169.1"]

[[customizations.files]]
path = "/etc/microshift/config.yaml"
data = """
kubelet:
  cpuManagerPolicy: static
  cpuManagerPolicyOptions:
    full-pcpus-only: "true"
  cpuManagerReconcilePeriod: 5s
  memoryManagerPolicy: Static
  topologyManagerPolicy: single-numa-node
  reservedSystemCPUs: 0-1
  reservedMemory:
  - limits:
      memory: 1100Mi
    numaNode: 0
  kubeReserved:
    memory: 500Mi
  systemReserved:
    memory: 500Mi
  evictionHard:
    imagefs.available: 15%
    memory.available: 100Mi
    nodefs.available: 10%
    nodefs.inodesFree: 5%
  evictionPressureTransitionPeriod: 5m
"""

[[customizations.files]]
path = "/etc/tuned/microshift-baseline-variables.conf"
data = """
# Isolated cores should be complementary to the kubelet configuration reserved CPUs.
# Isolated and reserved CPUs must contain all online CPUs.
# Core #3 is for testing offlining, therefore it is skipped.
isolated_cores=2,4-5
hugepages_size=2M
hugepages=10
additional_args=test1=on test2=true dummy
offline_cpu_set=3
"""

[[customizations.files]]
path = "/etc/microshift/tuned.yaml"
data = """
profile: microshift-baseline
reboot_after_apply: True
"""