OpenShift agent single node custom partitions

98-lso-partition.bu

variant: openshift
version: 4.15.0
metadata:
  labels:
    machineconfiguration.openshift.io/role: master
  name: 98-lso-partition
storage:
  disks:
  - device: /dev/sda # This can also be written as /dev/sda or /dev/nvme0n1 if you know the name of the disk device itself. It's recommended to use by-id in case the device changes names but not required. Make sure this matches what is in the install-config.yaml device
    partitions:
    - label: lso
      start_mib: 150000  # let CoreOS use the first 150GB (minimum 25000 MiB, recommend 120000 MiB or more)
      size_mib: 0        # any size, or "0" to use the rest of the disk
      number: 5
  filesystems:
    - device: /dev/disk/by-partlabel/lso
      path: /lso
      format: xfs
      mount_options: [defaults, prjquota] 
      with_mount_unit: true

98-lso-partition.yaml

# Generated by Butane; do not edit
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  labels:
    machineconfiguration.openshift.io/role: master
  name: 98-lso-partition
spec:
  config:
    ignition:
      version: 3.4.0
    storage:
      disks:
        - device: /dev/sda
          partitions:
            - label: lso
              number: 5
              sizeMiB: 0
              startMiB: 150000
      filesystems:
        - device: /dev/disk/by-partlabel/lso
          format: xfs
          mountOptions:
            - defaults
            - prjquota
          path: /lso
    systemd:
      units:
        - contents: |-
            # Generated by Butane
            [Unit]
            Requires=systemd-fsck@dev-disk-by\x2dpartlabel-lso.service
            After=systemd-fsck@dev-disk-by\x2dpartlabel-lso.service

            [Mount]
            Where=/lso
            What=/dev/disk/by-partlabel/lso
            Type=xfs
            Options=defaults,prjquota

            [Install]
            RequiredBy=local-fs.target
          enabled: true
          name: lso.mount

snow_custom_partitions.sh

#!/bin/bash

# This can also be written as /dev/sda or /dev/nvme0n1 if you know the name of the disk device itself.
# It's recommended to use by-id in case the device changes names but not required.
DEVICE="/dev/sda"

rm -rf ocp4
mkdir ocp4
cp install-config.yaml ocp4/
cp agent-config.yaml ocp4/

openshift-install-4.15.8 agent create cluster-manifests --dir=./ocp4 --log-level=debug

# with the agent installer we have to create this subdirectory for custom manifests manually
mkdir ocp4/openshift || true

# Create the custom disk partition manifest
butane 98-lso-partition.bu -o ocp4/openshift/98-lso-partition.yaml

# Create the agent installer ISO image
openshift-install-4.15.8 agent create image --dir=./ocp4 --log-level=debug

#isohybrid --uefi