samples

machine-config.yaml

apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  labels:
    machineconfiguration.openshift.io/role: worker
  name: network-manager-extra-conf-worker
spec:
  config:
    ignition:
      version: 3.1.0
    storage:
      files:
      - contents:
          source: data:;base64,W21haW5dCnJjLW1hbmFnZXI9ZmlsZQpbY29ubmVjdGlvbl0KaXB2Ni5kaGNwLWR1aWQ9bGwKaXB2Ni5kaGNwLWlhaWQ9bWFjCltrZXlmaWxlXQp1bm1hbmFnZWQtZGV2aWNlcz1pbnRlcmZhY2UtbmFtZTplbnAzczBmMQo=
        filesystem: root
        mode: 420
        overwrite: true
        path: /etc/NetworkManager/conf.d/99-onprem-cluster.conf
    systemd:
      units:
      - name: set-hostname.service
        enabled: true
        contents: |
          [Unit]
          Description=Writes IP address configuration so that kubelet and crio services select a valid node IP
          Wants=network-online.target
          After=network-online.target ignition-firstboot-complete.service
          Before=kubelet.service crio.service
          [Service]
          Type=oneshot
          ExecStart=/bin/bash -c "if [[ $(hostname) == *localhost* ]]; then \
             REVERSE=$(dig -x $(hostname -I | cut -f1) +short) ;\
             HOSTNAME=${REVERSE::-1} ;\
             echo $HOSTNAME > /etc/hostname ;\
             nmcli general hostname $HOSTNAME ;\
             systemctl restart systemd-hostnamed ;\
             else echo Hostname properly set; exit 0 ; fi"
          [Install]
          WantedBy=multi-user.target