OCP_iSCSI_for_Trident.sh

#! /usr/bin/env/sh

#
# this script has not been tested nor validated, it is not, in any way
# supported by Red Hat or NetApp. use at your own risk.
#

#
# the purpose of this script is to create an OpenShift MachineConfig
# to apply the NetApp recommended OS configuration to RHCOS machines.
# it does this by creating a shell script on the node, then executing
# the script via a unit file on startup.
#


WORKER_CONFIG=$(cat << EOF | base64 -w0
#! /usr/bin/env sh
#
# refer to Trident documentation for configuration tasks
# https://netapp-trident.readthedocs.io/en/stable-v21.01/kubernetes/operations/tasks/worker.html
# 
# this script is triggered by a boot-time unit file, netapp-ontap-iscsi-config.service
#

# set scanning to manual
sed -i 's/^\(node.session.scan\).*/\1 = manual/' /etc/iscsi/iscsid.conf

# configure multipathd
mpathconf --enable --with_multipathd y

#
# multipathd and iscsi services are enabled by ignition
#
EOF
)

WORKER_MACHINE_CONFIG=$(cat << EOF
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  labels:
    machineconfiguration.openshift.io/role: worker
  name: worker-iscsi-configuration
spec:
  config:
    ignition:
      version: 3.1.0
    storage:
      files:
      - contents:
          source: data:text/plain;charset=utf-8;base64,$WORKER_CONFIG
        filesystem: root
        mode: 493
        path: /usr/local/bin/configure_ontap_iscsi.sh
    systemd:
      units:
        - name: iscsid.service
          enabled: true
        - name: multipathd.service
          enabled: true
        - name: netapp-ontap-iscsi-config.service
          contents: >
            [Unit]
            Description=NetApp ONTAP iSCSI Configuration
            Before=multipathd.service
            Before=iscsid.service
            [Service]
            Type=oneshot
            ExecStart=/bin/bash /usr/local/bin/configure_ontap_iscsi.sh
            [Install]
            WantedBy=multi-user.target
          enabled: true
    osImageURL: ""
EOF
)

echo $WORKER_MACHINE_CONFIG | oc apply -f -