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Deploy Multi Node OpenShift Hybrid in ScaleLab

This guide describes how to deploy a hybrid Multi Node OpenShift (MNO) cluster in ScaleLab: some nodes are bare metal and some are virtual machines (VMs).

1. Configure Ansible variables in all.yml

Set up all.yml the same way as for a standard ScaleLab allocation. Then add these variables:

cluster_type: mno           # Use "mno" (not "vmno"). MNO allows bare metal nodes; VMNO does not.
hv_inventory: true
hv_ssh_pass: <hv-password>
hybrid_worker_count: 123    # Total number of VM workers you want.

Why use two phases?
First you install a small cluster and confirm it works. Then you add the VM workers. Doing it in two steps makes it easier to find and fix problems: issues from the first install are separate from issues when creating many VMs.

2. Run the playbooks

Phase 1: Install a small cluster (3 control-plane + 3 workers)

  1. In all.yml, set hybrid_worker_count: 0.
  2. Run the create-inventory.yml playbook.
  3. Run the mno-deploy.yml playbook.
  4. Run the hv-setup.yml playbook.

Phase 2: Add the VM workers

  1. In all.yml, set hybrid_worker_count: 123.
  2. Run the create-inventory.yml playbook.
  3. Open the inventory file at ansible/inventory/cloudXX.local. Check:
    • [worker]: It should list the bare metal workers and the correct number of VMs to create.
    • [hv_vm]: It should list the expected number of VMs with the right CPU, memory, and disk. Confirm how many VMs are assigned to each hypervisor (HV). This ratio is set by machine type in hw_vm_counts in lab.yml.
  4. Run the hv-vm-create.yml playbook. For more about this playbook, see Virtual Multi Node OpenShift.
  5. Run the ocp-scale-out.yml playbook. For more about this playbook, see Scale Out a Multi Node OpenShift Deployment.

Command reference

create-inventory.yml

(.ansible) [root@<bastion> jetlag]# ansible-playbook ansible/create-inventory.yml

hv-setup.yml

(.ansible) [root@<bastion> jetlag]# ansible-playbook -i ansible/inventory/cloud99.local ansible/hv-setup.yml

hv-vm-create.yml

(.ansible) [root@<bastion> jetlag]# ansible-playbook -i ansible/inventory/cloud99.local ansible/hv-vm-create.yml

mno-deploy.yml

(.ansible) [root@<bastion> jetlag]# ansible-playbook -i ansible/inventory/cloud99.local ansible/mno-deploy.yml

ocp-scale-out.yml

(.ansible) [root@<bastion> jetlag]# ansible-playbook -i ansible/inventory/cloud99.local ansible/ocp-scale-out.yml