4. Virtual Undercloud VS. Baremetal Undercloud¶
When deploying the overcloud on baremetal nodes, there is the option of using an undercloud deployed on a baremetal machine or creating a virtual machine (VM) on that same baremetal machine and using the VM to serve as the undercloud.
The advantages of using a VM undercloud are:
- The VM can be rebuilt and reinstalled without reprovisioning the entire baremetal machine
- The tripleo-quickstart default workflow is written for a Virtual Environment deployment. Using a VM undercloud requires less customization of the default workflow.
When using a VM undercloud, but baremetal nodes for the overcloud deployment, the overcloud_nodes variable in tripleo-quickstart must overwritten and set to empty.