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Bare Metal Platform Customization

Cluster-scoped properties

Advanced Configuration Parameters

Parameter Default Description
libvirtURI qemu://localhost/system The location of the hypervisor for running the bootstrap VM. See Using a Remote Hypervisor for more details.
clusterProvisioningIP The third address on the provisioning network. 172.22.0.3 The IP within the cluster where the provisioning services run.
bootstrapProvisioningIP The second address on the provisioning network. 172.22.0.2 The IP on the bootstrap VM where the provisioning services run while the control plane is being deployed.
externalBridge baremetal The name of the bridge of the hypervisor attached to the external network.
externalMACAddress `` A MAC address to use for the external NIC on the bootstrap VM. This is optional and if blank is generated by libvirt.
provisioningBridge provisioning The name of the bridge on the hypervisor attached to the provisioning network.
provisioningMACAddress `` A MAC address to use for the provisioning NIC on the bootstrap VM. This is optional and if blank is generated by libvirt.
provisioningNetworkCIDR 172.22.0.0/24 The CIDR for the network to use for provisioning.
provisioningDHCPExternal false Flag indicating that DHCP for the provisioning network is managed outside of the cluster by existing infrastructure services.
provisioningDHCPRange The tenth through the second last IP on the provisioning network. 172.22.0.10,172.22.0.254 The IP range to use for hosts on the provisioning network.
defaultMachinePlatform The default configuration used for machine pools without a platform configuration.
bootstrapOSImage based on the release image A URL to override the default operating system image for the bootstrap node. The URL must contain a sha256 hash of the image. Example https://mirror.example.com/images/qemu.qcow2.gz?sha256=a07bd...
clusterOSImage based on the release image A URL to override the default operating system for cluster nodes. The URL must include a sha256 hash of the image. Example https://mirror.example.com/images/metal.qcow2.gz?sha256=3b5a8...

Image Overrides

When doing a disconnected installation, the baremetal platform has the additional requirement that we have locations to download the RHCOS images. The installer downloads these from a CoreOS stream metadata embedded in the installer code, but they can be overridden to point to a local mirror.

See CoreOS bootimages for more information about bootimages.

The SHA256 parameter in the URL is required, and should match the uncompressed SHA256 from the stream metadata JSON.

  • bootstrapOSImage (optional string): Override the image used for the bootstrap virtual machine.
  • clusterOSImage (optional string): Override the image used for cluster machines.

Example:

platform:
  baremetal:
      bootstrapOSImage: http://mirror.example.com/images/rhcos-43.81.201912131630.0-qemu.x86_64.qcow2.gz?sha256=f40e826ac4a6c5c073416a7bc0039ec8726a338885d2031e7607cec8783e580e
      clusterOSImage: http://mirror.example.com/images/rhcos-43.81.201912131630.0-openstack.x86_64.qcow2.gz?sha256=ffebbd68e8a1f2a245ca19522c16c86f67f9ac8e4e0c1f0a812b068b16f7265d

Networking customization

By default, the baremetal IPI environment uses a provisioning network of 172.22.0.0/24, picks the 2nd and 3rd address of that subnet for the bootstrap and cluster provisioning IP's, and operates an internal DHCP and TFTP server in the cluster to support provisioning. Much of this can be customized.

  • provisioningNetorkCIDR (optional string): Override the default provisioning network.
  • bootstrapProvisioningIP (optional string): Override the bootstrap provisioning IP. If unspecified, uses the 2nd address in the provisioning network's subnet.
  • clusterProvisioningIP (optional string): Override the IP used by the cluster's provisioning infrastructure. If unspecified, uses the 3rd address in the provisioning network's subnet.

Example:

platform:
  baremetal:
    provisioningNetworkCIDR: 172.23.0.0/16
    bootstrapProvisioningIP: 172.23.0.2
    clusterProvisioningIP: 172.23.0.3
  • provisioningDHCPRange (optional string): By default, the installer picks a range from the 10th to the second from last address. To use a different range, specify this using the provisioningDHCPRange option in the baremetal platform. This should be a comma-separated list indicating the start and end range.

Example:

platform:
  baremetal:
    provisioningDHCPRange: "172.23.0.10,172.23.0.254"
  • provisioningDHCPExternal (optional boolean): If you would prefer to use an external DHCP server, you can specify provisioningDHCPExternal, in which case the cluster will only run TFTP. When using PXE boot for the control plane and workers, your DHCP server needs to specify the next-server as bootstrapProvisioningIP for the control plane, and clusterProvisioningIP for the workers.

Example:

platform:
  baremetal:
    provisioningDHCPExternal: true

Using a Remote Hypervisor

The IPI installation process requires access to a libvirt-based hypervisor host on which to run a bootstrap VM. The VM is removed after the control plane is up and fully functional, so the hypervisor is not needed to operate the cluster. When running the installer by hand, it is most common to use the local host as the hypervisor. When network topology requires, it is possible to use a separate host.

The libvirtURI can be used to specify the location of the remote hypervisor. For example qemu+ssh://[email protected]/system tells the installer to connect to hypervisor.example.com over ssh as the hyperuser user and create the bootstrap VM there.

The user on the host running the installer must be able to connect via ssh to the hypervisor using the username given in the URI, without being prompted for a password.

The user on the hypervisor must be in the libvirt group and have permission to communicate with the libvirt services.

The hypervisor must meet the network requirements described in the Prerequisites section.

Example:

platform:
  baremetal:
    libvirtURI: qemu+ssh://[email protected]/system

Disabling Certificate Verification for BMCs

By default TLS clients communicating with BMCs will require valid certificates signed by a known certificate authority. In environments where certificates are signed by unknown authorities, this behavior can be disabled by setting disableCertificateVerification to true for each bmc entry.

Shift to external load balancer post deployment

The following link describes how to move external api/ingress traffic from the default self-hosted load balancer to another load balancer.