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Chapter 5. Finalize Networking Settings

At this point, you should have completed the necessary settings to assign ports properly on HCI nodes for either Pure or HCI deployments. This configuration was described in either Section 3.1, “Pure HCI” or Section 3.2.2, “Configuring Port Assignments for the Custom Role”.

However, for both Pure and Mixed HCI deployments you still need to map the StorageMgmtPort to a physical NIC. To do this:

  1. From the default Heat template collection, choose the Compute NIC configuration template suitable for your environment:

    • /usr/share/openstack-tripleo-heat-templates/network/config/single-nic-vlans/compute.yaml
    • /usr/share/openstack-tripleo-heat-templates/network/config/single-nic-linux-bridge-vlans/compute.yaml
    • /usr/share/openstack-tripleo-heat-templates/network/config/multiple-nics/compute.yaml
    • /usr/share/openstack-tripleo-heat-templates/network/config/bond-with-vlans/compute.yaml

      See the on each template’s respective directory for details about the NIC configuration.

  2. Create a new directory within ~/templates called nic-configs and then copy your chosen template to ~/templates/nic-configs/.
  3. Ensure the following definition is in the parameters: section of your new ~/templates/nic-configs/compute.yaml template:

        default: 40
        description: Vlan ID for the storage mgmt network traffic.
        type: number

    Add the definition if it does not already exist (as is with …​/single-nic-vlans/compute.yaml).

  4. Map StorageMgmtNetworkVlanID to a specific NIC on each HCI node. For example, if you chose to trunk VLANs to a single NIC (that is, you copied …​/single-nic-vlans/compute.yaml), then add the following entry to the network_config: section of ~/templates/nic-configs/compute.yaml:

                  type: vlan
                  device: em2
                  mtu: 9000  # 1
                  use_dhcp: false
                  vlan_id: {get_param: StorageMgmtNetworkVlanID}
                      ip_netmask: {get_param: StorageMgmtIpSubnet}
    When mapping a NIC to StorageMgmtNetworkVlanID, we recommend that you set the mtu to 9000 (jumbo frames). This MTU setting provides measurable performance improvement to the performance of Ceph. See Configure MTU Settings in Director (from the Networking Guide) and Configuring Jumbo Frames (from Advanced Overcloud Customization) for related details.
  5. Create a networking environment file — namely, ~/templates/network.yaml. This file should contain the following:

     OS::TripleO::Compute::Net::SoftwareConfig: /home/stack/templates/nic-configs/compute.yaml

    This file will be used later to invoke the customized Compute NIC template (~/templates/nic-configs/compute.yaml) during overcloud deployment (in Chapter 6, Deployment).

You can use ~/templates/network.yaml to define any networking-related parameters or add any customized networking Heat templates. See Creating a Network Environment File from Advanced Overcloud Customization for more details.