Chapter 5. Deploying the HCI nodes

Procedure

1. Export stack information from the central stack. You must deploy the control-plane stack before running this command:

       openstack overcloud export \
                 --config-download-dir /var/lib/mistral/central \
                 --stack central \
                 --output-file ~/dcn-common/control-plane-export.yaml \

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Procedure

1. Review the overrides for the distributed compute node (DCN) site in dcn0/overrides.yaml:

   parameter_defaults:
     DistributedComputeHCICount: 3
     DistributedComputeHCIFlavor: baremetal
     DistributedComputeHCISchedulerHints:
       'capabilities:node': '0-ceph-%index%'
     CinderStorageAvailabilityZone: dcn0
     NovaAZAttach: false

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2. Review the proposed Ceph configuration in dcn0/ceph.yaml.

   parameter_defaults:
     CephClusterName: dcn0
     NovaEnableRbdBackend: false
     CephAnsiblePlaybookVerbosity: 3
     CephPoolDefaultPgNum: 256
     CephPoolDefaultSize: 3
     CephAnsibleDisksConfig:
       osd_scenario: lvm
       osd_objectstore: bluestore
       devices:
         - /dev/sda
         - /dev/sdb
         - /dev/sdc
         - /dev/sdd
         - /dev/sde
         - /dev/sdf
         - /dev/sdg
         - /dev/sdh
         - /dev/sdi
         - /dev/sdj
         - /dev/sdk
         - /dev/sdl
   
   ## Everything below this line is for HCI Tuning
     CephAnsibleExtraConfig:
       ceph_osd_docker_cpu_limit: 1
       is_hci: true
     CephConfigOverrides:
       osd_recovery_op_priority: 3
       osd_recovery_max_active: 3
       osd_max_backfills: 1
     ## Set relative to your hardware:
     # DistributedComputeHCIParameters:
     #   NovaReservedHostMemory: 181000
     # DistributedComputeHCIExtraConfig:
     #   nova::cpu_allocation_ratio: 8.2

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   Replace the values for the following parameters with values that suit your environment. For more information, see the Deploying an overcloud with containerized Red Hat Ceph and Hyperconverged Infrastructure guides.

   • CephAnsibleExtraConfig
   • DistributedComputeHCIParameters
   • CephPoolDefaultPgNum
   • CephPoolDefaultSize
   • DistributedComputeHCIExtraConfig

3. Create a new file called nova-az.yaml with the following contents:

   resource_registry:
     OS::TripleO::Services::NovaAZConfig: /usr/share/openstack-tripleo-heat-templates/deployment/nova/nova-az-config.yaml
   parameter_defaults:
     NovaComputeAvailabilityZone: dcn0
     RootStackName: central

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   Provided that the overcloud can access the endpoints that are listed in the centralrc file created by the central deployment, this command creates an AZ called dcn0, with the new HCI Compute nodes added to that AZ during deployment.

4. Run the deploy.sh deployment script for dcn0:

   #!/bin/bash
   STACK=dcn0
   source ~/stackrc
   if [[ ! -e distributed_compute_hci.yaml ]]; then
       openstack overcloud roles generate DistributedComputeHCI -o distributed_compute_hci.yaml
   fi
   time openstack overcloud deploy \
        --stack $STACK \
        --templates /usr/share/openstack-tripleo-heat-templates/ \
        -r distributed_compute_hci.yaml \
        -e /usr/share/openstack-tripleo-heat-templates/environments/disable-telemetry.yaml \
        -e /usr/share/openstack-tripleo-heat-templates/environments/podman.yaml \
        -e /usr/share/openstack-tripleo-heat-templates/environments/ceph-ansible/ceph-ansible.yaml \
        -e /usr/share/openstack-tripleo-heat-templates/environments/cinder-volume-active-active.yaml \
        -e ~/dcn-common/control-plane-export.yaml \
        -e ~/containers-env-file.yaml \
        -e ceph.yaml \
        -e nova-az.yaml \
        -e overrides.yaml

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   When the overcloud deployment finishes, see the post-deployment configuration steps and checks in Chapter 6, Post-deployment configuration.