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Adopting the data plane

Adopting the Red Hat OpenStack Services on OpenShift (RHOSO) data plane involves the following steps:

Stop any remaining services on the Red Hat OpenStack Platform (RHOSP) 17.1 control plane.
Deploy the required custom resources.
Perform a fast-forward upgrade on Compute services from RHOSP 17.1 to RHOSO 18.0.
If applicable, adopt Networker nodes to the RHOSO data plane.

After the RHOSO control plane manages the newly deployed data plane, you must not re-enable services on the RHOSP 17.1 control plane and data plane. If you re-enable services, workloads are managed by two control planes or two data planes, resulting in data corruption, loss of control of existing workloads, inability to start new workloads, or other issues.

Stopping infrastructure management and Compute services

You must stop cloud Controller nodes, database nodes, and messaging nodes on the Red Hat OpenStack Platform 17.1 control plane. Do not stop nodes that are running the Compute, Storage, or Networker roles on the control plane.

The following procedure applies to a single node standalone director deployment. You must remove conflicting repositories and packages from your Compute hosts, so that you can install libvirt packages when these hosts are adopted as data plane nodes, where modular libvirt daemons are no longer running in podman containers.

Prerequisites

Define the shell variables. Replace the following example values with values that apply to your environment:

EDPM_PRIVATEKEY_PATH="/home/lab-user/.ssh/my-guidkey.pem"
declare -A computes
computes=(
  ["compute02.localdomain"]="172.22.0.110"
  ["compute03.localdomain"]="172.22.0.112"
)

Remove the conflicting repositories and packages from all Compute hosts:

PacemakerResourcesToStop=(
                "galera-bundle"
                "haproxy-bundle"
                "rabbitmq-bundle")

echo "Stopping pacemaker services"
for i in {1..3}; do
    SSH_CMD=CONTROLLER${i}_SSH
    if [ ! -z "${!SSH_CMD}" ]; then
        echo "Using controller $i to run pacemaker commands"
        for resource in ${PacemakerResourcesToStop[*]}; do
            if ${!SSH_CMD} sudo pcs resource config $resource; then
                ${!SSH_CMD} sudo pcs resource disable $resource
            fi
        done
        break
    fi
done

Adopting Compute services to the RHOSO data plane

Adopt your Compute (nova) services to the Red Hat OpenStack Services on OpenShift (RHOSO) data plane.

Prerequisites

You have stopped the remaining control plane nodes, repositories, and packages on the Compute service (nova) hosts. For more information, see Stopping infrastructure management and Compute services.

In the bastion, create the dataplane network (IPAM):

cd /home/lab-user/labrepo/content/files/
oc apply -f osp-ng-dataplane-netconfig-adoption.yaml

Get the libvirt secret password:

LIBVIRT_PASSWORD=$(cat ~/tripleo-standalone-passwords.yaml | grep ' LibvirtTLSPassword:' | awk -F ': ' '{ print $2; }')
LIBVIRT_PASSWORD_BASE64=$(echo -n "$LIBVIRT_PASSWORD" | base64)

Create the libvirt secret:

oc apply -f - <<EOF
apiVersion: v1
kind: Secret
metadata:
  name: libvirt-secret
  namespace: openstack
type: Opaque
data:
  LibvirtPassword: ${LIBVIRT_PASSWORD_BASE64}
EOF

You have defined the shell variables to run the script that runs the fast-forward upgrade:

PODIFIED_DB_ROOT_PASSWORD=$(oc get -o json secret/osp-secret | jq -r .data.DbRootPassword | base64 -d)

alias openstack="oc exec -t openstackclient -- openstack"
declare -A computes
computes=(
  ["compute02.localdomain"]="172.22.0.110"
  ["compute03.localdomain"]="172.22.0.112"
)

Procedure

Create an SSH authentication secret for the data plane nodes:

oc create secret generic dataplane-ansible-ssh-private-key-secret \
--save-config \
--dry-run=client \
--from-file=authorized_keys=/home/lab-user/.ssh/my-guidkey.pub \
--from-file=ssh-privatekey=/home/lab-user/.ssh/my-guidkey.pem \
--from-file=ssh-publickey=/home/lab-user/.ssh/my-guidkey.pub \
-n openstack \
-o yaml | oc apply -f-

Replace /home/lab-user/.ssh/my-guidkey.pem with the path to your SSH key.

Generate an ssh key-pair nova-migration-ssh-key secret:

cd "$(mktemp -d)"
ssh-keygen -f ./id -t ecdsa-sha2-nistp521 -N ''
oc get secret nova-migration-ssh-key || oc create secret generic nova-migration-ssh-key \
  -n openstack \
  --from-file=ssh-privatekey=id \
  --from-file=ssh-publickey=id.pub \
  --type kubernetes.io/ssh-auth
rm -f id*
cd -

As we use a local storage back end for libvirt, create a nova-compute-extra-config service to remove pre-fast-forward workarounds and configure Compute services to use a local storage back end:

cat << EOF | oc apply -f -
apiVersion: v1
kind: ConfigMap
metadata:
  name: nova-extra-config
  namespace: openstack
data:
  19-nova-compute-cell1-workarounds.conf: |
    [workarounds]
    disable_compute_service_check_for_ffu=true
EOF

The secret nova-cell<X>-compute-config auto-generates for each cell<X>. You must specify values for the nova-cell<X>-compute-config and nova-migration-ssh-key parameters for each custom OpenStackDataPlaneService CR that is related to the Compute service.

The resources in the ConfigMap contain cell-specific configurations.

Create a secret for the subscription manager:
```
oc create secret generic subscription-manager \
--from-literal rhc_auth='{"login": {"username": "<subscription_manager_username>", "password": "<subscription_manager_password>"}}'
```
- Replace <subscription_manager_username> with the applicable user name.
- Replace <subscription_manager_password> with the applicable password.

Create a secret for the Red Hat registry:

oc create secret generic redhat-registry \
--from-literal edpm_container_registry_logins='{"registry.redhat.io": {"<registry_username>": "<registry_password>"}}'

Replace <registry_username> with the applicable user name.
Replace <registry_password> with the applicable password.

Create the OpenStackDataPlaneNodeSet CR:
```
oc apply -f osp-ng-dataplane-node-set-deploy-adoption-compute.yaml
```
- Take some time to go through the osp-ng-dataplane-node-set-deploy-adoption-compute.yaml file. We have configured the edpm_ovn_bridge_mappings with "datacentre:br-ex"

Run the pre-adoption validation:

Create the validation service:

cat << EOF | oc apply -f -
apiVersion: dataplane.openstack.org/v1beta1
kind: OpenStackDataPlaneService
metadata:
  name: pre-adoption-validation
spec:
  playbook: osp.edpm.pre_adoption_validation
EOF

Create a OpenStackDataPlaneDeployment CR that runs only the validation:

cat << EOF | oc apply -f -
apiVersion: dataplane.openstack.org/v1beta1
kind: OpenStackDataPlaneDeployment
metadata:
  name: openstack-pre-adoption
spec:
  nodeSets:
  - compute
  servicesOverride:
  - pre-adoption-validation
EOF

When the validation is finished, confirm that the status of the Ansible EE pods is Completed:

watch oc get pod -l app=openstackansibleee

oc logs -l app=openstackansibleee -f --max-log-requests 20

Wait for the deployment to reach the Ready status:

oc wait --for condition=Ready openstackdataplanedeployment/openstack-pre-adoption --timeout=10m

If any openstack-pre-adoption validations fail, you must reference the Ansible logs to determine which ones were unsuccessful, and then try the following troubleshooting options:

If the hostname validation failed, check that the hostname of the data plane node is correctly listed in the OpenStackDataPlaneNodeSet CR.
If the kernel argument check failed, ensure that the kernel argument configuration in the edpm_kernel_args and edpm_kernel_hugepages variables in the OpenStackDataPlaneNodeSet CR is the same as the kernel argument configuration that you used in the Red Hat OpenStack Platform (RHOSP) 17.1 node.
If the tuned profile check failed, ensure that the edpm_tuned_profile variable in the OpenStackDataPlaneNodeSet CR is configured to use the same profile as the one set on the RHOSP 17.1 node.

Remove the remaining director services:

Create an OpenStackDataPlaneService CR to clean up the data plane services you are adopting:

cat << EOF | oc apply -f -
apiVersion: dataplane.openstack.org/v1beta1
kind: OpenStackDataPlaneService
metadata:
  name: tripleo-cleanup
spec:
  playbook: osp.edpm.tripleo_cleanup
EOF

Create the OpenStackDataPlaneDeployment CR to run the clean-up:

cat << EOF | oc apply -f -
apiVersion: dataplane.openstack.org/v1beta1
kind: OpenStackDataPlaneDeployment
metadata:
  name: tripleo-cleanup
spec:
  nodeSets:
  - compute2-3-set
  servicesOverride:
  - tripleo-cleanup
EOF

When the clean-up is finished, deploy the OpenStackDataPlaneDeployment CR:

cat << EOF | oc apply -f -
apiVersion: dataplane.openstack.org/v1beta1
kind: OpenStackDataPlaneDeployment
metadata:
  name: compute-adoption
spec:
  nodeSets:
  - compute2-3-set
EOF

Confirm that all the Ansible EE pods reach a Completed status:

watch oc get pod -l app=openstackansibleee

oc logs -l app=openstackansibleee -f --max-log-requests 20

Wait for the data plane node set to reach the Ready status:

oc wait --for condition=Ready osdpns/compute-adoption --timeout=30m

Verify that the Networking service (neutron) agents are running:

oc exec openstackclient -- openstack network agent list
+--------------------------------------+------------------------------+------------------------+-------------------+-------+-------+----------------------------+
| ID                                   | Agent Type                   | Host                   | Availability Zone | Alive | State | Binary                     |
+--------------------------------------+------------------------------+------------------------+-------------------+-------+-------+----------------------------+
| 174fc099-5cc9-4348-b8fc-59ed44fcfb0e | DHCP agent                   | standalone.localdomain | nova              | :-)   | UP    | neutron-dhcp-agent         |
| 10482583-2130-5b0d-958f-3430da21b929 | OVN Metadata agent           | standalone.localdomain |                   | :-)   | UP    | neutron-ovn-metadata-agent |
| a4f1b584-16f1-4937-b2b0-28102a3f6eaa | OVN Controller agent         | standalone.localdomain |                   | :-)   | UP    | ovn-controller             |
+--------------------------------------+------------------------------+------------------------+-------------------+-------+-------+----------------------------+

Next steps

You must perform a fast-forward upgrade on your Compute services. For more information, see Performing a fast-forward upgrade on Compute services.

Performing a fast-forward upgrade on Compute services

You must upgrade the Compute services from Red Hat OpenStack Platform 17.1 to Red Hat OpenStack Services on OpenShift (RHOSO) 18.0 on the control plane and data plane by completing the following tasks:

Update the cell1 Compute data plane services version.
Remove pre-fast-forward upgrade workarounds from the Compute control plane services and Compute data plane services.
Run Compute database online migrations to update live data.

Procedure

Wait for cell1 Compute data plane services version to update:

oc exec openstack-cell1-galera-0 -c galera -- mysql -rs -uroot -p$PODIFIED_DB_ROOT_PASSWORD \
    -e "select a.version from nova_cell1.services a join nova_cell1.services b where a.version!=b.version and a.binary='nova-compute' and a.deleted=0;"

The query returns an empty result when the update is completed. No downtime is expected for virtual machine workloads.

Review any errors in the nova Compute agent logs on the data plane, and the nova-conductor journal records on the control plane.

Patch the OpenStackControlPlane CR to remove the pre-fast-forward upgrade workarounds from the Compute control plane services:

oc patch openstackcontrolplane openstack -n openstack --type=merge --patch '
spec:
  nova:
    template:
      cellTemplates:
        cell0:
          conductorServiceTemplate:
            customServiceConfig: |
              [workarounds]
              disable_compute_service_check_for_ffu=false
        cell1:
          metadataServiceTemplate:
            customServiceConfig: |
              [workarounds]
              disable_compute_service_check_for_ffu=false
          conductorServiceTemplate:
            customServiceConfig: |
              [workarounds]
              disable_compute_service_check_for_ffu=false
      apiServiceTemplate:
        customServiceConfig: |
          [workarounds]
          disable_compute_service_check_for_ffu=false
      metadataServiceTemplate:
        customServiceConfig: |
          [workarounds]
          disable_compute_service_check_for_ffu=false
      schedulerServiceTemplate:
        customServiceConfig: |
          [workarounds]
          disable_compute_service_check_for_ffu=false
'

Wait until the Compute control plane services CRs are ready:
```
oc wait --for condition=Ready --timeout=300s Nova/nova
```
Complete the steps in Adopting Compute services to the RHOSO data plane.

Remove the pre-fast-forward upgrade workarounds from the Compute data plane services:

cat << EOF | oc apply -f -
apiVersion: v1
kind: ConfigMap
metadata:
  name: nova-extra-config
  namespace: openstack
data:
  20-nova-compute-cell1-workarounds.conf: |
    [workarounds]
    disable_compute_service_check_for_ffu=false
---
apiVersion: dataplane.openstack.org/v1beta1
kind: OpenStackDataPlaneDeployment
metadata:
  name: openstack-nova-compute-ffu
  namespace: openstack
spec:
  nodeSets:
    - openstack-edpm-compute-2
  servicesOverride:
    - nova
EOF

The service included in the servicesOverride key must match the name of the service that you included in the OpenStackDataPlaneNodeSet CR. For example, if you use a custom service called nova-custom, ensure that you add it to the servicesOverride key.

Wait for the Compute data plane services to be ready:

oc wait --for condition=Ready openstackdataplanedeployment/openstack-nova-compute-ffu --timeout=5m

Run Compute database online migrations to complete the fast-forward upgrade:

oc exec -it nova-cell0-conductor-0 -- nova-manage db online_data_migrations
oc exec -it nova-cell1-conductor-0 -- nova-manage db online_data_migrations

Verification

Discover the Compute hosts in the cell:

oc rsh nova-cell0-conductor-0 nova-manage cell_v2 discover_hosts --verbose

Verify if the existing test VM instance is running:

${BASH_ALIASES[openstack]} server --os-compute-api-version 2.48 show --diagnostics test-server 2>&1 || echo FAIL

Verify if the Compute services can stop the existing test VM instance:

${BASH_ALIASES[openstack]} server list -c Name -c Status -f value | grep -qF "test ACTIVE" && ${BASH_ALIASES[openstack]} server stop test || echo PASS
${BASH_ALIASES[openstack]} server list -c Name -c Status -f value | grep -qF "test SHUTOFF" || echo FAIL
${BASH_ALIASES[openstack]} server --os-compute-api-version 2.48 show --diagnostics test 2>&1 || echo PASS

Verify if the Compute services can start the existing test VM instance:

${BASH_ALIASES[openstack]} server list -c Name -c Status -f value | grep -qF "test SHUTOFF" && ${BASH_ALIASES[openstack]} server start test || echo PASS
${BASH_ALIASES[openstack]} server list -c Name -c Status -f value | grep -qF "test ACTIVE" && \
  ${BASH_ALIASES[openstack]} server --os-compute-api-version 2.48 show --diagnostics test --fit-width -f json | jq -r '.state' | grep running || echo FAIL

After the data plane adoption, the Compute hosts continue to run Red Hat Enterprise Linux (RHEL) 9.2. To take advantage of RHEL 9.4, perform a minor update procedure after finishing the adoption procedure.