Networking Version 2 (Two)

Introduction

In the the Wallaby cycle TripleO Networking has been refactored so that no OS::Neutron heat resources are used. This was a pre-requisite for Ephemeral Heat. Managing non-ephemeral neutron resources with an ephemeral heat stack is not feasible, so the management of neutron resources has been externalized from the overcloud heat stack.

High level overview of the changes

• NIC config templates was migrated to ansible j2 templates during the Victoria release. Replacing the heat templates previously used for NIC configuration. Sample ansible j2 templates are available in the tripleo-ansible git repository as well as in /usr/share/ansible/roles/tripleo_network_config/templates/ on a deployed undercloud.

  Please refer to Creating Custom Interface Templates on the Configuring Network Isolation documentation page for further details on writing custom Ansible j2 NIC config templates.

• A new schema for the network definitions used for Jinja2 rendering of the tripleo-heat-templates was introduced, in addition to tripleoclient commands to provision networks using the new network definitions schema.

• A new schema for network Virtual IPs was introduced in conjunction with tripleoclient commands to provision the Virtual IPs.

• Service Virtual IPs (redis and ovsdb) was refactored so that the neutron resources are created by the deploy-steps playbook post-stack create/update.

• The baremetal provisioning schema was extended to include advanced network layouts. The overcloud node provision command was extended so that it also provision neutron port resources for all networks defined for instances/ roles in the baremetal provisioning definition.

• The tool (tripleo-ansible-inventory) used to generate the ansible inventory was extended to use neutron as a source for the inventory in addition to the overcloud heat stack outputs.

• With the TripleO ansible inventory’s support to use neutron resources as a data source, the baremetal provisioning schema and overcloud node provision command was extended to allow arbitrary playbook execute against the provisioned nodes, as well as applying node network configuration utilizing the tripleo_network_config ansible role and the ansible j2 NIC config templates.

With all of the above in place the overcloud deploy command was extended so that it can run all the steps:

1. Create Networks

   Run the cli-overcloud-network-provision.yaml ansible playbook using the network definitions provided via the --network-file argument. This playbook creates/updates the neutron networks on the undercloud and generates the networks-deployed.yaml environment file which is included as a user-environment when creating the overcloud heat stack.

2. Create Virtual IPs

   Run the cli-overcloud-network-vip-provision.yaml ansible playbook using the Virtual IP definitions provided via the --vip-file argument. This playbook creates/updates the Virtual IP port resources in neutron on the undercloud and generates the virtual-ips-deployed.yaml environment file which is included as a user-environment when creating the overcloud heat stack.

3. Provision Baremetal Instances

   Run the cli-overcloud-node-provision.yaml ansible playbook using the baremetal instance definitions provided via the --baremetal-deployment argument in combination with the --network-config argument so that baremetal nodes are provisioned and network port resources are created. Also run any arbitrary Ansible playbooks provided by the user on the provisioned nodes before finally configured overcloud node networking using the tripleo_network_config ansible role.

4. Create the overcloud Ephemeral Heat stack

   The environment files with the parameters and resource registry overrides required is automatically included when the overcloud deploy command is run with the arguments: --vip-file, --baremetal-deployement and --network-config.

5. Run Config-Download and the deploy-steps playbook

   As an external deploy step the neutron ports for Service Virtual IPs are created, and the properties of the Virtual IPs are included in hieradata.

   Ceph

   Optionally Ceph may be deployed after the baremetal instances are provisioned but before the ephemeral Heat stack is created as described in Deployed Ceph.

Using

Pre-Provision networks

The command to pre-provision networks for one or more overcloud stack(s) is openstack overcloud network provision. The command takes a network-v2 version networks definitions YAML file as input, and writes a heat environment file to the file specified using the --output argument.

Please refer to the Network data YAML options reference section on the Deploying with Custom Networks document page for a reference on available options in the network data YAML schema.

Sample network definition YAML files can be located in the tripleo-heat-templates git repository, or in the /usr/share/openstack-tripleo-heat-templates/network-data-samples directory on the undercloud.

Example: Networks definition YAML file defining the external network.

- name: External
  name_lower: external
  vip: true
  mtu: 1500
  subnets:
    external_subnet:
      ip_subnet: 10.0.0.0/24
      allocation_pools:
        - start: 10.0.0.4
          end: 10.0.0.250
      gateway_ip: 10.0.0.1
      vlan: 10

Example: Create or update networks

$ openstack overcloud network provision \
    --output ~/overcloud-networks-deployed.yaml \
    ~/network_data_v2.yaml

When deploying the overcloud include the environment file generated by the overcloud network provision command.

$ openstack overcloud deploy --templates \
    -e ~/overcloud-networks-deployed.yaml

Pre-Provision network Virtual IPs

The command to pre-provision Virtual IPs for an overcloud stack is: openstack overcloud network vip provision. The command takes a Virtual IPs definitions YAML file as input, and writes a heat environment file to the file specified using the --output argument. The --stack argument defines the name of the overcloud stack for which Virtual IPs will be provisioned.

Please refer to the Network Virtual IPs data YAML options reference section on the Deploying with Custom Networks document page for a reference on available options in the Virtual IPs YAML schema.

Sample network definition YAML files can be located in the tripleo-heat-templates git repository, or in the /usr/share/openstack-tripleo-heat-templates/network-data-samples directory on the undercloud.

Example: Virtual IPs definition YAML file defining the ctlplane and the external network Virtual IPs.

- network: ctlplane
  dns_name: overcloud
- network: external
  dns_name: overcloud

Example: Create or update Virtual IPs

$ openstack overcloud network vip provision \
    --stack overcloud \
    --output ~/overcloud-vip-deployed.yaml \
    ~/vip_data.yaml

When deploying the overcloud include the environment file generated by the overcloud network provision command. For example:

$ openstack overcloud deploy --templates \
    -e ~/overcloud-vip-deployed.yaml

Service Virtual IPs

Service Virtual IPs are created as needed when the service is enabled. To configure the subnet to use the existing ServiceVipMap heat parameter. For a fixed IP allocation the existing heat parameters RedisVirtualFixedIPs and/or OVNDBsVirtualFixedIPs can be used.

Example: Setting fixed ips:

parameter_defaults:
  RedisVirtualFixedIPs: [{'ip_address': '172.20.0.11'}]
  OVNDBsVirtualFixedIPs: [{'ip_address': '172.20.0.12'}]

Example: Setting fixed IP address and not creating a neutron resource:

parameter_defaults:
  RedisVirtualFixedIPs: [{'ip_address': '172.20.0.11', 'use_neutron': false}]
  OVNDBsVirtualFixedIPs: [{'ip_address': '172.20.0.12', 'use_neutron': false}]

Note

Overriding the Service Virtual IPs using the resource registry entries OS::TripleO::Network::Ports::RedisVipPort and OS::TripleO::Network::Ports::OVNDBsVipPort is no longer supported.

Provision Baremetal Instances

Pre provisioning baremetal instances using Metalsmith has been supported for a while. The TripleO Network v2 work extended the workflow that provision baremetal instances to also provision the neutron network port resources and added the interface to run arbitrary Ansible playbooks after node provisioning.

Please refer to the Provisioning Baremetal Before Overcloud Deploy document page for a reference on available options in the Baremetal Deployment YAML schema.

Example: Baremetal Deployment YAML set up for default the default network-isolation scenario, including one pre-network config Ansible playbook that will be run against the nodes in each role.

- name: Controller
  count: 1
  hostname_format: controller-%index%
  ansible_playbooks:
    - playbook: bm-deploy-playbook.yaml
  defaults:
    profile: control
    networks:
      - network: external
        subnet: external_subnet
      - network: internal_api
        subnet: internal_api_subnet01
      - network: storage
        subnet: storage_subnet01
      - network: storage_mgmt
        subnet: storage_mgmt_subnet01
      - network: tenant
        subnet: tenant_subnet01
    network_config:
      template: templates/multiple_nics/multiple_nics_dvr.j2
      default_route_network:
        - external
- name: Compute
  count: 1
  hostname_format: compute-%index%
  ansible_playbooks:
    - playbook: bm-deploy-playbook.yaml
  defaults:
    profile: compute-leaf2
    networks:
      - network: internal_api
        subnet: internal_api_subnet02
      - network: tenant
        subnet: tenant_subnet02
      - network: storage
        subnet: storage_subnet02
    network_config:
      template: templates/multiple_nics/multiple_nics_dvr.j2

Example: Arbitrary Ansible playbook example bm-deploy-playbook.yaml

- name: Overcloud Node Network Config
  hosts: allovercloud
  any_errors_fatal: true
  gather_facts: false
  tasks:
  - name: A task
    debug:
      msg: "A message"

To provision baremetal nodes, create neuron port resource and apply network configuration as defined in the above definition run the openstack overcloud node provision command including the --network-config argument as shown in the below example:

$ openstack overcloud node provision \
    --stack overcloud \
    --network-config \
    --output ~/overcloud-baremetal-deployed.yaml \
    ~/baremetal_deployment.yaml

When deploying the overcloud include the environment file generated by the overcloud node provision command and enable the --deployed-server argument.

$ openstack overcloud deploy --templates \
    --deployed-server \
    -e ~/overcloud-baremetal-deployed.yaml

The All-in-One alternative using overcloud deploy command

It is possible to instruct the openstack overcloud deploy command to do all of the above steps in one go. The same YAML definitions can be used and the environment files will be automatically included.

Example: Use the All-in-One deploy command:

$ openstack overcloud deploy \
    --templates \
    --stack overcloud \
    --network-config \
    --deployed-server \
    --roles-file ~/my_roles_data.yaml \
    --networks-file ~/network_data_v2.yaml \
    --vip-file ~/vip_data.yaml \
    --baremetal-deployment ~/baremetal_deployment.yaml

Managing Multiple Overclouds

When managing multiple overclouds using a single undercloud one would have to use a different --stack name and --output as well as per-overcloud YAML definitions for provisioning Virtual IPs and baremetal nodes.

Networks can be shared, or separate for each overcloud stack. If they are shared, use the same network definition YAML and deployed network environment for all stacks. In the case where networks are not shared, a separate network definitions YAML and a separate deployed network environment file must be used by each stack.

Note

The ctlplane provisioning network will always be shared.

Migrating existing deployments

To facilitate the migration for deployed overclouds tripleoclient commands to extract information from deployed overcloud stacks has been added. During the upgrade to Wallaby these tools will be executed as part of the underlcoud upgrade, placing the generated YAML definition files in the working directory (Defaults to: ~/overcloud-deploy/$STACK_NAME/). Below each export command is described, and examples to use them manually with the intent for developers and operators to be able to better understand what happens “under the hood” during the undercloud upgrade.

There is also a tool convert_heat_nic_config_to_ansible_j2.py that can be used to convert heat template NIC config to Ansible j2 templates.

Warning

If migrating to use Networking v2 while using the non-Epemeral heat i.e --heat-type installed, the existing overcloud stack must first be updated to set the deletion_policy for OS::Nova and OS::Neutron resources. This can be done using a --stack-only update, including an environment file setting the following tripleo-heat-templates parameters NetworkDeletionPolicy, PortDeletionPolicy and ServerDeletionPolicy to retain.

If the deletion policy is not set to retain the orchestration service will delete the existing resources when an update using the Networking v2 environments is performed.

Conflicting legacy environment files

The heat environment files created by the Networking v2 commands uses resource registry overrides to replace the existing resources with pre-deployed resource types. These resource registry entries was also used by legacy environment files, such as network-isolation.yaml. The legacy files should no longer be used, as they will nullify the new overrides.

It is recommended to compare the generated environment files with existing environment files used with the overcloud deployment prior to the migration and remove all settings that overlap with the settings in the generated environment files.

Convert NIC configs

In the tripleo-heat-templates tools directory there is a script convert_heat_nic_config_to_ansible_j2.py that can be used to convert heat NIC config templates to Ansible j2 NIC config templates.

Example: Convert the compute.yaml heat NIC config template to Ansible j2.

$ /usr/share/openstack-tripleo-heat-templates/convert_heat_nic_config_to_ansible_j2.py \
    --stack overcloud \
    --networks-file network_data.yaml \
    ~/nic-configs/compute.yaml

Warning

The tool does a best-effort to fully automate the conversion. The new Ansible j2 template files should be inspected, there may be a need to manually edit the new Ansible j2 template. The tool will try to highlight any issues that need manual intervention by adding comments in the Ansible j2 file.

The Migrating existing Network Interface Configuration Templates section on the Configuring Network Isolation documentation page provides a guide for manual migration.

Generate Network YAML

The command openstack overcloud network extract can be used to generate a Network definition YAML file from a deployed overcloud stack. The YAML definition file can then be used with openstack overcloud network provision and the openstack overcloud deploy command.

Example: Generate a Network definition YAML for the overcloud stack:

$ openstack overcloud network extract \
    --stack overcloud \
    --output ~/network_data_v2.yaml

Generate Virtual IPs YAML

The command openstack overcloud network vip extract can be used to generate a Virtual IPs definition YAML file from a deployed overcloud stack. The YAML definition file can then be used with openstack overcloud network vip provision command and/or the openstack overcloud deploy command.

Example: Generate a Virtual IPs definition YAML for the overcloud stack:

$ openstack overcloud network vip extract \
    --stack overcloud \
    --output /home/centos/overcloud/network_vips_data.yaml

Generate Baremetal Provision YAML

The command openstack overcloud node extract provisioned can be used to generate a Baremetal Provision definition YAML file from a deployed overcloud stack. The YAML definition file can then be used with openstack overcloud node provision command and/or the openstack overcloud deploy command.

Example: Export deployed overcloud nodes to Baremtal Deployment YAML definition

$ openstack overcloud node extract provisioned \
    --stack overcloud \
    --roles-file ~/tht_roles_data.yaml \
    --output ~/baremetal_deployment.yaml