Bifrost

This section covers configuration of the Bifrost service that runs on the seed host. Bifrost configuration is typically applied in ${KAYOBE_CONFIG_PATH}/bifrost.yml. Consult the Bifrost documentation for further details of Bifrost usage and configuration.

Bifrost installation

Note

This section may be skipped if using an upstream Bifrost container image.

The following options are used if building the Bifrost container image locally.

kolla_bifrost_source_url

URL of Bifrost source code repository. Default is https://opendev.org/openstack/bifrost.

kolla_bifrost_source_version

Version (branch, tag, etc.) of Bifrost source code repository. Default is {{ openstack_branch }}, which is the same as the Kayobe upstream branch name.

For example, to install Bifrost from a custom git repository:

bifrost.yml
kolla_bifrost_source_url: https://git.example.com/bifrost
kolla_bifrost_source_version: downstream

Overcloud root disk image configuration

Note

This configuration only applies when overcloud_dib_build_host_images (set in ${KAYOBE_CONFIG_PATH}/overcloud-dib.yml) is changed to false.

Bifrost uses Diskimage builder (DIB) to build a root disk image that is deployed to overcloud hosts when they are provisioned. The following options configure how this image is built. Consult the Diskimage-builder documentation for further information on building disk images.

The default configuration builds a whole disk (partitioned) image using the selected OS distribution with serial console enabled, and SELinux disabled if CentOS Stream is used. Rocky Linux 9 users should use the default method of building images with Diskimage builder directly.

kolla_bifrost_dib_os_element

DIB base OS element. Default is {{ os_distribution }}.

kolla_bifrost_dib_os_release

DIB image OS release. Default is {{ os_release }}.

kolla_bifrost_dib_elements_default

Added in the Train release. Use kolla_bifrost_dib_elements in earlier releases.

List of default DIB elements. Default is ["disable-selinux", "enable-serial-console", "vm"] when os_distribution is centos or rocky, ["enable-serial-console", "vm"] otherwise. The vm element is poorly named, and causes DIB to build a whole disk image rather than a single partition.

kolla_bifrost_dib_elements_extra

Added in the Train release. Use kolla_bifrost_dib_elements in earlier releases.

List of additional DIB elements. Default is none.

kolla_bifrost_dib_elements

List of DIB elements. Default is a combination of kolla_bifrost_dib_elements_default and kolla_bifrost_dib_elements_extra.

kolla_bifrost_dib_init_element

DIB init element. Default is cloud-init-datasources.

kolla_bifrost_dib_env_vars_default

Added in the Train release. Use kolla_bifrost_dib_env_vars in earlier releases.

DIB default environment variables. Default is {DIB_BOOTLOADER_DEFAULT_CMDLINE: "nofb nomodeset gfxpayload=text net.ifnames=1", "DIB_CLOUD_INIT_DATASOURCES": "ConfigDrive"}.

kolla_bifrost_dib_env_vars_extra

Added in the Train release. Use kolla_bifrost_dib_env_vars in earlier releases.

DIB additional environment variables. Default is none.

kolla_bifrost_dib_env_vars

DIB environment variables. Default is combination of kolla_bifrost_dib_env_vars_default and kolla_bifrost_dib_env_vars_extra.

kolla_bifrost_dib_packages

List of DIB packages to install. Default is to install no extra packages.

The disk image is built during the deployment of seed services. It is worth noting that currently, the image will not be rebuilt if it already exists. To force rebuilding the image, it is necessary to remove the file. On the seed:

docker exec bifrost_deploy rm /httpboot/deployment_image.qcow2

Then on the control host:

(kayobe) $ kayobe seed service deploy

Example: Adding an element

In the following, we extend the list of DIB elements to add the growpart element:

bifrost.yml
kolla_bifrost_dib_elements_extra:
  - "growpart"

Example: Building an XFS root filesystem image

By default, DIB will format the image as ext4. In some cases it might be useful to use XFS, for example when using the overlay Docker storage driver which can reach the maximum number of hardlinks allowed by ext4.

In DIB, we achieve this by setting the FS_TYPE environment variable to xfs.

bifrost.yml
kolla_bifrost_dib_env_vars_extra:
  FS_TYPE: "xfs"

Example: Configuring a development user account

Warning

A development user account should not be used in production.

When debugging a failed deployment, it can sometimes be necessary to allow access to the image via a preconfigured user account with a known password. This can be achieved via the devuser element.

This example shows how to add the devuser element, and configure a username and password for an account that has passwordless sudo:

bifrost.yml
kolla_bifrost_dib_elements_extra:
  - "devuser"

kolla_bifrost_dib_env_vars_extra:
  DIB_DEV_USER_USERNAME: "devuser"
  DIB_DEV_USER_PASSWORD: "correct horse battery staple"
  DIB_DEV_USER_PWDLESS_SUDO: "yes"

Alternatively, the dynamic-login element can be used to authorize SSH keys by appending them to the kernel arguments.

Example: Installing a package

It can be necessary to install additional packages in the root disk image. Rather than needing to write a custom DIB element, we can use the kolla_bifrost_dib_packages variable. For example, to install the biosdevname package:

bifrost.yml
kolla_bifrost_dib_packages:
  - "biosdevname"

Disk image deployment configuration

The name of the root disk image to deploy can be configured via the kolla_bifrost_deploy_image_filename option, which defaults to deployment_image.qcow2. It can be defined globally in ${KAYOBE_CONFIG_PATH}/bifrost.yml, or defined per-group or per-host in the Kayobe inventory. This can be used to provision different images across the overcloud.

It can be necessary to deploy overcloud hosts with custom settings which can be configured during provision by the cloud-init user-data configured via the kolla_bifrost_deploy_image_user_data_content option. The defaults is an empty string.

bifrost.yml
kolla_bifrost_deploy_image_user_data_content: |
  users:
    name: myuser
    sudo: ALL=(ALL) NOPASSWD:ALL
    shell: /bin/bash
    passwd: <HASH_OF_MY_PASSWORD>
    lock_passwd: false

  timezone: "Europe/Paris"

While only a single disk image can be built with Bifrost, starting from the Yoga 12.0.0 release, Kayobe supports building multiple disk images directly through Diskimage builder. Consult the overcloud host disk image build documentation for more details.

Ironic configuration

The following options configure the Ironic service in the bifrost-deploy container.

kolla_bifrost_enabled_hardware_types

List of hardware types to enable for Bifrost’s Ironic. Default is ["ipmi"].

kolla_bifrost_extra_kernel_options

List of extra kernel parameters for Bifrost’s Ironic PXE configuration. Default is none.

Ironic Inspector configuration

The following options configure the Ironic Inspector service in the bifrost-deploy container.

kolla_bifrost_inspector_processing_hooks

List of of inspector processing plugins. Default is {{ inspector_processing_hooks }}, defined in ${KAYOBE_CONFIG_PATH}/inspector.yml.

kolla_bifrost_inspector_port_addition

Which MAC addresses to add as ports during introspection. One of all, active or pxe. Default is {{ inspector_add_ports }}, defined in ${KAYOBE_CONFIG_PATH}/inspector.yml.

kolla_bifrost_inspector_extra_kernel_options

List of extra kernel parameters for the inspector default PXE configuration. Default is {{ inspector_extra_kernel_options }}, defined in ${KAYOBE_CONFIG_PATH}/inspector.yml. When customising this variable, the default extra kernel parameters should be kept to retain full node inspection capabilities.

kolla_bifrost_inspector_rules

List of introspection rules for Bifrost’s Ironic Inspector service. Default is {{ inspector_rules }}, defined in ${KAYOBE_CONFIG_PATH}/inspector.yml.

kolla_bifrost_inspector_ipmi_username

Ironic inspector IPMI username to set via an introspection rule. Default is {{ ipmi_username }}, defined in ${KAYOBE_CONFIG_PATH}/bmc.yml.

kolla_bifrost_inspector_ipmi_password

Ironic inspector IPMI password to set via an introspection rule. Default is {{ ipmi_password }}, defined in ${KAYOBE_CONFIG_PATH}/bmc.yml.

kolla_bifrost_inspector_lldp_switch_port_interface

Ironic inspector network interface name on which to check for an LLDP switch port description to use as the node’s name. Default is {{ inspector_lldp_switch_port_interface_default }}, defined in ${KAYOBE_CONFIG_PATH}/inspector.yml.

kolla_bifrost_inspector_deploy_kernel

Ironic inspector deployment kernel location. Default is http://{{ provision_oc_net_name | net_ip }}:8080/ipa.kernel.

kolla_bifrost_inspector_deploy_ramdisk

Ironic inspector deployment ramdisk location. Default is http://{{ provision_oc_net_name | net_ip }}:8080/ipa.initramfs.

kolla_bifrost_inspection_timeout

Timeout of hardware inspection on overcloud nodes, in seconds. Default is {{ inspector_inspection_timeout }}, defined in ${KAYOBE_CONFIG_PATH}/inspector.yml.

Ironic Python Agent (IPA) configuration

Note

If building IPA images locally (ipa_build_images is true) this section can be skipped.

The following options configure the source of Ironic Python Agent images used by Bifrost for inspection and deployment. Consult the Ironic Python Agent documentation for full details.

kolla_bifrost_ipa_kernel_upstream_url

URL of Ironic Python Agent (IPA) kernel image. Default is {{ inspector_ipa_kernel_upstream_url }}, defined in ${KAYOBE_CONFIG_PATH}/inspector.yml.

kolla_bifrost_ipa_kernel_checksum_url

URL of checksum of Ironic Python Agent (IPA) kernel image. Default is {{ inspector_ipa_kernel_checksum_url }}, defined in ${KAYOBE_CONFIG_PATH}/inspector.yml.

kolla_bifrost_ipa_kernel_checksum_algorithm

Algorithm of checksum of Ironic Python Agent (IPA) kernel image. Default is {{ inspector_ipa_kernel_checksum_algorithm }}, defined in ${KAYOBE_CONFIG_PATH}/inspector.yml.

kolla_bifrost_ipa_ramdisk_upstream_url

URL of Ironic Python Agent (IPA) ramdisk image. Default is {{ inspector_ipa_ramdisk_upstream_url }}, defined in ${KAYOBE_CONFIG_PATH}/inspector.yml.

kolla_bifrost_ipa_ramdisk_checksum_url

URL of checksum of Ironic Python Agent (IPA) ramdisk image. Default is {{ inspector_ipa_ramdisk_checksum_url }}, defined in ${KAYOBE_CONFIG_PATH}/inspector.yml.

kolla_bifrost_ipa_ramdisk_checksum_algorithm

Algorithm of checksum of Ironic Python Agent (IPA) ramdisk image. Default is {{ inspector_ipa_ramdisk_checksum_algorithm }}, defined in ${KAYOBE_CONFIG_PATH}/inspector.yml.

Inventory configuration

Note

This feature is currently not well tested. It is advisable to use autodiscovery of overcloud servers instead.

The following option is used to configure a static inventory of servers for Bifrost.

kolla_bifrost_servers

Server inventory for Bifrost in the JSON file format.

Custom Configuration

Further configuration of arbitrary Ansible variables for Bifrost can be provided via the following files:

  • ${KAYOBE_CONFIG_PATH}/kolla/config/bifrost/bifrost.yml

  • ${KAYOBE_CONFIG_PATH}/kolla/config/bifrost/dib.yml

These are both passed as extra variables files to ansible-playbook, but the naming scheme provides a separation of DIB image related variables from other variables. It may be necessary to inspect the Bifrost source code for the full set of variables that may be configured.

For example, to configure debug logging for Ironic Inspector:

kolla/config/bifrost/bifrost.yml
inspector_debug: true