Kolla Ansible Configuration

Kayobe relies heavily on Kolla Ansible for deployment of the OpenStack control plane. Kolla Ansible is installed locally on the Ansible control host (the host from which Kayobe commands are executed), and Kolla Ansible commands are executed from there.

Kolla Ansible configuration is stored in ${KAYOBE_CONFIG_PATH}/kolla.yml.

Configuration of Ansible

Ansible configuration is described in detail in the Ansible documentation. In addition to the standard locations, Kayobe supports using an Ansible configuration file located in the Kayobe configuration at ${KAYOBE_CONFIG_PATH}/kolla/ansible.cfg or ${KAYOBE_CONFIG_PATH}/ansible.cfg. Note that if the ANSIBLE_CONFIG environment variable is specified it takes precedence over this file.

Kolla Ansible Installation

Prior to deploying containers, Kolla Ansible and its dependencies will be installed on the Ansible control host. The following variables affect the installation of Kolla Ansible:


Type of Kolla Ansible control installation. One of binary (PyPI) or source (git). Default is source.


URL of Kolla Ansible source code repository if type is source. Default is https://opendev.org/openstack/kolla-ansible.


Version (branch, tag, etc.) of Kolla Ansible source code repository if type is source. Default is the same as the Kayobe upstream branch.


Extra requirements to install inside the Kolla Ansible virtualenv. Default is an empty list.


Upper constraints file for installation of Kolla. Default is {{ pip_upper_constraints_file }}, which has a default of https://releases.openstack.org/constraints/upper/{{ openstack_branch }}.

Example: custom git repository

To install Kolla Ansible from a custom git repository:

kolla_ansible_source_url: https://git.example.com/kolla-ansible
kolla_ansible_source_version: downstream

Virtual Environment Extra Requirements

Extra Python packages can be installed inside the Kolla Ansible virtualenv, such as when required by Ansible plugins.

For example, to use the hashi_vault Ansible lookup plugin, its hvac dependency can be installed using:

# Extra requirements to install inside the Kolla Ansible virtualenv.
  - "hvac"

Local environment

The following variables affect the local environment on the Ansible control host. They reference environment variables, and should be configured using those rather than modifying the Ansible variable directly. The file kayobe-env in the kayobe-config git repository sets some sensible defaults for these variables, based on the recommended environment directory structure.


Path to directory for Kolla Ansible source code checkout. Default is $KOLLA_SOURCE_PATH, or $PWD/src/kolla-ansible.


Path to virtualenv in which to install Kolla Ansible on the Ansible control host. Default is $KOLLA_VENV_PATH or $PWD/venvs/kolla-ansible.


Path to Kolla Ansible configuration directory. Default is $KOLLA_CONFIG_PATH or /etc/kolla.

Global Configuration

The following variables are global, affecting all containers. They are used to generate the Kolla Ansible configuration file, globals.yml, and also affect Kolla image build configuration.

Kolla Images

The following variables affect which Kolla images are used, and how they are accessed.


Kolla base container image distribution. Default is {{ os_distribution }}.


Kolla base container image distribution version. Default is dependent on kolla_base_distro.


URL of docker registry to use for Kolla images. Default is not set, in which case Quay.io will be used.


Docker namespace to use for Kolla images. Default is kolla.


Username to use to access a docker registry. Default is not set, in which case the registry will be used without authentication.


Password to use to access a docker registry. Default is not set, in which case the registry will be used without authentication.


Kolla OpenStack release version. This should be a Docker image tag. Default is {{ openstack_release }}, which takes the OpenStack release name (e.g. rocky) on stable branches and tagged releases, or master on the Kayobe master branch.

For example, to deploy Kolla rocky images with a namespace of example, and a private Docker registry at registry.example.com:4000, and the zed release.

kolla_base_distro: rocky
kolla_docker_namespace: example
kolla_docker_registry: registry.example.com:4000
kolla_openstack_release: zed

The deployed ironic-api image would be referenced as follows:



The following variables affect how Ansible accesses the remote hosts.


User account to use for Kolla SSH access. Default is kolla.


Primary group of Kolla SSH user. Default is kolla.


Whether to use privilege escalation for all operations performed via Kolla Ansible. Default is false since the 8.0.0 Ussuri release.


Path to a virtual environment on remote hosts to use for Ansible module execution. Default is {{ virtualenv_path }}/kolla-ansible. May be set to None to use the system Python interpreter.

Context: Remote Execution Environment

By default, Ansible executes modules remotely using the system python interpreter, even if the Ansible control process is executed from within a virtual environment (unless the local connection plugin is used). This is not ideal if there are python dependencies that must be installed with isolation from the system python packages. Ansible can be configured to use a virtualenv by setting the host variable ansible_python_interpreter to a path to a python interpreter in an existing virtual environment.

The variable kolla_ansible_target_venv configures the use of a virtual environment on the remote hosts. The default configuration should work in most cases.

User account creation

Since the Ussuri release, Kayobe creates a user account for Kolla Ansible rather than this being done during Kolla Ansible’s bootstrap-servers command. This workflow is more compatible with Ansible fact caching, but does mean that Kolla Ansible’s create_kolla_user variable cannot be used to disable creation of the user account. Instead, set kolla_ansible_create_user to false.


Whether to create a user account, configure passwordless sudo and authorise an SSH key for Kolla Ansible. Default is true.

OpenStack Logging

The following variable affects OpenStack debug logging.


Whether debug logging is enabled for OpenStack services. Default is false.

Example: enabling debug logging

In certain situations it may be necessary to enable debug logging for all OpenStack services. This is not usually advisable in production.

kolla_openstack_logging_debug: true

API Addresses


These variables should be used over the deprecated vip_address and fqdn network attributes.

The following variables affect the addresses used for the external and internal API.


Virtual IP address of OpenStack internal API. Default is the vip_address attribute of the internal network.


Fully Qualified Domain Name (FQDN) of OpenStack internal API. Default is the fqdn attribute of the internal network if set, otherwise kolla_internal_vip_address.


Virtual IP address of OpenStack external API. Default is the vip_address attribute of the external network.


Fully Qualified Domain Name (FQDN) of OpenStack external API. Default is the fqdn attribute of the external network if set, otherwise kolla_external_vip_address.

TLS Encryption of APIs

The following variables affect TLS encryption of the public API.


Whether TLS is enabled for the public API endpoints. Default is no.


A TLS certificate bundle to use for the public API endpoints, if kolla_enable_tls_external is true. Note that this should be formatted as a literal style block scalar.

The following variables affect TLS encryption of the internal API. Currently this requires all Kolla images to be built with the API’s root CA trusted.


Whether TLS is enabled for the internal API endpoints. Default is no.


A TLS certificate bundle to use for the internal API endpoints, if kolla_enable_tls_internal is true. Note that this should be formatted as a literal style block scalar.

The following variables affect the generated admin-openrc.sh and public-openrc.sh environment files.


Path to a CA certificate file to use for the OS_CACERT environment variable in the public-openrc.sh file when TLS is enabled, instead of kolla_admin_openrc_cacert.


Path to a CA certificate file to use for the OS_CACERT environment variable in the admin-openrc.sh and public-openrc.sh files when TLS is enabled, instead of Kolla Ansible’s default.

Example: enabling TLS for the public API

It is highly recommended to use TLS encryption to secure the public API. Here is an example:

kolla_enable_tls_external: yes
kolla_external_tls_cert: |
kolla_admin_openrc_cacert: /path/to/ca/certificate/bundle

Example: enabling TLS for the internal API

It is highly recommended to use TLS encryption to secure the internal API. Here is an example:

kolla_enable_tls_internal: yes
kolla_internal_tls_cert: |
kolla_admin_openrc_cacert: /path/to/ca/certificate/bundle

Other certificates

In general, Kolla Ansible expects certificates to be in a directory configured via kolla_certificates_dir, which defaults to a directory named certificates in the same directory as globals.yml. Kayobe follows this pattern, and will pass files and directories added to ${KAYOBE_CONFIG_PATH}/kolla/certificates/ through to Kolla Ansible. This can be useful when enabling backend API TLS encryption, or providing custom CA certificates to be added to the trust store in containers. It is also possible to use this path to provide certificate bundles for the external or internal APIs, as an alternative to kolla_external_tls_cert and kolla_internal_tls_cert.

Note that Ansible will automatically decrypt these files if they are encrypted via Ansible Vault and it has access to a Vault password.

Example: adding a trusted custom CA certificate to containers

In an environment with a private CA, it may be necessary to add the root CA certificate to the trust store of containers.


These files should be PEM-formatted, and have a .crt extension.

Example: adding certificates for backend TLS

Kolla Ansible backend TLS can be used to provide end-to-end encryption of API traffic.


See the Kolla Ansible documentation for how to provide service and/or host-specific certificates and keys.

Custom Global Variables

Kolla Ansible uses a single file for global variables, globals.yml. Kayobe provides configuration variables for all required variables and many of the most commonly used the variables in this file. Some of these are in $KAYOBE_CONFIG_PATH/kolla.yml, and others are determined from other sources such as the networking configuration in $KAYOBE_CONFIG_PATH/networks.yml.

Additional global configuration may be provided by creating $KAYOBE_CONFIG_PATH/kolla/globals.yml. Variables in this file will be templated using Jinja2, and merged with the Kayobe globals.yml configuration.

Example: use a specific tag for each image

For more fine-grained control over images, Kolla Ansible allows a tag to be defined for each image. For example, for nova-api:

# Use a custom tag for the nova-api container image.
nova_api_tag: v1.2.3

Example: debug logging per-service

Enabling debug logging globally can lead to a lot of additional logs being generated. Often we are only interested in a particular service. For example, to enable debug logging for Nova services:

nova_logging_debug: true

Host variables

Kayobe generates a host_vars file for each host in the Kolla Ansible inventory. These contain network interfaces and other host-specific things. Some Kayobe Ansible variables are passed through to Kolla Ansible, as defined by the following variables. The default set of variables should typically be kept. Additional variables may be passed through via the *_extra variables, as described below. If a passed through variable is not defined for a host, it is ignored.


List of names of host variables to pass through from kayobe hosts to the Kolla Ansible seed host, if set. See also kolla_seed_inventory_pass_through_host_vars_map. The default is:

  - "ansible_host"
  - "ansible_port"
  - "ansible_ssh_private_key_file"
  - "kolla_api_interface"
  - "kolla_bifrost_network_interface"

It is possible to extend this list via kolla_seed_inventory_pass_through_host_vars_extra.


Dict mapping names of variables in kolla_seed_inventory_pass_through_host_vars to the variable to use in Kolla Ansible. If a variable name is not in this mapping the kayobe name is used. The default is:

  kolla_api_interface: "api_interface"
  kolla_bifrost_network_interface: "bifrost_network_interface"

It is possible to extend this dict via kolla_seed_inventory_pass_through_host_vars_map_extra.


List of names of host variables to pass through from Kayobe hosts to Kolla Ansible hosts, if set. See also kolla_overcloud_inventory_pass_through_host_vars_map. The default is:

  - "ansible_host"
  - "ansible_port"
  - "ansible_ssh_private_key_file"
  - "kolla_network_interface"
  - "kolla_api_interface"
  - "kolla_storage_interface"
  - "kolla_cluster_interface"
  - "kolla_swift_storage_interface"
  - "kolla_swift_replication_interface"
  - "kolla_provision_interface"
  - "kolla_inspector_dnsmasq_interface"
  - "kolla_dns_interface"
  - "kolla_tunnel_interface"
  - "kolla_external_vip_interface"
  - "kolla_neutron_external_interfaces"
  - "kolla_neutron_bridge_names"

It is possible to extend this list via kolla_overcloud_inventory_pass_through_host_vars_extra.


Dict mapping names of variables in kolla_overcloud_inventory_pass_through_host_vars to the variable to use in Kolla Ansible. If a variable name is not in this mapping the Kayobe name is used. The default is:

  kolla_network_interface: "network_interface"
  kolla_api_interface: "api_interface"
  kolla_storage_interface: "storage_interface"
  kolla_cluster_interface: "cluster_interface"
  kolla_swift_storage_interface: "swift_storage_interface"
  kolla_swift_replication_interface: "swift_replication_interface"
  kolla_provision_interface: "provision_interface"
  kolla_inspector_dnsmasq_interface: "ironic_dnsmasq_interface"
  kolla_dns_interface: "dns_interface"
  kolla_tunnel_interface: "tunnel_interface"
  kolla_neutron_external_interfaces: "neutron_external_interface"
  kolla_neutron_bridge_names: "neutron_bridge_name"

It is possible to extend this dict via kolla_overcloud_inventory_pass_through_host_vars_map_extra.

Example: pass through an additional host variable

In this example we pass through a variable named my_kayobe_var from Kayobe to Kolla Ansible.

  - my_kayobe_var

This variable might be defined in the Kayobe inventory, e.g.

my_kayobe_var: foo

The variable may then be referenced in $KAYOBE_CONFIG_PATH/kolla/globals.yml, Kolla Ansible group variables, or in Kolla Ansible custom service configuration.

In case the variable requires a different name in Kolla Ansible, use kolla_overcloud_inventory_pass_through_host_vars_map_extra:

  my_kayobe_var: my_kolla_ansible_var

Custom Kolla Inventory

When running Kolla Ansible playbooks, kayobe will check for any customised inventories in the following locations:

  • ${KAYOBE_CONFIG_PATH}/kolla/inventory/

  • ${KAYOBE_CONFIG_PATH}/environments/<environment>/kolla/inventory/

These are copied when kayobe generates the Kolla Ansible configuration. The copy is passed to Ansible as an additional inventory when running any Kolla Ansible playbooks. No templating or additional preprocessing is performed. For this reason, this directory must be a valid Ansible inventory, with the exception that *.j2 files are ignored to keep compatibility with custom Kolla Ansible inventory templates.

Group variables can be used to set configuration for all hosts in a group. They can be set in Kolla Ansible by placing files in ${KAYOBE_CONFIG_PATH}/kolla/inventory/group_vars/*. Since this directory is copied directly into the Kolla Ansible inventory, Kolla Ansible group names should be used. It should be noted that extra-vars and host_vars take precedence over group_vars. For more information on variable precedence see the Ansible documentation.

Example: configure a Nova cell

In Kolla Ansible, Nova cells are configured via group variables. For example, to configure cell0001 the following file could be created:

nova_cell_name: cell0001
nova_cell_novncproxy_group: cell0001-vnc
nova_cell_conductor_group: cell0001-control
nova_cell_compute_group: cell0001-compute


Kolla Ansible auto-generates passwords to a file, passwords.yml. Kayobe handles the orchestration of this, as well as encryption of the file using an Ansible Vault password specified in the KAYOBE_VAULT_PASSWORD environment variable, if present. The file is generated to $KAYOBE_CONFIG_PATH/kolla/passwords.yml, and should be stored along with other Kayobe configuration files. This file should not be manually modified.

Configuring Custom Passwords

The following variables are used to configure custom passwords:

  • kolla_ansible_default_custom_passwords: Dictionary containing default custom passwords, required by Kolla Ansible. Contains SSH keys authorized by kolla user on Kolla hosts, SSH keys authorized in hosts deployed by Bifrost, Docker Registry password and compute libVirt custom passwords.

  • kolla_ansible_extra_custom_passwords: Dictionary containing extra custom passwords to add or override in the Kolla passwords file. Default is an empty dictionary.

  • kolla_ansible_custom_passwords: Dictionary containing custom passwords to add or override in the Kolla passwords file. Default is the combination of the kolla_ansible_default_custom_passwords and kolla_ansible_extra_custom_passwords.

In this example we add our own my_custom_password and override keystone_admin_password:

# Dictionary containing extra custom passwords to add or override in the
# Kolla passwords file.
  my_custom_password: 'correcthorsebatterystaple'
  keystone_admin_password: 'superduperstrongpassword'

Control Plane Services

Kolla Ansible provides a flexible mechanism for configuring the services that it deploys. Kayobe adds some commonly required configuration options to the defaults provided by Kolla Ansible, but also allows for the free-form configuration supported by Kolla Ansible. The Kolla Ansible documentation should be used as a reference.

Enabling Services

Services deployed by Kolla Ansible are enabled via flags.

kolla_enable_<service or feature>

There are various flags that can be used to enable features. These map to variables named enable_<service or feature> in Kolla Ansible. The default set of enabled services and features is the same as in Kolla ansible, except that Ironic is enabled by default in Kayobe.

Example: enabling a service

A common task is enabling a new OpenStack service. This may be done via the kolla_enable_* flags, for example:

kolla_enable_swift: true

Note that in some cases additional configuration may be required to successfully deploy a service - check the Kolla Ansible configuration reference.

Service Configuration

Kolla-ansible’s flexible configuration is described in the Kolla Ansible service configuration documentation. We won’t duplicate that here, but essentially it involves creating files under a directory which for users of kayobe will be $KOLLA_CONFIG_PATH/config. In kayobe, files in this directory are auto-generated and managed by kayobe. Instead, users should create files under $KAYOBE_CONFIG_PATH/kolla/config with the same directory structure. These files will be templated using Jinja2, merged with kayobe’s own configuration, and written out to $KOLLA_CONFIG_PATH/config.

The following files, if present, will be templated and provided to Kolla Ansible. All paths are relative to $KAYOBE_CONFIG_PATH/kolla/config. Note that typically Kolla Ansible does not use the same wildcard patterns, and has a more restricted set of files that it will process. In some cases, it may be necessary to inspect the Kolla Ansible configuration tasks to determine which files are supported.

Kolla-ansible configuration files




Aodh configuration.


Extended Aodh configuration.


Mariabackup configuration.


Barbican configuration.


Extended Barbican configuration.


Blazar configuration.


Extended Blazar configuration.


Ceilometer configuration.


Extended Ceilometer configuration.


Cinder configuration.


Extended Cinder configuration.


CloudKitty configuration.


Extended CloudKitty configuration.


Designate configuration.


Extended Designate configuration.


Fluentd filter configuration.


Fluentd input configuration.


Fluentd output configuration.


MariaDB configuration.


Glance configuration.


Extended Glance configuration.


Global configuration for all OpenStack services.


Gnocchi configuration.


Extended Gnocchi configuration.


Grafana configuration.


Extended Grafana configuration.


Main HAProxy configuration.


Modular HAProxy configuration.


Heat configuration.


Extended heat configuration.


Extended horizon configuration.


InfluxDB configuration.


Ironic inspector configuration.


Ironic configuration.


Extended ironic configuration.


Extended keepalived configuration.


Keystone configuration.


Extended keystone configuration.


Magnum configuration.


Extended magnum configuration.


Manila configuration.


Extended manila configuration.


Extended MariaDB configuration.


Masakari configuration.


Extended masakari configuration.


Multipathd configuration.


Neutron configuration.


Neutron ML2 configuration.


Extended neutron configuration.


Nova configuration.


Extended nova configuration.


Octavia configuration.


Extended Octavia configuration.


OpenSearch configuration.


Placement configuration.


Extended Placement configuration.


Prometheus configuration.


Extended swift configuration.


Extended Telegraf configuration.

Configuring an OpenStack Component

To provide custom configuration to be applied to all glance services, create $KAYOBE_CONFIG_PATH/kolla/config/glance.conf. For example:

api_limit_max = 500

Configuring an OpenStack Service

To provide custom configuration for the glance API service, create $KAYOBE_CONFIG_PATH/kolla/config/glance/glance-api.conf. For example:

api_limit_max = 500