kolla-ansible.rst

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:

kolla_ansible_ctl_install_type

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

kolla_ansible_source_url

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

kolla_ansible_source_version

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

kolla_ansible_venv_extra_requirements

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

kolla_upper_constraints_file

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:

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:

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.

kolla_ansible_source_path

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

kolla_ansible_venv

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

kolla_config_path

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 :ref:`Kolla image build configuration <configuration-kolla-global>`.

Kolla Images

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

kolla_base_distro

Kolla base container image distribution. Default is centos.

kolla_install_type

Kolla container image type: binary or source. Default is binary.

kolla_docker_registry

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

kolla_docker_namespace

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

kolla_docker_registry_username

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

kolla_docker_registry_password

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

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 centos binary images with a namespace of example, and a private Docker registry at registry.example.com:4000, tagged with 7.0.0.1:

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

registry.example.com:4000/example/centos-binary-ironic-api:7.0.0.1

Ansible

The following variables affect how Ansible accesses the remote hosts.

kolla_ansible_user

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

kolla_ansible_group

Primary group of Kolla SSH user. Default is kolla.

kolla_ansible_become

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

kolla_ansible_target_venv

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.

kolla_ansible_create_user

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.

kolla_openstack_logging_debug

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.

TLS Encryption of APIs

The following variables affect TLS encryption of the public API.

kolla_enable_tls_external

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

kolla_external_tls_cert

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.

kolla_external_fqdn_cacert

Path to a CA certificate file to use for the OS_CACERT environment variable in openrc files when TLS is enabled, instead of Kolla Ansible's default.

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.

kolla_enable_tls_internal

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

kolla_internal_tls_cert

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.

kolla_internal_fqdn_cacert

Path to a CA certificate file to use for the OS_CACERT environment variable in openrc 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:

Example: enabling TLS for the internal API

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

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-doc:`Kolla Ansible documentation <admin/advanced-configuration.html#tls-configuration>` 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:

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:

Custom Group Variables

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, :kolla-ansible-doc:`Nova cells are configured <reference/compute/nova-cells-guide>` via group variables. For example, to configure cell0001 the following file could be created:

Passwords

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.

kolla_ansible_custom_passwords

Dictionary containing custom passwords to add or override in the Kolla passwords file. Default is {{ kolla_ansible_default_custom_passwords }}, which contains SSH keys for use by Kolla Ansible and Bifrost.

Configuring Custom Passwords

In order to write additional passwords to passwords.yml, set the kayobe variable kolla_ansible_custom_passwords in $KAYOBE_CONFIG_PATH/kolla.yml.

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-doc:`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:

Note that in some cases additional configuration may be required to successfully deploy a service - check the :kolla-ansible-doc:`Kolla Ansible configuration reference <reference>`.

Service Configuration

Kolla-ansible's flexible configuration is described in the :kolla-ansible-doc:`Kolla Ansible service configuration documentation <admin/advanced-configuration.html#openstack-service-configuration-in-kolla>`. 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

File	Purpose
aodh.conf	Aodh configuration.
aodh/*	Extended Aodh configuration.
backup.my.cnf	Mariabackup configuration.
barbican/*	Extended Barbican configuration.
blazar.conf	Blazar configuration.
blazar/*	Extended Blazar configuration.
ceilometer.conf	Ceilometer configuration.
ceilometer/*	Extended Ceilometer configuration.
cinder.conf	Cinder configuration.
cinder/*	Extended Cinder configuration.
cloudkitty.conf	CloudKitty configuration.
cloudkitty/*	Extended CloudKitty configuration.
designate.conf	Designate configuration.
designate/*	Extended Designate configuration.
fluentd/filter	Fluentd filter configuration.
fluentd/input	Fluentd input configuration.
fluentd/output	Fluentd output configuration.
galera.cnf	MariaDB configuration.
glance.conf	Glance configuration.
glance/*	Extended Glance configuration.
global.conf	Global configuration for all OpenStack services.
gnocchi.conf	Gnocchi configuration.
gnocchi/*	Extended Gnocchi configuration.
grafana.ini	Grafana configuration.
grafana/*	Extended Grafana configuration.
haproxy/*	Main HAProxy configuration.
haproxy-config/*	Modular HAProxy configuration.
heat.conf	Heat configuration.
heat/*	Extended heat configuration.
horizon/*	Extended horizon configuration.
influx*	InfluxDB configuration.
ironic-inspector.conf	Ironic inspector configuration.
ironic.conf	Ironic configuration.
ironic/*	Extended ironic configuration.
kafka.server.properties	Kafka configuration.
kafka/*	Extended Kafka configuration.
keepalived/*	Extended keepalived configuration.
keystone.conf	Keystone configuration.
keystone/*	Extended keystone configuration.
magnum.conf	Magnum configuration.
magnum/*	Extended magnum configuration.
manila.conf	Manila configuration.
manila/*	Extended manila configuration.
mariadb/*	Extended MariaDB configuration.
masakari.conf	Masakari configuration.
masakari/*	Extended masakari configuration.
monasca/*	Extended Monasca configuration.
murano.conf	Murano configuration.
murano/*	Extended murano configuration.
neutron.conf	Neutron configuration.
neutron/ml2_conf.ini	Neutron ML2 configuration.
neutron/*	Extended neutron configuration.
nova.conf	Nova configuration.
nova/*	Extended nova configuration.
octavia.conf	Octavia configuration.
octavia/*	Extended Octavia configuration.
sahara.conf	Sahara configuration.
sahara/*	Extended sahara configuration.
storm/*	Extended Storm configuration.
swift/*	Extended swift configuration.
zookeeper.cfg	Zookeeper configuration.
zookeeper/*	Extended Zookeeper 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:

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: