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.

Local Environment

Environment variables are used to configure the environment in which kolla-ansible is installed and executed.

Kolla-ansible environment variables
Variable Purpose Default
$KOLLA_CONFIG_PATH Path on the ansible control host in which the kolla-ansible configuration will be generated. These files should not be manually edited. /etc/kolla
$KOLLA_SOURCE_PATH Path on the ansible control host in which the kolla-ansible source code will be cloned. $PWD/src/kolla-ansible
$KOLLA_VENV_PATH Path on the ansible control host in which the kolla-ansible virtualenv will be created. $PWD/venvs/kolla-ansible

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 without 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.

If the variable kolla_ansible_target_venv is set, kolla-ansible will be configured to create and use a virtual environment on the remote hosts. This variable is by default set to {{ virtualenv_path }}/kolla-ansible. The previous behaviour of installing python dependencies directly to the host can be used by setting kolla_ansible_target_venv to None.

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.

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.

Configuring Custom Global Variables

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.

$KAYOBE_CONFIG_PATH/kolla/globals.yml
---
# Use a custom tag for the nova-api container image.
nova_api_tag: v1.2.3

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.

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.

$KAYOBE_CONFIG_PATH/kolla.yml
---
# Dictionary containing custom passwords to add or override in the Kolla
# passwords file.
kolla_ansible_custom_passwords: >
  {{ kolla_ansible_default_custom_passwords |
     combine({'my_custom_password': 'correcthorsebatterystaple'}) }}

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.

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:

$KAYOBE_CONFIG_PATH/kolla/config/glance.conf
[DEFAULT]
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:

$KAYOBE_CONFIG_PATH/kolla/config/glance/glance-api.conf
[DEFAULT]
api_limit_max = 500