Hardware introspection daemon for OpenStack Ironic
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ironic-inspector/CONTRIBUTING.rst

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How To Contribute

Basics

  • Our source code is hosted on OpenStack GitHub, but please do not send pull requests there.
  • Please follow usual OpenStack Gerrit Workflow to submit a patch.
  • Update change log in README.rst on any significant change.
  • It goes without saying that any code change should by accompanied by unit tests.
  • Note the branch you're proposing changes to. master is the current focus of development, use stable/VERSION for proposing an urgent fix, where VERSION is the current stable series. E.g. at the moment of writing the stable branch is stable/1.0.
  • Please file a launchpad blueprint for any significant code change and a bug for any significant bug fix.

Development Environment

First of all, install tox utility. It's likely to be in your distribution repositories under name of python-tox. Alternatively, you can install it from PyPI.

Next checkout and create environments:

git clone https://github.com/openstack/ironic-inspector.git
cd ironic-inspector
tox

Repeat tox command each time you need to run tests. If you don't have Python interpreter of one of supported versions (currently 2.7 and 3.4), use -e flag to select only some environments, e.g.

tox -e py27

Note

Support for Python 3 is highly experimental, stay with Python 2 for the production environment for now.

Note

This command also runs tests for database migrations. By default the sqlite backend is used. For testing with mysql or postgresql, you need to set up a db named 'openstack_citest' with user 'openstack_citest' and password 'openstack_citest' on localhost.

Note

Users of Fedora <= 23 will need to run "sudo dnf --releasever=24 update python-virtualenv" to run unit tests

To run the functional tests, use:

tox -e func

Run the service with:

.tox/py27/bin/ironic-inspector --config-file example.conf

Of course you may have to modify example.conf to match your OpenStack environment.

You can develop and test ironic-inspector using DevStack - see DevStack Support for the current status.

DevStack Support

DevStack provides a way to quickly build full OpenStack development environment with requested components. There is a plugin for installing ironic-inspector on DevStack.

Example local.conf

[[local|localrc]]
enable_service ironic ir-api ir-cond
disable_service n-net n-novnc
enable_service neutron q-svc q-agt q-dhcp q-l3 q-meta
enable_service s-proxy s-object s-container s-account
disable_service heat h-api h-api-cfn h-api-cw h-eng
disable_service cinder c-sch c-api c-vol

enable_plugin ironic https://github.com/openstack/ironic
enable_plugin ironic-inspector https://github.com/openstack/ironic-inspector

IRONIC_BAREMETAL_BASIC_OPS=True
IRONIC_VM_COUNT=2
IRONIC_VM_SPECS_RAM=1024

IRONIC_DEPLOY_DRIVER_ISCSI_WITH_IPA=True
IRONIC_BUILD_DEPLOY_RAMDISK=False
IRONIC_INSPECTOR_BUILD_RAMDISK=False

VIRT_DRIVER=ironic

LOGDAYS=1
LOGFILE=~/logs/stack.sh.log
SCREEN_LOGDIR=~/logs/screen

DEFAULT_INSTANCE_TYPE=baremetal
TEMPEST_ALLOW_TENANT_ISOLATION=False

Notes

  • Set IRONIC_INSPECTOR_BUILD_RAMDISK to True if you want to build ramdisk. Default value is False and ramdisk will be downloaded instead of building.
  • 1024 MiB of RAM is a minimum required for the default build of IPA based on CoreOS. If you plan to use another operating system and build IPA with diskimage-builder 2048 MiB is recommended.
  • Network configuration is pretty sensitive, better not to touch it without deep understanding.
  • This configuration disables Heat and Cinder, adjust it if you need these services.

Test

There is a test script included:

source devstack/openrc admin admin
/opt/stack/ironic-inspector/devstack/exercise.sh

Usage

Start introspection for a node manually:

source devstack/openrc admin admin
openstack baremetal introspection start <UUID>

Then check status via API:

openstack baremetal introspection status <UUID>

Writing a Plugin

  • ironic-inspector allows you to hook code into the data processing chain after introspection. Inherit ProcessingHook class defined in ironic_inspector.plugins.base module and overwrite any or both of the following methods:

    before_processing(introspection_data,**)

    called before any data processing, providing the raw data. Each plugin in the chain can modify the data, so order in which plugins are loaded matters here. Returns nothing.

    before_update(introspection_data,node_info,**)

    called after node is found and ports are created, but before data is updated on a node. Please refer to the docstring for details and examples.

    Make your plugin a setuptools entry point under ironic_inspector.hooks.processing namespace and enable it in the configuration file (processing.processing_hooks option).

  • ironic-inspector allows plugins to override the action when node is not found in node cache. Write a callable with the following signature:

    (introspection_data,**)

    called when node is not found in cache, providing the processed data. Should return a NodeInfo class instance.

    Make your plugin a setuptools entry point under ironic_inspector.hooks.node_not_found namespace and enable it in the configuration file (processing.node_not_found_hook option).

  • ironic-inspector allows more condition types to be added for Introspection Rules. Inherit RuleConditionPlugin class defined in ironic_inspector.plugins.base module and overwrite at least the following method:

    check(node_info,field,params,**)

    called to check that condition holds for a given field. Field value is provided as field argument, params is a dictionary defined at the time of condition creation. Returns boolean value.

    The following methods and attributes may also be overridden:

    validate(params,**)

    called to validate parameters provided during condition creating. Default implementation requires keys listed in REQUIRED_PARAMS (and only them).

    REQUIRED_PARAMS

    contains set of required parameters used in the default implementation of validate method, defaults to value parameter.

    ALLOW_NONE

    if it's set to True, missing fields will be passed as None values instead of failing the condition. Defaults to False.

    Make your plugin a setuptools entry point under ironic_inspector.rules.conditions namespace.

  • ironic-inspector allows more action types to be added for Introspection Rules. Inherit RuleActionPlugin class defined in ironic_inspector.plugins.base module and overwrite at least the following method:

    apply(node_info,params,**)

    called to apply the action.

    The following methods and attributes may also be overridden:

    validate(params,**)

    called to validate parameters provided during actions creating. Default implementation requires keys listed in REQUIRED_PARAMS (and only them).

    REQUIRED_PARAMS

    contains set of required parameters used in the default implementation of validate method, defaults to no parameters.

    Make your plugin a setuptools entry point under ironic_inspector.rules.conditions namespace.

Note

** argument is needed so that we can add optional arguments without breaking out-of-tree plugins. Please make sure to include and ignore it.

Making changes to the database

In order to make a change to the ironic-inspector database you must update the database models found in ironic_inspector.db and then create a migration to reflect that change.

There are two ways to create a migration which are described below, both of these generate a new migration file. In this file there are two functions:

  • upgrade - The upgrade function is run when

    ironic-inspector-dbsync upgrade is run, and should be populated with code to bring the database up to its new state from the state it was in after the last migration.

  • downgrade - The downgrade function should have code to undo the actions which

    upgrade performs, returning the database to the state it would have been in before the migration ran.

For further information on creating a migration, refer to Create a Migration Script from the alembic documentation.

Autogenerate

This is the simplest way to create a migration. Alembic will compare the models to an up to date database, and then attempt to write a migration based on the differences. This should generate correct migrations in most cases however there are some cases when it can not detect some changes and may require manual modification, see What does Autogenerate Detect (and what does it not detect?) from the alembic documentation.

ironic-inspector-dbsync upgrade
ironic-inspector-dbsync revision -m "A short description" --autogenerate

Manual

This will generate an empty migration file, with the correct revision information already included. However upgrade and downgrade are left empty and must be manually populated in order to perform the correct actions on the database:

ironic-inspector-dbsync revision -m "A short description"