Controller Worker (deploy-worker)

Controller Worker (deploy-worker)

Launchpad blueprint:

https://blueprints.launchpad.net/octavia/+spec/controller-worker

Octavia is an operator-grade reference implementation for Load Balancing as a Service (LBaaS) for OpenStack. The component of Octavia that does the load balancing is known as Amphora.

The component of Octavia that provides command and control of the Amphora is the Octavia controller.

Problem description

Components of the Octavia controller require a shared library that provides the orchestration of create/update/delete actions for Octavia objects such as load balancers and listeners.

It is expected that this library will be used by the Queue Consumer to service API requests, by the Housekeeping Manager to manage the spare Amphora pool, and by the Health Manager to fail over failed objects.

Proposed change

The Controller Worker will be implemented as a class that provides methods to facilitate the create/update/delete actions. This class will be responsible for managing the number of simultaneous operations being executed by coordinating through the Octavia database.

The Controller Worker will provide a base class that sets up and initializes the TaskFlow engines required to complete the action. Users of the library will then call the appropriate method for the action. These methods setup and launch the appropriate flow. Each flow will be contained in a separate class for code reuse and supportability.

The Controller Worker library will provide the following methods:

def create_amphora(self):
    """Creates an Amphora.

    :returns: amphora_id
    """
    raise NotImplementedError

def delete_amphora(self, amphora_id):
    """Deletes an existing Amphora.

    :param amphora_id: ID of the amphora to delete
    :returns: None
    :raises AmphoraNotFound: The referenced Amphora was not found
    """
    raise NotImplementedError

def create_load_balancer(self, load_balancer_id):
    """Creates a load balancer by allocating Amphorae.

    :param load_balancer_id: ID of the load balancer to create
    :returns: None
    :raises NoSuitableAmphora: Unable to allocate an Amphora.
    """
    raise NotImplementedError

def update_load_balancer(self, load_balancer_id, load_balancer_updates):
    """Updates a load balancer.

    :param load_balancer_id: ID of the load balancer to update
    :param load_balancer_updates: Dict containing updated load balancer
    attributes
    :returns: None
    :raises LBNotFound: The referenced load balancer was not found
    """
    raise NotImplementedError

def delete_load_balancer(self, load_balancer_id):
    """Deletes a load balancer by de-allocating Amphorae.

    :param load_balancer_id: ID of the load balancer to delete
    :returns: None
    :raises LBNotFound: The referenced load balancer was not found
    """
    raise NotImplementedError

def create_listener(self, listener_id):
    """Creates a listener.

    :param listener_id: ID of the listener to create
    :returns: None
    :raises NoSuitableLB: Unable to find the load balancer
    """
    raise NotImplementedError

def update_listener(self, listener_id, listener_updates):
    """Updates a listener.

    :param listener_id: ID of the listener to update
    :param listener_updates: Dict containing updated listener attributes
    :returns: None
    :raises ListenerNotFound: The referenced listener was not found
    """
    raise NotImplementedError

def delete_listener(self, listener_id):
    """Deletes a listener.

    :param listener_id: ID of the listener to delete
    :returns: None
    :raises ListenerNotFound: The referenced listener was not found
    """
    raise NotImplementedError

def create_pool(self, pool_id):
    """Creates a node pool.

    :param pool_id: ID of the pool to create
    :returns: None
    :raises NoSuitableLB: Unable to find the load balancer
    """
    raise NotImplementedError

def update_pool(self, pool_id, pool_updates):
    """Updates a node pool.

    :param pool_id: ID of the pool to update
    :param pool_updates: Dict containing updated pool attributes
    :returns: None
    :raises PoolNotFound: The referenced pool was not found
    """
    raise NotImplementedError

def delete_pool(self, pool_id):
    """Deletes a node pool.

    :param pool_id: ID of the pool to delete
    :returns: None
    :raises PoolNotFound: The referenced pool was not found
    """
    raise NotImplementedError

def create_health_monitor(self, health_monitor_id):
    """Creates a health monitor.

    :param health_monitor_id: ID of the health monitor to create
    :returns: None
    :raises NoSuitablePool: Unable to find the node pool
    """
    raise NotImplementedError

def update_health_monitor(self, health_monitor_id, health_monitor_updates):
    """Updates a health monitor.

    :param health_monitor_id: ID of the health monitor to update
    :param health_monitor_updates: Dict containing updated health monitor
    attributes
    :returns: None
    :raises HMNotFound: The referenced health monitor was not found
    """
    raise NotImplementedError

def delete_health_monitor(self, health_monitor_id):
    """Deletes a health monitor.

    :param health_monitor_id: ID of the health monitor to delete
    :returns: None
    :raises HMNotFound: The referenced health monitor was not found
    """
    raise NotImplementedError

def create_member(self, member_id):
    """Creates a pool member.

    :param member_id: ID of the member to create
    :returns: None
    :raises NoSuitablePool: Unable to find the node pool
    """
    raise NotImplementedError

def update_member(self, member_id, member_updates):
    """Updates a pool member.

    :param member_id: ID of the member to update
    :param member_updates: Dict containing updated member attributes
    :returns: None
    :raises MemberNotFound: The referenced member was not found
    """
    raise NotImplementedError

def delete_member(self, member_id):
    """Deletes a pool member.

    :param member_id: ID of the member to delete
    :returns: None
    :raises MemberNotFound: The referenced member was not found
    """
    raise NotImplementedError

def failover_amphora(self, amphora_id):
    """Failover an amphora

    :param amp_id: ID of the amphora to fail over
    :returns: None
    :raises AmphoraNotFound: The referenced Amphora was not found
    """
    raise NotImplementedError

Alternatives

This code could be included in the Queue Consumer component of the controller. However this would not allow the library to be shared with other components of the controller, such as the Health Manager

Data model impact

REST API impact

None

Security impact

Notifications impact

Other end user impact

Performance Impact

Other deployer impact

Developer impact

Implementation

Assignee(s)

Michael Johnson <johnsom>

Work Items

Testing

Unit tests

Documentation Impact

None

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