tacker-specs/specs/yoga/vim-monitor-feature.rst

Add VIM monitoring feature

https://blueprints.launchpad.net/tacker/+spec/vim-monitor-feature

This spec shows the feature of monitoring VIM inside Tacker itself.

Problem description

In the current Tacker implementation, Mistral workflow service is used as the VIM monitoring function. It indicates Tacker requires Mistral component for its VNFM feature. However, the VNFM feature should be achieved and also processed only inside Tacker component.

Proposed change

In this change, a VIM monitoring feature is newly added instead of calling the same feature in Mistral.

This feature contains the following two functions.

• Monitoring VIM function

Each existing VIM is got health-check with ping from a VIM monitor. As long as the VIM is alive, the monitor sets its status as "REACHABLE". A monitor is dispatched every time a new VIM is created by the VIM monitor manager and associated with the VIM one-to-one.

• Managing VIM monitor function

Monitoring VIM function is controlled by the VIM monitor manager. When a VIM is newly created, the manager generates a monitor ID and register a monitor associated with the VIM. Also, when a VIM is deleted, the manager unregisters the monitor associated with the VIM. The manager periodically checks each monitor's status. If there is a monitor which status is not processing, the manager forcibly deletes it.

The code corresponding to this feature is placed in a new directory named "vim_monitor", which is under tacker/nfvo directory.

Alternatives

None

Data model impact

None

REST API impact

None

Security impact

None

Notifications impact

None

Other end user impact

None

Performance Impact

None

Other deployer impact

The VNFM feature can be processed without Mistral workflow service.

Developer impact

None

Upgrade impact

None

Implementation

Assignee(s)

Primary assignee:

Koichi Edagawa <edagawa.kc@nec.com>

Work Items

• Add monitoring VIM function
• Add managing VIM monitor function
• Change to use the above two functions instead of using Mistral

Dependencies

None

Testing

Unit test cases will be added.

Documentation Impact

Contributor guide will be modified to explain that monitoring VIM feature is contained in Tacker instead of using Mistral.

References

None

History

None