Bug Reference

The Jira issue associated with this design spec: CLOUDSTACK-4085

Branch

The proposed solution does not yet warrant a sepparate branch.

Introduction

In a software defined network environment, it might be desirable to connect multiple vpc routers to a single network

Purpose

this is functional specification of feature "create VpcGateways of different VPCs in the same (lswitch) network" which has Jira ID CLOUDSTACK-4085

References

• external hosted private gateways

Document History

Glossary

Feature Specifications

• When a vpc gateway is created a network is specified by vlan or lswitch uri (api only after external hosted private gateways has been implemented). The creation of this network is refused if it already exists and the gateway creation is aborted. The creation shouldn't be aborted as vpc gateways should be able to communicate and define routes towards one and another.
• This feature will (for now) only be implemented in the case of lswitched networks.

• quality risks (test guidelines)
  • functional
  • non functional: performance, scalability, stability, overload scenarios, etc
  • corner cases and boundary conditions
  • negative usage scenarios
• specify supportability characteristics:
  • what new logging (or at least the important one) is introduced
  • how to debug and troubleshoot
  • what are the audit events 
  • list JMX interfaces
  • graceful failure and recovery scenarios
  • possible fallback or work around route if feature does not work as expected, if those workarounds do exist ofcourse.
  • if feature depends other run-time environment related requirements, provide sanity check list for support people to run
• explain configuration characteristics:
  • configuration parameters or files introduced/changed
  • branding parameters or files introduced/changed
  • highlight parameters for performance tweaking
  • highlight how installation/upgrade scenarios change
• deployment requirements (fresh install vs. upgrade) if any
• system requirements: memory, CPU, desk space, etc
• interoperability and compatibility requirements:
  • OS
  • xenserver, hypervisors
  • storage, networks, other
• list localization and internationalization specifications 
• explain the impact and possible upgrade/migration solution introduced by the feature 
• explain performance & scalability implications when feature is used from small scale to large scale
• explain security specifications
  • list your evaluation of possible security attacks against the feature and the answers in your design* *
• explain marketing specifications
• explain levels or types of users communities of this feature (e.g. admin, user, etc)

Use cases

put the relevant use case/stories to explain how the feature is going to be used/work

Architecture and Design description

• The implementation as described above is pretty straight forward, the only substantial work is in VpcServiceImpl.createVpcPrivateGateway. NetworkDao needs an extra parameter to pass the networkoffering to getPrivateNetwork.

• discussion of alternatives amongst design ideas, their resources/time tradeoffs and limitations. Explain why a certain design idea is chosen over others
• highlight architectural patterns being used (queues, async/sync, state machines, etc)
• talk about main algorithms used
• explain what components are being changed and what the dependent components are
• regarding database: talk about tables being added/modified
• performance implications: what are the improvements or risks introduced to capacity, response time, resources usage and other relevant KPIs
• preferably show class diagrams, sequence diagrams and state diagrams
• if possible, publish signatures of all methods classes and interfaces implement, and the explain the object information of different classes

Web Services APIs

list changes to existing web services APIs and new APIs introduced with signatures and throughout documentation

UI flow

• either demonstrate it visually here or link to relevant mockups

IP Clearance

• what dependencies will you be adding to the project?
• are you expecting to include any code developed outside the Apache CloudStack project?

Appendix

Appendix A:

Appendix B: