DCAE Transformation to support Helm (Phase2)

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Description of Use Case / Requirement:

DCAE Architecture includes currently DCAE Platform and DCAE Services component (collector/analytics etc). DCAE platform provides LCM (through Cloudify workflows) and several standardized functions for DCAE services such as 

• Configuration management and retrieval through CBS
• DMaap Topic provisioning
• Policy Interaction abstracted and managed by Policy Handler
• Postgres DB initialization

Goal of the transformation  is to offer these platform function as k8s based function (using k8s operator/sidecar/init-container etc) and enable onboarding and deployment of DCAE MS through helm directly, thereby simplifying the DCAE architecture and removing 3rd party component dependencies.

Primary Tranformation goals :

• Decentrailization of platform functions 
• Remove centralized configuration management (and enable application use K8S configmap)
• Facilitate flexible onboarding and deployment of DCAE services
• CI/CD based workflow automation
• Moving toward Cloud Native options for supporting current platform capabilities

**This will be multi-release effort and work per release will be scoped based on community support.

In Phase1 (H release) , certaiin DCAE service were migrated to Helm deployment (tracked under DCAEGEN-2488/REQ-479),  Cloudify was primary orchestration for dynamic deployments (MOD/CLAMP flows). This REQ is for tracking items deferred from initial scope (due to time/resource constraint) and progress on transformation initatives. 

For Phase2 (Istanbul release), below features are being considered.

• [DCAE] Migrating remaining DCAE services into Helm deployment
  • Application configuration containing password must be handled through secrets
• [DMAAP/OOM] Secure Topic/feedprovisioning under helm deployment
• [INTEGRATION] Integration & gating test to leverage DCAE service component helm charts for functional/usecase validation
• [Policy] CLAMP/Control Loop design for Helm based deployment
• [DCAE] Standardized App Configuration (including Policy, Dmaap etc.) management
• [OOM] On-demand DCAE helm services deployments through OOM/Helm service (or K8Splugin/EMCO integration)
• [DCAE-MOD] MOD support for onboarding helm based services and integration with ONAP deployment
  • MOD support for composite flows creation
  • MOD support for helm artifact generation

Note: Exact I release scope will be finalized towards M2 based on resource availability

Owners (one of these should be the Assignee - use @ notation):

vv770d, jackl

Link to HLD/LLD (if any):

 https://wiki.onap.org/pages/viewpage.action?pageId=92997528

Dependency Relationships with Other Projects:

DCAE IMPACT: C

• Impact Type: C
• Company Engagement:  AT&T, Nokia, Ericsson, Wipro
• Resources:  X
• Support Status: S
• Non-Functional Requirement Support: TBD

OOM/DMAAP IMPACT: C

• Impact Type: C
• Company Engagement:  Ericsson 
• Resources:  X
• Support Status: S
• Non-Functional Requirement Support: TBD

INTEGRATION IMPACT:C  

• Impact Type: C
• Company Engagement:  Nokia
• Resources:  X
• Support Status: S
• Non-Functional Requirement Support: TBD

 POLICY(CLAMP) IMPACT:C  (POC)

•  Policy/CLAMP project work for DCAE integration will covered under REQ-716 (CL Tosca)

Integration Leads (use @ notation): TBD