OpenStack NFV Orchestration服务，暨OpenStack Tacker入门指南

ゝ一世哀愁。 2022-07-13 15:55 327阅读 0赞

OpenStack NFV Orchestration服务(OpenStack Tacker)用以构建GVNFM和NFVO，从而能够支持在NFVI平台上（如OpenStack）部署和操作网络服务（NS）和虚拟网络功能（VNF）。  
OpenStack NFV Orchestration服务遵循ETSI-GS MANO Architecture Framework标准，提供一个功能栈，以将VNF装配成端对端的网络服务。  
OpenStack NFV Orchestration服务的当前版本v1.0，Python实现，最早随OpenStack Liberty版本发布。  
1. OpenStack NFV Orchestration的组成部分  
1)NFV Catalog

*  NS Descriptors，描述多个网络服务的动态组合
 *  VNF Descriptors，描述单个VNF
 *  VNF Forwarding Graph Descriptors (VNFFGD)，描述VNF之间的流量关系

2)VNFM

*  life-cycle of VNF
 *  Facilitate initial configuration
 *  placement of high-performance NFV workloads
 *  Health monitoring
 *  Auto Healing / Auto Scaling VNFs

3)NFVO

*  Templatized end-to-end Network Service deployment
 *  VNF placement policy
 *  VNFs connected
 *  VIM Resource Checks and Resource Allocation
 *  Orchestrate VNFs across Multiple VIMs and Multiple Sites

2. OpenStack NFV Orchestration服务的基本工作流程  
1)利用镜像文件实例化一个VM（即VDU, Virtual Deployment Unit）  
2)在VDU中创建或获取YAML模板文件  
3)Onboarding VNF，即基于YAML模板文件创建VNFD，并得到VNFD ID

tacker vnfd-create --vnfd-file sample-vnfd.yaml <VNFD_NAME>

4)Deploying VNF  
5)通过VNFD创建VNF

tacker vnf-create --vnfd-id <VNFD_ID> <VNF_NAME>
    或
    tacker vnf-create --vnfd-name <VNFD_NAME> <VNF_NAME>

6)直接通过YAML模板文件创建VNF

tacker vnf-create --vnfd-template sample-vnfd-hello-world.yaml <VNF_NAME>

7)操作VNF实例

tacker vim-list
    tacker vnfd-list
    tacker vnf-list
    tacker vnf-show <VNF_ID>
    tacker vnfd-show <VNFD_ID>

8)删除VNF和VNFD

tacker vnf-delete <VNF_ID/NAME>
    tacker vnfd-delete <VNFD_ID/NAME>

3. OpenStack NFV Orchestration服务的APIs

*  /
 *  /v1.0/extensions
 *    
    
 *  /v1.0/vnfds
 *  /v1.0/vnfs
 *    
    
 *  /v1.0/vims, controlling and managing Network Function Virtualization Infrastructure (NFVI) 
 *    
    
 *  /v1.0/events
 *    
    
 *  /v1.0/vnffgds
 *  /v1.0/vnffgs
 *    
    
 *  /v1.0/nfps, Network Forwarding Paths (NFPs), a component of VNFFG and contains a Service Function Chain (SFC) and a classifier
 *  /v1.0/classifiers, a component of a NFP and defines policies to distinguish which traffic should enter the related SFC
 *  /v1.0/sfcs, Service Function Chains (SFCs)
 *    
    
 *  /v1.0/nsds, Network Service Descriptors, a TOSCA template that describes the deployment and behaviour of a Network Service (NS) using a collection of VNFs
 *  /v1.0/nss, Network Servicess (NSs), NS resources are instantiations of network services described in the associated NSD TOSCA template.

4. VNFC扩展:

OpenStack NFV Orchestration服务不满足于通过镜像文件预定义的网络功能，还可以通过VNFC实现灵活配置的网络功能。  
VNF Component (VNFC)是一种定义网络功能的软件，部署在VDU中。

5. 参考文献

https://wiki.openstack.org/wiki/Tacker  
http://specs.openstack.org/openstack/tacker-specs/  
https://docs.openstack.org/developer/tacker/  
https://github.com/openstack/tacker  
https://developer.openstack.org/api-ref/nfv-orchestration/v1/