臺灣博碩士論文加值系統

服務功能鏈（SFC – Service Function Chain）能使網路封包有序地通過預先定義鏈接的虛擬網路功能（VNF – Virtual Network Function），在本研究中，我們提出了服務功能鏈的動態故障管理方法。我們提出的方法不需預先建立任何備用的VNF或備用服務路徑（SFP – Service Function Path）。 我們的監控系統將監控服務功能鏈使用的所有VNF，如果一VNF停止服務，我們的系統將創建一個與故障之VNF相同功能的VNF來取代之。更重要的是，系統將採用容器（Container）技術來加速VNF的生成時間。與現有的使用虛擬機（VM）進行自我修復的方法相比，我們提出的解決方案能在多消耗可接受的資源的情況下，實現更快的修復時間。

Service Function Chaining (SFC) is an important mechanism in Software-Defined Network/Network Function Virtualization (SDN/NFV) to allow the network traffic to be forwarded through a pre-defined ordered set of Virtual Network Functions (VNFs). Nevertheless, such a chain will be broken with the failure of a VNF. In this research, we propose a novel fault management system that can rapidly and dynamically recover a SFC from a failed VNF. In our proposed system, no backup VNF or backup Service Function Path need be established in advance. Our system will monitor all the VNFs used by SFC and when there is a VNF out of service, it will dynamically create a new VNF with the same functionality as that of the failed one and replace it. Unlike existing solutions of fault-recovery using virtual machines, our system employs container technologies to speed up the instantiation and replacement of VNFs. When compared to the existing method, our proposed solution is capable of achieving much faster recovery time with acceptable cost of resource consumption.

List of Figures v
List of Tables vi
Chapter 1 Introduction 1
1.1 Motivation 1
1.2 Contribution 2
1.3 Thesis Organization 3
Chapter 2 Background 4
2.1 ETSI NFV Architectural Framework 4
2.2 Service Function Chaining 6
2.3 Related Research 9
2.4 Related Software 11
Chapter 3 Design and Implementation of Proposed System 17
3.1 System Architecture 17
3.2 Steps in Service Function Chain Fault Management 19
3.3 System Implementation 21
Chapter 4 System Evaluation 26
4.1 Experiment Environment 27
4.2 Total Recovery Time 31
4.3 Average CPU Usage 32
4.4 Observation and Analysis 35
Chapter 5 Conclusion and Future Work 36
References 37
Appendix A: Testing Results 41

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[10] OpenStack: https://www.openstack.org
[11] Kubernetes: https://kubernetes.io
[12] OpenStack Tacker: https://wiki.openstack.org/wiki/Tacker
[13] Networking-sfc: https://docs.openstack.org/networking-sfc/rocky/
[14] ETSI NFV GS 002: https://www.etsi.org/deliver/etsi_gs/NFV/001_099/002/01.02.01_60/gs_NFV002v010201p.pdf
[15] IETF RFC 7665: https://tools.ietf.org/html/rfc7665
[16] Multisite VIM in Tacker: https://docs.openstack.org/tacker/latest/user/multisite_vim_usage_guide.html
[17] OPNFV SFC Release draft: https://artifacts.opnfv.org/sfc/docs/design/design.pdf
[18] IETF RFC 8300: https://tools.ietf.org/html/rfc8300
[19] TOSCA: https://cloudify.co/2015/07/21/what-is-TOSCA-cloud-application-orchestration-tutorial-cloudify.html
[20] Kuryr: https://wiki.openstack.org/wiki/Kuryr
[21] Kuryr-Kubernetes: https://docs.openstack.org/kuryr-kubernetes/latest/readme.html
[22] Python-tackerclient: https://docs.openstack.org/python-tackerclient/latest/
[23] RFC 792: https://tools.ietf.org/html/rfc792
[24] Demilitarized Zone: http://www.infosecwriters.com/Papers/jwebb_network_demilitarized_zone.pdf
[25] Psutil: https://pypi.org/project/psutil/