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Towards Seamless Live Migration in SDN-Based Data Centers
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013). (Distributed systems and communication, DISCO)ORCID iD: 0000-0001-9866-8209
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Live migration of Virtual Machines (VMs) has significantly improved the flexibility of modern Data Centers (DCs). Ideally, live migration ought to be seamless which in turn raises challenges on how to minimize service disruption and avoid performance degradation. To address these challenges, a comprehensive support from the underlying network is required. However, legacy DC networks fall short to help as they take a reactive approach to live migration procedure. Moreover, the complexity and inflexibility of legacy DC networks make it difficult to deploy, manage, and improve network technologies that DC providers may need to use for migration.

In this thesis, we explore the application of Software Defined Networking (SDN) paradigm for making live VM migration more seamless. Exploiting the characteristics of SDN such as its centralized view on network states, we contribute to the body of knowledge by enhancing the quality of intra- and inter-DC live migration. Firstly, for intra-DC migration, we provide an SDN-based solution which minimizes the service disruption by employing OpenFlow-based resiliency mechanisms to prepare a DC network for migration proactively. Secondly, we improve the inter-DC live migration by accelerating the network convergence through announcing the migration in the control plane using MP-BGP protocol. Further, our proposed framework resolves the sub-optimal routing problem by conducting the gateway functionality at the SDN controller. Finally, with the ultimate goal of improving the inter-DC migration, we develop an SDN-based framework which automates the deployment, improves the management, enhances the performance, and increases the scalability of interconnections among DCs.

Abstract [en]

Live migration of Virtual Machines (VMs) has significantly improved the flexibility of modern Data Centers (DCs). Ideally, live migration ought to be seamless which requires a comprehensive support from the underlying network. However, legacy DC networks fall short to address the challenges of migration due to their inflexible and decentralized characteristics. In contrast, Software Defined Networking (SDN) is a new networking paradigm, which has the potential to improve the live migration thanks to its comprehensive view over the network, flexible structure, and its close integration with DC management infrastructures.

This thesis investigates networking challenges of short and long-haul live VM migration in SDN-based DCs. We propose solutions to make the intra- and inter-DC live migration procedures more seamless. Furthermore, our proposed SDN-based framework for inter-DC migration improves the management, enhances the performance, and increases the scalability of interconnections among DCs.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2018. , p. 25
Series
Karlstad University Studies, ISSN 1403-8099 ; 2018:55
Keywords [en]
Data Center, Data Center Interconnection, EVPN, SDN, VM Migration
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-70166ISBN: 978-91-7063-896-1 (print)ISBN: 978-91-7063-991-3 (print)OAI: oai:DiVA.org:kau-70166DiVA, id: diva2:1264102
Presentation
2018-12-19, Universitetsgatan 2, Karlstad, 09:15 (English)
Opponent
Supervisors
Available from: 2018-11-28 Created: 2018-11-19 Last updated: 2018-11-28Bibliographically approved
List of papers
1. Minimizing Live VM Migration Downtime Using OpenFlow based Resiliency Mechanisms
Open this publication in new window or tab >>Minimizing Live VM Migration Downtime Using OpenFlow based Resiliency Mechanisms
2016 (English)In: Cloud Networking (Cloudnet), 2016 5th IEEE International Conference on, IEEE Communications Society, 2016Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
IEEE Communications Society, 2016
National Category
Computer Sciences
Research subject
Computer Science; Computer Science
Identifiers
urn:nbn:se:kau:diva-47744 (URN)10.1109/CloudNet.2016.17 (DOI)000391421700005 ()
Conference
IEEE CloudNet 2016 - 5th IEEE International Conference on Cloud Networking, Pisa, Italy, 3-5 Oct. 2016
Projects
HITS
Funder
Knowledge Foundation
Available from: 2017-01-26 Created: 2017-01-26 Last updated: 2018-11-19Bibliographically approved
2. Automating Ethernet VPN deployment in SDN-based Data Centers
Open this publication in new window or tab >>Automating Ethernet VPN deployment in SDN-based Data Centers
Show others...
2017 (English)In: 2017 Fourth International Conference on Software Defined Systems (SDS)., IEEE, 2017, p. 61-66Conference paper, Published paper (Refereed)
Abstract [en]

Layer 2 Virtual Private Network (L2VPN) is widely deployed in both service provider networks and enterprises. However, legacy L2VPN solutions have scalability limitations in the context of Data Center (DC) interconnection and networking which require new approaches that address the requirements of service providers for virtual private cloud services. Recently, Ethernet VPN (EVPN) has been proposed to address many of those concerns and vendors started to deploy EVPN based solutions in DC edge routers. However, manual configuration leads to a time-consuming, error-prone configuration and high operational costs. Automating the EVPN deployment from cloud platforms such as OpenStack enhances both the deployment and flexibility of EVPN Instances (EVIs). This paper proposes a Software Defined Network (SDN) based framework that automates the EVPN deployment and management inside SDN-based DCs using OpenStack and OpenDaylight (ODL). We implemented and extended several modules inside ODL controller to manage and interact with EVIs and an interface to OpenStack that allows the deployment and configuration of EVIs. We conclude with scalability analysis of our solution.

Place, publisher, year, edition, pages
IEEE, 2017
Keywords
cloud computing, computer centres, local area networks, software defined networking, virtual private networks
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-65144 (URN)10.1109/SDS.2017.7939142 (DOI)000405190400010 ()978-1-5386-2855-3 (ISBN)
Conference
Fourth International Conference on Software Defined Systems (SDS) 2017. 8-11 May, 2017. Valencia, Spain.
Projects
HITS
Funder
Knowledge Foundation
Available from: 2017-11-09 Created: 2017-11-09 Last updated: 2018-11-19Bibliographically approved
3. Policy-based routing and load balancing for EVPN-based data center interconnections
Open this publication in new window or tab >>Policy-based routing and load balancing for EVPN-based data center interconnections
Show others...
2017 (English)In: Network Function Virtualization and Software Defined Networks (NFV-SDN), 2017 IEEE Conference on Network Function Virtualization and Software Defined Networks (NFV-SDN), IEEE, 2017Conference paper, Published paper (Refereed)
Abstract [en]

The Ethernet VPN (EVPN) technology has emerged as a key solution for the interconnection of geo-distributed Data Centers (DCs) over provider-managed MPLS networks. Such interconnections need to satisfy service-level agreements, which can be achieved by enforcing Traffic Engineering (TE) policies. However, deploying an effective TE policy is challenging and complex. This stems from the fact that network administrators should have a detailed insight into the network status and protocol specifics. Software-Defined Networking (SDN) may facilitate both the policy definition and deployment based on its comprehensive network view and existing integration with DC management systems, such as OpenStack. This paper presents an SDN-based framework for policy-driven DC interconnections that are built around EVPN. The framework is designed to translate routing and other TE policies, which are defined for EVPN instances, into appropriate low-level network actions to meet the policy goals. A generic programming interface allows an SDN controller to load different TE strategies so as to implement the policy, without the need to hard-code it. Moreover, our evaluations illustrate how clients might benefit from specific TE strategies and what is their impact on network performance

Place, publisher, year, edition, pages
IEEE, 2017
Keywords
Cloud Networking, Ethernet Virtual Private Network (EVPN), Software-Defined Networking (SDN), Routing Policy Management, OpenStack, OpenDaylight
National Category
Computer Sciences Software Engineering Telecommunications
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-65600 (URN)10.1109/NFV-SDN.2017.8169841 (DOI)000426936400019 ()978-1-5386-3285-7 (ISBN)
Conference
2017 IEEE Conference on Network Function Virtualization and Software Defined Networks (NFV-SDN), 6-8 Nov. 2017, Berlin, Germany
Available from: 2018-01-15 Created: 2018-01-15 Last updated: 2018-11-19Bibliographically approved
4. SDN Enhanced Ethernet VPN for Data Center Interconnect
Open this publication in new window or tab >>SDN Enhanced Ethernet VPN for Data Center Interconnect
2017 (English)In: 2017 IEEE 6th International Conference on Cloud Networking (CloudNet) / [ed] Maga, D, IEEE, 2017, p. 77-82Conference paper, Published paper (Refereed)
Abstract [en]

Ethernet Virtual Private Network (EVPN) is an emerging technology that addresses the networking challenges presented by geo-distributed Data Centers (DCs). One of the major advantages of EVPN over legacy layer 2 VPN solutions is providing All-Active (A-A) mode of operation so that the traffic can truly be multi-homed on Provider Edge (PE) routers. However, A-A mode of operation introduces new challenges. In the case where the Customer Edge (CE) router is multi-homed to one or more PE routers, it is necessary that only one of the PE routers should forward Broadcast, Unknown unicast, and Multicast (BUM) traffic into the DC. The PE router that assumes the primary role for forwarding BUM traffic to the CE device is called the Designated Forwarder (DF). The proposed solution to select the DF in the EVPN standard is based on a distributed algorithm which has a number of drawbacks such as unfairness and intermittent behavior. In this paper, we introduce a Software-Defined Networking (SDN) based architecture for EVPN support, where the SDN controller interacts with EVPN control plane. We demonstrate how our solution mitigates existing problems for DF selection which leads to improved EVPN performance.

Place, publisher, year, edition, pages
IEEE, 2017
Series
IEEE International Conference on Cloud Networking, ISSN 2374-3239
National Category
Computer Sciences Software Engineering Telecommunications
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-66892 (URN)10.1109/CloudNet.2017.8071535 (DOI)000426957400013 ()978-1-5090-4026-1 (ISBN)
Conference
IEEE 6th International Conference on Cloud Networking (CloudNet), SEP 25-27, 2017, Prague, Czech republic
Available from: 2018-03-29 Created: 2018-03-29 Last updated: 2018-11-19Bibliographically approved
5. EVPN/SDN Assisted Live VM Migration between Geo-Distributed Data Centers
Open this publication in new window or tab >>EVPN/SDN Assisted Live VM Migration between Geo-Distributed Data Centers
2018 (English)In: 4th IEEE Conference on Network Softwarization (NetSoft), 2018, p. 105-113Conference paper, Published paper (Refereed)
Abstract [en]

Live Virtual Machine (VM) migration has significantly improved the flexibility of modern Data Centers (DC). However, seamless live migration of a VM between geo-distributed DCs faces several challenges due to difficulties in preserving the network configuration after the migration paired with a large network convergence time. Although SDN-based approaches can speed up network convergence time, these techniques have two limitations. First, they typically react to the new topology by installing new flow rules once the migration is finished. Second, because the WAN is typically not under SDN control, they result in sub-optimal routing thus severely degrading the network performance once the VM is attached at the new location.

In this paper, we identify networking challenges for VM migration across geo-distributed DCs. Based on those observations, we design a novel long-haul VM migration scheme that overcomes those limitations. First, instead of reactively restoring connectivity after the migration, our SDN-based approach proactively restores flows across the WAN towards the new location with the help of EVPN and VXLAN overlay technologies. Second, the SDN controller accelerates the network convergence by announcing the migration to other controllers using MP-BGP control plane messages. Finally, the SDN controller resolves the sub-optimal routing problem that arises as a result of migration implementing a distributed anycast gateway. We implement our approach as extensions to the OpenDaylight controller. Our evaluation shows that our approach outperforms existing approaches in reducing the downtime by 400 ms and increasing the application performance up to 12 times.

Keywords
Data Center, Ethernet VPN, Software Defined Networks, Distributed Gateway, VM Migration
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-70164 (URN)10.1109/NETSOFT.2018.8459946 (DOI)978-1-5386-4633-5 (ISBN)
Conference
4th IEEE Conference on Network Softwarization and Workshops (NetSoft), Montreal, Canada, June 25-29, 2018.
Projects
HITS
Funder
Knowledge Foundation
Available from: 2018-11-19 Created: 2018-11-19 Last updated: 2018-11-22Bibliographically approved

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Alizadeh Noghani, Kyoomars

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