Development of template management technology for easy deployment of virtual resources on OpenStack
© Yamato et al. 2014
Received: 24 January 2014
Accepted: 15 May 2014
Published: 14 June 2014
In this paper, we describe the development of template management technology to build virtual resources environments on OpenStack. In recent days, Cloud computing has been progressed and also open source Cloud software has become widespread. Authors are developing cloud services using OpenStack. There are technologies which deploy a set of virtual resources based on system environmental templates to enable easy building, expansion or migration of cloud resources. OpenStack Heat and Amazon CloudFormation are template deployment technologies and build stacks which are sets of virtual resources based on templates. However, these existing technologies have 4 problems. Heat and CloudFormation transaction managements of stack create or update are insufficient. Heat and CloudFormation do not have sharing mechanism of templates. Heat cannot extract templates from existing virtual environments. Heat does not reflect actual environment changes to stack information. Therefore, we propose a new template management technology with 4 improvements. It has a mechanism of transaction management like roll back or roll forward in case of abnormal failure during stack operations. It shares templates among end users and System Integrators. It extracts templates from existing environments. It reflects actual environment changes to stack information. We implemented the proposed template management server and showed that end users can easily replicate or build virtual resources environments. Furthermore, we measured the performance of template extraction, stack create and update and showed our method could process templates in a sufficient short time.
KeywordsOpenStack Cloud computing IaaS Template management server Heat CloudFormation
In recent days, Cloud computing technologies such as virtualization and scale-out have been progressed and many providers have started Cloud services. Cloud services are divided into SaaS, PaaS and IaaS (Infrastructure as a Service). IaaS service provides hardware resources of CPU or Disk via a network. For examples, Amazon EC2 (Elastic Computing Cloud) [] and Rackspace Cloud Servers [] are production IaaS services. As IaaS infrastructure, RackSpace uses open source software OpenStack []. OpenStack and CloudStack [] are major open source IaaS software and adoptions of open source IaaS software are increasing. Because OpenStack community is very active and open, we are also developing IaaS services on OpenStack.
With a spread of cloud services, technologies which deploy a set of virtual resources based on system environmental templates to enable easy building, expansion, migration of cloud virtual resources have emerged. For example, OpenStack Heat [] and Amazon CloudFormation [] are template deployment technologies and build stacks which are sets of virtual resources based on templates. However, these existing technologies have 4 problems. Heat and CloudFormation transaction managements of stack create or update are insufficient. Heat and CloudFormation do not have sharing mechanism of templates. Heat cannot extract templates from existing virtual environments. Heat does not reflect actual environment changes such as virtual machine deletion by OpenStack Nova API to stack information.
Therefore, we propose a new template management technology which has a mechanism of transaction management like roll back or roll forward in case of abnormal failure during stack operations, template sharing among end users and System Integrators, template extraction from existing environments and reflection of actual environment change to stack information. We implemented the proposed template management (TM) server and showed that end users can easily replicate or build virtual resources environments. Furthermore, we measured the performance of template extraction, stack create and update and showed our method could process templates in a sufficient short time.
The rest of this paper is organized as follows. In Problems of existing template technologies, we review OpenStack architecture and clarify problems of existing template technologies for business use. In Proposal of template management technology, we propose a new template management technology which mediates users and OpenStack, and show how to resolve existing problems. In Template management server evaluation, we implement the TM server, confirm our proposed methods feasibility and evaluate the performance. We compare our work to related works in Related works. We summarize the paper in Conclusion.
Problems of existing template technologies
Outline of OpenStack
OpenStack is composed of the function blocks which manage logical/virtual resources deployed on physical resources, the function block which provides Single Sign On authentication among other function blocks and the function block which orchestrates a set of virtual resources. Neutron controls virtual networks. OVS (Open Virtual Switch) [] and other software switches can be used as a virtual switch. Nova controls virtual machines (VMs). KVM (Kernel based Virtual Machine) [], Xen [] and others can be used as hypervisors of VMs. Cinder manages block storages and can attach a logical volume to a VM like a local disk. Swift manages object storages. Glance manages Image files. Keystone is a base which performs Single Sign On authentications of these function blocks. Heat is an orchestration deployment function to create or update virtual resource instances using Nova, Cinder or other blocks based on a text template. Ceilometer is a metering function of virtual resource usage. The functions of OpenStack are used through REST (Representational State Transfer) APIs. There is also Web GUI called Horizon to use the functions of OpenStack.
OpenStack major version is released once a half-year. Henceforth Havana which is the latest version in Feb of 2014, the new functions to catch-up Amazon EC2 will be added.
Clarification of existing template technologies problems
OpenStack Heat and Amazon CloudFormation are technologies which deploy virtual resource instances based on templates which contain information of virtual resource environment and are described by JSON, YAML or other text format. The scope of Heat and CloudFormation are same and Heat supports CloudFormation-compatible API and template format. Both call a set of virtual instances which are deployed based on a template “stack” and provide APIs to operate stacks. However, these APIs provide primitive CRUD (Create, Read, Update and Delete) operations of stack and there are some insufficient points for business use. Here, we clarify 4 major problems of existing template technologies.
Insufficient transaction management of stack create, update or delete
Heat and CloudFormation transaction managements of stack create, update or delete are insufficient. When we create a stack, all resources need to be deployed successfully for business use. But Heat and CloudFormation sometimes fail some resources deployment and there is a possibility of end up with a half-finished stack creation. Moreover, when we update a stack, Heat and CloudFormation also fail some resources update and there is a possibility of end up with a half-finished stack update.
There is no template sharing mechanism
Templates sharing or re-use by other users are out of scope of Heat and CloudFormation. Users of Heat and CloudFormation need to describe and manage templates by themselves. However, users who do not have IT knowledge such as small business owners cannot create a template easily. It is preferable that System Integrators or distributers describe and verify templates, and end users only select templates and build virtual resource environments for their business demands.
Heat cannot extract templates from existing environments
Heat has a “template-show” API which gets a template from a stack but cannot extract a template from a non-stack environment. Thus, when users would like to replicate existing environments, they need to describe templates from the first. And because each resource belongs to only one stack in Heat specification, a template extraction is difficult for shared resources such as logical routers which connect VPN or the Internet not to belong multiple stacks.
Actual environment change is not reflected to stack information
Heat does not reflect non-Heat API operations to stack information. For example, when users shut down a VM via console or delete a VM via Nova API, there is a difference between an actual environment and stack information. When users call a stack update API, Heat checks a difference between a new template and a previous template. But in this example case, an actual environment is different from a previous template, so that there is a possibility of unexpected behavior.
Proposal of template management technology
To provide orchestration functions of OpenStack IaaS services to users, we propose a TM server which have a mechanism of transaction management like roll back or roll forward in case of abnormal failure during stack operations, template sharing among end users and System Integrators, template extraction from existing environments and reflection of actual environment change to stack information. The TM server interprets Heat JSON or HOT (Heat Orchestration Template) format templates and calls OpenStack APIs such as Nova or Cinder. The TM server has a stack operation function, template sharing function, template extraction function and environmental change reflection function. Here, we explain how to resolve 1–4 problems by the TM server.
Transaction management of stack create, update and delete
Heat and CloudFormation transaction managements of stack create, update and delete are insufficient and may end up with a half-finished stack processing. It is not acceptable for some business users because some resources failures may lead critical problems. For example, if a VM creation is successful but a logical router security setting is failed, the VM may have a risk of abuse.
Therefore, when we create a stack, it is necessary to delete and roll back all resources in case of any failures of resource creation (All resources roll back). And when we delete a stack, it is necessary to retry and delete all resources in case of any failures of resource deletion (All resources roll forward).
When we update a stack, orchestration functions check a difference between previous template and new template, then create, delete or update resources to fill up the difference. Specifically, a resource which is in previous template and is not in new template is deleted, a resource which is not in previous template and is in new template is created, a resource which is changed from previous template to new template is created after deletion or updated. In OpenStack, some resources can be updated but some cannot be. (e.g. network connection change can be updated but VM RAM size change needs to delete VM once, then create new one).
In stack update case, individual resource creation, deletion and update may be operated, so that there may be a case we cannot roll back all operations. For example, a volume is deleted successfully then a VM creation is failed, we cannot roll back because the volume is already deleted. Therefore, in stack update case, the TM server tries to roll back or roll forward for each OpenStack API transaction (not all API transactions) when each OpenStack API processing is failed.
Heat template does not describe an order of each resource processing. Our TM server interprets Heat templates and process following orders for stack create, delete and update. Regarding to stack create, the TM server creates resources in the following order; volume, virtual Layer 2 network, VM, logical router and logical load balancer. Regarding to stack delete, the order is logical load balancer, logical router, VM, virtual Layer 2 network and volume. Regarding to stack update, the TM server firstly deletes resources in the order same as stack delete case, secondly creates resources in the order same as stack create case and lastly updates resources in the order same as stack create case. Figure 2 also shows the orders of stack create, delete and update.
Following these orders, we can guarantee the precondition of resource creation in stack create case (e.g. a VM needs at least one volume). We can also prevent name duplication error or other precondition error in stack update case.
To follow these policies, the stack operation function of TM server manages orders of OpenStack API calls and those transactions. Because most of OpenStack APIs are asynchronous, the TM server retries a API or calls a purge API, or reverse API to decide state of OpenStack resource when a API transaction is failed. Note that a reverse API means the reverse process of each API (e.g. volume deletion API is a reverse API for volume creation). In this way, we can prevent a half-way state of stack during stack operations.
The function of stack transaction management can be generalized for deployment management with multiple resources. Resource deployment needs Create, Update and Delete transaction managements and also needs a valid order of each resource operation. Our proposal of stack transactions in case of failure and orders of each resource operation can be used also CloudStack, Eucalyptus and other Cloud platforms multiple resources provisioning because a virtual resource dependence (e.g. VM needs at least one volume) is almost same in IaaS platforms.
CloudFormation and Heat do not have a mechanism of template sharing. Our TM server provides a function to share templates and facilitate templates re-use. For example, when a small business owner would like to build a shopping site, a System Integrator provides a verified Web 3-tier structure template, then the small business owner selects the template and build the environment with one or two clicks. If we share templates unconditionally, there is a risk of malicious template spreading. Thus, it is necessary to limit a range of template sharing within contractual relationships. Here, we explain logics of template sharing.
- There are two methods to register a template: template extraction and template upload. The function described in Template extraction from existing tenant extracts a valid template in an extraction case. In the other side, the template sharing function validates a template in a template upload case because a template described by a user may have format or logical errors.
- Each template creator can set a scope of disclosure for each template. There are 3 options for disclosure; only the creator-self, all users who have contract with the creator and users selected by the creator. Service providers or System Integrators can share templates to subordinate users by setting a scope of disclosure. If System Integrators have multiple tier contractual relationships, there are 2nd tier subordinate users. In this case, 1st tier subordinate System Integrator downloads a template of upper tier System Integrator and registers it as its template. This is to restrict scope of disclosure within direct contractual relationships. Because each System Integrator prefers to sell its own brand, the template sharing function conceals templates upper than two tiers. Figure 3 shows an image of template sharing relations. A Cloud provider A creates and shares the template a to all users which have contracts. A System Integrator B and an End User C can use the template a. B also creates and shares the template b to users, so that D and E can use the template b.
In this way, users who do not have enough IT knowledge can select a shared template and build virtual resources environments easily.
The function of template sharing function shares a template among users. In Cloud services or hosting services, many System Integrators or resellers build and manage services for end users. The function of template sharing is generalized for multi-tier sharing model of cloud or hosting services. This can be used not only a text template file sharing but also restricted sharing of software with license such as OS images or restricted codes sharing for multi-vendor developments.
Template extraction from existing tenant
Heat main targets are operations of stacks and Heat cannot extract a template from non-stack environment. And there is a restriction that each virtual resource belongs to only one stack. Based on them, we propose logics to extract a template from an existing tenant.
- We extract whole virtual resources on an existing tenant to a template. If there is unnecessary resource in an extracted template, a user edits the template after downloading. This is because there is no stack that we cannot restrict corresponding resources for extraction.
Target resources to extract are volumes, virtual Layer 2 networks, VMs, logical routers and logical load balancers. Floating IPs are IP address resources that relate logical routers which connect the Internet. The Internet connected resources are shared by multiple stacks in general and VMs or logical load balancers which are assigned floating IPs may be shared by multiple stacks. Because a virtual resource only belongs to one stack, we do not include a floating IP to a template in extraction phase. Users can assign floating IPs after stack creation based on the extracted template. In the same way, shared virtual Layer 2 networks or logical routers (e.g. VPN connected routers) are out of scope for extraction because those are used by multiple stacks.
- When users extract a template, they also can select whether to acquire images from volumes of tenant or not. When users create a stack, these images are used to replicate volumes.
- During template extraction time, we block virtual resources operations in the tenant to prevent a change of target resources for extraction.
- Extracted templates are held in the template sharing function described in Template sharing. Extracted templates can be used for stack create, update or download to edit.
In this way, we can extract a template from an existing tenant and replicate an environment easily.
The function of template extraction extracts a template from an existing environment. Our implementation extracts JSON or HOT template and the extracted template can be deployed both by Amazon CloudFormation and OpenStack Heat because a template is abstract text information and does not depend on IaaS platform. To generalize and adapt extracted template format to other IaaS platforms, we can use this function for Cloud migration to another platform or Cloud federation on plural platforms.
Reflection of environment change to stack information
In case of stack update, orchestration functions check a difference between previous template and new template, then create, delete or update virtual resources to fill up the difference. However, Heat can only recognize an environment change by Heat API and does not know actual environment status.
Therefore, we reflect an environment change to stack information to guarantee stack update or delete behaviors as users expect.
Stack create, update, delete by Heat Stack API
Individual resource create, update, delete by other OpenStack API (Nova, Cinder and so on)
Resource deletion by user’s manual operation. (e.g. VM shutdown via console)
Resource deletion by unintentional physical or virtual server down.
Regarding to a), we do not have to care it because templates of Stack API are matched to actual environments after API process.
Regarding to b), when users call OpenStack API (not Heat API), the TM server hooks the requests as OpenStack API proxy and reflects the environment change to stack information. If proxy model is difficult, the TM server may poll OpenStack DB to confirm environment changes. But each OpenStack API does not have a parameter of stack ID so that individual resource creation is not reflected to stack information. If a user would like to add a resource to a stack, a user needs to call Heat stack update API including the resource.
Regarding to c), main case is a VM shutdown by user’s manual operation. VM is operated by Libvirt [] on KVM. Therefore, the TM server can reflect the VM down status to stack information by receiving notifications of Libvirt or other monitoring agents.
Regarding to d), the TM server reflects resources down to stack information by receiving a notification of each resource monitoring agent like c) case.
Reflection of actual environment change to stack information
Our TM server
Heat stack API
Other OpenStack API (Nova, Cinder and so on)
User manual operation (e.g. VM shutdown)
Physical or virtual server down
The function of environment change reflection function is generalized to a difference resolve function of actual environment and management layer. The difference has a problem not only in a stack update case but also in an individual resource provisioning case. For example, OpenStack Neutron manages a resource state in OpenStack DB and does not care an actual completion of resource provisioning after it has written the requests to DB. Thus, there is a possibility that a VM is active but access control setting of a logical router to the VM is not available. Because a Cloud provider business is charging fees for provisioned resources, it is fatal to charge a resource not created yet. The function can be used for resolving these differences to collect actual environment information by monitoring modules such as Libvirt and Pacemaker or by hooking requests as a proxy.
Template management server evaluation
We implement the TM server with proposed 1–4 functions and confirm that it can be used for carrier IaaS services. We also evaluate the performance of implemented TM server.
Template management server implementation
The stack operation function receives requests of stack create, delete and update via API, makes an order of OpenStack API calls and calls individual OpenStack API via OpenStack communication process. It manages transactions of stack operations, judges to roll-back or roll-forward and calls purge or reverse APIs via OpenStack communication process in case of a abnormal failure. The template sharing function retains templates which are extracted from existing environments or uploaded by users in template sharing DB. It also controls scope of disclosures of templates for users to search available templates. The template extraction function receives a request of template extraction via GUI, gathers information of current virtual resources from OpenStack DB and registers information of extracted template to template sharing DB. The environmental change reflection function behaves as a proxy for non-Heat OpenStack API such as Nova or Neutron API and reflects each resource status change to stack information DB. It also reflects virtual resources down to stack information DB when it receives a resource down notification from a monitoring system.
OpenStack has OpenStack DB, OpenStack modules such as Nova and OpenStack API. OpenStack receives a request via OpenStack API and controls a virtual resource using OpenStack modules like Nova or Neutron and retains virtual resource information in OpenStack DB. OSS (Operation Support System) and BSS (Business Support System) supports an operation of Cloud services. Monitoring system of OSS monitors virtual or physical resource availability and it sends a notification to the TM server when it detects a resource down.
We implemented the TM server on OpenStack Folsom. We implemented it on Ubuntu 12.04 OS and Apache Tomcat 6.0.36 by Java language (JDK188.8.131.52) and Python.
Performance evaluation of proposed method
The TM server mediates a user and OpenStack and manages a template processing. We measure the processing time of 3 type processings and confirm that an overhead of our proposed method is sufficient low. The graph values of processing time are average of 3 times measurements.
Performance measurement conditions
This subsection describes measurement conditions of what time is measured, what and how much resources are used and number of concurrent processing number in the measurements. We extract a template from a stack in the 1st measurement, create s stack using the extracted template in the 2nd measurement and update a stack by a new template in which some virtual resources are changed in the 3rd measurement.
The 1st measurement is a template extraction.
- Measured time: Template extraction processing time from a tenant.
- Extracted template: A tenant has 2 VMs, 4 volumes, 2 virtual Layer 2 networks, 1 logical router and 1 logical load balancer.
- Concurrent processing numbers: 1 and 3.
Note that processing time of Image acquisition from a volume is out of scope because it depends on network bandwidth between Cinder and Glance.
The 2nd measurement is a stack create.
- Measured time: Stack creation processing time.
- Template for stack creation: A template has 2 VMs, 4 volumes, 2 virtual Layer 2 networks, 1 logical router and 1 logical load balancer. (the same template in 1st measurement)
- Concurrent processing numbers: 1 and 3.
Note that processing time of volume creation from an image is out of scope because it depends on network bandwidth between Cinder and Glance.
The 3rd measurement is a stack update.
- Measured time: Stack update processing time.
- Differences between a previous template and a new template: virtual resources numbers are same but 1 VM, 1 virtual Layer 2 network and 1 logical router in a previous template are removed and 1 VM, 1 virtual Layer 2 network and 1 logical router are newly added. Figure 6 shows parts of templates which are used for this measurement. Both templates have a VM but VM properties are different, so that a VM is deleted firstly and another VM is created secondly in stack update.
Performance measurement environment
Figure 5 is a performance measurement environment. It shows physical and virtual servers and modules in each server. For example in TM server case, a TM server is a virtual server, is in both Internet segment and Control segment and has modules of API, Web GUI, OpenStack communicate process, tomcat and apache. Two servers are for redundancy. Other servers are a user terminal and an operator terminal, Glance application servers for image upload, a NFS storage for image, OpenStack API servers, a DB for OpenStack and TM, OpenStack servers for virtual resources such as network, volume or VM and iSCSI storages and load balancers for load balancing. Figure 5 omits maintenance servers such as syslog or backup servers and redundant modules such as heartbeat. These servers are connected with Gigabit Ethernet.
Each server specification and usage
Physical or VM
HP ProLiant BL460c G6
Quad-Core Intel Xeon 2533 MHz x 2
OpenStack API server
OpenStack stateless process such as API
Template management server
Proposed template management server
HP ProLiant BL460c G6
Quad-Core Intel Xeon 2533 MHz x 2
Glance application server
Received requests related to glance
HP ProLiant BL460c G1
DB (OpenStack & TM)
OpenStack and TM DB
Quad-Core Intel Xeon 1600 MHz x 2
HP ProLiant BL460c G1
Used for OpenStack logical network resources
Quad-Core Intel Xeon 1600 MHz x 2
HP ProLiant BL460c G1
Used for OpenStack logical volume resources
Quad-Core Intel Xeon 1600 MHz x 2
HP ProLiant BL460c G1
Used for OpenStack VM resources
Quad-Core Intel Xeon 1600 MHz x 2
Load Balancer for internal access
Xeon E5160 3.0GHz x 1
Internal Load Balancer
Load balancer for internal access
Xeon E5160 3.0GHz x 1
Xeon E5160 3.0GHz x 1
VM for user terminal
VM for operator terminal
EMC VNX 5300
iSCSI storage for user volume
EMC VNX 5300
NFS storage for Image
Performance measurement results
Template extractions need only DB checks and we can extract templates about 1–3 sec when concurrent processing numbers are 1 and 3. Because the design of system environment takes much time in general, we think quick template extraction is effective to replicate virtual resources environment.
Like OpenStack, OpenNebula [], Ecalyptus [] and CloudStack [] are open source IaaS software. OpenNebula is a virtual infrastructure manager of IaaS building. OpenNebula manages VM, storage, network of company and virtualizes system resources to provide Cloud services. Eucalyptus characteristic is an interoperability of Amazon EC2, and Xen, KVM or many hypervisors can be used on Eucalyptus. Our group also contributes to developments of OpenStack itself. Functions of load balancer and some bug fixes of OpenStack are our group contributions.
Amazon CloudFormation [] and OpenStack Heat [] are two major template deployment technologies on IaaS platform. Our work has resolved 4 problems of these technologies. The paper [] is a work of OpenStack federation using Heat and users need to describe a Heat template first. Because our work can extract templates from existing environments and reflects actual environment changes to stack information, users can replicate or federate virtual resource environments more easily. The paper [] is a work to construct multitier cloud-based services. Our work provides a mechanism of template sharing in multi-tier contracts, so that end users can build virtual resource environments using templates of upper tier System Integrators. The paper [] is a work to realize a transitional implementation of meta cloud (cloud abstraction layer) for solving cloud vendor lock-in problems. Our work also targets Cloud migration or transition and template extraction or template sharing function support it. Our work also faces transaction managements of resource deployment.
RightScale is a product for cloud service management which enables automatic operations of system monitoring, alert, auto scaling. ServerTemplates of RightScale [] is an abstract template approach. When a user deploys a template to a Cloud such as Amazon Web Services or RackSpace Cloud Servers, RightScale sets a configuration adapting to each component of deployed Cloud. This concept is similar to our template extraction to enable easy Cloud migration or replication. However, RightScale ServerTemplates transaction managements or reflections of environment change depend on each Cloud and remain unresolved. Our work resolves them by the TM server. Amazon OpsWorks [] is also a technology for cloud service management such as automatic scaling, scheduling, monitoring and deployment. Amazon recommends using OpsWorks in high layer management and using CloudFormation for low layer deployment. Support range of OpsWorks is limited in application oriented Amazon Web Services resources and support range of CloudFormation is much larger. Our work scope is low layer deployment and we will use current management technologies such as RightScale for high layer management.
The paper [] is a research of dynamic resource allocation on OpenStack. As same as [], our work is also a resource deployment technology on OpenStack but our work targets to resolve problems of plural resources deployment like stack operation transactions. There are some works of resource arrangement on hosting services to use physical server resources effectively []. We have already developed a scheduler which determines an appropriate physical server for virtual resource deployment []. Because a stack has many virtual resources and need effective allocations to enhance total system performances, we will combine [] and this work in the future.
In this paper, we proposed the template management technology for end users or System Integrators to build virtual resources environments on OpenStack. To resolve existing technologies problems, we designed the TM server which had a mechanism of roll back/roll forward in case of abnormal failure of stack operations, shared templates among end users and System Integrators, extracted templates from existing environments and reflected actual environment change to stack information. We implemented the proposed TM server on OpenStack Folsom, confirmed functions feasibilities and measured performances.
It was confirmed that the TM server prevented a half-finished stack because it rolled back all operations in case of abnormal failure of stack create and rolled back or rolled forward each operation in case of abnormal failure of stack update. Template sharing to end users who have contracts to System Integrators or providers can replicate virtual resource environments on new tenants easily. Our server extracted a template from non-stack environment except for shared resources. Users could update stack as expected because our server reflected actual environment change such as VM shut down or other OpenStack API operations to stack information. Moreover, we showed the effective performance of template management. Template extraction took 1–3 sec, stack create took 300 sec and stack update took 210 sec through experiments of sample templates with 10 virtual resources.
In the future, we will modify the TM server for OpenStack new versions. IceHouse or Juno is a new major version of OpenStack and provides new functions to catch up Amazon Web Services. We will also propose our technologies of transaction managements and reflections of actual environment change to stack information to community Heat. Furthermore, we will improve the software quality of the TM server and verify the feasibility of existing OSS / BSS interconnections to provide production carrier IaaS services based on OpenStack.
Yoji Yamato received his B. S., M. S. degrees in physics and Ph.D. degrees in general systems studies from University of Tokyo, Japan in 2000, 2002 and 2009, respectively. He joined NTT Corporation, Japan in 2002. Currently he is a RESEARCHER of NTT Software Innovation Center. There, he has been engaged in developmental research of Cloud computing platform, Peer-to-Peer computing, Service Delivery Platform. Dr. Yamato is a member of IEICE, Japan.
Masahito Muroi is a RESEARCHER of NTT Software Innovation Center, NTT Corporation.
Kentaro Tanaka is a RESEARCHER of NTT Software Innovation Center, NTT Corporation.
Mitsutomo Uchimura received his Bachelor's degree in Mechanical Engineering from University of Tokyo, Japan in 1997. He joined NTT Corporation, Japan in 1997. Currently he is a senior research engineer of NTT Software Innovation Center. There, he has been engaged in Cloud SE Project.
We thank Hiroshi Sakai and Hikaru Suzuki who are managers of this development.
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