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Integrated Lifecycle of IT Services in a Cloud Environment Karuna P Joshi Ebiquity Research Group, Computer Science and Electrical Engineering Dept, UMBC.

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Presentation on theme: "Integrated Lifecycle of IT Services in a Cloud Environment Karuna P Joshi Ebiquity Research Group, Computer Science and Electrical Engineering Dept, UMBC."— Presentation transcript:

1 Integrated Lifecycle of IT Services in a Cloud Environment Karuna P Joshi Ebiquity Research Group, Computer Science and Electrical Engineering Dept, UMBC

2 Introduction: Software Delivery Models In-house approach: Traditionally, software applications development and maintenance has been done within the company with its own employees. Outsourced or Off shored approach: Software applications purchased by companies. Development and maintenance is contracted to consulting/staffing companies who could be based anywhere in the world. Services on the Cloud approach: IT services purchased from software manufacturers who could be a single entity or a mix. Also termed virtualized software to imply the software development and maintenance is transparent to the consumer.

3 IT Services Information Technology (IT) increasingly being viewed as a Service offered to an organization Software, Customizations, Support, Hosting and Maintenance purchased as a Service from providers. The X as a Service alphabet soup Infrastructure as a Service (IaaS) Platform as a Service (PaaS) Database as a Service (DaaS) Software as a Service (SaaS) etc… Services are virtualized -- shared across multiple provisioning.

4 Virtualized IT Services on the Cloud Composed of one or more components developed by one or more providers and delivered as a single service to the consumer. Service dynamically composed Service structure/components not pre-determined Based on consumers requirements. (On demand composition) Delivered virtually via the Cloud / grid. Consumer specifies both functional and non functional requirements like quality, security, compliance etc.

5 Key Open Issues Composition and orchestration of services currently requires a programmer with knowledge of WSDL (Web Services Definition Language) or similar languages to describe the services. BPEL (Business Process Execution Language) to specify the interactions between the services. Users who are not tech-savvy cannot use this. Currently there is no negotiation capability for service composition in cloud environment Cannot define variable constraints or negotiate on cost, SLAs etc. No automation of the current approach to discover services like RFPs, etc.

6 Our Approach We propose a policy-based approach to automate the service lifecycle on the Cloud. Use Semantic web languages/technologies like OWL (Web Ontology Language), RDF (Resource Description Framework) and associated reasoning infrastructure such as AIR, Jess, etc. Extend the Service Oriented Architecture (SOA) to factor in expressive policies, negotiation and rules-based reasoning to make it more suitable for Cloud Environment.

7 Enterprise Policies Business Processes Budgetary rules HR policies Infrastructure / Facilities Security Compliance etc. Enterprise Policies Business Processes Budgetary rules HR policies Infrastructure / Facilities Security Compliance etc. Service Policies Service Cost Service Agreements Service Obligations Security Compliance, Taxes etc. Service Policies Service Cost Service Agreements Service Obligations Security Compliance, Taxes etc. Service Negotiation Request for Service Constraints Service Negotiation Request for Service Constraints Provider Service Environment Service components Dependent Services Service Agents Development platform Staging platform Provider Service Environment Service components Dependent Services Service Agents Development platform Staging platform Enterprise IT Service Environment Services Packaged applications User devices (e.g. PCs, Laptops, PDAs etc.) Servers Network Infrastructure Enterprise IT Service Environment Services Packaged applications User devices (e.g. PCs, Laptops, PDAs etc.) Servers Network Infrastructure Policy for Services on the Cloud Policies SERVICE CLOUD Service Presentation SaaS DaaS PaaS IaaS Service Presentation SaaS DaaS PaaS IaaS Request For service service PROVIDER CONSUMER Service Level Agreement

8 Methodology for Service Lifecycle Our proposed methodology divides Service Lifecycle into Five Phases Requirements Discovery Negotiation Composition Consumption This Methodology is applicable on private or public cloud. Have proposed metrics to track success of each phase. Have developed initial version of ontologies for the five phases.

9 Phases of IT Services Lifecycle Service Requirements Service Discovery Service Negotiation Service Composition Service Consumption SERVICE CLOUD CONSUMER Service delivered Contract signed Provider(s) identified Service specified New Service needed

10 Services Requirements phase Policy Manager Policy Type Hard constraints Soft constraints Dependents Parents Policy Manager Policy Type Hard constraints Soft constraints Dependents Parents Services Manager Name Provider Type Attributes Location Dependencies Services Manager Name Provider Type Attributes Location Dependencies consumer service Services Procurer Service specs Policies with constraints RFS generator Services Procurer Service specs Policies with constraints RFS generator Service Cloud Provider 1 Request for Service Monitor Service Requirements Request for Service Monitor Service Requirements Request for Service Monitor Service Requirements Request for Service Monitor Service Requirements Provider 2 policy Request for Service Monitor Service Requirements Request for Service Monitor Service Requirements Provider 4 policy specs Request for Service Monitor Service Requirements Request for Service Monitor Service Requirements Issue Request for Service (RFS) Provider 3 Consumer

11 Service Requirements Requirements for a service will include Functional specifications (tasks to be automated) Technical specifications Software applications and constraints Hardware Policy – Mobile device, PC, Server, Multicore etc. Operating System Policy – single OS, multiple OS Language Support Policy Human Agent specifications Agent experience Agent skill level Geographical location constraints Nationality/Work permit constraints

12 Service Requirements (contd…) Requirements for a service will include Security Policy Role Permissions Data Quality Policy Low quality data may be acceptable to consumer if it provides cost saving Service Compliance Policy Standards adhered Certifications needed Government regulations adhered.

13 Example of Requirements Policy Data Quality policy - // allows services of low data quality to be accepted if the service is free of cost. // Using AIR Policy :SERVICE_QUALITY, :COST. :data_quality_policy a air:Policy; rdfs:label "Data Quality policy"; air:rule :data-quality-rule. :data-quality-rule a air:Belief-rule; rdfs:label "data quality rule"; air:pattern { :SERVICE_QUALITY quality_level :LOW. :COST service_cost :0. }; air:assert {:SERVICE_QUALITY air:compliant-with :data_quality_policy.}; air:alt { air:assert {:SERVICE_QUALITY air:NOTcompliant- with :data_quality_policy.}}.

14 Class : Request for Service Service Domain Exp_Svc_Begin_Date Exp_Svc_End_Date RFS_Respond_by_dt Cost_constraint Class: Specification Name Description Class: Security policy Class Technical Specs Class : Functional Specs Task Description High Level Ontology for Service Requirement Phase Class: Hardware Details Class: Operating System Details Class: Compatible Application Details Class: Domain Domain Characteristics Class: Human Agent Specs Experience Availability Nationality Other Constraints Class: Data Quality policy is part of Must include Class: Consumer Consumer-ID Description is sues is part of Is part of is part of Is part of is part of Class: Service Compliance is part of

15 Service Discovery Services search/discovery engine Used to search available services that match the specifications Identify functional gaps that exist in services discovered Service Certification A central registry, like UDDI, will certify a service provided. Consumers can refer to this certification when selecting a service.

16 Service Discovery phase Service Requirements Service Requirements Service Discovery Engine List of service providers with advertised service, service levels and cost Service Verification / Certification SERVICE CLOUD CONSUMER Service Negotiation Service Negotiation

17 Policy in Service Discovery phase Policy Manager Policy Type Hard constraints Soft constraints Dependents Parents Policy Manager Policy Type Hard constraints Soft constraints Dependents Parents Services Manager Name Provider Type Attributes Location Dependencies Services Manager Name Provider Type Attributes Location Dependencies consumer service Services Procurer Service Policies Generate RFS RFS negotiation Services Procurer Service Policies Generate RFS RFS negotiation Service Cloud Provider 1 Cannot provide service RFS Responder Cost Availability Functionality Requirements met RFS Responder Cost Availability Functionality Requirements met Provider 2 policy RFS Responder Cost Availability RFS Responder Cost Availability Provider 4 policy specs Service available Provider 3 Service Provider Validation Service Provider Validation Service Provider Validation Service Provider Validation Service Composer Components Constraints Functionality Requirements met Service Composer Components Constraints Functionality Requirements met Functionality, Requirements met + RFS Responder Availability RFS Responder Availability Consumer

18 Class: Service Certification Provider Service Name Service ranking Class: Service Search Engine Class : Provider List Provider Service details Service availability Service Cost High Level Ontology for Service Discovery Phase used in Verifies Provider Class : Request for Service Service Domain Exp_Svc_Begin_Date Exp_Svc_End_Date RFS_Respond_by_dt Cost_constraint creates Class: Consumer Consumer-ID Description returns list to Class: Provider Service list Description adds to

19 Service Negotiation Discussion and agreement that the Service provider and consumer have regarding the Service. Service Level Agreements (SLA) finalized between consumer and provider Quality of Service (QoS) decided between primary provider and component providers.

20 Service Negotiation phase Service Discovery Service Discovery Service Quality of Service (QoS) between primary service providers and dependent services Service Level Agreement (SLA) between consumer and primary service provider SERVICE CLOUD CONSUMER Service Composition, Orchestration

21 Policy in Service Negotiation phase Policy Manager Policy Type Hard constraints Soft constraints Dependents Parents Policy Manager Policy Type Hard constraints Soft constraints Dependents Parents Services Manager Name Provider Type Attributes Location Dependencies Services Manager Name Provider Type Attributes Location Dependencies consume r service Services Procurer Service Policies Generate RFS RFS negotiation Services Procurer Service Policies Generate RFS RFS negotiation Service Cloud Provider 1 Service Negotiator Cost Availability Service functionality Requirements met Service Negotiator Cost Availability Service functionality Requirements met policy Service Negotiator Cost Availability Service functionality Requirements met Service Negotiator Cost Availability Service functionality Requirements met Provider 4 policy specs Provider 3 Final cost, SLA, configuration Revised soft constraints, SLA Revised cost, configuration Iterative process Revised soft constraints, SLA Revised cost, configuration Iterative process Policy Manager Policy Type Hard constraints Soft constraints Dependents Parents Policy Manager Policy Type Hard constraints Soft constraints Dependents Parents Policy Manager Policy Type Hard constraints Soft constraints Dependents Parents Policy Manager Policy Type Hard constraints Soft constraints Dependents Parents policy ConsumerProvider policy

22 Class: Contract Class: Service Level Agreement SLA Name Description SLA Metrics Penalty Class: Contract Negotiation Class : Quality of Service (QOS) QOS Name Description QOS Metrics Penalty High Level Ontology for Service Negotiation Phase results in Class : Dependent Service Sub- Contract Class : Service Contract subClass of Class: Provider Negotiation Class: Consumer Negotiation subClass of results in is part of Class : Provider List Provider Service details Service availability Service Cost used in Class : Request for Service Service Domain Exp_Svc_Begin_Date Exp_Svc_End_Date RFS_Respond_by_dt Cost_constraint used in Class: Consumer Consumer-ID Description initiates Class: Provider Service list Description initiates participates is part of

23 Service Composition Phase One or more services provided by one or more providers are combined and delivered as a single Service. Service orchestration determines the sequence of execution of the Service components. Service Coupling measure determines how dependent main service is on other services or resources for its delivery Service Cohesion measures the extent to which related aspects of a requirement are kept together in the same service, and unrelated aspects are kept out.

24 Service Composition phase Service Negotiation Service Negotiation Service composed Dependant services SERVICE CLOUD CONSUMER Service Consumption Service Consumption

25 Class : OWL-S – Composite Process High Level Ontology for Service Composition Phase Is part of Defines metrics for Class: Service Level Agreement SLA Name Description SLA Metrics Penalty Class : Quality of Service (QOS) QOS Name Description QOS Metrics Penalty Class: Dependent Service Class: Specification Name Description Determines Class: Provider Service list Description Executes

26 Service Consumption Phase Composed Service is consumed and monitored in this phase. Key measures like Service Performance and reliability are monitored using automated tools. Phase includes Service Delivery, Service payment. Customer Satisfaction is tracked in this phase.

27 Service Consumption phase Service Composition Service Composition Service consumed SERVICE CLOUD CONSUMER Service Requirements Service Requirements Service Monitored Service delivered – one time or periodically as needed Service payment

28 Class : Service Level Agreement Task Description High Level Ontology for Service Consumption Phase Class: Dependent Components Class : OWL-S – Composite Process Class: Provider Service list Description Class: Consumer Consumer-ID Description Class : Service Contract refers toPart of is consumed by Class: Human Component Class : Tier 1 agent Class : Tier 2/ external agent Class : Response Time Class: Assurance Class: Reliability Class: Presentation Class : Performance Class: Resolution Time Class : Software components Class : Latency Class : Throughput Class: Security Policy Provides subClass of subClass of Determine quality for

29 Service Life cycle: detailed Identify functional and technical specifications Determine domain, data type and its acceptable quality levels Request for Service SERVICE CLOUD CONSUMER Service Discovery Engine List of service providers with advertised service, service levels and cost Service Certification Quality of Service (QoS) contracts between primary service providers and dependent services Service Level Agreement (SLA) between consumer and primary service provider Service composed Dependant services Service packaged, delivered – one time or periodically as needed Service payment Service consumed Service Monitoring

30 Ongoing Work Currently developing policies for each phase of the service lifecycle using policy languages like AIR policy language developed by MIT. We continue to refine the IT Service ontology. Ontology in OWL for the entire Lifecycle is available at Developing an integrated quality framework for virtualized services delivered via the cloud.

31 Questions ? Relevant Publications on the Ebiquity website (http://ebiquity.umbc.edu)


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