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Policy Refinement Using Automatic Composition of Management Web Services in a Policy-Based Autonomic Communications Environment

Policy Refinement Using Automatic Composition of Management Web Services in a Policy-Based Autonomic Communications Environment

          
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About the Book

Das rasante und stetige Wachstum des Internets fuhrt zu einer steigenden Komplexitat der Netzwerk-Administration. Herkommliches Netzwerk-Management, bei dem Administratoren von Hand statische Konfigurationen erstellen und anpassen, ist dieser steigenden Komplexitat nur noch sehr eingeschrankt gewachsen. Ideal ware es, wenn sich die Netze analog zum vegetativen Nervensystem des Menschen verhielten und eine ganze Reihe von Vitalfunktionen ohne Aktivierung der kognitiven Bereiche des Gehirns funktionierten. Dieses Verhalten wird oft als "Autonomic Communications" bezeichnet, wobei die "kognitiven Bereiche" hier der Arbeitskraft der Administratoren entspricht. Policy-basiertes Management wurde bereits vor 15 Jahren diskutiert. Netzadministratoren sollen dabei das gewunschte Verhalten der Netze mit Hilfe strukturierter Regeln (Policies) definieren. Zwar hat Policy-basiertes Management nur zum Teil Einzug in aktuelle Netzwerk-Komponenten gehalten, die bisherigen Forschungsergebnisse machen es jedoch zu einem geeigneten Baustein von Autonomic Communications. Um Automatisierung voranzubringen, muss es Administratoren moglich sein, das gewunschte Verhalten des Netzes lediglich mit Hilfe von Policies auf einer hohen Abstraktionsebene vorzugeben. Diese abstrakten Policies, die meist unabhangig von technischen Details sind, mussen dann auf konkretere, technische Policies heruntergebrochen werden ("Policy Refinement"), nach Moglichkeit automatisiert. In diesem Buch wird ein Policy-basiertes Management-System vorgeschlagen, das als Basis fur eine Autonomic-Communications-Umgebung dienen soll. Der Schwerpunkt liegt dabei auf der Automatisierung des Refinement-Prozesses. Das entwickelte Verfahren verwendet eine Middleware, die auf Web-Services basiert. Samtliche zu administrierende Komponenten bieten Konfigurations- und uberwachungsfunktionalitat als Web-Service an. Diese Web-Services werden dann automatisch zu komplexeren Management-Web-Services zusammengesetzt, je nach Bedarf der im System vorhandenen Policies. Semantische Annotationen der Policies und der Web-Services in Form von OWL-Ontologien werden dazu als technologische Voraussetzung benotigt. So ist es moglich, ausgehend von einer abstrakten Policy die (zusammengesetzten) Web-Services zu finden, die fur die Umsetzung der Policy notwendig sind, ohne dass Interaktion eines Administrators erforderlich ist.


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Product Details
  • ISBN-13: 9783832521400
  • Publisher: Logos Verlag Berlin
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 0 mm
  • Width: 145 mm
  • ISBN-10: 3832521402
  • Publisher Date: 28 Feb 2009
  • Height: 210 mm
  • No of Pages: 304
  • Series Title: English
  • Weight: 700 gr


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