Abstract
Cloud computing is an important technology for businesses and individual users to obtain computing resources over the Internet on-demand and flexibly. Although cloud computing has been adopted across diverse applications, the owners of time-and-performance critical applications require cloud service providers’ guarantees about their services, such as availability and response times. Service Level Agreements (SLAs) are a mechanism to communicate and enforce such guarantees typically represented as service level objectives (SLOs), and financial penalties are imposed on SLO violations. Due to delays and inaccuracies caused by manual processing, an automatic method to periodically verify SLA terms in a transparent and trustworthy manner is fundamental to effective SLA monitoring, leading to the acceptance and credibility of such service to the customers of cloud services. This paper presents a blockchain-based distributed infrastructure that leverages fundamental blockchain properties to achieve immutable and trustworthy SLA monitoring within cloud services. The paper carries out an in-depth empirical investigation for the scalability of the proposed system in order to address the challenge of transparently enforcing real-time monitoring of cloud-hosted services leveraging blockchain technology. This will enable all the stakeholders to enforce accurate execution of SLA without any imprecisions and delays by maintaining an immutable ledger publicly across blockchain network. The experimentation takes into consideration several attributes of blockchain which are critical in achieving optimum performance. The paper also investigates key characteristics of these factors and their impact to the behaviour of the system for further scaling it up under various cases for increased service utilization.
Highlights
Cloud computing has emerged as an important technology for businesses and individual users to obtain computing resources over the Internet
Service Level Agreements (SLAs) are a mechanism to communicate and enforce such guarantees typically represented as service level objectives (SLOs), and financial penalties are imposed on SLO violations
This paper presents a blockchain-based distributed infrastructure that leverages fundamental blockchain properties to achieve immutable and trustworthy SLA monitoring within cloud services
Summary
A typical SLA documents a set of service level objectives (SLOs) in terms of different quality of service (QoS) metrics and mentions financial penalties on SLO violations for the cloud provider. Most customers hosting services and solutions on the cloud platforms ensure the QoS for their end-users by relying on the cloud provider guarantees. It is Cluster Computing important for customers to automatically and periodically verify the SLA terms in a transparent and trustworthy method. A Service Level Agreement (SLA) is a contract between a service consumer and a service provider that identifies what services will be provided, the goals that will be met, and penalties if expected QoS metrics are not met by the service provider [9]. There are typically 6 stages in the lifecycle, which are described below: 1. Discover service provider The customer identifies a service provider that provides the required services
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