289,970 research outputs found
Samba Openldap: An Evolution And Insight
Directory services facilitate access to information
organized under a variety of frameworks and applications. The
Lightweight Directory Access Protocol is a promising technology
that provides access to directory information using a data
structure similar to that of the X.500 protocol. IBM Tivoli,
Novell, Sun, Oracle, Microsoft, and many other vendor features
LDAP-based implementations. The technology’s increasing
popularity is due both to its flexibility and its compatibility with
existing applications. A directory service is a searchable
database repository that lets authorized users and services find
information related to people, computers, network devices, and
applications. Given the increasing need for information —
particularly over the Internet — directory popularity has grown
over the last decade and is now a common choice for distributed
applications. Lightweight Directory Access Protocol (LDAP)
accommodates the need of high level of security, single sign-on,
and centralized user management. This protocol offers security
services and integrated directory with capability of storage
management user information in a directory. Therefore at the
same time the user can determine application, service, server to
be accessed, and user privileges. It is necessary to realize files
sharing between different operating systems in local area
network. Samba software package, as the bridge across Windows
and Linux, can help us resolve the problem. In this paper, we try
to explore previous literature on this topic and also consider
current authors work then come out with our views on the
subject matter of discussion based on our understanding
Service Migration from Cloud to Multi-tier Fog Nodes for Multimedia Dissemination with QoE Support.
A wide range of multimedia services is expected to be offered for mobile users via various wireless access networks. Even the integration of Cloud Computing in such networks does not support an adequate Quality of Experience (QoE) in areas with high demands for multimedia contents. Fog computing has been conceptualized to facilitate the deployment of new services that cloud computing cannot provide, particularly those demanding QoE guarantees. These services are provided using fog nodes located at the network edge, which is capable of virtualizing their functions/applications. Service migration from the cloud to fog nodes can be actuated by request patterns and the timing issues. To the best of our knowledge, existing works on fog computing focus on architecture and fog node deployment issues. In this article, we describe the operational impacts and benefits associated with service migration from the cloud to multi-tier fog computing for video distribution with QoE support. Besides that, we perform the evaluation of such service migration of video services. Finally, we present potential research challenges and trends
Towards delay-aware container-based Service Function Chaining in Fog Computing
Recently, the fifth-generation mobile network (5G) is getting significant attention. Empowered by Network Function Virtualization (NFV), 5G networks aim to support diverse services coming from different business verticals (e.g. Smart Cities, Automotive, etc). To fully leverage on NFV, services must be connected in a specific order forming a Service Function Chain (SFC). SFCs allow mobile operators to benefit from the high flexibility and low operational costs introduced by network softwarization. Additionally, Cloud computing is evolving towards a distributed paradigm called Fog Computing, which aims to provide a distributed cloud infrastructure by placing computational resources close to end-users. However, most SFC research only focuses on Multi-access Edge Computing (MEC) use cases where mobile operators aim to deploy services close to end-users. Bi-directional communication between Edges and Cloud are not considered in MEC, which in contrast is highly important in a Fog environment as in distributed anomaly detection services. Therefore, in this paper, we propose an SFC controller to optimize the placement of service chains in Fog environments, specifically tailored for Smart City use cases. Our approach has been validated on the Kubernetes platform, an open-source orchestrator for the automatic deployment of micro-services. Our SFC controller has been implemented as an extension to the scheduling features available in Kubernetes, enabling the efficient provisioning of container-based SFCs while optimizing resource allocation and reducing the end-to-end (E2E) latency. Results show that the proposed approach can lower the network latency up to 18% for the studied use case while conserving bandwidth when compared to the default scheduling mechanism
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