Abstract:

The emerge of cloud computing pushes Web services onto a broader platform. On the cloud computing platform, dynamic allocation of virtual resources makes the running environment of web service more varied. When it is overloaded, the services will become invalid due to lack of resources, even bringing system collapse. From the perspective of users and system security, resource status turns into the primary factor that should be considered in the selection process, which makes it lose effectiveness to choose a safe and appropriate service if only QoS is considered. To solve this problem, both QoS and the virtual machine resource status are taken into account. According to the information about CPU usage and memory usage of virtual resource, the proposed service selection algorithm is used to select service. Experimental results show that, the service selection algorithm which takes the state of the resource information into account, can obtain the best service under the corresponding state, and answer customers’ requests more quickly.

Key words: cloud computing;resource monitoring;safe service;appropriate service;resource status