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In the model architecture, the control manager is the add-on extension of the OpenNebula application programming interface (shown in Figure 2.2) that we already discussed in section 2.3. The cloud user request to the control manager for accessing on-demand VMs for the different physical host, the control manager instance OpenNebula can manage users request regarding cloud storage, networks, and software services.

The authentication gives the user access to VMs within the cloud [37]. All the physical hosts share multiple virtual machines, and these machines monitor by virtual machine monitors (VMM). OpenNebula perform overall management of a cloud system; it helps the network investigator to analyse forensically captured data of vulnerabilities, risk, cyber-threats, and malicious attacks on cloud network environment for further investigations.

Figure 2.2 OpenNebula: a community-based cloud management system that manages resources of the cloud physical host, VMs, VMM, control access, and authentication between cloud users.