Virtualisation forms the backbone of cloud computing. Virtual Desktop Infrastructure (VDI) allows an employee’s desktop to be moved into the virtual environment in a central server thus enabling hardware cost reduction and better control over the use of software applications. However, doing so with a software license that has geographical limitations on the type of hardware deployed or does not allow the use of the software in a virtualised setup may result in copyright infringement. In such cases, the license must be re-negotiated at an additional cost for unlimited number of instances or for a specific number of instances in the virtual machine. Additionally the confidentiality provisions of the software license regarding the disclosure of proprietary software must be reviewed to avoid the breach situation.
The setuid permission on an executable file means that the command will run as the user owning the file, not as the user that ran the command. One example is the passwd command: [student@desktopX ~]$ ls -l /usr/bin/passwd -rw s r-xr-x. 1 root root 35504 Jul 16 2010 /usr/bin/passwd In a long listing, you can spot the setuid permissions by a lowercase s where you would normally expect the x (owner execute permissions) to be. If the owner does not have execute permissions, this will be replaced by an uppercase S . The special permission setgid on a directory means that files created in the directory will inherit their group ownership from the directory, rather than inheriting it from the creating user. This is commonly used on group collaborative directories to automatically change a file from the default private group to the shared group, or if files in a directory should be
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