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Figure 1: In Linux Mint, the call to visudo only protects the sudoers file against further access and then calls nano.

Assigning Privileges with sudo and PolicyKit

If you give users who are usually supervised more scope to help themselves, they will need additional privileges. The sudo tool and the PolicyKit authorization service can control who does what on Linux.

Figure 1: Although oVirt 3.1 is available as an update, you still need to remove oVirt 3.0 manually if you have it installed.

Managing Virtual Infrastructures

Version 3.1 of the oVirt management platform for virtual infrastructures has recently become available. On Fedora 17, the new release is easy to install and deploy.

Figure 1: The Windows 8 Disk Management Console.

Linux with Windows 8

Microsoft is not known for its tireless commitment to Linux interoperability, but you can still get Windows to work with Linux – if you have the tools and know the tricks.

Figure 1: The disk storage format is wrongly preset for QCOW2 images.

Building Virtual Images with BoxGrinder and VMBuilder

Creating a virtual machine manually is straightforward but too time consuming if you regularly need to set up many virtual machines. The BoxGrinder and VMBuilder programs let you automate this process.

Figure 1: A schematic representation of the service dependencies in a mail cluster.

Understanding Autodiscovery

A lack of information about your infrastructure can result in faulty system configuration and other difficulties. Automatic discovery of all hosts and services would seem to be the best solution – but can it also prove itself in practice?

Figure 1: In the Server Manager, Windows Server 2012 organizes domain controllers in a group of their own.

Refurbished: Windows 2012 Active Directory

Microsoft’s Windows Server 2012 offers numerous improvements in Active Directory, as well as better and easier management.

Figure 1: The Group Policy Editor with Windows Store Enabled.

Putting Windows 8 on a USB Drive

You don’t have to buy Windows 8 Enterprise Edition to create a Windows To Go USB drive, nor do you have to buy an expensive, certified USB disk to make it work.

Network Grep

Ngrep is a pattern-matching tool that sorts the wheat from the chaff and doubles as a lightweight packet sniffer.

Figure 1: Dependencies for kdump/kexec must be met both on the kernel side and in userland.

Analyzing Kernel Crash Dumps

If the Linux server crashes, not only do you need to restore operations, you also need to analyze the problem. A kernel crash dump at the time of the crash can be a big help.

Figure 1: Activating replication on a Hyper-V host.

Hyper-V 3.0 in Windows Server 2012

In the old Hyper-V hypervisor from Microsoft, many features for professional use were missing. The new version 3.0 has been significantly improved and is slowly catching up to VMware.

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