![]() The action is taken immediately and is effective (on the next host reboot), no need for an explicit submit. A kind of ‘cold-standby’, maybe the only possibility in case of tight CPU and RAM resources on a machine. An example would be a (inactive) backup VM that can take over when problems with the main VM arise. More interesting is the option to quickly enable and disable auto-start on host reboot . These things can become useful when it comes to diagnosing issues. the hypervisor details, or you will hardly ever want to change them, e.g. Some of the parameters displayed are mostly informative, e.g. In the top half it shows the basic runtime parameter along with a terminal window into the virtual machine. If you selecte a virtual machine’s name, a details page opens. Manage a virtual machines basic host runtime environment Later we will use this feature to create special virtual disks. The pool images, on the other hand, contains the disk images of the currently installed virtual machines. ![]() By convention, the distribution files used to create virtual machines are stored in boot. At the top left of the central content area is a box that shows the existence of 2 storage pools on the left and indicates 2 of them as active (up) and no pool inactive (down) on the right. Libvirt structures the virtual machine files into storage pools. It even offers a (simple) migration to another machine. Additional commonly needed functions are offered in a drop-down menu (three vertical dots) to the right of it. The most frequently executed action, shutdown or launch, is directly accessible as a button. In the example above, there are 3 virtual machines, 2 of them running. The V irtual Machines overview page lists, in the central area, all virtual machines installed along with their current state. In Cockpit, select Applications and install the component Machines. If there is no tab Virtual Machines, the corresponding Cockpit module, “cockpit-machines”, is not installed yet. Select Virtual Machines in the left navigation column. Log in either as root or with your administrative account. In your local browser, open Cockpit on the host system using port 9090, e.g. This is the significant distinction from virt-manager, which can be installed on Linux desktops and provides a graphical interface via ssh. The administrator only needs a web browser and thus does not need any special installation on the desktop. This information is always present, so there is no need to keep this information in mind. Server administrators especially benefit from this tool, since Fedora servers do not include a graphical user interface out of the box. ![]() It automatically provides a lot of status information about configuration and resource usage, which you would otherwise have to collect manually. But even those who ‘speak virsh‘ fluently can benefit from Cockpit. It saves long typing on the keyboard including the correction of accidental typos. Cockpit saves the memorization of the complex parameter zoo of e.g. In the same way Cockpit is also extremely useful to manage a virtual machine after creation. ![]() The authors showed to what extent Cockpit simplifies and facilitates this task. Why CockpitĬockpit is not only a tool to create a virtual machine as Karlis Kavacis and Paul W. Cockpit greatly simplifies and facilitates this work, especially for the Fedora Server editions, that themselves do not include a graphical interface. All too often, these assumptions need to be adjusted based on actual use practices, and additional configuration work by system administrator is required. A virtual machine is created under certain assumptions about required memory, data storage, processing capacity, and so on.
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