![]() Once saved the virtual machine will no longer be running.Ī saved virtual machine can be restored using: virsh restore save-my.state The following will save the virtual machine state into a file named according to the date: virsh save save-my.state The state of virtual machines can be saved to a file in order to be restored later. Reboot a virtual machine with: virsh reboot Similarly, to start a virtual machine at boot: virsh autostart To list running virtual machines: virsh list The virsh utility can be used from the command line. ![]() There are several utilities available to manage virtual machines and libvirt. But there are various options at different levels of complexities and feature-sets, like: The following section covers the command-line tools around virsh that are part of libvirt itself. See Virtual Machine Manager / Viewer for more information. Instead of installing a GUI the virt-viewer or virt-manager application can be used to connect to a virtual machine’s console using VNC. In the case of virtual machines, a Graphical User Interface (GUI) is analogous to using a physical keyboard and mouse on a real computer. To use cloud images which are meant to self-initialise (see Multipass and UVTool).A keyboard and monitor attached to the physical machine. ![]() Installing a virtual machine follows the same process as installing the operating system directly on the hardware. You are now ready to install a Guest operating system. If the chosen user is the current user, you will need to log out and back in for the new group membership to take effect. In a terminal enter: sudo adduser $USER libvirt Doing so will grant the user access to the advanced networking options. This is done automatically for members of the sudo group, but needs to be done in addition for anyone else that should access system-wide libvirt resources. Sudo apt install qemu-kvm libvirt-daemon-systemĪfter installing libvirt-daemon-system, the user that will be used to manage virtual machines needs to be added to the libvirt group. ![]() To install the necessary packages, from a terminal prompt enter: sudo apt update There is a great example of how to configure a bridge and combine it with libvirt so that guests will use it at the netplan.io. This allows the virtual interfaces to connect to the outside network through the physical interface, making them appear as normal hosts to the rest of the network. To enable external hosts to directly access services on virtual machines a different type of bridge than the default needs to be configured. Traffic is NATed through the host interface to the outside network. The default virtual network configuration includes bridging and iptables rules implementing usermode networking, which uses the SLiRP protocol. There are a few different ways to allow a virtual machine access to the external network. On many computers with processors supporting hardware-assisted virtualisation, it is necessary to first activate an option in the BIOS to enable it. Enter the following from a terminal prompt: kvm-okĪ message will be printed informing you if your CPU does or does not support hardware virtualisation. Before getting started with libvirt it is best to make sure your hardware supports the necessary virtualisation extensions for KVM. The libvirt library is used to interface with different virtualisation technologies. Multi-node configuration with Docker-Composeĭistributed Replicated Block Device (DRBD)
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