Skips the OS installation process and builds a guest around an existing disk image. The device used for booting is the first device specified by the disk or filesystem option. The post-install VM boot configuration. This option allows specifying a boot device order, permanently booting off kernel and initrd with optional kernel arguments and enabling a BIOS boot menu.
To see a complete list of attributes for an option, enter the following command:. The virt-install man page also documents each command option, important variables, and examples. Prior to running virt-install , you may also need to use qemu-img to configure storage options.
For instructions on using qemu-img , see Chapter 14, Using qemu-img. Installing a virtual machine from an ISO image. Importing a virtual machine image.
Installing a virtual machine from the network. Installing a virtual machine using PXE. When installing a virtual machine using the PXE boot protocol, both the --network option specifying a bridged network and the --pxe option must be specified. Installing a virtual machine with Kickstart. TIMER here might be rtc, pit, etc. VAL might be catchup, delay, etc. Refer to the libvirt docs for all values. The URLs take the same format as described for the "--location" argument.
If a cdrom has been specified via the "--disk" option, and neither "--cdrom" nor any other install option is specified, the "--disk" cdrom is used as the install media. With libvirt 0. This option requires the URL to be accessible by both the local and remote host.
This requires running virt-install as root. Note that the directory will not be accessible by the guest after initial boot, so the OS installer will need another way to access the rest of the install media. The device used for booting is the first device specified via "--disk" or "--filesystem".
It may be desirable to also use the "--disk none" flag in combination. By default, virt-install will attempt to auto detect this value from the install media currently only supported for URL installs. Autodetection can be disabled with the special value 'none'. Autodetection can be forced with the special value 'auto'. Use the command "osinfo-query os" to get the list of the accepted OS variants. In the latter case, behavior is similar to the --import install option: there is no 'install' phase, the guest is just created and launched as specified.
Additionally enable BIOS boot menu prompt. In order for virt-install to know the correct UEFI parameters, libvirt needs to be advertising known UEFI binaries via domcapabilities XML, so this will likely only work if using properly configured distro packages.
Existing media can be a file or block device. Specifying a non-existent path implies attempting to create the new storage, and will require specifying a 'size' value. Even for remote hosts, virt-install will try to use libvirt storage APIs to automatically create the given path. For network paths, they hypervisor will directly access the storage, nothing is downloaded locally.
Requires specifying a 'size' value. Other available options: device Disk device type. Value can be 'cdrom', 'disk', 'lun' or 'floppy'. Default is 'disk'. If a 'cdrom' is specified, and no install method is chosen, the cdrom is used as the install media. Devices with lower value has higher priority. Value can be 'ide', 'sata', 'scsi', 'usb', 'virtio' or 'xen'.
The default is hypervisor dependent since not all hypervisors support all bus types. Value can be 'on' or 'off'. Value is 'yes' or 'no'. Default is 'yes' do not fully allocate unless it isn't supported by the underlying storage type. The host pagecache provides cache memory. The cache value can be 'none', 'writethrough', 'directsync', 'unsafe' or 'writeback'.
The value can be either "unmap" allow the discard request to be passed or "ignore" ignore the discard request. Since 1. For file volumes, this can be 'raw', 'qcow2', 'vmdk', etc. If not specified when creating file images, this will default to 'qcow2'. If creating storage, this will be the format of the new image. If using an existing image, this overrides libvirt's format auto-detection.
Typically does not need to be set by the user. Can be either "threads" or "native". Can be one of "stop", "ignore", or "enospace" serial Serial number of the emulated disk device. See the examples section for some uses. For QEMU, the target point is just a mounting hint in sysfs, so will not be automatically mounted.
The following explicit options can be specified: type The type or the source directory. Valid values are 'mount' the default or 'template' for OpenVZ templates. Valid modes are 'passthrough' the default , 'mapped', or 'squash'.
See libvirt domain XML documentation for more info. Also use this if live migration will be used with this guest. Virtual networks can be listed, created, deleted using the "virsh" command line tool. In an unmodified install of "libvirt" there is usually a virtual network with a name of "default".
Use a virtual network if the host has dynamic networking eg NetworkManager , or using wireless. Only use this if running a QEMU guest as an unprivileged user. This provides a very limited form of NAT.
If this option is omitted a single NIC will be created in the guest. We can create an empty, 8 GB raw disk image with the following command:. The KVM hypervisor supports qcow2. There was a performance overhead but nowdays that is almost negligent.
To create an 8 GB qcow2 image:. The virsh-install command is an easy way to spin up a VM from the command line. It allows you to start up an installation from a remote repo network install , from a pxe boot or from a local iso. It also allows you to just boot a vm from a live cd iso. Here are some copy pastable virt-install commands to get you up and running with a few distributions. You do need to have libvirt and KVM running and the disk image should exist.
If your default bridge interface is not named br0 , change that. If you want more, change the command line accordingly. This is used instead of --location. A VNC console is available on localhost, port for you to use. You can get a list of supported operating system variants with the osinfo-query os command. Below you'll find an example output:.
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