Fs 1 4 1 – Note Manager Resume

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Libvirt is collection of software that provides a convenient way to manage virtual machines and other virtualization functionality, such as storage and network interface management. These software pieces include a long term stable C API, a daemon (libvirtd), and a command line utility (virsh). A primary goal of libvirt is to provide a single way to manage multiple different virtualization providers/hypervisors, such as the KVM/QEMU, Xen, LXC, OpenVZ or VirtualBoxhypervisors (among others).

Some of the major libvirt features are:

• VM management: Various domain lifecycle operations such as start, stop, pause, save, restore, and migrate. Hotplug operations for many device types including disk and network interfaces, memory, and CPUs.
• Remote machine support: All libvirt functionality is accessible on any machine running the libvirt daemon, including remote machines. A variety of network transports are supported for connecting remotely, with the simplest being SSH, which requires no extra explicit configuration.
• Storage management: Any host running the libvirt daemon can be used to manage various types of storage: create file images of various formats (qcow2, vmdk, raw, ..), mount NFS shares, enumerate existing LVM volume groups, create new LVM volume groups and logical volumes, partition raw disk devices, mount iSCSI shares, and much more.
• Network interface management: Any host running the libvirt daemon can be used to manage physical and logical network interfaces. Enumerate existing interfaces, as well as configure (and create) interfaces, bridges, vlans, and bond devices.
• Virtual NAT and Route based networking: Any host running the libvirt daemon can manage and create virtual networks. Libvirt virtual networks use firewall rules to act as a router, providing VMs transparent access to the host machines network.

Installation

Because of its daemon/client architecture, libvirt needs only be installed on the machine which will host the virtualized system. Note that the server and client can be the same physical machine.

Server

Install the libvirt package, as well as at least one hypervisor:

• The libvirt KVM/QEMU driver is the primary libvirt driver and if KVM is enabled, fully virtualized, hardware accelerated guests will be available. See the QEMU article for more information.

• Other supported hypervisors include LXC, VirtualBox and Xen. See the respective articles for installation instructions. With respect to libvirtd installation note:
  • The libvirt LXC driver has no dependency on the LXC userspace tools provided by lxc, therefore there is no need to install the package if planning on using the driver.
  • Xen support is available, but not by default (FS#27356). You need to use the ABS to modify libvirt's PKGBUILD and build it without the -Ddriver_libxl=disabled option.

For network connectivity, install:

• iptables-nft, and dnsmasq for the default NAT/DHCP networking.
• bridge-utils for bridged networking.
• openbsd-netcat for remote management over SSH.

Client

The client is the user interface that will be used to manage and access the virtual machines.

• virsh — Command line program for managing and configuring domains.

https://libvirt.org/ || libvirt

• GNOME Boxes — Simple GNOME application to access virtual systems.

https://wiki.gnome.org/Apps/Boxes || gnome-boxes

• Libvirt Sandbox — Application sandbox toolkit.

https://sandbox.libvirt.org/ || libvirt-sandbox^AUR

• Remote Viewer — Simple remote display client.

https://virt-manager.org/ || virt-viewer

• Qt VirtManager — Qt application for managing virtual machines.

https://github.com/F1ash/qt-virt-manager || qt-virt-manager^AUR

• Virtual Machine Manager — Graphically manage KVM, Xen, or LXC via libvirt.

https://virt-manager.org/ || virt-manager

• Cockpit — Web-based system administration tool with plugin to manage virtual machines.

https://cockpit-project.org/ || cockpit-machines

A list of libvirt-compatible software can be found here.

Configuration

For system-level administration (i.e. global settings and image-volume location), libvirt minimally requires setting up authorization, and starting the daemon.

Set up authentication

From libvirt: Connection authentication:

The libvirt daemon allows the administrator to choose the authentication mechanisms used for client connections on each network socket independently. This is primarily controlled via the libvirt daemon master config file in /etc/libvirt/libvirtd.conf. Each of the libvirt sockets can have its authentication mechanism configured independently. There is currently a choice of none, polkit and sasl.

Using libvirt group

The easiest way to ensure your user has access to libvirt daemon is to add member to libvirtuser group.

Members of the libvirt group have passwordless access to the RW daemon socket by default.

Using polkit

Because libvirt pulls polkit as a dependency during installation, polkit is used as the default value for the unix_sock_auth parameter (source). File-based permissions remain nevertheless available.

The libvirt daemon provides two polkit actions in /usr/share/polkit-1/actions/org.libvirt.unix.policy:

• org.libvirt.unix.manage for full management access (RW daemon socket), and
• org.libvirt.unix.monitor for monitoring only access (read-only socket).

The default policy for the RW daemon socket will require to authenticate as an admin. This is akin to sudo auth, but does not require that the client application ultimately run as root. Default policy will still allow any application to connect to the RO socket.

Arch defaults to consider anybody in the wheel group as an administrator: this is defined in /usr/share/polkit-1/rules.d/50-default.rules (see Polkit#Administrator identities). Therefore there is no need to create a new group and rule file if your user is a member of the wheel group: upon connection to the RW socket (e.g. via virt-manager) you will be prompted for your user's password.

You may change the group authorized to access the RW daemon socket. As an example, to authorize the mykvm group, create the following file:

Then add yourself to the mykvm group and relogin. Replace mykvm with any group of your preference just make sure it exists and that your user is a member of it (see Users and groups for more information).

Do not forget to relogin for group changes to take effect.

Authenticate with file-based permissions

To define file-based permissions for users in the libvirt group to manage virtual machines, uncomment and define:

While some guides mention changed permissions of certain libvirt directories to ease management, keep in mind permissions are lost on package update. To edit these system directories, root user is expected.

Daemon

Start both libvirtd.service and virtlogd.service. Optionally enablelibvirtd.service (which will also enable virtlogd.socket and virtlockd.socketunits, so there is NO need to also enable virtlogd.service).

Unencrypt TCP/IP sockets

Edit /etc/libvirt/libvirtd.conf:

It is also necessary to start the server in listening mode by editing /etc/conf.d/libvirtd: Filmconvert pro 2 02 ofx download free.

Access virtual machines using their hostnames

For host access to guests on non-isolated, bridged networks, enable the libvirt NSS module provided by libvirt.

Edit /etc/nsswitch.conf:

Test

To test if libvirt is working properly on a system level:

To test if libvirt is working properly for a user-session:

Management

Libvirt management is done mostly with three tools: virt-manager (GUI), virsh, and guestfish (which is part of libguestfs).

virsh

The virsh program is for managing guest domains (virtual machines) and works well for scripting, virtualization administration. Though most virsh commands require root privileges to run due to the communication channels used to talk to the hypervisor, typical management, creation, and running of domains (like that done with VirtualBox) can be done as a regular user.

Virsh includes an interactive terminal that can be entered if no commands are passed (options are allowed though): virsh. The interactive terminal has support for tab completion.

From the command line:

From the interactive terminal:

Help is available:

Storage pools

A pool is a location where storage volumes can be kept. What libvirt defines as volumes others may define as 'virtual disks' or 'virtual machine images'. Pool locations may be a directory, a network filesystem, or partition (this includes a LVM). Pools can be toggled active or inactive and allocated for space.

On the system-level, /var/lib/libvirt/images/ will be activated by default; on a user-session, virt-manager creates $HOME/VirtualMachines.

Print active and inactive storage pools:

Create a new pool using virsh

If one wanted to add a storage pool, here are examples of the command form, adding a directory, and adding a LVM volume:

The above command defines the information for the pool, to build it:

To remove it:

• It is a good practice to dedicate a volume group to the storage pool only.
• Choose a LVM volume group that differs from the pool name, otherwise when the storage pool is deleted the LVM group will be too.

Create a new pool using virt-manager

First, connect to a hypervisor (e.g. QEMU/KVM system, or user-session). Then, right-click on a connection and select Details; select the Storage tab, push the + button on the lower-left, and follow the wizard.

Storage volumes

Once the pool has been created, volumes can be created inside the pool. If building a new domain (virtual machine), this step can be skipped as a volume can be created in the domain creation process.

Create a new volume with virsh

Create volume, list volumes, resize, and delete:

Domains

Virtual machines are called domains. If working from the command line, use virsh to list, create, pause, shutdown domains, etc. virt-viewer can be used to view domains started with virsh. Creation of domains is typically done either graphically with virt-manager or with virt-install (a command line program installed as part of the virt-install package).

Creating a new domain typically involves using some installation media, such as an .iso from the storage pool or an optical drive.

Print active and inactive domains:

Create a new domain using virt-install

The factual accuracy of this article or section is disputed.

For an extremely detailed domain (virtual machine) setup, it is easier to #Create a new domain using virt-manager. However, basics can easily be done with virt-install and still run quite well. Minimum specifications are --name, --memory, guest storage (--disk, --filesystem, or --nodisks), and an install method (generally an .iso or CD). See virt-install(1) for more details and information about unlisted options.

Arch Linux install (two GiB, qcow2 format volume create; user-networking):

Fedora testing (Xen hypervisor, non-default pool, do not originally view):

Windows:

Import existing volume:

Create a new domain using virt-manager

First, connect to the hypervisor (e.g. QEMU/KVM system or user session), right click on a connection and select New, and follow the wizard.

• On the fourth step, de-selecting Allocate entire disk now will make setup quicker and can save disk space in the interum; however, it may cause volume fragmentation over time.
• On the fifth step, open Advanced options and make sure that Virt Type is set to kvm (this is usually the preferred method). If additional hardware setup is required, select the Customize configuration before install option.

Manage a domain

Start a domain:

Gracefully attempt to shutdown a domain; force off a domain:

Autostart domain on libvirtd start:

Shutdown domain on host shutdown:

Running domains can be automatically suspended/shutdown at host shutdown using the libvirt-guests.service systemd service. This same service will resume/startup the suspended/shutdown domain automatically at host startup. Read /etc/conf.d/libvirt-guests for service options.

Edit a domain's XML configuration:

Networks

A decent overview of libvirt networking.

Four network types exist that can be created to connect a domain to:

• bridge — a virtual device; shares data directly with a physical interface. Use this if the host has static networking, it does not need to connect other domains, the domain requires full inbound and outbound trafficking, and the domain is running on a system-level. See Network bridge on how to add a bridge. After creation, it needs to be specified in the respective guest's .xml configuration file.
• network — a virtual network; has ability to share with other domains. Libvirt offers many virtual network modes, such as NAT mode (Network address translation), routed mode and isolated mode. Using a virtual network is particularly indicated if the host has dynamic networking (e.g. NetworkManager), or using wireless.
• macvtap — connect directly to a host physical interface.
• user — local ability networking. Use this only for a user session.

virsh has the ability to create networking with numerous options for most users, however, it is easier to create network connectivity with a graphic user interface (like virt-manager), or to do so on creation with virt-install.

You could get VM ip address via (in case it connected to default network and receives IP address via dhcp):

command (replacing default with network name VM connected to), or if VM has qemu-guest-agent running via:

replacing $vm with actual virtual machine name (or domain id).

IPv6

When adding an IPv6 address through any of the configuration tools, you will likely receive the following error:

Fix this by running the following command (replace eth0 with the name of your physical interface):

Snapshots

Snapshots take the disk, memory, and device state of a domain at a point-of-time, and save it for future use. They have many uses, from saving a 'clean' copy of an OS image to saving a domain's state before a potentially destructive operation. Snapshots are identified with a unique name.

Snapshots are saved within the volume itself and the volume must be the format: qcow2 or raw. Snapshots use deltas in order not to take as much space as a full copy would.

Create a snapshot

This article or section is out of date.

Once a snapshot is taken it is saved as a new block device and the original snapshot is taken offline. Snapshots can be chosen from and also merged into another (even without shutting down the domain).

Print a running domain's volumes (running domains can be printed with virsh list):

To see a volume's physical properties:

Create a disk-only snapshot (the option --atomic will prevent the volume from being modified if snapshot creation fails):

List snapshots:

One can they copy the original image with cp --sparse=true or rsync -S and then merge the the original back into snapshot:

domain.snapshot1 becomes a new volume. After this is done the original volume (domain.img and snapshot metadata can be deleted. The virsh blockcommit would work opposite to blockpull but it seems to be currently under development (including snapshot-revert feature, scheduled to be released sometime next year.

Set up authentication

From libvirt: Connection authentication:

The libvirt daemon allows the administrator to choose the authentication mechanisms used for client connections on each network socket independently. This is primarily controlled via the libvirt daemon master config file in /etc/libvirt/libvirtd.conf. Each of the libvirt sockets can have its authentication mechanism configured independently. There is currently a choice of none, polkit and sasl.

Using libvirt group

The easiest way to ensure your user has access to libvirt daemon is to add member to libvirtuser group.

Members of the libvirt group have passwordless access to the RW daemon socket by default.

Using polkit

Because libvirt pulls polkit as a dependency during installation, polkit is used as the default value for the unix_sock_auth parameter (source). File-based permissions remain nevertheless available.

The libvirt daemon provides two polkit actions in /usr/share/polkit-1/actions/org.libvirt.unix.policy:

• org.libvirt.unix.manage for full management access (RW daemon socket), and
• org.libvirt.unix.monitor for monitoring only access (read-only socket).

The default policy for the RW daemon socket will require to authenticate as an admin. This is akin to sudo auth, but does not require that the client application ultimately run as root. Default policy will still allow any application to connect to the RO socket.

Arch defaults to consider anybody in the wheel group as an administrator: this is defined in /usr/share/polkit-1/rules.d/50-default.rules (see Polkit#Administrator identities). Therefore there is no need to create a new group and rule file if your user is a member of the wheel group: upon connection to the RW socket (e.g. via virt-manager) you will be prompted for your user's password.

You may change the group authorized to access the RW daemon socket. As an example, to authorize the mykvm group, create the following file:

Then add yourself to the mykvm group and relogin. Replace mykvm with any group of your preference just make sure it exists and that your user is a member of it (see Users and groups for more information).

Do not forget to relogin for group changes to take effect.

Authenticate with file-based permissions

To define file-based permissions for users in the libvirt group to manage virtual machines, uncomment and define:

While some guides mention changed permissions of certain libvirt directories to ease management, keep in mind permissions are lost on package update. To edit these system directories, root user is expected.

Daemon

Start both libvirtd.service and virtlogd.service. Optionally enablelibvirtd.service (which will also enable virtlogd.socket and virtlockd.socketunits, so there is NO need to also enable virtlogd.service).

Unencrypt TCP/IP sockets

Edit /etc/libvirt/libvirtd.conf:

It is also necessary to start the server in listening mode by editing /etc/conf.d/libvirtd: Filmconvert pro 2 02 ofx download free.

Access virtual machines using their hostnames

For host access to guests on non-isolated, bridged networks, enable the libvirt NSS module provided by libvirt.

Edit /etc/nsswitch.conf:

Test

To test if libvirt is working properly on a system level:

To test if libvirt is working properly for a user-session:

Management

Libvirt management is done mostly with three tools: virt-manager (GUI), virsh, and guestfish (which is part of libguestfs).

virsh

The virsh program is for managing guest domains (virtual machines) and works well for scripting, virtualization administration. Though most virsh commands require root privileges to run due to the communication channels used to talk to the hypervisor, typical management, creation, and running of domains (like that done with VirtualBox) can be done as a regular user.

Virsh includes an interactive terminal that can be entered if no commands are passed (options are allowed though): virsh. The interactive terminal has support for tab completion.

From the command line:

From the interactive terminal:

Help is available:

Storage pools

A pool is a location where storage volumes can be kept. What libvirt defines as volumes others may define as 'virtual disks' or 'virtual machine images'. Pool locations may be a directory, a network filesystem, or partition (this includes a LVM). Pools can be toggled active or inactive and allocated for space.

On the system-level, /var/lib/libvirt/images/ will be activated by default; on a user-session, virt-manager creates $HOME/VirtualMachines.

Print active and inactive storage pools:

Create a new pool using virsh

If one wanted to add a storage pool, here are examples of the command form, adding a directory, and adding a LVM volume:

The above command defines the information for the pool, to build it:

To remove it:

• It is a good practice to dedicate a volume group to the storage pool only.
• Choose a LVM volume group that differs from the pool name, otherwise when the storage pool is deleted the LVM group will be too.

Create a new pool using virt-manager

First, connect to a hypervisor (e.g. QEMU/KVM system, or user-session). Then, right-click on a connection and select Details; select the Storage tab, push the + button on the lower-left, and follow the wizard.

Storage volumes

Once the pool has been created, volumes can be created inside the pool. If building a new domain (virtual machine), this step can be skipped as a volume can be created in the domain creation process.

Create a new volume with virsh

Create volume, list volumes, resize, and delete:

Domains

Virtual machines are called domains. If working from the command line, use virsh to list, create, pause, shutdown domains, etc. virt-viewer can be used to view domains started with virsh. Creation of domains is typically done either graphically with virt-manager or with virt-install (a command line program installed as part of the virt-install package).

Creating a new domain typically involves using some installation media, such as an .iso from the storage pool or an optical drive.

Print active and inactive domains:

Create a new domain using virt-install

The factual accuracy of this article or section is disputed.

For an extremely detailed domain (virtual machine) setup, it is easier to #Create a new domain using virt-manager. However, basics can easily be done with virt-install and still run quite well. Minimum specifications are --name, --memory, guest storage (--disk, --filesystem, or --nodisks), and an install method (generally an .iso or CD). See virt-install(1) for more details and information about unlisted options.

Arch Linux install (two GiB, qcow2 format volume create; user-networking):

Fedora testing (Xen hypervisor, non-default pool, do not originally view):

Windows:

Import existing volume:

Create a new domain using virt-manager

First, connect to the hypervisor (e.g. QEMU/KVM system or user session), right click on a connection and select New, and follow the wizard.

• On the fourth step, de-selecting Allocate entire disk now will make setup quicker and can save disk space in the interum; however, it may cause volume fragmentation over time.
• On the fifth step, open Advanced options and make sure that Virt Type is set to kvm (this is usually the preferred method). If additional hardware setup is required, select the Customize configuration before install option.

Manage a domain

Start a domain:

Gracefully attempt to shutdown a domain; force off a domain:

Autostart domain on libvirtd start:

Shutdown domain on host shutdown:

Running domains can be automatically suspended/shutdown at host shutdown using the libvirt-guests.service systemd service. This same service will resume/startup the suspended/shutdown domain automatically at host startup. Read /etc/conf.d/libvirt-guests for service options.

Edit a domain's XML configuration:

Networks

A decent overview of libvirt networking.

Four network types exist that can be created to connect a domain to:

• bridge — a virtual device; shares data directly with a physical interface. Use this if the host has static networking, it does not need to connect other domains, the domain requires full inbound and outbound trafficking, and the domain is running on a system-level. See Network bridge on how to add a bridge. After creation, it needs to be specified in the respective guest's .xml configuration file.
• network — a virtual network; has ability to share with other domains. Libvirt offers many virtual network modes, such as NAT mode (Network address translation), routed mode and isolated mode. Using a virtual network is particularly indicated if the host has dynamic networking (e.g. NetworkManager), or using wireless.
• macvtap — connect directly to a host physical interface.
• user — local ability networking. Use this only for a user session.

virsh has the ability to create networking with numerous options for most users, however, it is easier to create network connectivity with a graphic user interface (like virt-manager), or to do so on creation with virt-install.

You could get VM ip address via (in case it connected to default network and receives IP address via dhcp):

command (replacing default with network name VM connected to), or if VM has qemu-guest-agent running via:

replacing $vm with actual virtual machine name (or domain id).

IPv6

When adding an IPv6 address through any of the configuration tools, you will likely receive the following error:

Fix this by running the following command (replace eth0 with the name of your physical interface):

Snapshots

Snapshots take the disk, memory, and device state of a domain at a point-of-time, and save it for future use. They have many uses, from saving a 'clean' copy of an OS image to saving a domain's state before a potentially destructive operation. Snapshots are identified with a unique name.

Snapshots are saved within the volume itself and the volume must be the format: qcow2 or raw. Snapshots use deltas in order not to take as much space as a full copy would.

Create a snapshot

This article or section is out of date.

Once a snapshot is taken it is saved as a new block device and the original snapshot is taken offline. Snapshots can be chosen from and also merged into another (even without shutting down the domain).

Print a running domain's volumes (running domains can be printed with virsh list):

To see a volume's physical properties:

Create a disk-only snapshot (the option --atomic will prevent the volume from being modified if snapshot creation fails):

List snapshots:

One can they copy the original image with cp --sparse=true or rsync -S and then merge the the original back into snapshot:

domain.snapshot1 becomes a new volume. After this is done the original volume (domain.img and snapshot metadata can be deleted. The virsh blockcommit would work opposite to blockpull but it seems to be currently under development (including snapshot-revert feature, scheduled to be released sometime next year.

Other management

Connect to non-default hypervisor:

Connect to the QEMU hypervisor over SSH; and the same with logging:

Connect a graphic console over SSH:

Connect to the VirtualBox hypervisor (VirtualBox support in libvirt is not stable yet and may cause libvirtd to crash):

Network configurations:

Sharing data between host and guest

Virtio-FS

The description here will use hugepages to enable the usage of shared folders. Sharing files with Virtio-FS lists an overview of the supported options to enable filesharing with the guest.

First you need to enable hugepages which are used by the virtual machine:

To determine the number of hugepages needed check the size of the hugepages:

The number of hugepages is memory size of virtual machine / Hugepagesize. Add to this value some additional pages. You have to reboot after this step, so that the hugepages are allocated.

Now you have to prepare the configuration of the virtual machine:

It is necessary to add the NUMA definition so that the memory access can be declared as shared. id and cpus values for NUMA will be inserted by virsh.

It should now be possible to mount the folder in the shared machine:

Add the following fstab entry to mount the folder automatically at boot:

9p

File system directories can be shared using the 9P protocol. Details are available in QEMU's documentation of 9psetup.

Configure the virtual machine as follows:

Fs 1 4 1 – Note Manager Resume Format

Boot the guest and mount the shared directory from it using:

See https://www.kernel.org/doc/html/latest/filesystems/9p.html for more mount options.

To mount it at boot, add it to the guest's fstab:

The module for the 9p transport (i.e. 9pnet_virtio for trans=virtio) will not be automatically loaded, so mounting the file system from /etc/fstab will fail and you will encounter an error like 9pnet: Could not find request transport: virtio. The solution is to preload the module durring boot:

UEFI Support

Libvirt can support UEFI virtual machines through QEMU and OVMF.

Install the edk2-ovmf package.

Restartlibvirtd.

Now you are ready to create a UEFI virtual machine. Create a new virtual machine through virt-manager. When you get to the final page of the 'New VM' wizard, do the following:

• Click 'Customize before install', then select 'Finish'
• On the 'Overview' screen, Change the 'Firmware' field to select the 'UEFI x86_64' option.
• Click 'Begin Installation'
• The boot screen you will see should use linuxefi commands to boot the installer, and you should be able to run efibootmgr inside that system, to verify that you are running an UEFI OS.

See Fedora:Using UEFI with QEMU for more information.

Tips and tricks

Python connectivity code

The libvirt-python package provides a Python API in /usr/lib/python3.x/site-packages/libvirt.py.

General examples are given in /usr/share/doc/libvirt-python-your_libvirt_version/examples/

Unofficial example using qemu and openssh:

Advanced Format 4K native disk

To turn a disk into an Advanced Format 4Kn disk, both its physical and logical sector size needs to be set to 4 KiB. For virtio-blk and virtio-scsi this can be done by setting the logical_block_size and physical_block_size options with the the element. For example:

Troubleshooting

PulseAudio on system instance

The PulseAudio daemon normally runs under your regular user account, and will only accept connections from the same user. This can be a problem if QEMU is being run as root through libvirt. To run QEMU as a regular user, edit /etc/libvirt/qemu.conf and set the user option to your username.

You will also need to tell QEMU to use the PulseAudio backend and identify the server to connect to. Add the following section to your domain configuration using virsh edit.

Fs 1 4 1 – Note Manager Resume Download

1000 is your user id. Change it if necessary.

You can omit the latency settings (in microseconds) but using the defaults might result in crackling.

Hypervisor CPU use

Default VM configuration generated by virt-manager may cause rather high (10-20%) CPU use caused by the QEMU process.If you plan to run the VM in headless mode, consider removing some of the unnecessary devices.

VM can't be unpaused on virt-manager

If you see I/O related errors, maybe the host partition where the virtual disk image is is full. My images are at /var/lib/libvirt/images/ and I reserved only 100 GB to my / partition. Thus I knew it was full and had no space for the VM to grow after running

I had over 30 GB of cached packages, so cleaning it up helped mitigate the issue. Be aware that qcow2 images grow over time, so if it once fit in the partition, after a while this may no longer be true.

Fs 1 4 1 – Note Manager Resume Sample

See also