Libvirt: Difference between revisions

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~~{{DISPLAYTITLE~~:~~{{#if:{{NAMESPACE}}|{{NAMESPACE}}:|}}{{lcfirst:{{PAGENAME}}}}}}~~

[https://libvirt.org libvirt] is a toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). It does so by providing a common API to different virtualization backends.

~~{{expansion|Only~~ a ~~superficial look is provided~~.}}

~~libvirt is a toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). It does so by providing a common API to different virtualization backends.~~

== Setup ==

~~Using the {{nixos:option|virtualisation.libvirtd}} options, libvirtd can be enabled on a NixOS machine.~~

Enable libvirt daemon

== ~~Backends~~ ==

{{file|/etc/nixos/configuration.nix|nix|<nowiki>

services.libvirtd = {

enable = true;

qemu = {

package = pkgs.qemu_kvm;

runAsRoot = true;

swtpm.enable = true;

ovmf = {

enable = true;

packages = [(pkgs.unstable.OVMF.override {

secureBoot = true;

tpmSupport = true;

}).fd];

};

</nowiki>}}

~~=== QEMU~~/~~KVM ===~~

To enable local user access to libvirt, for example by using <code>virt-manager</code> or <code>gnome-boxes</code>, add yourself to the <code>libvirtd</code> group

~~This backend works and is enabled by default~~. ~~To use~~ <~~code>virt-manager</code> with your user, locally and via SSH, it will be necessary to add yourself to the <code~~>libvirtd</~~code~~> ~~group.~~

{{file|/etc/nixos/configuration.nix|nix|<nowiki>

users.users.myuser = {

extraGroups = [ "libvirtd" ];

};

</nowiki>}}

== Configuration ==

=== Nested virtualization ===

If you would like to enable nested virtualization for your guests to run KVM hypervisors inside them, you should enable it as follows: {{nixos:option|boot.extraModprobeConfig}}, for example:

<~~syntaxhighlight lang="nix"~~>

{{file|/etc/nixos/configuration.nix|nix|<nowiki>

boot.extraModprobeConfig = "options kvm_intel nested=1";

</~~syntaxhighlight~~>

</nowiki>}}

=== ~~QEMU/KVM User session~~ ===

=== UEFI with OVMF ===

~~====~~ Enable UEFI ~~with OVMF ====~~

Enable UEFI firmware support, following Qemu configuration for your local user is required

~~Add the following line to <code>$XDG_CONFIG_HOME~~/libvirt/qemu.conf<~~/code>:~~

{{file|~/.config/libvirt/qemu.conf|nix|<nowiki>

~~<syntaxhighlight lang=bash~~>

# Adapted from /var/lib/libvirt/qemu.conf

# Note that AAVMF and OVMF are for Aarch64 and x86 respectively

nvram = [ "/run/libvirt/nix-ovmf/AAVMF_CODE.fd:/run/libvirt/nix-ovmf/AAVMF_VARS.fd", "/run/libvirt/nix-ovmf/OVMF_CODE.fd:/run/libvirt/nix-ovmf/OVMF_VARS.fd" ]

</~~syntaxhighlight~~>

</nowiki>}}

See [https://ostechnix.com/enable-uefi-support-for-kvm-virtual-machines-in-linux/ this tutorial] on how to run a guest machine in UEFI mode using <code>virt-manager</code>.

== ~~Tools~~ ==

== Clients ==

NixOS provides some packages that can make use of libvirt or are useful with libvirt.

@@ Line 1: / Line 1: @@
-{{DISPLAYTITLE:{{#if:{{NAMESPACE}}|{{NAMESPACE}}:|}}{{lcfirst:{{PAGENAME}}}}}}
+[https://libvirt.org libvirt] is a toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). It does so by providing a common API to different virtualization backends.
-{{expansion|Only a superficial look is provided.}}
-libvirt is a toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). It does so by providing a common API to different virtualization backends.
+== Setup ==
-Using the {{nixos:option|virtualisation.libvirtd}} options, libvirtd can be enabled on a NixOS machine.
+Enable libvirt daemon
-== Backends ==
+{{file|/etc/nixos/configuration.nix|nix|<nowiki>
+services.libvirtd = {
+  enable = true;
+  qemu = {
+    package = pkgs.qemu_kvm;
+    runAsRoot = true;
+    swtpm.enable = true;
+    ovmf = {
+      enable = true;
+      packages = [(pkgs.unstable.OVMF.override {
+        secureBoot = true;
+        tpmSupport = true;
+      }).fd];
+    };
+  };
+};
+</nowiki>}}
-=== QEMU/KVM ===
+To enable local user access to libvirt, for example by using <code>virt-manager</code> or <code>gnome-boxes</code>, add yourself to the <code>libvirtd</code> group
-This backend works and is enabled by default. To use <code>virt-manager</code> with your user, locally and via SSH, it will be necessary to add yourself to the <code>libvirtd</code> group.
+{{file|/etc/nixos/configuration.nix|nix|<nowiki>
+users.users.myuser = {
+  extraGroups = [ "libvirtd" ];
+};
+</nowiki>}}
+== Configuration ==
+=== Nested virtualization ===
 If you would like to enable nested virtualization for your guests to run KVM hypervisors inside them, you should enable it as follows:  {{nixos:option|boot.extraModprobeConfig}}, for example:
-<syntaxhighlight lang="nix">
+{{file|/etc/nixos/configuration.nix|nix|<nowiki>
 boot.extraModprobeConfig = "options kvm_intel nested=1";
-</syntaxhighlight>
+</nowiki>}}
-=== QEMU/KVM User session ===
+=== UEFI with OVMF ===
-==== Enable UEFI with OVMF ====
+Enable UEFI firmware support, following Qemu configuration for your local user is required
-Add the following line to <code>$XDG_CONFIG_HOME/libvirt/qemu.conf</code>:
+{{file|~/.config/libvirt/qemu.conf|nix|<nowiki>
-<syntaxhighlight lang=bash>
 # Adapted from /var/lib/libvirt/qemu.conf
 # Note that AAVMF and OVMF are for Aarch64 and x86 respectively
 nvram = [ "/run/libvirt/nix-ovmf/AAVMF_CODE.fd:/run/libvirt/nix-ovmf/AAVMF_VARS.fd", "/run/libvirt/nix-ovmf/OVMF_CODE.fd:/run/libvirt/nix-ovmf/OVMF_VARS.fd" ]
-</syntaxhighlight>
+</nowiki>}}
+See [https://ostechnix.com/enable-uefi-support-for-kvm-virtual-machines-in-linux/ this tutorial] on how to run a guest machine in UEFI mode using <code>virt-manager</code>.
-== Tools ==
+== Clients ==
 NixOS provides some packages that can make use of libvirt or are useful with libvirt.