Although it is quite safe to restart ```libvirtd``` when there are only ```qemu``` machines, in case if there are ```libvirt_lxc``` containers, a restart may result in putting the whole system into an odd state: the containers go on running but the new ```libvirtd``` daemons do not see them.
207 lines
6.1 KiB
Nix
207 lines
6.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.virtualisation.libvirtd;
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vswitch = config.virtualisation.vswitch;
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configFile = pkgs.writeText "libvirtd.conf" ''
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unix_sock_group = "libvirtd"
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unix_sock_rw_perms = "0770"
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auth_unix_ro = "none"
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auth_unix_rw = "none"
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${cfg.extraConfig}
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'';
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qemuConfigFile = pkgs.writeText "qemu.conf" ''
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${optionalString cfg.qemuOvmf ''
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nvram = ["/run/libvirt/nix-ovmf/OVMF_CODE.fd:/run/libvirt/nix-ovmf/OVMF_VARS.fd"]
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''}
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${cfg.qemuVerbatimConfig}
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'';
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in {
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###### interface
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options = {
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virtualisation.libvirtd.enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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This option enables libvirtd, a daemon that manages
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virtual machines. Users in the "libvirtd" group can interact with
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the daemon (e.g. to start or stop VMs) using the
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<command>virsh</command> command line tool, among others.
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'';
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};
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virtualisation.libvirtd.enableKVM = mkOption {
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type = types.bool;
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default = true;
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description = ''
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This option enables support for QEMU/KVM in libvirtd.
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'';
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};
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virtualisation.libvirtd.extraConfig = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Extra contents appended to the libvirtd configuration file,
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libvirtd.conf.
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'';
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};
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virtualisation.libvirtd.qemuVerbatimConfig = mkOption {
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type = types.lines;
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default = ''
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namespaces = []
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'';
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description = ''
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Contents written to the qemu configuration file, qemu.conf.
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Make sure to include a proper namespace configuration when
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supplying custom configuration.
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'';
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};
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virtualisation.libvirtd.qemuOvmf = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Allows libvirtd to take advantage of OVMF when creating new
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QEMU VMs with UEFI boot.
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'';
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};
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virtualisation.libvirtd.extraOptions = mkOption {
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type = types.listOf types.str;
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default = [ ];
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example = [ "--verbose" ];
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description = ''
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Extra command line arguments passed to libvirtd on startup.
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'';
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};
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virtualisation.libvirtd.onShutdown = mkOption {
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type = types.enum ["shutdown" "suspend" ];
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default = "suspend";
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description = ''
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When shutting down / restarting the host what method should
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be used to gracefully halt the guests. Setting to "shutdown"
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will cause an ACPI shutdown of each guest. "suspend" will
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attempt to save the state of the guests ready to restore on boot.
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'';
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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environment.systemPackages = with pkgs; [ libvirt netcat-openbsd ];
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boot.kernelModules = [ "tun" ];
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users.extraGroups.libvirtd.gid = config.ids.gids.libvirtd;
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systemd.packages = [ pkgs.libvirt ];
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systemd.services.libvirtd = {
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description = "Libvirt Virtual Machine Management Daemon";
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wantedBy = [ "multi-user.target" ];
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after = [ "systemd-udev-settle.service" ]
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++ optional vswitch.enable "vswitchd.service";
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environment = {
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LIBVIRTD_ARGS = ''--config "${configFile}" ${concatStringsSep " " cfg.extraOptions}'';
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};
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path = with pkgs; [
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bridge-utils
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dmidecode
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dnsmasq
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ebtables
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]
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++ optional vswitch.enable vswitch.package;
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preStart = ''
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mkdir -p /var/log/libvirt/qemu -m 755
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rm -f /var/run/libvirtd.pid
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mkdir -p /var/lib/libvirt
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mkdir -p /var/lib/libvirt/dnsmasq
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chmod 755 /var/lib/libvirt
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chmod 755 /var/lib/libvirt/dnsmasq
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# Copy default libvirt network config .xml files to /var/lib
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# Files modified by the user will not be overwritten
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for i in $(cd ${pkgs.libvirt}/var/lib && echo \
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libvirt/qemu/networks/*.xml libvirt/qemu/networks/autostart/*.xml \
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libvirt/nwfilter/*.xml );
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do
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mkdir -p /var/lib/$(dirname $i) -m 755
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cp -npd ${pkgs.libvirt}/var/lib/$i /var/lib/$i
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done
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# Copy generated qemu config to libvirt directory
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cp -f ${qemuConfigFile} /var/lib/libvirt/qemu.conf
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# stable (not GC'able as in /nix/store) paths for using in <emulator> section of xml configs
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mkdir -p /run/libvirt/nix-emulators
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ln -s --force ${pkgs.libvirt}/libexec/libvirt_lxc /run/libvirt/nix-emulators/
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${optionalString pkgs.stdenv.isAarch64 "ln -s --force ${pkgs.qemu}/bin/qemu-system-aarch64 /run/libvirt/nix-emulators/"}
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${optionalString cfg.enableKVM "ln -s --force ${pkgs.qemu_kvm}/bin/qemu-kvm /run/libvirt/nix-emulators/"}
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${optionalString cfg.qemuOvmf ''
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mkdir -p /run/libvirt/nix-ovmf
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ln -s --force ${pkgs.OVMF.fd}/FV/OVMF_CODE.fd /run/libvirt/nix-ovmf/
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ln -s --force ${pkgs.OVMF.fd}/FV/OVMF_VARS.fd /run/libvirt/nix-ovmf/
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''}
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'';
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serviceConfig = {
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Type = "notify";
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KillMode = "process"; # when stopping, leave the VMs alone
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Restart = "no";
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};
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restartIfChanged = false;
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};
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systemd.services.libvirt-guests = {
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wantedBy = [ "multi-user.target" ];
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path = with pkgs; [ coreutils libvirt gawk ];
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restartIfChanged = false;
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};
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systemd.sockets.virtlogd = {
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description = "Virtual machine log manager socket";
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wantedBy = [ "sockets.target" ];
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listenStreams = [ "/run/libvirt/virtlogd-sock" ];
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};
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systemd.services.virtlogd = {
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description = "Virtual machine log manager";
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serviceConfig.ExecStart = "@${pkgs.libvirt}/sbin/virtlogd virtlogd";
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restartIfChanged = false;
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};
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systemd.sockets.virtlockd = {
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description = "Virtual machine lock manager socket";
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wantedBy = [ "sockets.target" ];
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listenStreams = [ "/run/libvirt/virtlockd-sock" ];
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};
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systemd.services.virtlockd = {
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description = "Virtual machine lock manager";
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serviceConfig.ExecStart = "@${pkgs.libvirt}/sbin/virtlockd virtlockd";
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restartIfChanged = false;
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};
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};
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}
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