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68719c4bdd
Disk format probing is now disabled by default. A new config option in /etc/qemu/qemu.conf will re-enable it for existing deployments where this causes trouble
202 lines
7.0 KiB
Plaintext
202 lines
7.0 KiB
Plaintext
# Master configuration file for the QEMU driver.
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# All settings described here are optional - if omitted, sensible
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# defaults are used.
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# VNC is configured to listen on 127.0.0.1 by default.
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# To make it listen on all public interfaces, uncomment
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# this next option.
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#
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# NB, strong recommendation to enable TLS + x509 certificate
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# verification when allowing public access
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#
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# vnc_listen = "0.0.0.0"
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# Enable use of TLS encryption on the VNC server. This requires
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# a VNC client which supports the VeNCrypt protocol extension.
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# Examples include vinagre, virt-viewer, virt-manager and vencrypt
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# itself. UltraVNC, RealVNC, TightVNC do not support this
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#
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# It is necessary to setup CA and issue a server certificate
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# before enabling this.
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#
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# vnc_tls = 1
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# Use of TLS requires that x509 certificates be issued. The
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# default it to keep them in /etc/pki/libvirt-vnc. This directory
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# must contain
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#
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# ca-cert.pem - the CA master certificate
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# server-cert.pem - the server certificate signed with ca-cert.pem
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# server-key.pem - the server private key
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#
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# This option allows the certificate directory to be changed
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#
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# vnc_tls_x509_cert_dir = "/etc/pki/libvirt-vnc"
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# The default TLS configuration only uses certificates for the server
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# allowing the client to verify the server's identity and establish
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# and encrypted channel.
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#
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# It is possible to use x509 certificates for authentication too, by
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# issuing a x509 certificate to every client who needs to connect.
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#
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# Enabling this option will reject any client who does not have a
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# certificate signed by the CA in /etc/pki/libvirt-vnc/ca-cert.pem
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#
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# vnc_tls_x509_verify = 1
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# The default VNC password. Only 8 letters are significant for
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# VNC passwords. This parameter is only used if the per-domain
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# XML config does not already provide a password. To allow
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# access without passwords, leave this commented out. An empty
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# string will still enable passwords, but be rejected by QEMU
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# effectively preventing any use of VNC. Obviously change this
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# example here before you set this
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#
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# vnc_password = "XYZ12345"
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# Enable use of SASL encryption on the VNC server. This requires
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# a VNC client which supports the SASL protocol extension.
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# Examples include vinagre, virt-viewer and virt-manager
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# itself. UltraVNC, RealVNC, TightVNC do not support this
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#
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# It is necessary to configure /etc/sasl2/qemu.conf to choose
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# the desired SASL plugin (eg, GSSPI for Kerberos)
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#
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# vnc_sasl = 1
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# The default SASL configuration file is located in /etc/sasl2/
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# When running libvirtd unprivileged, it may be desirable to
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# override the configs in this location. Set this parameter to
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# point to the directory, and create a qemu.conf in that location
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#
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# vnc_sasl_dir = "/some/directory/sasl2"
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# The default security driver is SELinux. If SELinux is disabled
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# on the host, then the security driver will automatically disable
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# itself. If you wish to disable QEMU SELinux security driver while
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# leaving SELinux enabled for the host in general, then set this
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# to 'none' instead
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#
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# security_driver = "selinux"
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# The user ID for QEMU processes run by the system instance
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#user = "root"
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# The group ID for QEMU processes run by the system instance
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#group = "root"
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# Whether libvirt should dynamically change file ownership
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# to match the configured user/group above. Defaults to 1.
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# Set to 0 to disable file ownership changes.
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#dynamic_ownership = 1
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# What cgroup controllers to make use of with QEMU guests
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#
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# - 'cpu' - use for schedular tunables
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# - 'devices' - use for device whitelisting
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#
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# NB, even if configured here, they won't be used unless
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# the adminsitrator has mounted cgroups. eg
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#
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# mkdir /dev/cgroup
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# mount -t cgroup -o devices,cpu none /dev/cgroup
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#
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# They can be mounted anywhere, and different controlers
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# can be mounted in different locations. libvirt will detect
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# where they are located.
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#
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# cgroup_controllers = [ "cpu", "devices" ]
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# This is the basic set of devices allowed / required by
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# all virtual machines.
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#
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# As well as this, any configured block backed disks,
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# all sound device, and all PTY devices are allowed.
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#
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# This will only need setting if newer QEMU suddenly
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# wants some device we don't already know a bout.
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#
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#cgroup_device_acl = [
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# "/dev/null", "/dev/full", "/dev/zero",
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# "/dev/random", "/dev/urandom",
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# "/dev/ptmx", "/dev/kvm", "/dev/kqemu",
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# "/dev/rtc", "/dev/hpet", "/dev/net/tun",
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#]
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# The default format for Qemu/KVM guest save images is raw; that is, the
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# memory from the domain is dumped out directly to a file. If you have
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# guests with a large amount of memory, however, this can take up quite
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# a bit of space. If you would like to compress the images while they
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# are being saved to disk, you can also set "lzop", "gzip", "bzip2", or "xz"
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# for save_image_format. Note that this means you slow down the process of
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# saving a domain in order to save disk space; the list above is in descending
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# order by performance and ascending order by compression ratio.
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#
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# save_image_format = "raw"
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# If provided by the host and a hugetlbfs mount point is configured,
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# a guest may request huge page backing. When this mount point is
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# unspecified here, determination of a host mount point in /proc/mounts
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# will be attempted. Specifying an explicit mount overrides detection
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# of the same in /proc/mounts. Setting the mount point to "" will
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# disable guest hugepage backing.
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#
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# NB, within this mount point, guests will create memory backing files
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# in a location of $MOUNTPOINT/libvirt/qemu
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# hugetlbfs_mount = "/dev/hugepages"
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# mac_filter enables MAC addressed based filtering on bridge ports.
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# This currently requires ebtables to be installed.
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#
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# mac_filter = 1
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# By default, PCI devices below non-ACS switch are not allowed to be assigned
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# to guests. By setting relaxed_acs_check to 1 such devices will be allowed to
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# be assigned to guests.
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#
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# relaxed_acs_check = 1
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# QEMU implements an extension for providing audio over a VNC connection,
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# though if your VNC client does not support it, your only chance for getting
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# sound output is through regular audio backends. By default, libvirt will
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# disable all QEMU sound backends if using VNC, since they can cause
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# permissions issues. Enabling this option will make libvirtd honor the
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# QEMU_AUDIO_DRV environment variable when using VNC.
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#
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# vnc_allow_host_audio = 0
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# If clear_emulator_capabilities is enabled, libvirt will drop all
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# privileged capabilities of the QEmu/KVM emulator. This is enabled by
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# default.
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#
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# Warning: Disabling this option means that a compromised guest can
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# exploit the privileges and possibly do damage to the host.
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#
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# clear_emulator_capabilities = 1
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# If allow_disk_format_probing is enabled, libvirt will probe disk
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# images to attempt to identify their format, when not otherwise
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# specified in the XML. This is disabled by default.
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#
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# WARNING: Enabling probing is a security hole in almost all
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# deployments. It is strongly recommended that users update their
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# guest XML <disk> elements to include <driver type='XXXX'/>
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# elements instead of enabling this option.
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# allow_disk_format_probing = 1
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