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Sys::Virt::Domain(3) User Contributed Perl Documentation Sys::Virt::Domain(3)

NAME

Sys::Virt::Domain - Represent & manage a libvirt guest domain

DESCRIPTION

The "Sys::Virt::Domain" module represents a guest domain managed by the virtual machine monitor.

METHODS

Returns an integer with a locally unique identifier for the domain.
Returns a 16 byte long string containing the raw globally unique identifier (UUID) for the domain.
Returns a printable string representation of the raw UUID, in the format 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX'.
Returns a string with a locally unique name of the domain
Returns a string representing the hostname of the guest
Returns the metadata element of type $type associated with the domain. If $type is "Sys::Virt::Domain::METADATA_ELEMENT" then the $uri parameter specifies the XML namespace to retrieve, otherwise $uri should be "undef". The optional $flags parameter defaults to zero.
$dom->set_metadata($type, $val, $key, $uri, $flags=0)
Sets the metadata element of type $type to hold the value $val. If $type is "Sys::Virt::Domain::METADATA_ELEMENT" then the $key and $uri elements specify an XML namespace to use, otherwise they should both be "nudef". The optional $flags parameter defaults to zero.
$dom->is_active()
Returns a true value if the domain is currently running
$dom->is_persistent()
Returns a true value if the domain has a persistent configuration file defined
$dom->is_updated()
Returns a true value if the domain is running and has a persistent configuration file defined that is out of date compared to the current live config.
Returns an XML document containing a complete description of the domain's configuration. The optional $flags parameter controls generation of the XML document, defaulting to 0 if omitted. It can be one or more of the XML DUMP constants listed later in this document.
Returns a string containing the name of the OS type running within the domain.
$dom->create($flags)
Start a domain whose configuration was previously defined using the "define_domain" method in Sys::Virt. The $flags parameter accepts one of the DOMAIN CREATION constants documented later, and defaults to 0 if omitted.
$dom->undefine()
Remove the configuration associated with a domain previously defined with the "define_domain" method in Sys::Virt. If the domain is running, you probably want to use the "shutdown" or "destroy" methods instead.
$dom->suspend()
Temporarily stop execution of the domain, allowing later continuation by calling the "resume" method.
$dom->resume()
Resume execution of a domain previously halted with the "suspend" method.
$dom->pm_wakeup()
Wakeup the guest from power management suspend state
$dom->pm_suspend_for_duration($target, $duration, $flags=0)
Tells the guest OS to enter the power management suspend state identified by $target. The $target parameter should be one of the NODE SUSPEND CONTANTS listed in "Sys::Virt". The $duration specifies when the guest should automatically wakeup. The $flags parameter is optional and defaults to zero.
$dom->save($filename)
Take a snapshot of the domain's state and save the information to the file named in the $filename parameter. The domain can later be restored from this file with the "restore_domain" method on the Sys::Virt object.
$dom->managed_save($flags=0)
Take a snapshot of the domain's state and save the information to a managed save location. The domain will be automatically restored with this state when it is next started. The $flags parameter is unused and defaults to zero.
$bool = $dom->has_managed_save_image($flags=0)
Return a non-zero value if the domain has a managed save image that will be used at next start. The $flags parameter is unused and defaults to zero.
$dom->managed_save_remove($flags=0)
Remove the current managed save image, causing the guest to perform a full boot next time it is started. The $flags parameter is unused and defaults to zero.
$dom->core_dump($filename[, $flags])
Trigger a core dump of the guest virtual machine, saving its memory image to $filename so it can be analysed by tools such as "crash". The optional $flags flags parameter is currently unused and if omitted will default to 0.
$dom->destroy()
Immediately poweroff the machine. This is equivalent to removing the power plug. The guest OS is given no time to cleanup / save state. For a clean poweroff sequence, use the "shutdown" method instead.
Returns a hash reference summarising the execution state of the domain. The elements of the hash are as follows:
The maximum memory allowed for this domain, in kilobytes
The current memory allocated to the domain in kilobytes
The amount of CPU time used by the domain
The current number of virtual CPUs enabled in the domain
The execution state of the machine, which will be one of the constants &Sys::Virt::Domain::STATE_*.
Returns an array whose values specify the current state of the guest, and the reason for it being in that state. The $state values are the same as for the "get_info" API, and the $reason values come from:
It is not known why the domain has crashed
It is not known why the domain has no state
The guest is paused due to a core dump operation
The guest is paused due to a snapshot
The guest is paused due to an I/O error
The guest is paused due to migration
The guest is paused due to a save operation
It is not known why the domain has paused
The guest is paused at admin request
The guest is paused due to the watchdog
The guest is paused while domain shutdown takes place
The guest is running after being booted
The guest is running after restore from snapshot
The guest is running after migration
The guest is running after migration abort
The guest is running after restore from file
The guest is running after save cancel
It is not known why the domain has started
The guest is running after a resume
The guest is running after wakeup from power management suspend
The guest is blocked for an unknown reason
It is not known why the domain has shutdown
The guest is shutdown due to admin request
The guest is shutoff after a crash
The guest is shutoff after being destroyed
The guest is shutoff due to a virtualization failure
The guest is shutoff after a snapshot
The guest is shutoff after migration
The guest is shutoff after a save
The guest is shutoff due to controlled shutdown
It is not known why the domain has shutoff
It is not known why the domain was suspended
Returns a hash reference providing information about the control channel. The returned keys in the hash are
"state"
One of the CONTROL INFO constants listed later
"details"
Currently unsed, always 0.
"stateTime"
The elapsed time since the control channel entered the current state.
Returns a list of all disk errors that have occurred on the backing store for the guest's virtual disks. The returned array elements are hash references, containing two keys
"path"
The path of the disk with an error
"error"
The error type
$dom->send_key($keycodeset, $holdtime, \@keycodes, $flags=0)
Sends a sequence of keycodes to the guest domain. The $keycodeset should be one of the constants listed later in the KEYCODE SET section. $holdtiem is the duration, in milliseconds, to keep the key pressed before releasing it and sending the next keycode. @keycodes is an array reference containing the list of keycodes to send to the guest. The elements in the array should be keycode values from the specified keycode set. $flags is currently unused.
Returns a hash reference summarising the disk usage of the host backing store for a guest block device. The $dev parameter should be the path to the backing store on the host. $flags is currently unused and defaults to 0 if omitted. The returned hash contains the following elements
Logical size in bytes of the block device backing image *
Highest allocated extent in bytes of the block device backing image
Physical size in bytes of the container of the backing image
$dom->set_max_memory($mem)
Set the maximum memory for the domain to the value $mem. The value of the $mem parameter is specified in kilobytes.
$mem = $dom->get_max_memory()
Returns the current maximum memory allowed for this domain in kilobytes.
$dom->set_memory($mem, $flags)
Set the current memory for the domain to the value $mem. The value of the $mem parameter is specified in kilobytes. This must be less than, or equal to the domain's max memory limit. The $flags parameter can control whether the update affects the live guest, or inactive config, defaulting to modifying the current state.
$dom->shutdown()
Request that the guest OS perform a graceful shutdown and poweroff. This usually requires some form of cooperation from the guest operating system, such as responding to an ACPI signal, or a guest agent process. For an immediate, forceful poweroff, use the "destroy" method instead.
$dom->reboot([$flags])
Request that the guest OS perform a graceful shutdown and optionally restart. The optional $flags parameter is currently unused and if omitted defaults to zero.
$dom->reset([$flags])
Perform a hardware reset of the virtual machine. The guest OS is given no opportunity to shutdown gracefully. The optional $flags parameter is currently unused and if omitted defaults to zero.
$dom->get_max_vcpus()
Return the maximum number of vcpus that are configured for the domain
$dom->attach_device($xml[, $flags])
Hotplug a new device whose configuration is given by $xml, to the running guest. The optional <$flags> parameter defaults to 0, but can accept one of the device hotplug flags described later.
$dom->detach_device($xml[, $flags])
Hotunplug a existing device whose configuration is given by $xml, from the running guest. The optional <$flags> parameter defaults to 0, but can accept one of the device hotplug flags described later.
$dom->update_device($xml[, $flags])
Update the configuration of an existing device. The new configuration is given by $xml. The optional <$flags> parameter defaults to 0 but can accept one of the device hotplug flags described later.
$data = $dom->block_peek($path, $offset, $size[, $flags)
Peek into the guest disk $path, at byte $offset capturing $size bytes of data. The returned scalar may contain embedded NULLs. The optional $flags parameter is currently unused and if omitted defaults to zero.
$data = $dom->memory_peek($offset, $size[, $flags])
Peek into the guest memory at byte $offset virtual address, capturing $size bytes of memory. The return scalar may contain embedded NULLs. The optional $flags parameter is currently unused and if omitted defaults to zero.
$flag = $dom->get_autostart();
Return a true value if the guest domain is configured to automatically start upon boot. Return false, otherwise
$dom->set_autostart($flag)
Set the state of the autostart flag, which determines whether the guest will automatically start upon boot of the host OS
$dom->set_vcpus($count, [$flags])
Set the number of virtual CPUs in the guest VM to $count. The optional $flags parameter can be used to control whether the setting changes the live config or inactive config.
$count = $dom->get_vcpus([$flags])
Get the number of virtual CPUs in the guest VM. The optional $flags parameter can be used to control whether to query the setting of the live config or inactive config.
$type = $dom->get_scheduler_type()
Return the scheduler type for the guest domain
$stats = $dom->block_stats($path)
Fetch the current I/O statistics for the block device given by $path. The returned hash reference contains keys for
"rd_req"
Number of read requests
"rd_bytes"
Number of bytes read
"wr_req"
Number of write requests
"wr_bytes"
Number of bytes written
"errs"
Some kind of error count
Return the set of scheduler tunable parameters for the guest, as a hash reference. The precise set of keys in the hash are specific to the hypervisor.
$dom->set_scheduler_parameters($params, $flags=0)
Update the set of scheduler tunable parameters. The value names for tunables vary, and can be discovered using the "get_scheduler_params" call
Return a hash reference containing the set of memory tunable parameters for the guest. The keys in the hash are one of the constants MEMORY PARAMETERS described later. The $flags parameter accepts one or more the CONFIG OPTION constants documented later, and defaults to 0 if omitted.
$dom->set_memory_parameters($params, $flags=0)
Update the memory tunable parameters for the guest. The $params should be a hash reference whose keys are one of the MEMORY PARAMETERS constants. The $flags parameter accepts one or more the CONFIG OPTION constants documented later, and defaults to 0 if omitted.
Return a hash reference containing the set of blkio tunable parameters for the guest. The keys in the hash are one of the constants BLKIO PARAMETERS described later. The $flags parameter accepts one or more the CONFIG OPTION constants documented later, and defaults to 0 if omitted.
$dom->set_blkio_parameters($params, $flags=0)
Update the blkio tunable parameters for the guest. The $params should be a hash reference whose keys are one of the BLKIO PARAMETERS constants. The $flags parameter accepts one or more the CONFIG OPTION constants documented later, and defaults to 0 if omitted.
$stats = $dom->get_block_iotune($disk, $flags=0)
Return a hash reference containing the set of blkio tunable parameters for the guest disk $disk. The keys in the hash are one of the constants BLOCK IOTUNE PARAMETERS described later.
$dom->set_block_iotune($disk, $params, $flags=0);
Update the blkio tunable parameters for the guest disk $disk. The $params should be a hash reference whose keys are one of the BLOCK IOTUNE PARAMETERS constants.
Return a hash reference containing the set of interface tunable parameters for the guest. The keys in the hash are one of the constants INTERFACE PARAMETERS described later.
$dom->set_interface_parameters($intf, $params, $flags=0)
Update the interface tunable parameters for the guest. The $params should be a hash reference whose keys are one of the INTERFACE PARAMETERS constants.
Return a hash reference containing the set of numa tunable parameters for the guest. The keys in the hash are one of the constants NUMA PARAMETERS described later. The $flags parameter accepts one or more the CONFIG OPTION constants documented later, and defaults to 0 if omitted.
$dom->set_numa_parameters($params, $flags=0)
Update the numa tunable parameters for the guest. The $params should be a hash reference whose keys are one of the NUMA PARAMETERS constants. The $flags parameter accepts one or more the CONFIG OPTION constants documented later, and defaults to 0 if omitted.
$dom->block_resize($disk, $newsize, $flags=0)
Resize the disk $disk to have new size $newsize KB. If the disk is backed by a special image format, the actual resize is done by the hypervisor. If the disk is backed by a raw file, or block device, the resize must be done prior to invoking this API call, and it merely updates the hypervisor's view of the disk size. The following flags may be used
Treat $newsize as if it were in bytes, rather than KB.
$dom->interface_stats($path)
Fetch the current I/O statistics for the block device given by $path. The returned hash containins keys for
"rx_bytes"
Total bytes received
"rx_packets"
Total packets received
"rx_errs"
Total packets received with errors
"rx_drop"
Total packets drop at reception
"tx_bytes"
Total bytes transmitted
"tx_packets"
Total packets transmitted
"tx_errs"
Total packets transmitted with errors
"tx_drop"
Total packets dropped at transmission.
$dom->memory_stats($flags=0)
Fetch the current memory statistics for the guest domain. The $flags parameter is currently unused and can be omitted. The returned hash containins keys for
"swap_in"
Data read from swap space
"swap_out"
Data written to swap space
"major_fault"
Page fault involving disk I/O
"minor_fault"
Page fault not involving disk I/O
"unused"
Memory not used by the system
"available"
Total memory seen by guest
$info = $dom->get_security_label()
Fetch information about the security label assigned to the guest domain. The returned hash reference has two keys, "model" gives the name of the security model in effect (eg "selinux"), while "label" provides the name of the security label applied to the domain. This method only returns information about the first security label. To retrieve all labels, use "get_security_label_list".
@info = $dom->get_security_label_list()
Fetches information about all security labels assigned to the guest domain. The elements in the returned array are all hash references, whose keys are as described for "get_security_label".
$ddom = $dom->migrate(destcon, flags, dname, uri, bandwidth)
Migrate a domain to an alternative host. The "destcon" parameter should be a "Sys::Virt" connection to the remote target host. If the "flags" parameter is zero offline migration will be performed. The "Sys::Virt::Domain::MIGRATE_LIVE" constant can be used to request live migration. The "dname" parameter allows the guest to be renamed on the target host, if set to "undef", the domains' current name will be maintained. In normal circumstances, the source host determines the target hostname from the URI associated with the "destcon" connection. If the destination host is multi-homed it may be necessary to supply an alternate destination hostame via the "uri" parameter. The "bandwidth" parameter allows network usage to be throttled during migration. If set to zero, no throttling will be performed. The "flags", "dname", "uri" and "bandwidth" parameters are all optional, and if omitted default to zero, "undef", "undef", and zero respectively.
$ddom = $dom->migrate2(destcon, dxml, flags, dname, uri, bandwidth)
Migrate a domain to an alternative host. This function works in the same way as "migrate", except is also allows "dxml" to specify a changed XML configuration for the guest on the target host.
$dom->migrate_to_uri(desturi, flags, dname, bandwidth)
Migrate a domain to an alternative host. The "destri" parameter should be a valid libvirt connection URI for the remote target host. If the "flags" parameter is zero offline migration will be performed. The "Sys::Virt::Domain::MIGRATE_LIVE" constant can be used to request live migration. The "dname" parameter allows the guest to be renamed on the target host, if set to "undef", the domains' current name will be maintained. In normal circumstances, the source host determines the target hostname from the URI associated with the "destcon" connection. If the destination host is multi-homed it may be necessary to supply an alternate destination hostame via the "uri" parameter. The "bandwidth" parameter allows network usage to be throttled during migration. If set to zero, no throttling will be performed. The "flags", "dname" and "bandwidth" parameters are all optional, and if omitted default to zero, "undef", "undef", and zero respectively.
$dom->migrate_to_uri2(dconnuri, miguri, dxml, flags, dname, bandwidth)
Migrate a domain to an alternative host. This function works in almost the same way as "migrate_to_uri", except is also allows "dxml" to specify a changed XML configuration for the guest on the target host. The "dconnuri" must always specify the URI of the remote libvirtd daemon, or be "undef". The "miguri" parameter can be used to specify the URI for initiating the migration operation, or be "undef".
$dom->migrate_set_max_downtime($downtime, $flags)
Set the maximum allowed downtime during migration of the guest. A longer downtime makes it more likely that migration will complete, at the cost of longer time blackout for the guest OS at the switch over point. The "downtime" parameter is measured in milliseconds. The $flags parameter is currently unused and defaults to zero.
$dom->migrate_set_max_speed($bandwidth, $flags)
Set the maximum allowed bandwidth during migration of the guest. The "bandwidth" parameter is measured in MB/second. The $flags parameter is currently unused and defaults to zero.
$bandwidth = $dom->migrate_get_max_speed($flag)
Get the maximum allowed bandwidth during migration fo the guest. The returned <bandwidth> value is measured in MB/second. The $flags parameter is currently unused and defaults to zero.
$dom->inject_nmi($flags)
Trigger an NMI in the guest virtual machine. The $flags parameter is currently unused and defaults to 0.
$dom->open_console($st, $devname, $flags)
Open the text console for a serial, parallel or paravirt console device identified by $devname, connecting it to the stream $st. If $devname is undefined, the default console will be opened. $st must be a "Sys::Virt::Stream" object used for bi-directional communication with the console. $flags is currently unused, defaulting to 0.
$dom->open_graphics($idx, $fd, $flags)
Open the graphics console for a guest, identified by $idx, counting from 0. The $fd should be a file descriptor for an anoymous socket pair. The $flags argument should be one of the constants listed at the end of this document, and defaults to 0.
Capture a screenshot of the virtual machine's monitor. The $screen parameter controls which monitor is captured when using a multi-head or multi-card configuration. $st must be a "Sys::Virt::Stream" object from which the data can be read. $flags is currently unused and defaults to 0. The mimetype of the screenshot is returned
@vcpuinfo = $dom->get_vcpu_info($flags=0)
Obtain information about the state of all virtual CPUs in a running guest domain. The returned list will have one element for each vCPU, where each elements contains a hash reference. The keys in the hash are, "number" the vCPU number, "cpu" the physical CPU on which the vCPU is currently scheduled, "cpuTime" the cummulative execution time of the vCPU, "state" the running state and "affinity" giving the allowed shedular placement. The value for "affinity" is a string representing a bitmask against physical CPUs, 8 cpus per character. To extract the bits use the "unpack" function with the "b*" template. NB The "state", "cpuTime", "cpu" values are only available if using $flags value of 0, and the domain is currently running; otherwise they will all be set to zero.
$dom->pin_vcpu($vcpu, $mask)
Pin the virtual CPU given by index $vcpu to physical CPUs given by $mask. The $mask is a string representing a bitmask against physical CPUs, 8 cpus per character.
$mask = $dom->get_emulator_pin_info()
Obtain information about the CPU affinity of the emulator process. The returned $mask is a bitstring against physical CPUs, 8 cpus per character. To extract the bits use the "unpack" function with the "b*" template.
$dom->pin_emulator($newmask, $flags=0)
Pin the emulator threads to the physical CPUs identified by the affinity in $newmask. The $newmask is a bitstring against the physical CPUa, 8 cpus per character. To create a suitable bitstring, use the "vec" function with a value of 1 for the "BITS" parameter.
Requests the guests host physical CPU usage statistics, starting from host CPU <$startCpu> counting upto $numCpus. If $startCpu is -1 and $numCpus is 1, then the utilization across all CPUs is returned. Returns an array of hash references, each element containing stats for one CPU.
Returns a hash reference summarising the execution state of the background job. The elements of the hash are as follows:
The type of job, one of the JOB TYPE constants listed later in this document.
The elapsed time in milliseconds
The expected remaining time in milliseconds. Only set if the "type" is JOB_UNBOUNDED.
The total amount of data expected to be processed by the job, in bytes.
The current amount of data processed by the job, in bytes.
The expected amount of data remaining to be processed by the job, in bytes.
The total amount of mem expected to be processed by the job, in bytes.
The current amount of mem processed by the job, in bytes.
The expected amount of mem remaining to be processed by the job, in bytes.
The total amount of file expected to be processed by the job, in bytes.
The current amount of file processed by the job, in bytes.
The expected amount of file remaining to be processed by the job, in bytes.
$dom->abort_job()
Aborts the currently executing job
Returns a hash reference summarising the execution state of the block job. The $path parameter should be the fully qualified path of the block device being changed.
$dom->set_block_job_speed($path, $bandwidth, $flags=0)
Change the maximum I/O bandwidth used by the block job that is currently executing for $path. The $bandwidth argument is specified in MB/s
$dom->abort_block_job($path, $flags=0)
Abort the current job that is executing for the block device associated with $path
$dom->block_pull($path, $bandwith, $flags=0)
Merge the backing files associated with $path into the top level file. The $bandwidth parameter specifies the maximum I/O rate to allow in MB/s.
$dom->block_rebase($path, $base, $bandwith, $flags=0)
Switch the backing path associated with $path to instead use $base. The $bandwidth parameter specifies the maximum I/O rate to allow in MB/s.
$dom->block_commit($path, $base, $top, $bandwith, $flags=0)
Commit changes there were made to the temporary top level file $top. Takes all the differences between $top and $base and merge them into $base. The $bandwidth parameter specifies the maximum I/O rate to allow in MB/s.
$count = $dom->num_of_snapshots()
Return the number of saved snapshots of the domain
@names = $dom->list_snapshot_names()
List the names of all saved snapshots. The names can be used with the "lookup_snapshot_by_name"
@snapshots = $dom->list_snapshots()
Return a list of all snapshots currently known to the domain. The elements in the returned list are instances of the Sys::Virt::DomainSnapshot class. This method requires O(n) RPC calls, so the "list_all_snapshots" method is recommended as a more efficient alternative.
Return a list of all domain snapshots associated with this domain. The elements in the returned list are instances of the Sys::Virt::DomainSnapshot class. The $flags parameter can be used to filter the list of return domain snapshots.
Return the domain snapshot with a name of $name. The returned object is an instance of the Sys::Virt::DomainSnapshot class.
$dom->has_current_snapshot()
Returns a true value if the domain has a currently active snapshot
$snapshot = $dom->current_snapshot()
Returns the currently active snapshot for the domain.
$snapshot = $dom->create_snapshot($xml[, $flags])
Create a new snapshot from the $xml. The $flags parameter accepts the SNAPSHOT CREATION constants listed in "Sys::Virt::DomainSnapshots".

CONSTANTS

A number of the APIs take a "flags" parameter. In most cases passing a value of zero will be satisfactory. Some APIs, however, accept named constants to alter their behaviour. This section documents the current known constants.

DOMAIN STATE

The domain state constants are useful in interpreting the "state" key in the hash returned by the "get_info" method.

The domain is active, but is not running / blocked (eg idle)
The domain is active and running
The domain is active, but execution is blocked
The domain is active, but execution has been paused
The domain is active, but in the shutdown phase
The domain is inactive, and shut down.
The domain is inactive, and crashed.
The domain is active, but in power management suspend state

CONTROL INFO

The following constants can be used to determine what the guest domain control channel status is

The control channel has a fatal error
The control channel is ready for jobs
The control channel is busy
The control channel is busy with a job

DOMAIN CREATION

The following constants can be used to control the behaviour of domain creation

Keep the guest vCPUs paused after starting the guest
Automatically destroy the guest when the connection is closed (or fails)
Do not use OS I/O cache if starting a domain with a saved state image
Boot the guest, even if there was a saved snapshot

KEYCODE SETS

The following constants define the set of supported keycode sets

The Linux event subsystem keycodes
The original XT keycodes
The AT Set1 keycodes (aka XT)
The AT Set2 keycodes (aka AT)
The AT Set3 keycodes (aka PS2)
The OS-X keycodes
The XT keycodes from the Linux Keyboard driver
The USB HID keycode set
The Windows keycode set
The XT keycode set, with the extended scancodes using the high bit of the first byte, instead of the low bit of the second byte.

MEMORY PEEK

The following constants can be used with the "memory_peek" method's flags parameter

Indicates that the offset is using virtual memory addressing.
Indicates that the offset is using physical memory addressing.

VCPU STATE

The following constants are useful when interpreting the virtual CPU run state

The virtual CPU is not online
The virtual CPU is executing code
The virtual CPU is waiting to be scheduled

OPEN GRAPHICS CONSTANTS

The following constants are used when opening a connection to the guest graphics server

Skip authentication of the client

OPEN CONSOLE CONSTANTS

The following constants are used when opening a connection to the guest console

Force opening of the console, disconnecting any other open session
Check if the console driver supports safe operations

XML DUMP OPTIONS

The following constants are used to control the information included in the XML configuration dump

Report the persistent inactive configuration for the guest, even if it is currently running.
Include security sensitive information in the XML dump, such as passwords.
Update the CPU model definition to match the current executing state.

DEVICE HOTPLUG OPTIONS

The following constants are used to control device hotplug operations

Modify the domain in its current state
Modify only the live state of the domain
Modify only the persistent config of the domain
Force the device to be modified

MEMORY OPTIONS

The following constants are used to control memory change operations

Modify the current state
Modify only the live state of the domain
Modify only the persistent config of the domain
Modify the maximum memory value

CONFIG OPTIONS

The following constants are used to control what configuration a domain update changes

Modify the current state
Modify only the live state of the domain
Modify only the persistent config of the domain

MIGRATE OPTIONS

The following constants are used to control how migration is performed

Migrate the guest without interrupting its execution on the source host.
Manage the migration process over a direct peer-2-peer connection between the source and destination host libvirtd daemons.
Tunnel the migration data over the libvirt daemon connection, rather than the native hypervisor data transport. Requires PEER2PEER flag to be set.
Make the domain persistent on the destination host, defining its configuration file upon completion of migration.
Remove the domain's persistent configuration after migration completes successfully.
Do not re-start execution of the guest CPUs on the destination host after migration completes.
Copy the complete contents of the disk images during migration
Copy the incrementally changed contents of the disk images during migration
Do not allow changes to the virtual domain configuration while migration is taking place. This option is automatically implied if doing a peer-2-peer migration.
Migrate even if the compatibility check indicates the migration will be unsafe to the guest.

UNDEFINE CONSTANTS

The following constants can be used when undefining virtual domain configurations

Also remove any managed save image when undefining the virtual domain
Also remove any snapshot metadata when undefining the virtual domain.

JOB TYPES

The following constants describe the different background job types.

No job is active
A job with a finite completion time is active
A job with an unbounded completion time is active
The job has finished, but isn't cleaned up
The job has hit an error, but isn't cleaned up
The job was aborted at user request, but isn't cleaned up

MEMORY PARAMETERS

The following constants are useful when getting/setting memory parameters for guests

The maximum memory the guest can use.
The memory upper limit enforced during memory contention.
The minimum memory guaranteed to be reserved for the guest.
The maximum swap the guest can use.
The value of an unlimited memory parameter

BLKIO PARAMETERS

The following parameters control I/O tuning for the domain as a whole

The I/O weight parameter
The per-device I/O weight parameter

BLKIO TUNING PARAMETERS

The following parameters control I/O tuning for an individual guest disk.

The total bytes processed per second.
The bytes read per second.
The bytes written per second.
The total I/O operations processed per second.
The I/O operations read per second.
The I/O operations written per second.

SCHEDULER CONSTANTS

The VM cap tunable
The CPU shares tunable
The VM limit tunable
The VM reservation tunable
The VM shares tunable
The VCPU period tunable
The VCPU quota tunable
The VM weight tunable

NUMA PARAMETERS

The following constants are useful when getting/setting the guest NUMA memory policy

The NUMA policy mode
The NUMA nodeset mask

The following constants are useful when interpreting the "Sys::Virt::Domain::NUMA_MODE" parameter value

Allocation is mandatory from the mask nodes
Allocation is preferred from the masked nodes
Allocation is interleaved across all masked nods

INTERFACE PARAMETERS

The following constants are useful when getting/setting the per network interface tunable parameters

The average inbound bandwidth
The peak inbound bandwidth
The burstable inbound bandwidth
The average outbound bandwidth
The peak outbound bandwidth
The burstable outbound bandwidth

VCPU FLAGS

The following constants are useful when getting/setting the VCPU count for a guest

Flag to request the live value
Flag to request the persistent config value
Flag to request the current config value
Flag to request adjustment of the maximum vCPU value

STATE CHANGE EVENTS

The following constants allow domain state change events to be interpreted. The events contain both a state change, and a reason.

Indicates that a persistent configuration has been defined for the domain.
The defined configuration is newly added
The defined configuration is an update to an existing configuration
The domain has resumed execution
The domain resumed because migration has completed. This is emitted on the destination host.
The domain resumed because the admin unpaused it.
The domain resumed because it was restored from a snapshot
The domain has started running
The domain was booted from shutoff state
The domain started due to an incoming migration
The domain was restored from saved state file
The domain was restored from a snapshot
The domain was woken up from suspend
The domain has stopped running
The domain stopped because guest operating system has crashed
The domain stopped because administrator issued a destroy command.
The domain stopped because of a fault in the host virtualization environment.
The domain stopped because it was migrated to another machine.
The domain was saved to a state file
The domain stopped due to graceful shutdown of the guest.
The domain was stopped due to a snapshot
The domain has shutdown but is not yet stopped
The domain finished shutting down
The domain has stopped executing, but still exists
The domain has been suspended due to offline migration
The domain has been suspended due to administrator pause request.
The domain has been suspended due to a block device I/O error.
The domain has been suspended due to resume from snapshot
The domain has been suspended due to the watchdog triggering
The domain has been suspended due to restore from saved state
The persistent configuration has gone away
The domain configuration has gone away due to it being removed by administrator.
The domain has stopped running
The domain has suspend to RAM.

EVENT ID CONSTANTS

Domain lifecycle events
Soft / warm reboot events
RTC clock adjustments
File IO errors, typically from disks
Watchdog device triggering
Graphics client connections.
File IO errors, typically from disks, with a root cause
Errors from the virtualization control channel
Completion status of asynchronous block jobs
Changes in disk media
CDROM media tray state
Power management initiated suspend
Power management initiated wakeup
Balloon target changes

IO ERROR EVENT CONSTANTS

These constants describe what action was taken due to the IO error.

No action was taken, the error was ignored & reported as success to guest
The guest is paused since the error occurred
The error has been reported to the guest OS

WATCHDOG EVENT CONSTANTS

These constants describe what action was taken due to the watchdog firing

No action was taken, the watchdog was ignored
The guest is paused since the watchdog fired
The guest is powered off after the watchdog fired
The guest is reset after the watchdog fired
The guest attempted to gracefully shutdown after the watchdog fired
No action was taken, the watchdog was logged

GRAPHICS EVENT PHASE CONSTANTS

These constants describe the phase of the graphics connection

The initial client connection
The client has been authenticated & the connection is running
The client has disconnected

GRAPHICS EVENT ADDRESS CONSTANTS

These constants describe the format of the address

An IPv4 address
An IPv6 address
An UNIX socket path address

DISK CHANGE EVENT CONSTANTS

These constants describe the reason for a disk change event

The disk media was missing when attempting to start the guest

TRAY CHANGE CONSTANTS

These constants describe the reason for a tray change event

The tray was closed
The tray was opened

DOMAIN BLOCK JOB TYPE CONSTANTS

The following constants identify the different types of domain block jobs

An unknown block job type
The block pull job type
The block copy job type
The block commit job type

DOMAIN BLOCK JOB COMPLETION CONSTANTS

The following constants can be used to determine the completion status of a block job

A successfully completed block job
An unsuccessful block job
A block job canceled byy the user

DOMAIN BLOCK REBASE CONSTANTS

The following constants are useful when rebasing block devices

Limit copy to top of source backing chain
Reuse existing external file for copy
Make destination file raw
Start a copy job

DOMAIN BLOCK JOB ABORT CONSTANTS

The following constants are useful when aborting job copy jobs

Request only, do not wait for completion
Pivot to mirror when ending a copy job

DOMAIN BLOCK COMMIT JOB CONSTANTS

The following constants are useful with block commit job types

Delete any files that are invalid after commit
NULL base means next backing file, not whole chain

DOMAIN SAVE / RESTORE CONSTANTS

The following constants can be used when saving or restoring virtual machines

Do not use OS I/O cache when saving state.
Mark the saved state as paused to prevent the guest CPUs starting upon restore.
Mark the saved state as running to allow the guest CPUs to start upon restore.

DOMAIN CORE DUMP CONSTANTS

The following constants can be used when triggering domain core dumps

Do not pause execution while dumping the guest
Crash the guest after completing the core dump
Do not use OS I/O cache when writing core dump
Reset the virtual machine after finishing the dump
Only include guest RAM in the dump, not the device state

DESTROY CONSTANTS

The following constants are useful when terminating guests using the "destroy" API.

Destroy the guest using the default approach
Destroy the guest in a graceful manner

SHUTDOWN CONSTANTS

The following constants are useful when requesting that a guest terminate using the "shutdown" API

Shutdown using the hypervisor's default mechanism
Shutdown by issuing a command to a guest agent
Shutdown by injecting an ACPI power button press

REBOOT CONSTANTS

The following constants are useful when requesting that a guest terminate using the "reboot" API

Reboot using the hypervisor's default mechanism
Reboot by issuing a command to a guest agent
Reboot by injecting an ACPI power button press

METADATA CONSTANTS

The following constants are useful when reading/writing metadata about a guest

The short human friendly title of the guest
The long free text description of the guest
The structured metadata elements for the guest

DISK ERROR CONSTANTS

The following constants are useful when interpreting disk error codes

No error
The host storage has run out of free space
An unspecified error has ocurred.

MEMORY STATISTIC CONSTANTS

Swap in
Swap out
Minor faults
Major faults
Resident memory
Unused memory
Available memory
Actual balloon limit

DOMAIN LIST CONSTANTS

The following constants can be used when listing domains

Only list domains that are currently active (running, or paused)
Only list domains that are set to automatically start on boot
Only list domains that have a stored snapshot
Only list domains that are currently inactive (shutoff, saved)
Only list domains that have current managed save state
Only list domains that are not set to automatically start on boto
Only list domains that do not have any managed save state
Only list domains that do not have a stored snapshot
Only list domains that are not running, paused or shutoff
Only list domains that are paused
Only list domains which have a persistent config
Only list domains that are currently running
Only list domains that are currently shutoff
Only list domains that do not have a persistent config

SEND KEY CONSTANTS

The following constants are to be used with the "send_key" API

The maximum number of keys that can be sent in a single call to "send_key"

BLOCK STATS CONSTANTS

The following constants provide the names of well known block stats fields

The number of I/O errors
The number of flush requests
The time spent processing flush requests
The amount of data read
The number of read requests
The time spent processing read requests
The amount of data written
The number of write requests
The time spent processing write requests

CPU STATS CONSTANTS

The following constants provide the names of well known cpu stats fields

The total CPU time, including both hypervisor and vCPU time.
THe total time in kernel
The total time in userspace
The total vCPU time.

CPU STATS CONSTANTS

The following constants provide the names of well known schedular parameters

The duration of the time period for scheduling the emulator
The quota for the emulator in one schedular time period

AUTHORS

Daniel P. Berrange <berrange@redhat.com>

COPYRIGHT

Copyright (C) 2006 Red Hat Copyright (C) 2006-2007 Daniel P. Berrange

LICENSE

This program is free software; you can redistribute it and/or modify it under the terms of either the GNU General Public License as published by the Free Software Foundation (either version 2 of the License, or at your option any later version), or, the Artistic License, as specified in the Perl README file.

SEE ALSO

Sys::Virt, Sys::Virt::Error, "http://libvirt.org"

2015-07-28 perl v5.10.1