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.Dd November 16, 2016
.Dt VM-BHYVE 8
.Os
.Sh NAME
.Nm vm
.Nd "utility to manage bhyve virtual machines"
.Sh SYNOPSIS
.Nm
.Cm version
.Nm
.Cm init
.Pp
.Nm
.Cm get
.Ar all
.Op Ar setting
.Op Ar ...
.Nm
.Cm set
.Ar setting=value
.Op Ar ...
.Pp
.Nm
.Cm switch list
.Nm
.Cm switch info
.Op Ar name
.Op Ar ...
.Nm
.Cm switch create
.Op Fl t Ar type
.Op Fl i Ar interface
.Op Fl n Ar vlan-id
.Op Fl b Ar bridge
.Op Fl m Ar mtu
.Op Fl a Ar address
.Op Fl p
.Ar name
.Nm
.Cm switch vlan
.Ar name vlan-id
.Nm
.Cm switch nat
.Ar name on|off
.Nm
.Cm switch address
.Ar name a.b.c.d/xx|none
.Nm
.Cm switch private
.Ar name on|off
.Nm
.Cm switch add
.Ar name interface
.Nm
.Cm switch remove
.Ar name interface
.Nm
.Cm switch destroy
.Ar name
.Pp
.Nm
.Cm datastore list
.Nm
.Cm datastore add
.Ar name spec
.Nm
.Cm datastore remove
.Ar name
.Nm
.Cm datastore iso
.Ar name path
.Pp
.Nm
.Cm create
.Op Fl d Ar datastore
.Op Fl t Ar template
.Op Fl s Ar size
.Op Fl c Ar vCPUs
.Op Fl m Ar memory
.Op Fl i Ar vm-image
.Op Fl C k Ar pubkeys
.Ar name
.Nm
.Cm
.Cm destroy
.Op Fl f
.Ar name
.Nm
.Cm list
.Op Fl rv
.Nm
.Cm info
.Op Ar name
.Op Ar ...
.Nm
.Cm install
.Op Fl fi
.Ar name iso
.Nm
.Cm start
.Op Fl fi
.Ar name
.Ar ...
.Nm
.Cm stop
.Ar name
.Ar ...
.Nm
.Cm restart
.Ar name
.Nm
.Cm console
.Ar name
.Op Ar com1|com2
.Nm
.Cm rename
.Ar name
.Ar new-name
.Nm
.Cm add
.Op Fl d Ar device
.Op Fl t Ar type
.Op Fl s Ar size|switch
.Ar name
.Nm
.Cm reset
.Op Fl f
.Ar name
.Nm
.Cm poweroff
.Op Fl f
.Ar name
.Nm
.Cm startall
.Nm
.Cm stopall
.Op Fl f
.Nm
.Cm configure
.Ar name
.Nm
.Cm passthru
.Nm
.Cm clone
.Ar name[@snapshot]
.Ar new-name
.Nm
.Cm snapshot
.Op Fl f
.Ar name|name@snapshot
.Nm
.Cm rollback
.Op Fl r
.Ar name@snapshot
.Nm
.Cm migrate
.Op Fl s12t
.Op Fl r Ar name
.Op Fl i Ar snapshot
.Op Fl d Ar datastore
.Ar guest host
.Pp
.Nm
.Cm iso
.Op Ar -d datastore
.Op Ar url
.Nm
.Cm img
.Op Ar -d datastore
.Op Ar url
.Pp
.Nm
.Cm image list
.Nm
.Cm image create
.Op Fl d Ar description
.Op Fl u
.Ar name
.Nm
.Cm image provision
.Op Fl d Ar datastore
.Ar uuid
.Ar new-name
.Nm
.Cm image destroy
.Ar uuid
.\" ============ DESCRIPTION =============
.Sh DESCRIPTION
The
.Nm
utility is used to provide simplified management of
.Xr bhyve 8
virtual machines,
including networking and console access.
.Pp
Networking is handled by creating one or more virtual switches.
Each switch has a simple name which is referenced in the virtual machine
configuration file.
The
.Nm
utility automatically creates a
.Xr bridge 4
device for each virtual switch and assigns virtual machine
.Xr tap 4
interfaces dynamically.
.Pp
All configuration for virtual machines is stored in a simple rc style
configuration file.
When virtual machines are first created, the configuration file is copied from
a template which can be specified by the user.
Multiple templates can be created providing an easy way to provision guests
with specific configurations.
.Pp
.Nm
gracefully handles reboot and shutdown commands from inside the guests, whilst
providing full management of the virtual machine from the host system.
.\" ============ BASIC SETUP ============
.Sh BASIC SETUP
Once
.Nm
is installed, create the directory which will store your virtual machine
configuration and data.
This directory will be referred to as
.Pa $vm_dir
throughput this man page.
.Pp
Add the following into
.Pa /etc/rc.conf
.Bd -literal -offset indent
vm_enable="YES"
vm_dir="/your/vm/path"
vm_list=""
vm_delay="5"
.Ed
.Pp
The first and second lines are required to enable the
.Nm
utility.
Please see the
.Cm startall
command description for more information on the third and fourth settings.
.Pp
Now run the
.Nm vm
.Cm init
command to finish initialisation.
This will create subdirectories inside
.Pa $vm_dir
to hold configuration and templates.
It will also load any required kernel modules.
This command needs to be run on each boot, which is normally handled by the
rc.d script.
.Pp
Sample templates are installed to
.Pa /usr/local/share/examples/vm-bhyve/ .
You can make use of these by copying them into your
.Pa $vm_dir/.templates/
directory.
You can create and edit the templates as required.
It is recommended to keep a template called
.Pa default.conf ,
as this will be used when no template is manually specified.
.\" ============ ZFS =============
.Sh ZFS
If you are using a ZFS dataset to store your virtual machines, and want a new
child dataset created for each one, specify the dataset to use in
.Pa /etc/rc.conf
as follows:
.Bd -literal -offset indent
vm_dir="zfs:pool/dataset"
.Ed
.Pp
In contrast to earlier versions, if
.Pa $vm_dir
is a normal path, a standard subdirectory will be created for each virtual
machine, regardless
of the file system type.
However,
.Nm
is now able to handle situations where the dataset mountpoint does not match
the dataset name.
.\" ============ QUICKSTART =============
.Sh QUICKSTART
Create a virtual switch called
.Sy public
(which is the switch name specified in the default templates) and attach it to
a real interface.
Use your own interface in place of
.Sy em0
as required.
.Bd -literal -offset ident
# vm switch create public
# vm switch add public em0
.Ed
.Pp
Download an ISO file to use for installation:
.Bd -literal -offset ident
# vm iso ftp://ftp.freebsd.org/pub/FreeBSD/releases/ISO-IMAGES/10.1/FreeBSD-10.1-RELEASE-amd64-disc1.iso
.Ed
.Pp
Create a new guest using the default template and disk size, then start the
installation.
The
.Ar install
subcommand will immediately return you to your shell.
Once started, use the
.Ar console
command to connect to the guest and complete the installation.
.Bd -literal -offset ident
# vm create my-guest
# vm install my-guest FreeBSD-10.1-RELEASE-amd64-disc1.iso
# vm console my-guest
.Ed
.Pp
Please note that Linux guests currently require the
.Sy sysutils/grub2-bhyve
package to be installed.
This is used in place of
.Xr bhyveload 8
to load the guest kernel into memory.
.\" ============== WINDOWS ===============
.Sh WINDOWS SUPPORT
Windows guests are supported on versions of
.Fx
that have UEFI
support in
.Xr bhyve 8 .
As of April 2016, UEFI support should be available in
.Fx 10.3-RELEASE
and
.Fx 11-CURRENT .
.Pp
You will also need a copy of the UEFI firmware.
This can either be installed using the
.Pa sysutils/edk2
port, or you can manually download a copy (see URL below) to
.Pa $vm_dir/.config/BHYVE_UEFI.fd and configure a guest to use it by setting
.Sy loader="uefi-custom" .
.Pp
If you are running
.Fx 10
, there is no VGA console in
.Xr bhyve 8 ,
and so an unattended installation ISO is required which allows Windows to install and
boot without any user interaction.
Instructions for creating a suitable ISO can be found at the URL below.
.Pp
On
.Fx 11 ,
VGA access can be enabled by setting the
.Sy graphics="yes"
option in the guest configuration file.
Once the guest has started, vnc IP & port details can be seen in
.Sy vm list
output.
See the configuration format documentation below for more detailed information
on configuring graphics.
If network drivers are required, I recommend re-running the
.Sy vm install
command once the guest has been installed, but providing an ISO of the
virtio-net drivers instead.
.Pp
Once the installation ISO is ready, has been placed in the
.Pa $vm_dir/.iso
directory, and you have the UEFI firmware, installation can be performed as
normal.
.Bd -literal -offset indent
# vm create -t windows -s 30G winguest
# vm install winguest win_repack.iso
.Ed
.Pp
Windows installation has been tested with 2012r2 and takes around 20-25
minutes.
During install, the guest will reboot twice (three runs in total).
You can see the guest reboot by watching the log file
.Pa $vm_dir/guestname/vm-bhyve.log .
The third run should boot fully into Windows.
The
.Sy virtio
network adapter will request an IP address using DHCP.
Connect to the guest console and press
.Sy i
to see the IP address that has been assigned.
The default unattended installation files should make RDP available, using
Administrator and Test123 as the default login details.
.Pp
A pre-compiled copy of the UEFI firmware (BHYVE_UEFI_20160526.fd), as well as
instructions for creating an
unattended installation ISO can currently be obtained from
.Lk https://people.freebsd.org/~grehan/bhyve_uefi/
.\" ============ SUBCOMMANDS =============
.Sh SUBCOMMANDS
.Bl -tag -width indent
.It Cm version
Show the version number of vm-bhyve installed.
.It Cm init
.br
This should be run once after each host reboot before running any other
.Nm
commands.
The main function of the
.Cm init
command is as follows:
.Pp
o Load all necessary kernel modules if not already loaded
.br
o Set tap devices to come up automatically when opened
.br
o Create any configured virtual switches
.It Cm get Ar all|setting
Get a global configuration setting.
These are settings that affect the functionality of vm-bhyve, such as
configuring the type of serial console to use.
The keyword
.Sy all
can be used to retrieve all user configurable settings, or you can specify one or
more settings by name, separated by a space.
.It Cm set Ar setting=value
Sets the value of a global configuration setting.
Multiple settings can be changed at the same time by seperating the
.Sy setting=value
pairs with a space.
.Pp
These settings are stored in
.Pa $vm_dir/.config/system.conf
.It Cm switch list
List virtual switches.
This reads all configured virtual switches from the
.Pa $vm_dir/.config/switch
file and displays them.
If the virtual switches are loaded, it also tries to display the
.Xr bridge 4
interface that has been assigned to each one.
.It Cm switch info Op Ar name Op Ar ...
This command shows detailed information about the specified virtual switch(es).
If no switch names are provided, information is output for all configured
switches.
Information displayed includes the following:
.Pp
o Basic switch settings
.br
o Overall bytes sent and received via this switch
.br
o Physical ports connected
.br
o Virtual ports, including the associated virtual machine
.It Xo
.Cm switch create
.Op Fl t Ar type
.Op Fl i Ar interface
.Op Fl n Ar vlan-id
.Op Fl b Ar bridge
.Op Fl m Ar mtu
.Op Fl a Ar address
.Op Fl p
.Ar name
.Xc
Create a new virtual switch.
The name must be supplied and may only contain
letters, numbers and dashes.
However, it may not contain a dash at the beginning or end.
Note that the maximum length of a switch name is also limited to
12 characters, due to the way we use this as the interface name.
.Pp
There are currently 4 types of virtual switch that can be created.
These are
.Sy standard ,
.Sy manual ,
.Sy netgraph ,
.Sy vale
and
.Sy vxlan .
The default type is
.Sy standard ,
which creates a basic
.Xr bridge 4
interface and bridges clients to it.
.Sy manual
allows you to attach guests to a bridge that you have created and configured
manually.
.Sy netgraph
switches use the netgraph ng_bridge system to create a virtual switch connecting
guests.
.Sy vale
switches use the netmap VALE system to create a virtual switch connecting
guests.
.Sy vxlan
allows you to create virtual LANs (similar to a VLAN) which tunnel L2 guest
traffic over L3.
.Bl -tag -width 12n
.It Fl t Ar type
The type of virtual switch to create.
The available types are listed above.
This defaults to
.Sy standard
if not specified.
.It Fl i Ar interface
For
.Sy standard
and
.Sy vxlan
switches you can attach a physical interface at creation time.
This option is required for vxlan switches.
.It Fl n Ar vlan-id
Allows you to specify a VLAN ID for
.Sy standard
and
.Sy vxlan
switches.
This option is required for vxlan switches.
.It Fl b Ar bridge
If creating a manual switch using an existing bridge on your system, this
option allows
you to specify the name of the bridge interface you would like to use.
This option is required for manual switches.
.It Fl m Ar mtu
Specify an mtu to use for the bridge interface.
.It Fl a Ar address
This allows you to specify an IP address that is assigned to the bridge
interface.
This should be specified in
.Sy a.b.c.d/prefix-len
CIDR notation.
.It Fl p
Use this option to create a private switch.
If this is enabled, no traffic will be allowed between guests on the same
switch, however then will all be able to communicate with any physical
interfaces added to the switch.
.El
.It Cm switch vlan Ar name Ar vlan-id
Assign a VLAN number to a virtual switch.
The VLAN number must be between 0-4094.
.Pp
When adding an interface to a VLAN enabled virtual switch, a new
.Xr vlan 4
interface is created.
This interface has the relevant parent interface and VLAN tag configured.
This vlan interface is then added to the virtual switch.
As such, all traffic between guests on the same switch is untagged and travels
freely.
However, all traffic exiting via physical interfaces is tagged.
.Pp
If the virtual switch already has physical interfaces assigned, they are all
removed from the bridge, reconfigured, then re-added.
.Pp
To remove the VLAN configuration from a virtual switch, specify a
.Ar vlan-id
of 0.
.It Cm switch address Ar name Ar a.b.c.d/xx|none
Configure an IP address for the specified virtual switch. The address should
be specified in CIDR notation. To remove an address, specify
.Pa none
in place of the address.
.Pp
If NAT funtionality is required, please configure an address on the switch to
become the gateway address for guests. Source NAT rules can then be created
using your choice of firewall or NAT daemon. If DHCP is desired, we recommend
using a manual switch and configuring this by hand.
.It Cm switch private Ar name Ar on|off
Enable of disable private mode for a virtual switch.
In private mode, guests will only be able to communicate with the physical
interface(s), not with each other.
.Pp
Please note that changing this setting does not affect guests that are already
running, but will be applied to any guests started from cold-boot thereafter.
.It Cm switch add Ar name Ar interface
Add the specified interface to the named virtual switch.
.Pp
The interface will immediately be added to the relevant bridge if possible, and
stored in the persistent switch configuration file.
If a
.Ar vlan-id
is specified on the virtual switch, this will cause a new
.Xr vlan 4
interface to be created.
.It Cm switch remove Ar name Ar interface
Removes the specified interface from the named virtual switch and updates the
persistent configuration file.
.It Cm switch destroy Ar name
Completely remove the named virtual switch and all configuration.
The associated
.Xr bridge 4
interface will be removed, as well as any
.Xr vlan 4
interfaces if they are not in use by other virtual switches.
.It Cm datastore list
List the configured datastores.
Normally
.Sy vm-bhyve
will store all guests under the directory specified in
.Pa /etc/rc.conf .
This is the
.Sy default
datastore.
Additional datastores can be added, providing the ability to store guests in
multiple locations on your system.
.It Cm datastore add Ar name spec
Add a new datastore to the system.
The datastore name can only contain letters, numbers and _. characters.
The
.Pa spec
should use the same format as
.Sy $vm_dir .
A standard directory can be specified by just providing the path, whereas a ZFS
storage location should be specified in
.Sy zfs:pool/dataset
format.
.Pp
Please note that the directory or dataset should already exist.
We do not try to create it.
.It Cm datastore remove Ar name
Remove the specified datastore from the list.
This does not destroy the directory or dataset, leaving all files intact.
.It Cm datastore iso Ar name path
Adds a new datastore location for storing iso files.
Guests cannot be created in an iso store, but this provides an easy way to
configure vm-bhyve to look in any arbitrary location on your system (or mounted
network share) where you may want to store iso images.
.It Xo
.Cm create
.Op Fl d Ar datastore
.Op Fl t Ar template
.Op Fl s Ar size
.Ar name
.Xc
Create a new virtual machine.
.Pp
Unless specified, the
.Pa default.conf
template will be used and a 20GB virtual disk image is created.
This command will create the virtual machine directory
.Pa $vm_dir/$name ,
and create the configuration file and empty disk image within.
.Bl -tag -width 12n
.It Fl d Ar datastore
Specify the datastore to create this virtual machine under.
If not specified, the
.Sy default
dataset will be used, which is the location specified in
.Pa /etc/rc.conf .
.It Fl t Ar template
Specifies the template to use from within the
.Pa $vm_dir/.templates
directory.
The
.Sy .conf
suffix should not be included.
.It Fl s Ar size
The size of disk image to create in bytes.
Unless specified, the guest image will be a sparse file 20GB in size.
.El
.It Cm destroy Ar name
Removes the specified virtual machine from the system, deleting all associated
disk images & configuration.
.It Xo
.Cm list
.Op Fl rv
.Xc
.br
List all the virtual machines in the
.Pa $vm_dir
directory.
This will show the basic configuration for each virtual machine, and whether
they are currently running. Using the
.Ar -v
option displays additional information about each virtual machine.
.Pp
If the
.Ar -r
option is specified, only running guests are listed.
.It Cm info Op Ar name Op Ar ...
Shows detailed information about the specified virtual machine(s).
If no names are given, information for all virtual machines is displayed.
.Pp
This output includes detailed information about network and disk devices,
including the space usage for all virtual disks (excluding custom disk
devices).
If the guest is running, the output also shows the amount of host memory
currently in use, and additional network details including bytes sent/received
for each virtual interface.
.It Xo
.Cm install
.Op Fl fi
.Ar name Ar iso
.Xc
Start a guest installation for the named virtual machine, using the specified
ISO file or install disk image.
The
.Ar iso
argument should be the filename of an ISO or image file already downloaded into the
.Pa $vm_dir/.iso
directory (or any media datastore), a full path, or a file in the current
directory.
ISO files in the default .iso store can be downloaded using the
.Ar iso
subcommand described below.
.Pp
By default the installation is started in the background.
Use the
.Ar console
command to connect and begin the installation.
.Pp
After installation, the guest can be rebooted and will restart using its own
disk image to boot.
At this point the installation ISO file is still attached, allowing you to use
the CD/DVD image for any post installation tasks.
The ISO file will remain attached after each reboot until the guest is fully
stopped.
.Pp
If the
.Ar -f
option is specified, the guest will be started in the foreground on stdio.
The
.Ar -i
option starts the guest in interactive mode.
This requires tmux, and the global
.Sy console
setting must be set likewise.
In interactive mode the guest is started on a foreground tmux session, but this
can be detached using the standard tmux commands.
.It Xo
.Cm start
.Op Fl fi
.Ar name Ar ...
.Xc
Start the named virtual machine(s).
The guests will boot and run completely in the background.
Use the
.Ar console
subcommand to connect to it if required.
.Pp
For each network adapter specified in the guest configuration, a
.Xr tap 4
interface will be created.
If possible, the tap interface will be attached the relevant
.Xr bridge 4
interface, based on the virtual switch specified in the guest configuration.
.Pp
If the
.Ar -f
option is specified, the guest will be started in the foreground on stdio.
The
.Ar -i
option starts the guest in interactive mode.
This requires tmux, and the global
.Sy console
setting must be set likewise.
In interactive mode the guest is started on a foreground
tmux session, but this can be detached using the standard tmux commands.
.It Cm stop Ar name Ar ...
Stop a named virtual machine.
All
.Xr tap 4
and
.Xr nmdm 4
devices will be automatically cleaned up once the guest has exited.
.Pp
If a guest is stuck in the bootloader stage, you are given the option to forcibly stop it.
.Pp
Multiple guests can be specified to this command at the same time.
Each one will be sent a poweroff event.
.It Cm restart Ar name
Attempt to restart the specified guest. This causes a shutdown event to be sent to the
guest, however, vm-bhyve will restart the guest rather than stopping completely.
.Pp
A benfit of using this function is that vm-bhyve will not destroy and recreate network devices like
it would when using
.Sy stop/start .
Note that guest configuration is not re-loaded, so all guest settings will be as they were
when the guest was originally started.
.It Cm console Ar name Op Ar com1|com2
Connect to the console of the named virtual machine.
Without network access, this is the primary way of connecting to the guest once
it is running.
.Pp
By default this will connect to the first com port specified in the client
configuration, which is usually com1.
Alternatively you can specify the com port to connect to.
.Pp
This looks for the
.Xr nmdm 4
device associated with the virtual machine, and connects to it with
.Xr cu 1 .
Use ~+Ctrl-D to exit the console and return to the host.
.It Cm rename Ar name Ar new-name
Renames the specified virtual machine.
The guest must be stopped to use this function.
.It Xo
.Cm add
.Op Fl d Ar device
.Op Fl t Ar type
.Op Fl s Ar size|switch
.Ar name
.Xc
Add a new network or disk device to the named virtual machine.
The options depend on the type of device that is being added:
.Bl -tag -width 15n
.It Fl d Ar device
The type of device to add.
Currently this can either be
.Pa disk
or
.Pa network
.It Fl t Ar type
For disk devices, this specifies the type of disk device to create.
Valid options for this are
.Pa zvol ,
.Pa sparse-zvol
and
.Pa file .
If not specified, this defaults to
.Pa file .
.It Fl s Ar size|switch
For disk devices, this is used to specify the size of the disk image to create.
For network devices, use this option to specify the virtual switch to connect
the network interface to.
.El
.Pp
For both types of device, the emulation type will be chosen automatically based
on the emulation used for the existing guest devices.
.It Xo
.Cm reset
.Op Fl f
.Ar name
.Xc
Forcefully reset the named virtual machine.
This can cause corruption to the guest file system just as with real hardware
and should only be used if necessary.
.It Xo
.Cm poweroff
.Op Fl f
.Ar name
.Xc
Forcefully power off the named virtual machine.
As with
.Ar reset
above, this does not inform the guest to shutdown gracefully and should only be
used if the guest
can not be shut down using normal methods.
.It Cm startall
Start all virtual machines configured for auto-start.
This is the command used by the rc.d scripts to start all machines on boot.
.Pp
The list of virtual machines should be specified using the
.Pa $vm_list
variable in
.Pa /etc/rc.conf .
This allows you to use shared storage for virtual machine data, whilst making
sure that the correct guests are started automatically on each host.
(Or to just make sure your required guests start on boot whilst leaving
test/un-needed guests alone)
.Pp
The delay between starting guests can be set using the
.Pa $vm_delay
variable, which defaults to 5 seconds.
Too small a delay can cause problems, as each guest doesn't have enough time to
claim a null modem device before the next guest starts.
Increasing this value can be useful if you have disk-intensive guests and want
to give each guest a chance to fully boot before the next starts.
.It Cm stopall
Stop all running virtual machines.
This sends a stop command to all
.Xr bhyve 8
instances, regardless of whether they were starting using
.Nm
or not.
.It Cm configure Ar name
The
.Cm configure
command simply opens the virtual machine configuration file in your default
editor, allowing you to easily make changes.
Please note, changes do not take effect until the virtual machine is fully
shutdown and restarted.
.It Cm passthru
The
.Cm passthru
command lists all PCI devices in the system, the device ID required for bhyve,
and whether the device is currently ready to be used by a guest.
In order to make a device ready, it needs to be reserved on boot by adding the
device ID to the
.Sy pptdevs
variable in
.Pa /boot/loader.conf .
.Pp
Once a device is ready, it can be assigned to a guest by adding
.Sy passthruX="{ID}"
to the guest's configuration file.
.Sy X
should be an integer starting at 0 for the first passthrough device.
.Pp
More details can be found in the bhyve wiki.
.It Cm clone Ar name[@snapshot] Ar new-name
Create a clone of the virtual machine
.Pa name ,
as long as it is currently powered off.
The new machine will be called
.Pa new-name ,
and will be ready to boot with a newly assigned UUID and empty log file.
.Pp
If no snapshot name is given, a new snapshot will be taken of the guest and any
descendant datasets or ZVOLs.
If you wish to use an existing snapshot as the source for the clone, please
make sure the snapshot exists for the guest and any child ZVOLs, otherwise the
clone will fail.
.Pp
Please note that this function requires ZFS.
.It Xo
.Cm snapshot
.Op Fl f
.Ar name|name@snapshot
.Xc
Create a snapshot of the names virtual machine.
This command is only supported with ZFS and will take a snapshot of the guest
dataset and any descendant ZVOL devices.
.Pp
The guest and snapshot name can be specified in the normal
.Pa name@snapshot
way familiar to ZFS users.
If no snapshot name is given, the snapshot is based on the current timestamp in
.Pa Y-m-d-H:M:S
format.
.Pp
By default the guest must be stopped to use this command, although you can
force a snapshot of a running guest by using the
.Fl f
option.
.It Xo
.Cm rollback
.Op Fl r
.Ar name@snapshot
.Xc
Rollback the guest to the specified snapshot.
This will roll back the guest dataset and all descendant ZVOL devices.
.Pp
Normally, ZFS will only allow you to roll back to the most recent snapshot.
If the snapshot given is not the most recent, ZFS will produce a warning
detailing that you need to use the
.Fl r
option to remove the more recent snapshots.
It will also produce a list of the snapshots that will be destroyed if you use
this option.
The
.Fl r
option can be passed directly into
.Nm
.Cm rollback
.Pp
The guest must always be stopped to use this command.
.It Xo
.Cm migrate
.Op Fl s12t
.Op Fl r Ar name
.Op Fl i Ar snapshot
.Op Fl d Ar datastore
.Ar guest host
.Xc
The migrate command allows transferring a guest from one host to another. Note that
currently this involves shutting down the guest, and optionally restarting it once
migration is complete.
.Pp
The migration process uses ssh, and works best if key-based ssh is enabled between
your hosts without the requirement of a password. Transfer is still possible using a password,
but you will be prompted for this several times during the transfer process.
.Pp
Firstly a full snapshot of the guest is sent while the guest is still running. Optionally, an intermediate
incremental snapshot can then be sent to bring the remote guest up to date if it is expected that the full
send may take a long time, or that a large amount of data may change during this time. Once the remote end
is reasonably up to date, the guest is powered off so a final incremental snapshot can be sent.
.Bl -tag -width 12n
.It Fl r Ar name
Allows the remote guest to be given a different name to the source.
.It Fl d Ar datastore
Specify the datastore to store the guest on the destination host.
.It Fl s
Start the guest on the remote host once migration is complete.
.It Fl 1
Run only the first stage of migration. This will take a full snapshot of the local guest and send it to
the destination host.
.It Fl 2
Run only the second stage. This will second an incremental snapshot and then complete the migration.
This requires the
.Fl i
parameter to specify the source snapshot.
.It Fl t
Triple snapshot mode. This will send both a full snapshot, and one incremental, before shutting the guest down
and doing a final incremental send. This may be useful for large or busy guests where there could be a large number
of chages during the initial full send. The idea is that the first incremental send will bring the remote guest nearly
up to date, sending changes that have occured during the lengthy inital full send. This should reduce the size of the
final incremental send, minimising the amount of time the guest is powered off.
.It Fl x
Destroy the local guest once the migration is complete.
.It Fl i Ar snapshot
When running the second stage of migration, this parameter is used to specify the name of the snapshot
to base the incremental send on. This snapshot must exist on both hosts.
.El
.It Xo
.Cm iso
.Op Ar -d datastore
.Op Ar url
.Xc