.\"	$OpenBSD: vmctl.8,v 1.20 2016/11/26 19:49:11 reyk Exp $
.\"
.\" Copyright (c) 2015 Mike Larkin <mlarkin@openbsd.org>
.\"
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.Dd $Mdocdate: November 26 2016 $
.Dt VMCTL 8
.Os
.Sh NAME
.Nm vmctl
.Nd control the virtual machine daemon
.Sh SYNOPSIS
.Nm
.Ar command
.Op Ar arg ...
.Sh DESCRIPTION
The
.Nm
utility is used to control the virtual machine monitor (VMM) subsystem.
A VMM manages virtual machines (VMs) on a host.
The VMM subsystem is responsible for creating, destroying, and executing
VMs.
.Pp
Within the commands,
the
.Ar size
argument can be specified with a human-readable scale,
using the format described in
.Xr scan_scaled 3 .
The
.Ar id
argument can be either a numeric, non-zero identifier or alternatively
the name of a virtual machine.
.Pp
The commands are as follows:
.Bl -tag -width Ds
.It Cm console Ar id
Using
.Xr cu 1
connect to the console of the VM with the specified
.Ar id .
.It Cm create Ar path Fl s Ar size
Creates a VM disk image file with the specified
.Ar path
and
.Ar size ,
rounded to megabytes.
.It Cm load Ar filename
Load the configuration from the specified file.
.It Cm reload
Reload the configuration from the default configuration file.
.It Cm reset Op Cm all
Reset the running state.
.It Cm reset switches
Reset the configured switches.
.It Cm reset vms
Reset and terminate all VMs.
.It Xo Cm start Ar name
.Op Fl c
.Fl k Ar path
.Fl m Ar size
.Op Fl d Ar path
.Op Fl i Ar count
.Op Fl n Ar switch
.Xc
Starts a VM defined by the specified name and parameters:
.Bl -tag -width "-i count"
.It Fl c
Automatically connect to the VM console.
.It Fl d Ar path
Disk image file (may be specified multiple times to add multiple disk images).
.It Fl i Ar count
Number of network interfaces to add to the VM.
.It Fl k Ar path
Kernel to load when booting the VM.
.It Fl m Ar size
Memory
.Ar size
of the VM, rounded to megabytes.
The default is 512M.
.It Fl n Ar switch
Add a network interface that is attached to the specified virtual
.Ar switch .
See
.Sx SWITCH CONFIGURATION
in
.Xr vm.conf 5
for more information.
.El
.It Cm status Op Ar id
Lists VMs running on the host, optionally listing just the selected VM
.Ar id .
.It Cm stop Ar id
Stops (terminates) a VM defined by the specified VM
.Ar id .
.El
.Pp
If the
.Fl i
option is specified during VM startup, a corresponding number
of host-side
.Xr tap 4
interfaces will be allocated and mapped to the
.Xr vio 4
interfaces inside the guest VM.
This tap/vio interface mapping
allows guest network traffic to be manipulated by the host.
Any valid host-side interface configuration may be performed on these
tap interfaces, such as bridging (via
.Xr bridge 4 ) ,
or using
.Xr pf 4
nat-to rules to create private or host-side NATed networks, as desired.
.Sh FILES
.Bl -tag -width "/etc/var/run/vmd.sockXX" -compact
.It Pa /etc/vm.conf
Default configuration file.
.It Pa /var/run/vmd.sock
.Ux Ns -domain
socket used for communication with
.Xr vmd 8 .
.El
.Sh EXIT STATUS
.Ex -std vmctl
.Nm
may fail due to one of the following reasons:
.Pp
.Bl -bullet -compact
.It
The VMM subsystem could not be enabled or disabled as requested.
.It
A requested VM-based operation could not be completed.
.El
.Sh EXAMPLES
Create a 4.5 Gigabyte disk image, disk.img:
.Bd -literal -offset indent
$ vmctl create disk.img -s 4.5G
.Ed
.Pp
Create a new VM with 1GB memory, one network interface, one disk image
('disk.img') and boot from kernel '/bsd':
.Bd -literal -offset indent
# vmctl start "myvm" -m 1G -i 1 -d disk.img -k /bsd
.Ed
.Pp
.Xr vmd 8
will create a new
.Xr tap 4
network interface on the host side and set the description to indicate
the VM by ID, interface number, and name:
.Bd -literal -offset indent
# ifconfig tap0
tap0: flags=8842<BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	lladdr fe:e1:ba:d8:50:d1
	description: vm1-if0-myvm
	index 15 priority 0 llprio 3
	groups: tap
	status: active
.Ed
.Pp
Terminate VM number 1:
.Bd -literal -offset indent
# vmctl stop 1
.Ed
.Sh SEE ALSO
.Xr bridge 4 ,
.Xr pf 4 ,
.Xr tap 4 ,
.Xr vio 4 ,
.Xr vmm 4 ,
.Xr vm.conf 5 ,
.Xr rc.conf 8 ,
.Xr vmd 8
.Sh HISTORY
The
.Nm
command first appeared in
.Ox 5.9 .
.Sh AUTHORS
.An -nosplit
.An Mike Larkin Aq Mt mlarkin@openbsd.org
and
.An Reyk Floeter Aq Mt reyk@openbsd.org .