NAME

vmctl — control the virtual machine daemon

SYNOPSIS

vmctl

command [arg ...]

DESCRIPTION

The vmctl 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.

Within the commands, the size argument can be specified with a human-readable scale, using the format described in scan_scaled(3). The id argument can be either a numeric, non-zero identifier or alternatively the name of a virtual machine.

The commands are as follows:

console id

Using cu(1) connect to the console of the VM with the specified id.

create path -s size

Creates a VM disk image file with the specified path and size, rounded to megabytes.

load filename

Load additional configuration from the specified file.

log brief

Disable verbose debug logging.

log verbose

Enable verbose debug logging.

pause id

Pause a VM with the specified id.

receive name

Receive a VM from standard input and start it with the specified name.

reload

Remove all stopped VMs and reload the configuration from the default configuration file.

reset [all]

Reset the running state.

reset switches

Reset the configured switches.

reset vms

Reset and terminate all VMs.

send id

Send a VM with the specified id to standard output and terminate it.

start name [-Lc] [-b path] [-d path] [-i count] [-m size] [-n switch]

Starts a VM defined by the specified name and parameters:


-b path: Boot the VM with the specified kernel or BIOS image. If not specified, the default is to boot using the BIOS image in /etc/firmware/vmm-bios.

-c: Automatically connect to the VM console.

-d path: Disk image file (may be specified multiple times to add multiple disk images).

-i count: Number of network interfaces to add to the VM.

-L: Add a local network interface. vmd(8) will auto-generate an IPv4 subnet for the interface, configure a gateway address on the VM host side, and run a simple DHCP (BOOTP) server for the VM.

-m size: Memory size of the VM, rounded to megabytes. The default is 512M.

-n switch: Add a network interface that is attached to the specified virtual switch. See SWITCH CONFIGURATION in vm.conf(5) for more information.

status [id]

Lists VMs running on the host, optionally listing just the selected VM id.

stop id

Stops (terminates) a VM defined by the specified VM id. A graceful shutdown will be attempted if the VM supports the vmmci(4) device. Once stopped, if the VM was not defined in a configuration file, then it is removed.

unpause id

Unpause (resume from a paused state) a VM with the specified id.

If the -i option is specified during VM startup, a corresponding number of host-side tap(4) interfaces will be allocated and mapped to the 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 bridge(4)), or using pf(4) nat-to rules to create private or host-side NATed networks, as desired.

FILES

/etc/vm.conf: Default configuration file.
/var/run/vmd.sock: UNIX-domain socket used for communication with vmd(8).

EXIT STATUS

The vmctl utility exits 0 on success, and >0 if an error occurs. vmctl may fail due to one of the following reasons:

The VMM subsystem could not be enabled or disabled as requested.
A requested VM-based operation could not be completed.

EXAMPLES

Create a 4.5 Gigabyte disk image, disk.img:

$ vmctl create disk.img -s 4.5G

Create a new VM with 1GB memory, one network interface, one disk image ('disk.img') and boot from kernel '/bsd':

# vmctl start "myvm" -m 1G -i 1 -b /bsd -d disk.img

vmd(8) will create a new tap(4) network interface on the host side and set the description to indicate the VM by ID, interface number, and name:

# 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

Terminate VM number 1:

# vmctl stop 1

HISTORY

The vmctl command first appeared in OpenBSD 5.9.

AUTHORS

Mike Larkin <mlarkin@openbsd.org> and Reyk Floeter <reyk@openbsd.org>.