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VMD(8) System Manager's Manual VMD(8)

vmdvirtual machine daemon

vmd [-dnv] [-D macro=value] [-f file]

vmd is a daemon responsible for the execution of virtual machines (VMs) on a host. vmd is typically started at boot time and is controlled via vmctl(8).

vmd can be enabled during system boot by setting the following in /etc/rc.conf.local:


vmd interfaces with the virtual machine monitor (VMM) built into the kernel. One instance of vmd will be spawned for each VM running on the host, plus extra instances for control operations. Each child vmd will in turn create one or more VCPU (virtual CPU) threads responsible for driving the VM's operations using vmm(4).

vmd is also responsible for proxying various other commands/requests from vmctl(8), such as stopping VMs, and retrieving information from vmm(4) about running VMs.

The options are as follows:

Define macro to be set to value on the command line. Overrides the definition of macro in the configuration file.
Do not daemonize and log to .
Specify an alternative configuration file. The default is /etc/vm.conf.
Configtest mode. Only check the configuration file for validity.
Verbose mode. Multiple -v options increase the verbosity.

Default BIOS boot image. The BIOS is an external firmware file that is distributed separately due to an incompatible license. A prepackaged version of the firmware can be installed using fw_update(1).
Default configuration file. This is optional.
UNIX-domain socket used for communication with vmctl(8).

vmm(4), vm.conf(5), rc.conf(8), vmctl(8)

The vmd command first appeared in OpenBSD 5.9.

Mike Larkin <> and
Reyk Floeter <>

July 19, 2017 OpenBSD-6.3