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Preparing an unattended installation of OpenBSD:
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If the installation system detects that it booted from the network,
and isn't interrupted within 5 seconds, it attempts a fully-automatic
installation. In this mode the installer runs dhclient(8) on the
network interface the system booted from, and upon success retrieves
a response file via HTTP. The "next-server" DHCP option specifies the
hostname part of the URL, as in "http://<next-server>/install.conf".

You can also retrieve the response file from another source, a local
disk for example. If you wish to do that, enter the shell, retrieve
the response file, store it as /install.conf, and start the automatic
installation by leaving the shell and entering 'A' for "(A)utoinstall"
at the prompt.

The response file format is very simple. It contains key/value pairs
separated by an equals sign '=', where the key is a substring of the
question or the plural of a thing in multiple-choice questions, and
the value is what would have been entered at the interactive prompt.
Empty lines, and lines beginning with a '#' character are ignored.

Here is a minimal response file:

system hostname = openbsd
# generated with: encrypt -- secret
password for root = $2a$06$4Q.5e2eIJYyMn2J/HTR6N.gJ4tpBsSXgYrhVnxlomfhVGHOcnu3KW
location of sets = http

(Passwords should always be encrypted using encrypt(1), although the
installer also accepts cleartext passwords.)

The "system hostname" key above matches the following full question
asked during an interactive installation:

System hostname? (short form, e.g. 'foo')

Take "network interfaces" for an example of a multiple-choice question,
which could be asked during an interactive installation:

Available network interfaces: re0 re1
Which one do you wish to configure? [re0]

In a response file, this multiple-choice question is identified by
only the ``thing'' which is available: "network interfaces" in this
case. To configure these two interfaces the response file might
contain:

network interfaces = re0 re1
IPv4 address for re0 = dhcp
IPv4 address for re1 = dhcp

While the installation is in progress the installer will redirect all
output to the file /install.log, which can also be found on the freshly
installed system after the initial reboot. If the installation is
successful the system will reboot automatically; otherwise, you will
be dropped back into the shell where you can look at the /install.log
file or try again.