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# Auto-install OpenBSD on QEMU
This repository hosts a POSIX shell script to auto-install OpenBSD/amd64 6.6 to
copy-on-write disk image using QEMU. The script is intended to run on Linux. If
you already have a running OpenBSD installation, you should consider to use
OpenBSD's own hypervisor [vmm(4)](https://man.openbsd.org/vmm) instead of QEMU
as described in the [OpenBSD FAQ](https://www.openbsd.org/faq/faq16.html) and
in this [blog post](https://eradman.com/posts/autoinstall-openbsd.html).
The script will:
* Download and verify the official installation image and file sets.
* Create and serve a TFTP boot environment.
* Create an [autoinstall(8)](https://man.openbsd.org/autoinstall) configuration file including your public ssh key.
* Create and boot a copy-on-write disk image.
## Prerequisites
The script depends on the following tools:
* [QEMU](https://www.qemu.org/)
* [curl](https://curl.haxx.se/)
* Portable [signify](https://github.com/aperezdc/signify)
* [rsync](https://rsync.samba.org/)
* Portable [OpenSSH](https://www.openssh.com/portable.html)
* [socat](http://www.dest-unreach.org/socat/)
The following command installs these dependencies on Arch Linux:
sudo pacman -S qemu curl signify rsync openssh socat
## Usage
Execute the following command to auto-install OpenBSD/amd64 6.6 to a new disk
image `disk.qcow2` in the current directory.
./run
When prompted, run the following command to serve `./mirror/` at
http://127.0.0.1:8080/:
python -m http.server --directory ./mirror --bind 127.0.0.1 8080
You can override the following environment variable defaults if necessary:
* `DISK_FILE=disk.qcow2`
* `DISK_SIZE=160G`
* `CPU_COUNT=6`
* `MEMORY_SIZE=4G`
For example:
CPU_COUNT=1 ./run
## Virtual network
The script creates a virtual network, `10.0.2.0/24`, with the following
addresses:
* Host at `10.0.2.2`
* Nameserver at `10.0.2.3`
* Guest at `10.0.2.15`
The script also redirects host host port `2222` to guest port `22` (ssh) and
host port `80` (actually `10.0.2.1` port `80`) to host port `8080`.
## Secure shell
Pass the following options to ssh or scp to connect to the guest machine:
ssh \
-o "StrictHostKeyChecking no" \
-o "UserKnownHostsFile /dev/null" \
-o "Port 2222" \
puffy@127.0.0.1
For example, the following command forwards port `3000` on the host to port
`80` on the guest:
ssh \
-o "StrictHostKeyChecking no" \
-o "UserKnownHostsFile /dev/null" \
-o "Port 2222" \
-N \
-L 127.0.0.1:3000:127.0.0.1:80 \
puffy@127.0.0.1
Press `C-a x` to stop the guest machine.
Press `C-a h` to show other options.
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