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'all-in-one-place' practical setup guideIn browser go to https://opnsense.org/download/ and select "System architecture amd64", select "image type VGA" (imperative) and download software to you laptop.
At the moment of this guide writing the latest version was OPNsense-25.7-vga-amd64.img.bz2 with sligtly over 500MB size. Mac and Linux user can unarchive downloaded file natively, in Windows use 7-zip or similar. Unarchived file OPNsense-25.7-vga-amd64.img weight 2.61GB and used to make bootable USB flash drive for opnSense installation.
Step 2. Make bootable USB flash drive for opnSense installation.
In Windows use Rufus (or similar) to make it. You will need to select only two parameters: Device - the USB drive (plugged into your laptop) and Boot Selection - the source file (downloaded and unarchieved OPNsense-25.7-vga-amd64.img); the rest of parameters are set by Rufus automatically:
Once selected, hit start, wait till process to complete, safely unplug the USB drive from your laptop and plug into any USB port of the Mini-PC.
In Mac/Linux use dd command in terminal to make it.
Linux:
- Identify the USB device name: in terminal, run dmesg or lsblk; name e.g., /dev/sda or /dev/sdb
- Write the image using dd: sudo dd if=OPNsense-25.7-vga-amd64.img of=/dev/sdX bs=16k (if dev/sda is the USB)
- Wait for completion, safely eject the USB drive from your laptop and plug into any USB port of the Mini-PC.
Mac:
- Identify the USB device name: in terminal, run diskutil list; name e.g., /dev/disk4
- Write the image using dd in terminal: sudo dd if=OPNsense-25.7-vga-amd64.img of=/dev/rdiskX bs=64k (if dev/disk4 is the USB)
- Wait for completion, safely eject (in terminal diskutil eject /dev/disk4 ) the USB drive from your laptop and plug into any USB port of the Mini-PC.
Note: find additional information about preparing USB bootable drive in official opnSense Initial Installation & Configuration guide
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