Installing OpenBSD without internet access can seem daunting, especially for users who rely on network-based package fetching and updates during setup. This guide covers essential steps and considerations for successfully installing OpenBSD on systems with no internet connection, whether due to security policies, remote environments, or offline setups. It is aimed at system administrators, security professionals, and enthusiasts who want a reliable, secure OpenBSD installation without network dependencies.
Prepare Installation Media
The first step in an offline OpenBSD installation is preparing reliable installation media. Download an OpenBSD install ISO image (for example, from a trusted machine with internet) and burn it to a USB stick or DVD. This media contains the base system and necessary tools for installation, ensuring you have all files locally without needing a network connection during setup.
Download and Include Packages Manually
Since the internet is unavailable during installation, you need to manually download any additional OpenBSD packages you want to install. From another machine with internet access, download packages from the official OpenBSD mirrors (e.g., http://ftp.openbsd.org/pub/OpenBSD/). Transfer these packages to your target system via USB or other removable media to install them later offline.
Use the “bsd.rd” Ramdisk Kernel for Installation
OpenBSD’s “bsd.rd” is a ramdisk kernel designed for installation and recovery. Booting from this kernel allows you to run the installer entirely from RAM without network requirements. It provides a minimal environment to partition disks, extract sets, and configure the base system offline.
Pre-Download OpenBSD Sets
OpenBSD installs from sets—compressed tar archives containing the base system, X Window System, and other components. For an offline install, download these sets in advance (e.g., baseXX.tgz, compXX.tgz, etc.) from an official mirror. Copy them to your install media or USB drive to extract during installation, ensuring a full system install without needing network access.
Partition and Format Disks Manually
The OpenBSD installer allows manual disk partitioning through the “disklabel” utility. Without internet, you must carefully configure partitions (e.g., root, swap, /home) during installation. This manual step is crucial for offline setups to ensure proper disk layout without assistance from online tools or defaults.
Configure Network Interfaces Offline
Even if you won’t use the network during installation, configuring network interfaces can be done manually later by editing /etc/hostname.if files. For offline usage, you can leave these interfaces unconfigured or set static IPs if local networking is available. This approach avoids the need for DHCP or internet connectivity during setup.
Set Up User Accounts and Passwords Locally
During installation, you create root and user accounts with passwords directly on the machine. This step does not require internet and is essential for securing your offline OpenBSD system. Make sure to choose strong passwords and configure user privileges as needed.
Install Additional Software via Local Packages
Once the base system is installed, you can install additional software from the pre-downloaded packages using the “pkg_add” command with the “-D unsigned” flag if needed. This local installation method bypasses the need for an online package repository, allowing you to extend functionality offline.
Configure System Services and daemons Manually
OpenBSD’s service management uses rc scripts located in /etc/rc.d and configuration files in /etc. After installation, configure services like sshd, ntpd, or pf manually to suit your offline environment. Disabling unnecessary services is also important for security in air-gapped or isolated systems.
Create Local Documentation and Recovery Plans
Without internet, access to the official OpenBSD FAQ and man pages online isn’t available. Ensure you have local copies of documentation by installing the “man” and “xbase” sets and consider creating offline backups of important manuals. Planning recovery methods such as bootable rescue media is critical for maintaining your offline OpenBSD system.
How to Choose
The key factors when performing an OpenBSD installation without internet include the completeness of your pre-downloaded installation media and packages, your familiarity with manual disk partitioning and system configuration, and your hardware compatibility. Prioritize obtaining all necessary sets and packages beforehand and verify your installation media integrity. Also, consider how much additional software you require offline, as this affects package preparation. The goal is to ensure a smooth installation and system usability without network dependency, so preparation and local resource availability matter most.
Frequently Asked Questions
Q: Can I install OpenBSD completely offline without any network setup?
Yes, OpenBSD’s installation media includes all base sets necessary for a full install. You just need to pre-download any extra packages you want and manually transfer them.
Q: How do I verify the integrity of OpenBSD installation files without internet?
Use the provided SHA256.sig signatures and verify them with signify(1) on a trusted machine before copying files to your offline environment.
Q: Is it possible to update OpenBSD later without internet?
Yes, you can manually download new sets or packages on another machine and transfer them to your system to apply updates offline.
Q: What if my hardware isn’t supported by OpenBSD’s default install sets?
Check hardware compatibility lists beforehand; unsupported hardware may require custom kernels or drivers, which are difficult to manage offline.
Q: Can I use USB drives to transfer packages and sets?
Absolutely. USB storage is the most common way to move installation files and packages to an offline OpenBSD system.
Q: How do I handle time synchronization without internet?
Without network access, you must set the system clock manually or synchronize via a local network time server if available.
Final Thoughts
Installing OpenBSD without internet access requires careful preparation of installation media, pre-downloading necessary sets and packages, and manual configuration steps during setup. While it removes convenience, it enhances security and control, making it ideal for sensitive or isolated environments. By following these concrete steps, you can build a stable, secure OpenBSD system fully offline and maintain it effectively without network dependencies.
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