We’ll be using OpenCore as a bootloader for Catalina. Building the offline installer requires you to have a Mac, here are the instructions. If you won’t have an Internet connection available to Catalina during installation, or your network can’t provide an IP address by DHCP you’ll need to build an offline installer instead. Upload the “ISO” to your Proxmox server’s ISO store (typically /var/lib/vz/template/iso). The result is actually a raw disk image, not a true ISO, but Proxmox has better tools for picking and re-using ISO images than disk images. Qemu-img convert BaseSystem.dmg -O raw Catalina-installer.iso # Or use qemu-img from the qemu-utils package to do it instead: Or like so if you’re building this on Linux: # Install the dmg2img package and.ĭmg2img BaseSystem.dmg Catalina-installer.iso
Convert that dmg into an “iso” like so if you’re building this on macOS: hdiutil convert BaseSystem.dmg -format UDRW -o Catalina-installer.iso This results in a ~500MB “BaseSystem.dmg” file in the current directory. Download and run fetch-macOS.py in a terminal to download the Catalina recovery image from the Apple software distribution server (this can be run on Linux, Proxmox, or on a Mac): The easiest installer to build is a recovery image, which will download Catalina during installation. Modern AMD CPUs also support SSE 4.2 and will work with this guide. Older CPUs will cause the finder to repeatedly crash after installation completes (with an Illegal Instruction exception in the graphics code). Your Proxmox host computer’s CPU must support SSE 4.2, so for Intel your CPU must be at least as new as Nehalem, which was the first CPU generation to bear the “Core” i5/i7 branding. You also need a real Mac available in order to fetch the OSK key. I’ll assume you already have Proxmox 6.1 or 6.2 installed. If you’d like to use Clover instead, use my older tutorial, but OpenCore works better! Requirements You can get the full sourcecode on my GitHub here. This tutorial for installing macOS Catalina using OpenCore has been adapted for Proxmox from Kholia’s OSX-KVM project and Leoyzen’s OpenCore configuration for KVM. MacOS 11 Big Sur has now been released! If you’d like that version instead then please use my new Big Sur installation guide!
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