Proxmox offline version upgrade

Proxmox Virtual Environment is a complete, open-source server management platform for enterprise virtualization. It tightly integrates the KVM hypervisor and Linux Containers (LXC), software-defined storage and networking functionality, on a single platform.

Why Update Required?

Update is required mostly fix the bugs and get the latest features of any application.

Why Offline Update Required?

In a production environment no one will provide direct internet access to any hypervisor because it’s can be security breach. So offline update is required in a closed network.

How to update Proxmox in closed network?

Step01: mount your desire version of Proxmox ISO

Here i use a USB pen drive.

# lsblk -f
NAME    FSTYPE   FSVER LABEL UUID                   FSAVAIL FSUSE% MOUNTPOINTS
sdd     iso9660        PBS   2023-06-27-15-47-41-00              
└─sdd1  ntfs                 D2C2F2CDC2F2B4B7       3.7G    50% /media

# mount /dev/sdd1 /media/
# mkdir /iso
# mount /media/proxmox-ve_8.1-1.iso /iso -o loop

Step02: Add custom source list

Add below lines at the end of the sources.list file.

# nano /etc/apt/sources.list

##Proxmox Version update from 8.0 to 8.1
deb [trusted=yes] file:/iso/ bookworm pve
deb [trusted=yes] file:/iso/proxmox/packages/ /
deb [trusted=yes] file:/iso/ bookworm main

Step03: Check new source list and upgrade Proxmox version.

# apt list - upgradable
# apt upgrade

Finally shutdown all the guest OS and reboot the Proxmox hypervisor.

Note: In this guide i have update Proxmox version from 8.0 to 8.1

Hope this guide will help.