I Upgraded My Servers From a Bus Ride: Proxmox 7 to 9 Went Smoothly
Every infrastructure admin has a task they dread in private, and for a lot of them it's the big system upgrades that jump across multiple versions, the kind that could break networking, destroy configurations, or leave servers stuck in a half-updated state.
That fear is exactly why one Proxmox user spent years postponing a major upgrade. Their cluster had been running Proxmox 7 for a long time, and while everything still worked, the system was slowly becoming outdated. New container templates weren’t available anymore, and even something as basic as Ubuntu templates had fallen behind.
Eventually the pressure became too strong to ignore, so they did something unexpected: they started the upgrade while traveling on a bus. To their surprise, the entire process turned out to be far easier than they imagined.
The fear that comes with major infrastructure upgrades
Anyone who runs virtualization infrastructure knows this feeling. Upgrading a hypervisor platform isn’t like updating a normal desktop application. The hypervisor is the foundation for everything else, and virtual machines, containers, networking, and storage all depend on that base layer. If something goes wrong, the consequences can ripple across an entire environment.
That’s why many administrators delay upgrades as long as possible. When everything works, touching the system feels risky.
The user who shared this story admitted they had been putting off the upgrade for exactly that reason. Major upgrades often come with the possibility of failure, and rebuilding an entire environment from scratch sometimes feels safer than upgrading in place.
Delaying upgrades creates its own problems, though. Over time, older systems lose compatibility with new software, and eventually the upgrade becomes unavoidable.
Starting with the least important node
Instead of diving straight into the main infrastructure, the user took a cautious approach and began with the least important node in their cluster.
That decision is a classic infrastructure strategy. If something breaks during the upgrade, the damage is limited and critical workloads remain untouched. Even better, the first upgrade becomes a test run, and once the process works on one machine, the same steps can be repeated on the others.
The strategy was sensible; the timing was the surprising part. The upgrade happened remotely, during a bus ride, while the user carefully checked each step along the way. Despite the unusual setting, the process finished successfully within a few hours.
The moment when the fear disappears
The first successful upgrade changed everything. Once the initial node finished updating, the rest of the cluster suddenly looked much less intimidating. It was the same commands, the same upgrade steps, and the same checks along the way, so what had felt like a risky experiment became a repeatable process.
The other nodes were upgraded one by one using the same method. By the end, a cluster that had been stuck on Proxmox 7 for years was fully running on version 9, and faster than the user expected.
The biggest surprise was the reliability of the upgrade process itself, more than any of the new features.
Why Proxmox upgrades work so well
Several experienced users in the discussion pointed out one reason for this smooth experience: Proxmox is built on Debian, and Debian has a long history of reliable in-place upgrades.
One commenter mentioned they had been performing Debian distribution upgrades for two decades without encountering major problems. That foundation makes Proxmox upgrades far easier than they might be otherwise.
In practical terms, the underlying Debian system usually upgrades first, and then the Proxmox packages update on top of it. Because the system relies heavily on standard Linux package management tools, the process can often be handled with traditional upgrade commands rather than full reinstallations.
That design choice pays off, and it's one of the reasons Proxmox has built a reputation for stable upgrade paths.
Some users have been upgrading for over a decade
One of the most striking comments came from a long-time Proxmox user whose system had been upgraded continuously from Proxmox version 3 all the way to version 9 without major issues.
That kind of upgrade history is rare in many software platforms. It means the system evolved through multiple operating system changes, kernel updates, and platform improvements, all without requiring a full rebuild.
For infrastructure administrators, that continuity is incredibly useful. It allows systems to evolve gradually rather than being replaced every few years, and it reduces the amount of migration work required when new versions appear.
Not every upgrade is perfect
Of course, not every experience was completely smooth. Some users reported strange issues during upgrades, especially when jumping between specific versions.
One person explained that their upgrade from version 7 to 8 worked well, but the transition from 8 to 9 produced unexpected errors. In the end, they decided to reinstall the system and restore container backups instead. Another user described breaking a node during an upgrade from version 5 to 9 before eventually fixing it with help from community forums.
These stories are a reminder that even well-designed upgrade systems can run into trouble if configurations are unusual or if extra packages have been installed on the host system. That’s why careful preparation matters.
The discipline behind successful upgrades
Several experienced administrators shared a common rule for successful upgrades: follow the documentation exactly. The Proxmox upgrade guides are known for being extremely detailed, and skipping steps or ignoring warnings is often what causes problems.
One commenter explained it clearly: double-check every command, review every output message, and confirm each step before moving on. It’s not glamorous work, but that patient, careful approach dramatically reduces the chances of failure.
What the story actually teaches
At first glance, the story sounds almost reckless. Upgrading production infrastructure from a bus ride doesn’t exactly scream “best practices.”
Underneath, it's a story about confidence. The user spent years fearing a process that ultimately turned out to be routine. Once they actually started the upgrade, they discovered that the tools and documentation were strong enough to guide them safely through the process, and that realization changed how they viewed future upgrades.
Sometimes the biggest obstacle in infrastructure is the hesitation that builds up while waiting for the perfect moment to start, more than the technology itself. And occasionally, that moment happens while you're traveling down the highway with a laptop open and a hypervisor upgrading in the background.