Proxmox 9 Upgrade Guide: Step-by-Step (Without Breaking Things)

This step-by-step Proxmox 9 upgrade guide covers the complete walkthrough, pre-upgrade checklists, and how to avoid breaking changes during the transition to Proxmox VE 9. While a fresh installation of a hypervisor OS is ideal, it usually only happens when hardware is being retired. For most production labs and enterprise deployments, an existing environment must be upgraded. Because a major version jump from Proxmox VE 8 to Proxmox VE 9 must be executed via the command line (CLI), missing a critical step can cause major downtime. In this step-by-step Proxmox VE tutorial, we cover 🔹 The Complete PVE 8 to 9 Upgrade: The exact command-line process to safely migrate your cluster. 🔹 Admin Beware (KSM Security Risk): Why the new default Kernel Samepage Merging settings might expose your production network segments. 🔹 The 100% RAM Mystery: Why your VM summary bars suddenly look completely full after the upgrade, and how to fix it 📖 RESOURCES & COMMANDS Find all the commands and a detailed walkthrough on the blog: 👉 https://www.techtutorials.tv/sections... 🚀 SUPPORT THE CHANNEL If you find this tutorial helpful, consider supporting the work: ☕ Buy Me a Coffee: https://buymeacoffee.com/dmckone 💙 PayPal: https://paypal.me/DavidMcKone 📺 YouTube Memberships:    / techtutorialsdavidmckone   🎗 Patreon:   / dmckone   YouTube and Patreon Lab members get to see videos in advance and unpolished footage long before the final cut is released! ⚙️ MY GEAR The links below are affiliate links and help support the channel at no extra cost to yourself Blue Yeti USB Microphone https://amzn.to/3IfL3qm Blue Radius III Custom Shockmount for Yeti and Yeti Pro USB Microphones https://amzn.to/3G3f89P RØDE PSA1 Professional Studio Arm https://amzn.to/3Z3lPBF Aokeo Professional Microphone Pop Filter https://amzn.to/3VuZl9H Sony Alpha ZV-E10L Mirrorless Camera https://amzn.to/3ITHCoU Elgato Cam Link 4K Capture Card https://amzn.to/43CzQaT Neewer NP-FW50 Dummy Battery Charger Kit https://amzn.to/3qp9Q4s Elgato Key Light Air - Professional 1400 lumens Desk Light https://amzn.to/3G81OB9 Neewer 2 Packs Tabletop LED Video Light Kit https://amzn.to/3CcuN5O Elgato Green Screen https://amzn.to/3CoJBOL 📱 CONNECT WITH ME Website - https://www.techtutorials.tv/ Twitter -   / dsmckone1   📍 CHAPTERS 00:00 Intro 00:52 Update Proxmox VE 11:59 Intel Microcode 14:04 Bootloader for BIOS computers 16:54 Bootloader for UEFI computers 20:06 Removable Bootloader 20:59 Final Precheck 22:02 Deb822 Style 24:40 Interface Names 27:07 Upgrade Proxmox VE 41:16 Post Update 48:59 Cluster Upgrade 51:56 Replication 53:10 HA Rules 55:53 MTU Setting 57:41 Admin Beware! Proxmox 9 KSM,Proxmox 9 RAM usage 100%,Proxmox VE 8 to 9 upgrade guide,ksmtuned disable proxmox,upgrade proxmox 8,proxmox upgrade,upgrade pve 8 #proxmox #upgrade