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  🏎️ A High-Speed Highway for Seamless Service, Dedicated Migration Network The most common bottleneck when running a Proxmox VE cluster and performing Live Migration is the network. The process of transferring dozens of gigabytes of memory data all at once can collide with existing service traffic, causing service latency or even migration failure. In this #lecture , we will take an in-depth look at the 'Migration Network Isolation' strategy, which can maximize cluster stability and revolutionarily increase transfer speeds. Optimize your infrastructure to the next level through this successful #method . 1. Decisive Reasons Why Network Isolation is Necessary Why should we build a dedicated line for migration separately from the management or service networks? A. Blocking Interference with Service Traffic Live Migration tends to occupy all available network bandwidth. If this bandwidth is shared with the service network used by users, it can cause the service to slow down or te...

  ❄️ The Most Reliable and Secure Transfer: Everything About Cold Migration If 'Live Migration' in Proxmox VE is the pinnacle of flashy technology, 'Cold Migration' is a classic technique that boasts powerful stability. This #method , which moves resources between nodes while the Virtual Machine (VM) or Container (CT) is completely stopped, minimizes variables imposed on the system. Sometimes, a heavy and certain orthodox approach is needed more than a flashy technique. In this #lecture , we will take an in-depth look at why you should choose Cold Migration even if it means service interruption, and the internal working process behind it. 1. Definition and Core Principles of Cold Migration Cold Migration, as the name suggests, is a technology that moves resources in a 'cold' state—that is, when the power is turned off. A. Stateless Migration Unlike Live Migration, which copies running memory data in real-time, Cold Migration ignores the memory state. Since the p...

  🔄 The Magic of Non-Stop Servers: An In-depth Analysis of Live Migration In the previous session, we learned about the essential prerequisites for Live Migration: clusters and shared storage. In this #lecture , we will delve into the magic that happens inside the system when you actually click the migration button. The reason a Virtual Machine (VM) can cross physical server boundaries without stopping is due to the sophisticated 'Memory Copy' technology. Let's understand the core #method of moving data without affecting running services, step by step. 1. Core Technology of Live Migration: Iterative Memory Copy The reason Live Migration feels 'seamless' is that it synchronizes memory data in real-time. A. Pre-copy Phase When migration starts, the system begins transferring the entire memory #data of the VM from the source node to the target node. During this time, the VM continues to provide services and modify its memory contents. Memory pages changed during the...

  🔑 The Foundation of Cluster Security, SSH Key Exchange A Proxmox VE cluster operates through constant interaction between its nodes. All cluster operations, such as VM migration, configuration synchronization, and High Availability (HA) functions, are fundamentally based on secure communication between nodes. One of the most critical security mechanisms in this process is SSH Key Exchange. In this #lecture , we will take an in-depth look at what SSH Key Exchange is in a Proxmox cluster environment, why it is necessary, and how to configure and manage it. 1. What is SSH Key Exchange? The Core of Cluster Security SSH Key Exchange provides a #method for secure communication between nodes without the need for passwords. A. Secure Passwordless Access Traditional password authentication can be vulnerable to brute-force attacks. SSH Key Exchange uses a pair of Public and Private Keys, providing robust #security where no one can access the server without the private key. B. Automated ...

  ⚠️ The Final Gateway of Cluster Management: The Art of Node Removal Operating a Proxmox cluster inevitably leads to situations where a specific node must be separated—whether for hardware replacement, node upgrades, or fixing misconfigurations. Simply turning off the power is not enough; the cluster will perceive the node as being in a 'failed state,' which can trigger quorum issues or HA malfunctions. In this #lecture , we provide a complete guide to the process of safely removing a node without compromising the integrity of the existing cluster and re-joining it if necessary. 1. Essential Pre-Removal Checklist The process of removing a node carries a risk of data loss, so thorough preparation is required. A. Moving Virtual Machines (VM) and Containers (CT) All services running on the node to be removed must be 'Live Migrated' to other active nodes. If the node is already failed, you must choose a #method to recover them on another node using backups. B. Verifying Q...

  🛡️ The Core of Non-Stop Clustering: Corosync Link Redundancy We have learned about Corosync communication—the brain and heart of a Proxmox cluster—and the importance of Quorum in determining the cluster's survival. Now, it’s time to learn how to make this critical communication channel even more powerful and stable. Network failures can happen at any time, and a cluster that relies on a single communication path is inevitably exposed to fatal risks. In this #lecture , we will dive into the concept of 'Corosync Link Redundancy' to maximize the stability of your Proxmox cluster and the specific #method of configuring Ring0 and Ring1. 1. The Necessity of Corosync Link Redundancy: Eliminating SPOF High Availability (HA) loses its meaning if the entire cluster stops due to a single network cable issue. A. Eliminating SPOF (Single Point of Failure) Every node in the cluster exchanges status updates via Corosync. If there is only one communication path, a problem with that pat...

  🗳️ Democracy in the Cluster: What is Quorum? In the previous lecture, we learned about Corosync, the way nodes talk to each other. However, simply talking isn't enough. When a network failure disconnects nodes, the system must decide which nodes have the "true" authority to manage the cluster. In this #lecture, we will dig deep into the concept of 'Quorum,' the most critical survival principle of a cluster, and the technical reasons why you must configure your infrastructure with an odd number of nodes. 1. Definition and Working Principle of Quorum Quorum refers to the 'minimum number of votes' required for the cluster to make legitimate decisions. A. The Principle of Majority Rule A Proxmox cluster grants a 'vote' to each node. Only when more than half of the total votes ($n/2 + 1$) are secured does the cluster enter a 'Quorate' state. Only in this state are #methods such as turning on virtual machines or changing settings permitted. B....

  📡 The Heartbeat of the Cluster: Unveiling Corosync In the previous session, we practiced the cluster joining process that binds multiple nodes into one. On the surface, it looks like the nodes are simply connected, but behind the scenes, they are constantly conversing to confirm each other's "living" status. The core of this invisible dialogue is 'Corosync.' In this #lecture , we will take a deep dive into the principles and importance of the Corosync communication protocol, which acts as both the heartbeat and the brain of a Proxmox cluster. 1. What is Corosync? Understanding the Cluster Mechanism Corosync is an open-source communication engine that allows nodes within a cluster to share their status in real-time. A. Membership and Quorum Maintenance Corosync's primary mission is to determine which nodes are currently online (membership) within the cluster. Through voting between nodes, it forms a 'Quorum,' proving that more than half of the nodes ...

  🤝 Two are Stronger Than One: Completing the Cluster In the previous lecture, we laid the foundation of a massive infrastructure called a cluster. Now, it is time to raise the pillars upon it. The moment individual servers are bound into a single cluster, true resource sharing and non-disruptive service become possible. In this #lecture , we will dive deep into the practical #method of safely and quickly joining a second node, and more, to the cluster we created on the first node. 1. Prerequisites Before Joining a Node Joining a cluster is not just about connecting servers; it is a sensitive operation that synchronizes configuration files and permissions. Inadequate preparation can lead to communication errors or tangled settings during the joining process. A. Emptying Virtual Resources The new node intended for joining must not have any existing virtual machines (VMs) or containers. If there are existing #resource s in operation, you must back them up and delete them, then rest...