Migrating from Proxmox to Incus: The Ultra-Lightweight Kernel-Level Container and VM Management Solution

Introduction: The Evolution of Hypervisor and Container Orchestration

For years, Proxmox Virtual Environment (PVE) has been the undisputed heavyweight champion of open-source virtualization. By combining the power of Kernel-based Virtual Machines (KVM) with Linux Containers (LXC), Proxmox delivered a robust, web-UI-driven platform that served enterprise data centers and homelabs alike. However, as infrastructure demands shift toward raw efficiency, minimal overhead, and cloud-native alignment, a growing faction of systems engineers is looking for alternatives.

Enter Incus. Born as a community-driven fork of Canonical’s LXD, Incus represents a massive leap forward in ultra-lightweight, kernel-level management for both containers and virtual machines. Where Proxmox feels like a heavy, traditional operating system layer, Incus operates with surgical precision, offering a streamlined daemon that integrates directly with native Linux kernel features. This article provides an architectural deep dive into why replacing Proxmox with Incus could be the ultimate optimization strategy for your infrastructure.

Understanding Incus: The Successor to LXD

To understand Incus, one must understand its heritage. For years, LXD provided a container-production-ready extension on top of pure LXC, treating containers not just as application microservices (like Docker), but as full, system-level operating systems. Following changes in Canonical's licensing and project governance, the open-source community rallied under the Linux Containers umbrella to create Incus.

Incus is not merely a carbon copy of LXD. It has been stripped of telemetry, decoupled from Ubuntu-specific constraints, and heavily optimized for multi-node clustering, advanced networking, and security. It manages both system containers (LXC) and traditional virtual machines (via QEMU/KVM) through a unified, elegant command-line interface and a highly performant REST API.

Architectural Comparison: Proxmox vs. Incus

When evaluating the transition from Proxmox to Incus, understanding the architectural divergence is critical. While both utilize the same underlying Linux kernel technologies (KVM for VMs and LXC for containers), their management philosophies and resource footprints are radically different.

1. Resource Overhead and Kernel Integration

Proxmox runs a substantial stack of services, including corosync for clustering, pvedaemon, pveproxy, and a built-in web server. This ensures that even an idle Proxmox node consumes a noticeable baseline of RAM and CPU cycles.

Incus, conversely, operates as a singular, highly efficient daemon (incusd). It relies directly on the host's native kernel namespaces, cgroups, and storage subsystems without adding an intermediating management layer. This results in an ultra-lightweight environment where almost 100% of the hardware's compute power is allocated directly to the workloads, rather than the hypervisor itself.

2. The Philosophy of System Containers

While Proxmox treats LXC containers as secondary citizens compared to full VMs, Incus places them at the center of its universe. System containers in Incus look, feel, and operate exactly like virtual machines—they run full init systems (like systemd), accept SSH connections, and host complex applications—but they run at **near-native bare-metal speed** because they share the host kernel. This eliminates the emulation layer entirely, saving massive amounts of memory and disk I/O.

Key Advantages of Migrating to Incus

Switching to Incus provides several tangible benefits for modern business infrastructure, especially for development environments, edge computing, and high-density hosting.

• Unified Workload Management: With Incus, the command to launch a lightweight Debian container or a full Windows virtual machine is virtually identical. You use the exact same profile, storage, and networking abstractions for both.
• Declarative Configuration with Profiles: Incus uses "Profiles" to apply configuration templates (CPU limits, RAM allocations, network bridges, root disk sizes) to instances dynamically. Modifying a profile instantly updates all containers and VMs tied to it.
• First-Class Clustering: Setting up a cluster in Proxmox requires precise network configurations and corosync setups that can be brittle in low-bandwidth environments. Incus includes built-in clustering that scales from two nodes to dozens effortlessly using an integrated dqlite database.
• DevOps and CI/CD Synergy: Because Incus exposes a comprehensive, clean REST API, it integrates perfectly with modern infrastructure-as-code tools. Managing Incus via Terraform, OpenTofu, or Ansible is significantly cleaner and more reliable than navigating Proxmox’s API wrappers.

Step-by-Step Transition Strategy: Moving from Proxmox to Incus

Migrating production workloads requires a methodical approach. Because both platforms leverage LXC and QEMU, the underlying data structures are highly compatible. Here is an overview of the migration lifecycle:

Phase 1: Preparing the Incus Host

First, install a clean Linux distribution (such as Debian, Ubuntu, or Rocky Linux) on your target hardware. Install Incus and run the initialization wizard:

sudo incus admin init

During initialization, you will configure your storage pools (ZFS, BTRFS, or LVM) and set up your network bridges. For enterprise deployments, leveraging ZFS or Ceph is highly recommended to take advantage of instantaneous snapshots and clones.

Phase 2: Migrating Virtual Machines (KVM)

To move a VM from Proxmox to Incus, you must export the raw disk image from Proxmox's storage layer (usually found in /var/lib/vz/images/ or as a ZFS volume).

Phase 3: Migrating Containers (LXC)

Migrating LXC containers is even simpler. Because Incus can import raw root filesystems, you can backup your Proxmox container as a `.tar.gz` archive, transfer it to the Incus host, and import it directly into a new Incus container instance. The metadata will automatically adjust to Incus's streamlined configuration format.

Conclusion: Is Incus Right for Your Infrastructure?

Replacing Proxmox with Incus represents a shift from a traditional, GUI-centric hypervisor philosophy to a modern, **API-first, kernel-integrated infrastructure platform**. If your operations rely heavily on automated deployments, infrastructure-as-code, and you want to maximize hardware density via system containers without sacrificing the ability to run full VMs, Incus is an unmatched solution.

While Proxmox remains an excellent tool for teams that demand an all-in-one web console out of the box, Incus delivers the agility, speed, and simplicity required for the next generation of cloud and edge computing. It is light, fast, entirely open-source, and engineered for the future of Linux virtualization.