Migrating from Proxmox to Incus: The Ultra-Lightweight, Kernel-Level Container Management Solution for Enterprises

Introduction: The Changing Landscape of Enterprise Virtualization

For years, Proxmox Virtual Environment (PVE) has been the go-to open-source platform for enterprise virtualization. Combining Type-1 hypervisor capabilities (KVM) with Linux Containers (LXC), Proxmox provided a robust, web-managed alternative to proprietary solutions. However, as infrastructure demands shift toward efficiency, speed, and cloud-native alignment, a growing number of system architects are re-evaluating their hypervisor overhead.

Enter Incus—the powerful, community-driven fork of LXD created under the Linux Containers project. While Proxmox offers a comprehensive, feature-rich management suite, it also introduces a heavy footprint. For organizations primarily focused on high-density containerization and streamlined Virtual Machine (VM) orchestration, Incus presents an ultra-lightweight, kernel-level alternative. This article explores the architectural benefits of replacing Proxmox with Incus, detailing why this migration can significantly optimize your infrastructure's performance and scalability.

Understanding Incus: The Next Evolution of LXD

To understand Incus, one must first understand its lineage. When Canonical shifted the licensing and governance model of LXD, the original maintainers and community stepped away to form Incus under the neutral umbrella of the Linux Containers project (the same team behind LXC). Incus is not a complete rewrite; rather, it is a refined, production-grade modernization of LXD.

Incus serves as a system container and virtual machine manager. Unlike application containers (such as Docker or Kubernetes pods), system containers behave like full Linux operating systems. They run an init system (like systemd), support SSH, cron jobs, and logging, but they do so without the emulation overhead of a traditional hypervisor. Incus leverages the host's Linux kernel directly, offering unparalleled efficiency.

Architectural Deep Dive: Proxmox vs. Incus

While both platforms can manage VMs and LXC containers, their underlying philosophies and architectures diverge significantly. Understanding these differences is crucial for determining which tool fits your operational model.

1. Resource Overhead and Footprint

Proxmox VE is bundled with a heavy Debian-based base system, a custom web graphical user interface (GUI), clustering daemons (Corosync), and a myriad of storage management tools. Even when idling, a Proxmox node consumes noticeable CPU and RAM cycles just to maintain its management stack.Incus, by contrast, is designed as a lightweight daemon (incusd) written in Go. It operates silently in the background, consuming minimal system resources. For edge computing environments, homelabs, or high-density server farms, Incus maximizes the compute resources available to actual workloads rather than the management layer.

2. The API-First Philosophy

Proxmox was built around its web interface. While it possesses a REST API, automation via tools like Terraform or Ansible can sometimes feel bolted-on. Incus reverses this paradigm by utilizing a strictly API-first architecture. Everything you can do via the Incus command-line interface (CLI) is executed via its secure, well-documented REST API. This makes Incus natively compatible with modern infrastructure-as-code (IaC) workflows.

Key Advantages of Migrating to Incus

Transitioning from Proxmox to Incus provides several distinct advantages for modern DevOps and system administration teams:

Kernel-Level Performance: Because Incus system containers share the host kernel, they achieve near-zero performance degradation. CPU, memory, and I/O operations execute at bare-metal speeds.
Seamless Mixed Workloads: Incus manages both system containers (LXC) and full virtual machines (via QEMU) seamlessly through the exact same CLI commands and API endpoints.
Advanced Clustering Without Complexity: Proxmox clustering requires strict corosync configuration and odd-numbered node counts for quorum. Incus features built-in, distributed database clustering via dqlite. Adding a node to an Incus cluster requires a single command, automatically distributing state across the cluster.
Flexible Network and Storage Abstractions: Incus features native integration with Open vSwitch, OVN (Open Virtual Network), BTRFS, ZFS, and Ceph. Creating isolated, multi-tenant networks or cross-node storage pools is incredibly straightforward.

When Should You Replace Proxmox with Incus?

Migration is not a one-size-fits-all decision. Organizations should consider replacing Proxmox with Incus if they meet the following criteria:

“If your infrastructure relies 80% or more on Linux workloads, traditional full-virtualization is costing you unnecessary hardware overhead. System containers are the answer.”

High Density Requirements: If you need to run hundreds of isolated Linux environments on limited hardware, Incus containers allow for much higher density than Proxmox VMs or even Proxmox LXC sub-systems.
DevOps and CI/CD Integration: If your team manages infrastructure via git repositories and automated pipelines, Incus’s lightweight nature allows it to be spun up, configured, and destroyed inside CI/CD runners instantly.
Preference for CLI and Automation: If your team prefers driving infrastructure through terminal commands, scripts, and configuration files rather than clicking through a heavy web UI.

Step-by-Step Migration Strategy

Moving from Proxmox to Incus requires deliberate planning, particularly when translating storage backends and networking layouts. Below is a high-level framework for executing the transition:

Step 1: Backup and Export Workloads

Before making any structural changes, ensure all Proxmox LXC containers and VMs are backed up. For LXC containers, you can extract the raw root filesystem archive (tar.zst) from your Proxmox backup storage. For VMs, you will need the raw .qcow2 or .raw disk images.

Step 2: Initialize the Incus Host

Install Incus on a clean Linux distribution (Debian, Ubuntu, or Rocky Linux are highly recommended). Once installed, initialize the system by running:

incus admin init

During initialization, you will define your storage pools (e.g., ZFS or BTRFS) and set up your network bridges.

Step 3: Import Containers and VMs

Incus provides a highly convenient tool called incus-migrate. This tool can connect to remote machines, analyze existing virtual machines or physical setups, and stream them directly into Incus instances over the network, converting them automatically.

For manual container imports, you can create a blank Incus container and replace its rootfs with the extracted tarball from your Proxmox backup, ensuring that the init system configurations match.

Conclusion: Embracing Minimalist Efficiency

Proxmox remains an excellent turnkey solution for traditional enterprise virtualization, especially for teams that require a comprehensive GUI out of the box. However, for organizations striving for maximum efficiency, cloud-native integration, and bare-metal speeds, Incus represents the ideal alternative.

By removing the bulky management layer and leveraging highly optimized kernel-level system containerization, Incus allows you to reclaim your hardware's true potential. Making the switch means choosing speed, automation, and modern architecture over legacy complexity.