Proxmox: When to Choose LXC Containers Over VMs in Your Homelab

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A practical comparison on the Proxmox virtualization platform examines when LXC containers offer meaningful advantages over full KVM virtual machines. Benchmarks show LXC containers consume significantly less RAM at idle — around 1.2 GB on a 64 GB host versus roughly 300 MB per individual VM — and deliver nearly double the storage IOPS on NVMe drives due to the absence of a VirtIO overhead layer. However, LXC containers share the host kernel, meaning a successful kernel exploit such as Dirty Pipe (CVE-2022-0847) can compromise the entire host, whereas KVM would confine the breach to a single VM. Security-hardening measures like unprivileged containers and AppArmor profiles can reduce LXC risks, but multi-tenant or untrusted workloads are still recommended to run inside full VMs. The guidance concludes that LXC is well-suited for stateless services and internal microservices, while workloads requiring hardware access, root-level operations, or strict isolation should default to KVM.

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