"One machine isn't enough anymore"
Your Proxmox server is running seven containers and two VMs. The CPU is at 90%, RAM is nearly full, and adding more services means degrading the ones already running.
Time for a cluster — multiple physical machines working together as one. With Proxmox clustering you can:
- Spread the load across multiple servers
- Migrate services from one machine to another (even live, without downtime)
- Add capacity gradually — buy a second machine when you need it, a third later
Work in Progress
This section will introduce clustering concepts and when it makes sense to scale from one server to multiple.
Guide reference
For step-by-step clustering instructions, see Guide — Clustering.