Note: Article about Proxmox VE 2.0 beta

Introduction

Proxmox VE High Availability Cluster (Proxmox VE HA Cluster) enables the definition of high available virtual machines. In simple words, if a virtual machine (VM) is configured as HA and the physical host fails, the VM is automatically restarted on one of the remaining Proxmox VE Cluster nodes.

The Proxmox VE HA Cluster is based on proofed Linux HA technologies, providing stable and reliable HA service.

System requirements

If you run HA, only high end server hardware with no single point of failure should be used. This includes redundant disks (Hardware Raid), redundant power supply, UPS systems, network bonding.

Fully configured Proxmox_VE_2.0_Cluster, with at least 3 nodes (maximum supported configuration: currently 16 nodes per cluster)
Shared storage (SAN for Virtual Disk Image Store for HA KVM)
Reliable network, suitable configured
NFS for Containers
Fencing device(s) - reliable and TESTED!

HA Configuration

The configuration of fence devices is CLI only. Adding and managing VM´s and containers for HA should be done via GUI.

Fencing is a needed part for Proxmox VE 2.0 HA, without fencing, HA will not start working.

Fencing

Configure VM´s and Containers for HA

Review again if you have everything you need and if all systems are running reliable. It makes no sense to configure HA cluster setup on unreliable hardware.