Embodiments perform decentralized virtual machine (VM) migration decisions. By comparing a set of VM-specific rules with current statistics (e.g., resource usage), one host determines whether to migrate the VM and lazily selects another host to receive the VM. The rules define, for example, threshold values for resource usage. The host makes the migration decision and performs the migration without input from a centralized server. In this manner, migration decisions are offloaded to migration modules executing on each host for reactive and/or proactive migration. Proactive migration involves migrating a VM before the VM violates its rules.
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